TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4552
AB  - The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas.
AB  - Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration
T1  - Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju
EP  - 59
IS  - 1
SP  - 52
VL  - 61
DO  - 10.5937/zasmat2001052M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2020",
abstract = "The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas., Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration, Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju",
pages = "59-52",
number = "1",
volume = "61",
doi = "10.5937/zasmat2001052M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2020). The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 61(1), 52-59.
https://doi.org/10.5937/zasmat2001052M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D, Bajić D. The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala. 2020;61(1):52-59.
doi:10.5937/zasmat2001052M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration" in Zaštita materijala, 61, no. 1 (2020):52-59,
https://doi.org/10.5937/zasmat2001052M . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4107
AB  - Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Temperature fields in linear stage of friction stir welding effect of different material properties
EP  - 3992
IS  - 6
SP  - 3985
VL  - 23
DO  - 10.2298/TSCI181015264V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan and Mrdak, Mihailo and Sedmak, Aleksandar",
year = "2019",
abstract = "Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Temperature fields in linear stage of friction stir welding effect of different material properties",
pages = "3992-3985",
number = "6",
volume = "23",
doi = "10.2298/TSCI181015264V"
}

Veljić, D., Rakin, M., Međo, B., Mrdak, M.,& Sedmak, A.. (2019). Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(6), 3985-3992.
https://doi.org/10.2298/TSCI181015264V

Veljić D, Rakin M, Međo B, Mrdak M, Sedmak A. Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science. 2019;23(6):3985-3992.
doi:10.2298/TSCI181015264V .

Veljić, Darko, Rakin, Marko, Međo, Bojan, Mrdak, Mihailo, Sedmak, Aleksandar, "Temperature fields in linear stage of friction stir welding effect of different material properties" in Thermal Science, 23, no. 6 (2019):3985-3992,
https://doi.org/10.2298/TSCI181015264V . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Međo, Bojan
AU  - Veljić, Darko
AU  - Arsić, Miodrag
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4237
AB  - In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.
PB  - Walter de Gruyter Gmbh, Berlin
T2  - Reviews on Advanced Materials Science
T1  - The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating
EP  - 81
IS  - 1
SP  - 75
VL  - 58
DO  - 10.1515/rams-2019-0007
ER  - 

@article{
author = "Mrdak, Mihailo and Međo, Bojan and Veljić, Darko and Arsić, Miodrag and Rakin, Marko",
year = "2019",
abstract = "In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.",
publisher = "Walter de Gruyter Gmbh, Berlin",
journal = "Reviews on Advanced Materials Science",
title = "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating",
pages = "81-75",
number = "1",
volume = "58",
doi = "10.1515/rams-2019-0007"
}

Mrdak, M., Međo, B., Veljić, D., Arsić, M.,& Rakin, M.. (2019). The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science
Walter de Gruyter Gmbh, Berlin., 58(1), 75-81.
https://doi.org/10.1515/rams-2019-0007

Mrdak M, Međo B, Veljić D, Arsić M, Rakin M. The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science. 2019;58(1):75-81.
doi:10.1515/rams-2019-0007 .

Mrdak, Mihailo, Međo, Bojan, Veljić, Darko, Arsić, Miodrag, Rakin, Marko, "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating" in Reviews on Advanced Materials Science, 58, no. 1 (2019):75-81,
https://doi.org/10.1515/rams-2019-0007 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4273
AB  - Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given.
AB  - Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation
T1  - Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju
EP  - 341
IS  - 4
SP  - 336
VL  - 60
DO  - 10.5937/zasmat1904336M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given., Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation, Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju",
pages = "341-336",
number = "4",
volume = "60",
doi = "10.5937/zasmat1904336M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(4), 336-341.
https://doi.org/10.5937/zasmat1904336M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala. 2019;60(4):336-341.
doi:10.5937/zasmat1904336M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation" in Zaštita materijala, 60, no. 4 (2019):336-341,
https://doi.org/10.5937/zasmat1904336M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4275
AB  - This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants.
AB  - U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of plasma spray bioinert coating Al2O328wt.%MgO
T1  - Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO
EP  - 49
IS  - 1
SP  - 44
VL  - 60
DO  - 10.5937/zasmat1901044M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants., U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of plasma spray bioinert coating Al2O328wt.%MgO, Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO",
pages = "49-44",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901044M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 44-49.
https://doi.org/10.5937/zasmat1901044M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala. 2019;60(1):44-49.
doi:10.5937/zasmat1901044M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Characterization of plasma spray bioinert coating Al2O328wt.%MgO" in Zaštita materijala, 60, no. 1 (2019):44-49,
https://doi.org/10.5937/zasmat1901044M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4276
AB  - ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1).
AB  - ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system
T1  - Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl
EP  - 151
IS  - 2
SP  - 147
VL  - 60
DO  - 10.5937/zasmat1902147M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1)., ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system, Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl",
pages = "151-147",
number = "2",
volume = "60",
doi = "10.5937/zasmat1902147M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(2), 147-151.
https://doi.org/10.5937/zasmat1902147M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala. 2019;60(2):147-151.
doi:10.5937/zasmat1902147M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system" in Zaštita materijala, 60, no. 2 (2019):147-151,
https://doi.org/10.5937/zasmat1902147M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4277
AB  - Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion.
AB  - Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process
T1  - Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom
EP  - 276
IS  - 3
SP  - 271
VL  - 60
DO  - 10.5937/zasmat1903271M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion., Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process, Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom",
pages = "276-271",
number = "3",
volume = "60",
doi = "10.5937/zasmat1903271M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(3), 271-276.
https://doi.org/10.5937/zasmat1903271M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala. 2019;60(3):271-276.
doi:10.5937/zasmat1903271M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process" in Zaštita materijala, 60, no. 3 (2019):271-276,
https://doi.org/10.5937/zasmat1903271M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3821
AB  - Tantalum is a very popular material for the industry as a whole because of very important characteristics such as: high melting point, significant thermal and electrical conductivity, high toughness and resistance to corrosion and good biocompatibility. Since the tantalum metal is sensitive to O, N and H gases, tantalum coating layers are deposited only using the vacuum plasma spray process (VPS), which has, in the past few years been used successfully for preparing coatings which are widely used in the preparation of metal implants. The aim of this paper was to, at a low pressure inert gas eliminate the influence of the surrounding atmosphere on the melted Ta powder particles and produce coatings with mechanical and structural characteristics which will find application in biomedicine. For depositing the coating a commercial tantalum powder AMPERIT® 151065 grain size of 10 - 30 μm was used. The powder was deposited with a plasma F4 gun at a distance of substrates at 300 mm. The Ta coating layers were deposited with a thickness of 60 to 70 μm on steel substrates. As the plasma gas used was a mixture of Ar and He inert gases. The microhardness of the coating was tested using the HV0.3 method and the tensile strength of the coatings bond was tested by the tensile method in accordance with the ASTM C633-1 standard. The microstructure of the coating in deposited state and after etching was studied on an optical microscope (OM) and scanning electron microscope (SEM). Etching the coating was carried out in the reagent which consisted of two parts of nitric acid, two parts hydrofluoric acid, and five parts water (2HNO3: 2HF: 5H2O). The structure of the coating consists solely of a tough αTa phase with a body centered cubic lattice. Tests have shown that layers of VPS - Ta coatings have the microstructure and mechanical properties which completely support the use of the coating in the process of making implants.
AB  - Tantal je veoma atraktivan materijal za industriju u celini zbog veoma bitnih osobina kao što su: visoka temperatura topljenja, značajna toplotna i električna provodljivost, visoka žilavost i otpornost na koroziju i dobra biokompatibilnost. Pošto je tantal metal osetljiv na gasove O, N i H, slojevi prevlake tantala se isključivo deponuju vakuum plazma sprej procesom (VPS), koji se u poslednjih nekoliko godina uspešno koristi za izradu prevlaka koje imaju široku primenu u izradi metalnih implanata. Cilj rada bio je da se na niskom pritisku inertnog gasa eliminiše uticaj okolne atmosfere na istopljene čestice praha Ta i proizvedu prevlake mehaničkih i strukturnih karakteristika koje će naći primenu u biomedicini. Za deponovanje prevlake koristio se komercijalni prah tantala AMPERIT® 151.065 granulacije od 10 - 30µm. Prah je deponovan sa plazma pištoljem F4 na odstojanju podloge od 300 mm. Slojevi Ta prevlaka su deponovani sa debljinom od 60 do 70µm na čeličnim podlogama. Kao plazma gas koristila se mešavina inertnih gasova Ar i He. Mikrotvrdoća prevlake ispitana je metodom HV0.3 a zatezna čvrstoća spoja prevlake ispitana je metodom na zatezanje u skladu sa standardom ASTM C633-1. Mikrostruktura prevlake u deponovnom stanju i u stanju posle nagrizanja ispitana je na optičkom mikroskopu (OM) i na skening elektronskom mikroskopu (SEM). Nagrizanje prevlake sprovedeno je u reagensu koji se sastojao od dva dela azotne kiseline, dva dela fluorovodonične kiseline i pet delova vode (2HNO3 : 2HF : 5H2O). Struktura prevlake se isključivo sastoji od žilave α-Ta faze sa zapreminski centriranom kubnom rešetkom. Ispitivanja su pokazala da slojevi VPS - Ta prevlake imaju mikrostrukturu i mehaničke karakteristike koje u potpunosti omogućavaju primenu prevlake u procesu izrade implanata.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of tantalum coatings deposited using vacuum plasma spray process
T1  - Karakterizacija tantal prevlake deponovane vakuum plazma sprej procesom
EP  - 494
IS  - 4
SP  - 489
VL  - 59
DO  - 10.5937/zasmat1804489M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola",
year = "2018",
abstract = "Tantalum is a very popular material for the industry as a whole because of very important characteristics such as: high melting point, significant thermal and electrical conductivity, high toughness and resistance to corrosion and good biocompatibility. Since the tantalum metal is sensitive to O, N and H gases, tantalum coating layers are deposited only using the vacuum plasma spray process (VPS), which has, in the past few years been used successfully for preparing coatings which are widely used in the preparation of metal implants. The aim of this paper was to, at a low pressure inert gas eliminate the influence of the surrounding atmosphere on the melted Ta powder particles and produce coatings with mechanical and structural characteristics which will find application in biomedicine. For depositing the coating a commercial tantalum powder AMPERIT® 151065 grain size of 10 - 30 μm was used. The powder was deposited with a plasma F4 gun at a distance of substrates at 300 mm. The Ta coating layers were deposited with a thickness of 60 to 70 μm on steel substrates. As the plasma gas used was a mixture of Ar and He inert gases. The microhardness of the coating was tested using the HV0.3 method and the tensile strength of the coatings bond was tested by the tensile method in accordance with the ASTM C633-1 standard. The microstructure of the coating in deposited state and after etching was studied on an optical microscope (OM) and scanning electron microscope (SEM). Etching the coating was carried out in the reagent which consisted of two parts of nitric acid, two parts hydrofluoric acid, and five parts water (2HNO3: 2HF: 5H2O). The structure of the coating consists solely of a tough αTa phase with a body centered cubic lattice. Tests have shown that layers of VPS - Ta coatings have the microstructure and mechanical properties which completely support the use of the coating in the process of making implants., Tantal je veoma atraktivan materijal za industriju u celini zbog veoma bitnih osobina kao što su: visoka temperatura topljenja, značajna toplotna i električna provodljivost, visoka žilavost i otpornost na koroziju i dobra biokompatibilnost. Pošto je tantal metal osetljiv na gasove O, N i H, slojevi prevlake tantala se isključivo deponuju vakuum plazma sprej procesom (VPS), koji se u poslednjih nekoliko godina uspešno koristi za izradu prevlaka koje imaju široku primenu u izradi metalnih implanata. Cilj rada bio je da se na niskom pritisku inertnog gasa eliminiše uticaj okolne atmosfere na istopljene čestice praha Ta i proizvedu prevlake mehaničkih i strukturnih karakteristika koje će naći primenu u biomedicini. Za deponovanje prevlake koristio se komercijalni prah tantala AMPERIT® 151.065 granulacije od 10 - 30µm. Prah je deponovan sa plazma pištoljem F4 na odstojanju podloge od 300 mm. Slojevi Ta prevlaka su deponovani sa debljinom od 60 do 70µm na čeličnim podlogama. Kao plazma gas koristila se mešavina inertnih gasova Ar i He. Mikrotvrdoća prevlake ispitana je metodom HV0.3 a zatezna čvrstoća spoja prevlake ispitana je metodom na zatezanje u skladu sa standardom ASTM C633-1. Mikrostruktura prevlake u deponovnom stanju i u stanju posle nagrizanja ispitana je na optičkom mikroskopu (OM) i na skening elektronskom mikroskopu (SEM). Nagrizanje prevlake sprovedeno je u reagensu koji se sastojao od dva dela azotne kiseline, dva dela fluorovodonične kiseline i pet delova vode (2HNO3 : 2HF : 5H2O). Struktura prevlake se isključivo sastoji od žilave α-Ta faze sa zapreminski centriranom kubnom rešetkom. Ispitivanja su pokazala da slojevi VPS - Ta prevlake imaju mikrostrukturu i mehaničke karakteristike koje u potpunosti omogućavaju primenu prevlake u procesu izrade implanata.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of tantalum coatings deposited using vacuum plasma spray process, Karakterizacija tantal prevlake deponovane vakuum plazma sprej procesom",
pages = "494-489",
number = "4",
volume = "59",
doi = "10.5937/zasmat1804489M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M.,& Bajić, N.. (2018). Characterization of tantalum coatings deposited using vacuum plasma spray process. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 59(4), 489-494.
https://doi.org/10.5937/zasmat1804489M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N. Characterization of tantalum coatings deposited using vacuum plasma spray process. in Zaštita materijala. 2018;59(4):489-494.
doi:10.5937/zasmat1804489M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, "Characterization of tantalum coatings deposited using vacuum plasma spray process" in Zaštita materijala, 59, no. 4 (2018):489-494,
https://doi.org/10.5937/zasmat1804489M . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Radosavljević, Zoran M.
AU  - Bajić, Nikola
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3439
AB  - Temperature, plastic strain and heat generation during the plunge stage of the friction stir welding of high-strength aluminum alloys 2024 T3 and 2024 T351 are considered in this work. The plunging of the tool into the material is done at different rotating speeds. A 3-D finite element model for thermomechanical simulation is developed. It is based on arbitrary Lagrangian-Eulerian formulation, and Johnson-Cook material law is used for modelling of material behaviour. From comparison of the numerical results for alloys 2024 T3 and 2024 T351, it can be seen that the former has more intensive heat generation from the plastic deformation, due to its higher strength. Friction heat generation is only slightly dfferent for the two alloys. Therefore, temperatures in the working plate are higher in the alloy 2024 T3 for the same parameters of the plunge stage. Equivalent plastic strain is higher for 2024 T351 alloy, and the highest values are determined under the tool shoulder and around the tool pin. For the alloy 2024 T3, equivalent plastic strain is the highest in the influence zone of the tool pin.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351
EP  - 254
IS  - 1
SP  - 247
VL  - 20
DO  - 10.2298/TSCI150313059V
ER  - 

@article{
author = "Veljić, Darko and Međo, Bojan and Rakin, Marko and Radosavljević, Zoran M. and Bajić, Nikola",
year = "2016",
abstract = "Temperature, plastic strain and heat generation during the plunge stage of the friction stir welding of high-strength aluminum alloys 2024 T3 and 2024 T351 are considered in this work. The plunging of the tool into the material is done at different rotating speeds. A 3-D finite element model for thermomechanical simulation is developed. It is based on arbitrary Lagrangian-Eulerian formulation, and Johnson-Cook material law is used for modelling of material behaviour. From comparison of the numerical results for alloys 2024 T3 and 2024 T351, it can be seen that the former has more intensive heat generation from the plastic deformation, due to its higher strength. Friction heat generation is only slightly dfferent for the two alloys. Therefore, temperatures in the working plate are higher in the alloy 2024 T3 for the same parameters of the plunge stage. Equivalent plastic strain is higher for 2024 T351 alloy, and the highest values are determined under the tool shoulder and around the tool pin. For the alloy 2024 T3, equivalent plastic strain is the highest in the influence zone of the tool pin.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351",
pages = "254-247",
number = "1",
volume = "20",
doi = "10.2298/TSCI150313059V"
}

Veljić, D., Međo, B., Rakin, M., Radosavljević, Z. M.,& Bajić, N.. (2016). Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(1), 247-254.
https://doi.org/10.2298/TSCI150313059V

Veljić D, Međo B, Rakin M, Radosavljević ZM, Bajić N. Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351. in Thermal Science. 2016;20(1):247-254.
doi:10.2298/TSCI150313059V .

Veljić, Darko, Međo, Bojan, Rakin, Marko, Radosavljević, Zoran M., Bajić, Nikola, "Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351" in Thermal Science, 20, no. 1 (2016):247-254,
https://doi.org/10.2298/TSCI150313059V . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Bobić, Biljana
AU  - Pavlović, Miloš K.
AU  - Alil, Ana
AU  - Putić, Slaviša
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2923
AB  - The effect of one-step and a new (short) two-step aging process on the resistance to stress corrosion cracking of an aluminum alloy 7000 series was investigated, using slow strain rate test and fracture mechanics method. The aging level in the tested alloy was evaluated by means of scanning electron microscopy and measurements of electrical resistivity. It was shown that the alloy after the new two-step aging is significantly more resistant to stress corrosion cracking. Values of tensile properties and fracture toughness are similar for both thermal states. Processes that take place at the crack tip have been considered. The effect of the testing solution temperature on the crack growth rate on the plateau was determined. Two values of the apparent activation energy were obtained. These values correspond to different processes that control crack growth rate on the plateau at higher and lower temperatures.
AB  - Ispitivan je uticaj jednostepenog i novog (kratkotrajnog) dvostepenog termičkog taloženja na otpornost prema naponskoj koroziji aluminijumske legure serije 7000, primenom metode male brzine deformacije i metode mehanike loma. Stepen starenja ispitivane legure je procenjen primenom skening elektronske mikroskopije i na osnovu merenja električne otpornosti. Pokazano je da je legura posle novog dvostepenog termičkog starenja znatno otpornija prema naponskoj koroziji. Vrednosti zateznih karakteristika i žilavosti loma su slične za oba termička stanja legure. Razmatrani su procesi koji se odvijaju na vrhu naponsko-korozione prsline. Određen je uticaj temperature rastvora za ispitivanje na brzinu rasta prsline na platou. Određene su dve vrednosti prividne energije aktivacije. Ove vrednosti odgovaraju različitim procesima koji kontrolišu brzinu rasta prsline na platou, na visokim i niskim temperaturama.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging
T1  - Otpornost aluminijumske legure serije 7000 prema naponskoj koroziji posle dvostepenog termičkog taloženja
EP  - 268
IS  - 2
SP  - 261
VL  - 21
DO  - 10.2298/CICEQ140324024J
ER  - 

@article{
author = "Jegdić, Bore and Bobić, Biljana and Pavlović, Miloš K. and Alil, Ana and Putić, Slaviša",
year = "2015",
abstract = "The effect of one-step and a new (short) two-step aging process on the resistance to stress corrosion cracking of an aluminum alloy 7000 series was investigated, using slow strain rate test and fracture mechanics method. The aging level in the tested alloy was evaluated by means of scanning electron microscopy and measurements of electrical resistivity. It was shown that the alloy after the new two-step aging is significantly more resistant to stress corrosion cracking. Values of tensile properties and fracture toughness are similar for both thermal states. Processes that take place at the crack tip have been considered. The effect of the testing solution temperature on the crack growth rate on the plateau was determined. Two values of the apparent activation energy were obtained. These values correspond to different processes that control crack growth rate on the plateau at higher and lower temperatures., Ispitivan je uticaj jednostepenog i novog (kratkotrajnog) dvostepenog termičkog taloženja na otpornost prema naponskoj koroziji aluminijumske legure serije 7000, primenom metode male brzine deformacije i metode mehanike loma. Stepen starenja ispitivane legure je procenjen primenom skening elektronske mikroskopije i na osnovu merenja električne otpornosti. Pokazano je da je legura posle novog dvostepenog termičkog starenja znatno otpornija prema naponskoj koroziji. Vrednosti zateznih karakteristika i žilavosti loma su slične za oba termička stanja legure. Razmatrani su procesi koji se odvijaju na vrhu naponsko-korozione prsline. Određen je uticaj temperature rastvora za ispitivanje na brzinu rasta prsline na platou. Određene su dve vrednosti prividne energije aktivacije. Ove vrednosti odgovaraju različitim procesima koji kontrolišu brzinu rasta prsline na platou, na visokim i niskim temperaturama.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging, Otpornost aluminijumske legure serije 7000 prema naponskoj koroziji posle dvostepenog termičkog taloženja",
pages = "268-261",
number = "2",
volume = "21",
doi = "10.2298/CICEQ140324024J"
}

Jegdić, B., Bobić, B., Pavlović, M. K., Alil, A.,& Putić, S.. (2015). Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 21(2), 261-268.
https://doi.org/10.2298/CICEQ140324024J

Jegdić B, Bobić B, Pavlović MK, Alil A, Putić S. Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging. in Chemical Industry & Chemical Engineering Quarterly. 2015;21(2):261-268.
doi:10.2298/CICEQ140324024J .

Jegdić, Bore, Bobić, Biljana, Pavlović, Miloš K., Alil, Ana, Putić, Slaviša, "Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging" in Chemical Industry & Chemical Engineering Quarterly, 21, no. 2 (2015):261-268,
https://doi.org/10.2298/CICEQ140324024J . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Popović, Negica
AU  - Daşcău, Horia
AU  - Bajić, Nikola
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2893
AB  - U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu.
AB  - In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu
T1  - Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety
EP  - 116
IS  - 2
SP  - 111
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2893
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Radović, Nenad and Popović, Negica and Daşcău, Horia and Bajić, Nikola",
year = "2015",
abstract = "U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu., In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu, Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety",
pages = "116-111",
number = "2",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2893"
}

Veljić, D., Sedmak, A., Rakin, M., Radović, N., Popović, N., Daşcău, H.,& Bajić, N.. (2015). Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 15(2), 111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893

Veljić D, Sedmak A, Rakin M, Radović N, Popović N, Daşcău H, Bajić N. Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life. 2015;15(2):111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893 .

Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, Radović, Nenad, Popović, Negica, Daşcău, Horia, Bajić, Nikola, "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu" in Structural Integrity and Life, 15, no. 2 (2015):111-116,
https://hdl.handle.net/21.15107/rcub_technorep_2893 .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Bajić, Nikola
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3016
AB  - The aim of this study was to improve the resistance of turbo jet engine parts exposed to high temperatures and overheating and sudden changes in temperature. For this purpose, three thermal barrier coating (TBC) systems NiCrAlCoY2O3/ZrO2MgO, NiCrAlCoY2O3/ZrO2Y2O3 and NiCrAlCoY2O3/ZrO2CeO2Y2O3 were tested. They were deposited using the atmospheric plasma spray process (APS). In order to develop a TBC with the best thermal insulating properties and the highest reliability in relation to aging of materials under the influence of sudden changes in temperature, TBC systems that were deposited on cold and preheated substrates were tested. The network of microcracks on the surfaces of the ceramic layers in deposited condition was analyzed using scanning electron microscopy (SEM). Insulating characteristics of TBC systems were examined by measuring the temperature difference Delta T between the top and bottom surfaces of the samples at a temperature of 1200 degrees C. Testing of TBC for resistance to thermal cyclic behaviour was performed by exposing samples to alternate heating at 1200 degrees C and rapid cooling of the samples to 180 degrees C. Microhardnesses of the TBC system, after completion of thermal cycles, were compared with the values in deposited state. Analyses of thermal insulation properties and thermal cyclic behaviour have shown a correlation between the substrate temperature and quality of the TBC system in thermal cyclic conditions.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Experimental study of insulating properties and behaviour of thermal barrier coating systems in thermo cyclic conditions
EP  - 343
SP  - 337
VL  - 67
DO  - 10.1016/j.matdes.2014.11.029
ER  - 

@article{
author = "Mrdak, Mihailo and Rakin, Marko and Međo, Bojan and Bajić, Nikola",
year = "2015",
abstract = "The aim of this study was to improve the resistance of turbo jet engine parts exposed to high temperatures and overheating and sudden changes in temperature. For this purpose, three thermal barrier coating (TBC) systems NiCrAlCoY2O3/ZrO2MgO, NiCrAlCoY2O3/ZrO2Y2O3 and NiCrAlCoY2O3/ZrO2CeO2Y2O3 were tested. They were deposited using the atmospheric plasma spray process (APS). In order to develop a TBC with the best thermal insulating properties and the highest reliability in relation to aging of materials under the influence of sudden changes in temperature, TBC systems that were deposited on cold and preheated substrates were tested. The network of microcracks on the surfaces of the ceramic layers in deposited condition was analyzed using scanning electron microscopy (SEM). Insulating characteristics of TBC systems were examined by measuring the temperature difference Delta T between the top and bottom surfaces of the samples at a temperature of 1200 degrees C. Testing of TBC for resistance to thermal cyclic behaviour was performed by exposing samples to alternate heating at 1200 degrees C and rapid cooling of the samples to 180 degrees C. Microhardnesses of the TBC system, after completion of thermal cycles, were compared with the values in deposited state. Analyses of thermal insulation properties and thermal cyclic behaviour have shown a correlation between the substrate temperature and quality of the TBC system in thermal cyclic conditions.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Experimental study of insulating properties and behaviour of thermal barrier coating systems in thermo cyclic conditions",
pages = "343-337",
volume = "67",
doi = "10.1016/j.matdes.2014.11.029"
}

Mrdak, M., Rakin, M., Međo, B.,& Bajić, N.. (2015). Experimental study of insulating properties and behaviour of thermal barrier coating systems in thermo cyclic conditions. in Materials & Design
Elsevier Sci Ltd, Oxford., 67, 337-343.
https://doi.org/10.1016/j.matdes.2014.11.029

Mrdak M, Rakin M, Međo B, Bajić N. Experimental study of insulating properties and behaviour of thermal barrier coating systems in thermo cyclic conditions. in Materials & Design. 2015;67:337-343.
doi:10.1016/j.matdes.2014.11.029 .

Mrdak, Mihailo, Rakin, Marko, Međo, Bojan, Bajić, Nikola, "Experimental study of insulating properties and behaviour of thermal barrier coating systems in thermo cyclic conditions" in Materials & Design, 67 (2015):337-343,
https://doi.org/10.1016/j.matdes.2014.11.029 . .

TY  - JOUR
AU  - Bajić, Nikola
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Stojadinović, Slobodan
AU  - Pekez, Jasmina
AU  - Mrdak, Mihailo
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2615
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Experimental laboratory for development of fillers and auxiliary materials for welding and soldering (2)
T1  - Eksperimentalna laboratorija za razvoj dodatnih i pomoćnih materijala za zavarivanje i lemljenje (2)
EP  - 9
IS  - 1
SP  - 5
VL  - 59
DO  - 10.5937/zzk1401005B
ER  - 

@article{
author = "Bajić, Nikola and Veljić, Darko and Rakin, Marko and Stojadinović, Slobodan and Pekez, Jasmina and Mrdak, Mihailo",
year = "2014",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Experimental laboratory for development of fillers and auxiliary materials for welding and soldering (2), Eksperimentalna laboratorija za razvoj dodatnih i pomoćnih materijala za zavarivanje i lemljenje (2)",
pages = "9-5",
number = "1",
volume = "59",
doi = "10.5937/zzk1401005B"
}

Bajić, N., Veljić, D., Rakin, M., Stojadinović, S., Pekez, J.,& Mrdak, M.. (2014). Experimental laboratory for development of fillers and auxiliary materials for welding and soldering (2). in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 59(1), 5-9.
https://doi.org/10.5937/zzk1401005B

Bajić N, Veljić D, Rakin M, Stojadinović S, Pekez J, Mrdak M. Experimental laboratory for development of fillers and auxiliary materials for welding and soldering (2). in Zavarivanje i zavarene konstrukcije. 2014;59(1):5-9.
doi:10.5937/zzk1401005B .

Bajić, Nikola, Veljić, Darko, Rakin, Marko, Stojadinović, Slobodan, Pekez, Jasmina, Mrdak, Mihailo, "Experimental laboratory for development of fillers and auxiliary materials for welding and soldering (2)" in Zavarivanje i zavarene konstrukcije, 59, no. 1 (2014):5-9,
https://doi.org/10.5937/zzk1401005B . .

TY  - JOUR
AU  - Bajić, Nikola
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Mrdak, Mihailo
AU  - Stojadinović, Slobodan
AU  - Pekez, Jasmina
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2617
AB  - This paper presents the results related to organizing production of flux-cored wire alloyed with Ni and Mo according to standard AWS A5.29 intended for the MAG welding process. On the experimental line for steel strip calibration and production of flux-cored wire two batches of flux-cored wire were produced with a constant Mo and Ni content at two levels (1.2% Ni in one and 2.6% Ni in the other batch). Experimental welding of steel plate samples was performed using the MAG process with two qualities of cored wire. Testing the structure and quality of the weld metal was done in order to optimize content of Ni in the alloyed flux-cored wire intended for welding fine grained micro-alloyed steels. Based on the analysis of test results of the microstructure and EDS analysis of the structure of welded samples and test results of tensile properties and impact energy, conclusions were made about the optimal content of Ni in the weld metal, and thus the choice of quality of flux-cored wire.
AB  - U radu su dati rezultati vezani za osvajanje proizvodnje punjene žice legirane sa Ni i Mo prema standardu AWS A5.29 namenjeno za MAG postupak zavarivanja. Na eksperimentalnoj liniji za kalibraciju čelične trake i izradu punjene žice proizvedene su dve šarže punjene žice sa konstantnim sadržajem Mo i sadržajem Ni na dva nivoa (1.2%Ni kod jedne i 2.6%Ni kod druge šarže). Eksperimentalno zavarivanje uzoraka čeličnih ploča je izvedeno MAG postupkom sa dva kvaliteta punjene žice. Ispitivanje strukture i kvaliteta metala šava je izvedeno u cilju optimizacije sadržaja Ni u legiranoj punjenoj žici koja je namenjena za zavarivanje sitnozrnih mikrolegiranih čelika. Na osnovu analize dobijenih rezultata ispitivanja mikrostrukture i EDS analize strukture zavarenih uzoraka i rezultata ispitivanja zateznih karakteristika energije udara, dati su zaključci o optimalnom sadržaju Ni u metalu šava, a time i izboru kvaliteta punjene žice.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Optimizing the content of nickel in flux-cored wire intended for welding micro-alloyed steels
T1  - Optimizacija sadržaja nikla u punjenoj žici namenjenoj za zavarivanje mikrolegiranih čelika
EP  - 67
IS  - 2
SP  - 61
VL  - 59
DO  - 10.5937/zzk1402061B
ER  - 

@article{
author = "Bajić, Nikola and Rakin, Marko and Veljić, Darko and Mrdak, Mihailo and Stojadinović, Slobodan and Pekez, Jasmina",
year = "2014",
abstract = "This paper presents the results related to organizing production of flux-cored wire alloyed with Ni and Mo according to standard AWS A5.29 intended for the MAG welding process. On the experimental line for steel strip calibration and production of flux-cored wire two batches of flux-cored wire were produced with a constant Mo and Ni content at two levels (1.2% Ni in one and 2.6% Ni in the other batch). Experimental welding of steel plate samples was performed using the MAG process with two qualities of cored wire. Testing the structure and quality of the weld metal was done in order to optimize content of Ni in the alloyed flux-cored wire intended for welding fine grained micro-alloyed steels. Based on the analysis of test results of the microstructure and EDS analysis of the structure of welded samples and test results of tensile properties and impact energy, conclusions were made about the optimal content of Ni in the weld metal, and thus the choice of quality of flux-cored wire., U radu su dati rezultati vezani za osvajanje proizvodnje punjene žice legirane sa Ni i Mo prema standardu AWS A5.29 namenjeno za MAG postupak zavarivanja. Na eksperimentalnoj liniji za kalibraciju čelične trake i izradu punjene žice proizvedene su dve šarže punjene žice sa konstantnim sadržajem Mo i sadržajem Ni na dva nivoa (1.2%Ni kod jedne i 2.6%Ni kod druge šarže). Eksperimentalno zavarivanje uzoraka čeličnih ploča je izvedeno MAG postupkom sa dva kvaliteta punjene žice. Ispitivanje strukture i kvaliteta metala šava je izvedeno u cilju optimizacije sadržaja Ni u legiranoj punjenoj žici koja je namenjena za zavarivanje sitnozrnih mikrolegiranih čelika. Na osnovu analize dobijenih rezultata ispitivanja mikrostrukture i EDS analize strukture zavarenih uzoraka i rezultata ispitivanja zateznih karakteristika energije udara, dati su zaključci o optimalnom sadržaju Ni u metalu šava, a time i izboru kvaliteta punjene žice.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Optimizing the content of nickel in flux-cored wire intended for welding micro-alloyed steels, Optimizacija sadržaja nikla u punjenoj žici namenjenoj za zavarivanje mikrolegiranih čelika",
pages = "67-61",
number = "2",
volume = "59",
doi = "10.5937/zzk1402061B"
}

Bajić, N., Rakin, M., Veljić, D., Mrdak, M., Stojadinović, S.,& Pekez, J.. (2014). Optimizing the content of nickel in flux-cored wire intended for welding micro-alloyed steels. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 59(2), 61-67.
https://doi.org/10.5937/zzk1402061B

Bajić N, Rakin M, Veljić D, Mrdak M, Stojadinović S, Pekez J. Optimizing the content of nickel in flux-cored wire intended for welding micro-alloyed steels. in Zavarivanje i zavarene konstrukcije. 2014;59(2):61-67.
doi:10.5937/zzk1402061B .

Bajić, Nikola, Rakin, Marko, Veljić, Darko, Mrdak, Mihailo, Stojadinović, Slobodan, Pekez, Jasmina, "Optimizing the content of nickel in flux-cored wire intended for welding micro-alloyed steels" in Zavarivanje i zavarene konstrukcije, 59, no. 2 (2014):61-67,
https://doi.org/10.5937/zzk1402061B . .

TY  - JOUR
AU  - Bajić, N.
AU  - Bajić, D.
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Janjusević, Z.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2844
AB  - This paper analyzes, from the metallurgical aspect, the quality of the new flux-cored wire intended for the MAG welding process in function of changes in shielding gas composition and changes in welding parameters. The results of comparative analysis of the microstructure of the weld metal and Heat Affected Zone (HAZ) allow drawing conclusions about the feasibility of introducing a new quality flux-cored wire in industrial applications.
PB  - Croatian Metallurgical Soc, Zagreb
T2  - Metalurgija
T1  - The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics
EP  - 364
IS  - 3
SP  - 361
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2844
ER  - 

@article{
author = "Bajić, N. and Bajić, D. and Veljić, Darko and Rakin, Marko and Janjusević, Z.",
year = "2014",
abstract = "This paper analyzes, from the metallurgical aspect, the quality of the new flux-cored wire intended for the MAG welding process in function of changes in shielding gas composition and changes in welding parameters. The results of comparative analysis of the microstructure of the weld metal and Heat Affected Zone (HAZ) allow drawing conclusions about the feasibility of introducing a new quality flux-cored wire in industrial applications.",
publisher = "Croatian Metallurgical Soc, Zagreb",
journal = "Metalurgija",
title = "The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics",
pages = "364-361",
number = "3",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2844"
}

Bajić, N., Bajić, D., Veljić, D., Rakin, M.,& Janjusević, Z.. (2014). The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics. in Metalurgija
Croatian Metallurgical Soc, Zagreb., 53(3), 361-364.
https://hdl.handle.net/21.15107/rcub_technorep_2844

Bajić N, Bajić D, Veljić D, Rakin M, Janjusević Z. The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics. in Metalurgija. 2014;53(3):361-364.
https://hdl.handle.net/21.15107/rcub_technorep_2844 .

Bajić, N., Bajić, D., Veljić, Darko, Rakin, Marko, Janjusević, Z., "The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics" in Metalurgija, 53, no. 3 (2014):361-364,
https://hdl.handle.net/21.15107/rcub_technorep_2844 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Bajić, Nikola
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2342
AB  - The aim of this paper is to analyze changes of vertical force and temperature during friction stir welding process of high strength aluminum alloys (2024 T3). FSW process is a complex nonlinear process accompanied by large plastic deformation, high temperatures and plastic material flow in the welding zone. It is the procedure of material connecting in the so-called solid phase, through the combined action of heat and mechanical work. Analysis of force and temperature changes during the process of welding allows better understanding and control of the process. This paper analyzes the change of force in the vertical direction using a dynamometer and temperature changes on the upper surface of the working panel near the tops of the roller tool using thermal imaging cameras.
AB  - Cilj rada je analiza promene vertikalne sile i temperature tokom procesa zavarivanja trenjem mešanjem (FSW) legura aluminijuma visoke čvrstoće (2024 T3). FSW postupak je složen nelinearan proces praćen velikim plastičnim deformacijama, visokim temperaturama i plastičnim tečenjem materijala u zoni zavarivanja. To je postupak spajanja materijala u tzv. čvrstoj fazi, kombinovanim delovanjem toplote i mehaničkog rada. Analiza promene sile i temperature tokom procesa zavarivanja omogućava bolje razumevanje i kontrolu samog procesa. U radu je analizirana i praćena promena sile u vertikalnom pravcu pomoću dinamometra i promena temperature na gornjoj površini radne ploče u blizini čela valjka alata pomoću termovizijske kamere.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Change of temperature and vertical force during friction stir welding
T1  - Promena temperature i vertikalne sile tokom procesa zavarivanja trenjem mešanjem
EP  - 59
IS  - 2
SP  - 53
VL  - 58
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2342
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Radović, Nenad and Bajić, Nikola",
year = "2013",
abstract = "The aim of this paper is to analyze changes of vertical force and temperature during friction stir welding process of high strength aluminum alloys (2024 T3). FSW process is a complex nonlinear process accompanied by large plastic deformation, high temperatures and plastic material flow in the welding zone. It is the procedure of material connecting in the so-called solid phase, through the combined action of heat and mechanical work. Analysis of force and temperature changes during the process of welding allows better understanding and control of the process. This paper analyzes the change of force in the vertical direction using a dynamometer and temperature changes on the upper surface of the working panel near the tops of the roller tool using thermal imaging cameras., Cilj rada je analiza promene vertikalne sile i temperature tokom procesa zavarivanja trenjem mešanjem (FSW) legura aluminijuma visoke čvrstoće (2024 T3). FSW postupak je složen nelinearan proces praćen velikim plastičnim deformacijama, visokim temperaturama i plastičnim tečenjem materijala u zoni zavarivanja. To je postupak spajanja materijala u tzv. čvrstoj fazi, kombinovanim delovanjem toplote i mehaničkog rada. Analiza promene sile i temperature tokom procesa zavarivanja omogućava bolje razumevanje i kontrolu samog procesa. U radu je analizirana i praćena promena sile u vertikalnom pravcu pomoću dinamometra i promena temperature na gornjoj površini radne ploče u blizini čela valjka alata pomoću termovizijske kamere.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Change of temperature and vertical force during friction stir welding, Promena temperature i vertikalne sile tokom procesa zavarivanja trenjem mešanjem",
pages = "59-53",
number = "2",
volume = "58",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2342"
}

Veljić, D., Sedmak, A., Rakin, M., Radović, N.,& Bajić, N.. (2013). Change of temperature and vertical force during friction stir welding. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 58(2), 53-59.
https://hdl.handle.net/21.15107/rcub_technorep_2342

Veljić D, Sedmak A, Rakin M, Radović N, Bajić N. Change of temperature and vertical force during friction stir welding. in Zavarivanje i zavarene konstrukcije. 2013;58(2):53-59.
https://hdl.handle.net/21.15107/rcub_technorep_2342 .

Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, Radović, Nenad, Bajić, Nikola, "Change of temperature and vertical force during friction stir welding" in Zavarivanje i zavarene konstrukcije, 58, no. 2 (2013):53-59,
https://hdl.handle.net/21.15107/rcub_technorep_2342 .

TY  - JOUR
AU  - Bajić, Nikola
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Stojadinović, Slobodan
AU  - Pekez, Jasmina
AU  - Mrdak, Mihailo
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2352
AB  - The development of new materials and their use in construction of modern devices and structures requires the development of fillers and auxiliary materials for their joining. Development and mastering of production of adequate quality fillers in addition to scientific knowledge requires possession of appropriate experimental equipment. The experimental laboratory that has the appropriate technological equipment and devices provides real opportunities for development and mastering of production of new quality fillers and auxiliary materials for welding and soldering.
AB  - Razvoj novih materijala i njihova primena u izradi savremenih uređaja i konstrukcija zahteva razvoj dodatnih i pomoćnih materijala za njihovo spajanje. Razvoj i osvajanje proizvodnje odgovarajućih kvaliteta dodatnih materijala pored naučnih i stručnih saznanja zahteva i posedovanje odgovarajuće eksperimentalne opreme. Eksperimentalna laboratorija koja poseduje odgovarajuću tehnološku opremu i uređaje pruža realne mogućnosti za razvoj i osvajanje proivodnje novih kvaliteta dodatnih i pomoćnih materijala za zavarivanje i lemljenje.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Experimental laboratory for development of fillers and auxiliary materials for welding and soldering
T1  - Eksperimentalna laboratorija za razvoj dodatnih i pomoćnih materijala za zavarivanje i lemljenje
EP  - 161
IS  - 4
SP  - 157
VL  - 58
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2352
ER  - 

@article{
author = "Bajić, Nikola and Veljić, Darko and Rakin, Marko and Stojadinović, Slobodan and Pekez, Jasmina and Mrdak, Mihailo",
year = "2013",
abstract = "The development of new materials and their use in construction of modern devices and structures requires the development of fillers and auxiliary materials for their joining. Development and mastering of production of adequate quality fillers in addition to scientific knowledge requires possession of appropriate experimental equipment. The experimental laboratory that has the appropriate technological equipment and devices provides real opportunities for development and mastering of production of new quality fillers and auxiliary materials for welding and soldering., Razvoj novih materijala i njihova primena u izradi savremenih uređaja i konstrukcija zahteva razvoj dodatnih i pomoćnih materijala za njihovo spajanje. Razvoj i osvajanje proizvodnje odgovarajućih kvaliteta dodatnih materijala pored naučnih i stručnih saznanja zahteva i posedovanje odgovarajuće eksperimentalne opreme. Eksperimentalna laboratorija koja poseduje odgovarajuću tehnološku opremu i uređaje pruža realne mogućnosti za razvoj i osvajanje proivodnje novih kvaliteta dodatnih i pomoćnih materijala za zavarivanje i lemljenje.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Experimental laboratory for development of fillers and auxiliary materials for welding and soldering, Eksperimentalna laboratorija za razvoj dodatnih i pomoćnih materijala za zavarivanje i lemljenje",
pages = "161-157",
number = "4",
volume = "58",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2352"
}

Bajić, N., Veljić, D., Rakin, M., Stojadinović, S., Pekez, J.,& Mrdak, M.. (2013). Experimental laboratory for development of fillers and auxiliary materials for welding and soldering. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 58(4), 157-161.
https://hdl.handle.net/21.15107/rcub_technorep_2352

Bajić N, Veljić D, Rakin M, Stojadinović S, Pekez J, Mrdak M. Experimental laboratory for development of fillers and auxiliary materials for welding and soldering. in Zavarivanje i zavarene konstrukcije. 2013;58(4):157-161.
https://hdl.handle.net/21.15107/rcub_technorep_2352 .

Bajić, Nikola, Veljić, Darko, Rakin, Marko, Stojadinović, Slobodan, Pekez, Jasmina, Mrdak, Mihailo, "Experimental laboratory for development of fillers and auxiliary materials for welding and soldering" in Zavarivanje i zavarene konstrukcije, 58, no. 4 (2013):157-161,
https://hdl.handle.net/21.15107/rcub_technorep_2352 .

TY  - JOUR
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Mrdak, Mihailo
AU  - Veljić, Darko
AU  - Arsić, Miodrag
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2385
AB  - The aim of this study was to master new quality cored wires made of steel strips and the cores filled with metal powders and low molecular hydrophobic compounds. For experimental research, the specimens were made of micro alloyed steel type NIOMOL 490K intended for making welded structures subjected to dynamic loads and effects of low temperature. Welding of test specimens was done using the MAG method in CO2 shielding with two new quality cored wires. The testing included the determination of mechanical properties of the base metal (BM) and the weld metal (WM), which apart from having sufficient strength must also have good toughness. The microstructures of BM, WM and heat affected zone (HAZ) were analysed, due to possible formation of a heterogeneous microstructure, which can reduce toughness. Results of testing of welded joints should define a new quality of cored wires in view of welding-technological characteristics. The results indicate that the new quality cored wires can produce good mechanical-structural properties of welded joints.
PB  - University of Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki vjesnik-Technical Gazette
T1  - Analysis of mechanical and structural properties of micro alloyed steel welded joints depending on quality of cored wire
EP  - 640
IS  - 4
SP  - 635
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2385
ER  - 

@article{
author = "Rakin, Marko and Bajić, Nikola and Mrdak, Mihailo and Veljić, Darko and Arsić, Miodrag",
year = "2013",
abstract = "The aim of this study was to master new quality cored wires made of steel strips and the cores filled with metal powders and low molecular hydrophobic compounds. For experimental research, the specimens were made of micro alloyed steel type NIOMOL 490K intended for making welded structures subjected to dynamic loads and effects of low temperature. Welding of test specimens was done using the MAG method in CO2 shielding with two new quality cored wires. The testing included the determination of mechanical properties of the base metal (BM) and the weld metal (WM), which apart from having sufficient strength must also have good toughness. The microstructures of BM, WM and heat affected zone (HAZ) were analysed, due to possible formation of a heterogeneous microstructure, which can reduce toughness. Results of testing of welded joints should define a new quality of cored wires in view of welding-technological characteristics. The results indicate that the new quality cored wires can produce good mechanical-structural properties of welded joints.",
publisher = "University of Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki vjesnik-Technical Gazette",
title = "Analysis of mechanical and structural properties of micro alloyed steel welded joints depending on quality of cored wire",
pages = "640-635",
number = "4",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2385"
}

Rakin, M., Bajić, N., Mrdak, M., Veljić, D.,& Arsić, M.. (2013). Analysis of mechanical and structural properties of micro alloyed steel welded joints depending on quality of cored wire. in Tehnicki vjesnik-Technical Gazette
University of Osijek, Tech Fac, Slavonski Brod., 20(4), 635-640.
https://hdl.handle.net/21.15107/rcub_technorep_2385

Rakin M, Bajić N, Mrdak M, Veljić D, Arsić M. Analysis of mechanical and structural properties of micro alloyed steel welded joints depending on quality of cored wire. in Tehnicki vjesnik-Technical Gazette. 2013;20(4):635-640.
https://hdl.handle.net/21.15107/rcub_technorep_2385 .

Rakin, Marko, Bajić, Nikola, Mrdak, Mihailo, Veljić, Darko, Arsić, Miodrag, "Analysis of mechanical and structural properties of micro alloyed steel welded joints depending on quality of cored wire" in Tehnicki vjesnik-Technical Gazette, 20, no. 4 (2013):635-640,
https://hdl.handle.net/21.15107/rcub_technorep_2385 .

TY  - JOUR
AU  - Bajić, N.
AU  - Bajić, Darko
AU  - Veljić, Darko
AU  - Rakin, Marko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2527
AB  - The objective of this paper is the analysis and evaluation of the quality of the new flux-cored wire designed for the MAG welding process that was developed and produced using special laboratory equipment. Experimental welding was performed with the new activated flux-cored wire and classic solid wire with changing of welding parameters and shielding gas composition (100 % CO2 and gas mixtures of Ar + CO2 + O-2).
PB  - Croatian Metallurgical Soc, Zagreb
T2  - Metalurgija
T1  - Advantage of use of activated flux-cored wire instead of solid wire with the mag welding process from the mechanical properties aspect
EP  - 456
IS  - 4
SP  - 453
VL  - 52
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2527
ER  - 

@article{
author = "Bajić, N. and Bajić, Darko and Veljić, Darko and Rakin, Marko",
year = "2013",
abstract = "The objective of this paper is the analysis and evaluation of the quality of the new flux-cored wire designed for the MAG welding process that was developed and produced using special laboratory equipment. Experimental welding was performed with the new activated flux-cored wire and classic solid wire with changing of welding parameters and shielding gas composition (100 % CO2 and gas mixtures of Ar + CO2 + O-2).",
publisher = "Croatian Metallurgical Soc, Zagreb",
journal = "Metalurgija",
title = "Advantage of use of activated flux-cored wire instead of solid wire with the mag welding process from the mechanical properties aspect",
pages = "456-453",
number = "4",
volume = "52",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2527"
}

Bajić, N., Bajić, D., Veljić, D.,& Rakin, M.. (2013). Advantage of use of activated flux-cored wire instead of solid wire with the mag welding process from the mechanical properties aspect. in Metalurgija
Croatian Metallurgical Soc, Zagreb., 52(4), 453-456.
https://hdl.handle.net/21.15107/rcub_technorep_2527

Bajić N, Bajić D, Veljić D, Rakin M. Advantage of use of activated flux-cored wire instead of solid wire with the mag welding process from the mechanical properties aspect. in Metalurgija. 2013;52(4):453-456.
https://hdl.handle.net/21.15107/rcub_technorep_2527 .

Bajić, N., Bajić, Darko, Veljić, Darko, Rakin, Marko, "Advantage of use of activated flux-cored wire instead of solid wire with the mag welding process from the mechanical properties aspect" in Metalurgija, 52, no. 4 (2013):453-456,
https://hdl.handle.net/21.15107/rcub_technorep_2527 .

TY  - CONF
AU  - Bobić, Biljana
AU  - Jegdić, Bore V.
AU  - Alil, Ana
AU  - Radosavljević, Miroslav
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6113
AB  - Interkristalna, naponska, galvanska, piting korozija i korozija u zazorima se često javljaju u zavarenim spojevima. Opisani su uslovi pri kojima dolazi do pojave navedenih oblika korozije. Posebno su razmatrani slučajevi korozije zavarenih spojeva u praksi. Za svaki pojedinačan slučaj korozije objašnjeni su uzroci nastanka i uslovi odigravanja procesa korozije. Navedeni su postupci i mere koje treba preduzeti u cilju sprečavanja korozije zavarenog spoja u konkretnom slučaju, kao i u slučaju zavarenih spojeva različitih metala i legura uopšte.
PB  - Društvo za unapređivanje zavarivanja u Srbij - DUZS. Beograd, Srbija, Divčibare, Srbija
C3  - 27. savetovanje sa međunarodnim učešćem ZAVARIVANJE 2012
T1  - Corrosion of Welded Joints - Case Studies
EP  - 8
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6113
ER  - 

@conference{
author = "Bobić, Biljana and Jegdić, Bore V. and Alil, Ana and Radosavljević, Miroslav",
year = "2012",
abstract = "Interkristalna, naponska, galvanska, piting korozija i korozija u zazorima se često javljaju u zavarenim spojevima. Opisani su uslovi pri kojima dolazi do pojave navedenih oblika korozije. Posebno su razmatrani slučajevi korozije zavarenih spojeva u praksi. Za svaki pojedinačan slučaj korozije objašnjeni su uzroci nastanka i uslovi odigravanja procesa korozije. Navedeni su postupci i mere koje treba preduzeti u cilju sprečavanja korozije zavarenog spoja u konkretnom slučaju, kao i u slučaju zavarenih spojeva različitih metala i legura uopšte.",
publisher = "Društvo za unapređivanje zavarivanja u Srbij - DUZS. Beograd, Srbija, Divčibare, Srbija",
journal = "27. savetovanje sa međunarodnim učešćem ZAVARIVANJE 2012",
title = "Corrosion of Welded Joints - Case Studies",
pages = "8-1",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6113"
}

Bobić, B., Jegdić, B. V., Alil, A.,& Radosavljević, M.. (2012). Corrosion of Welded Joints - Case Studies. in 27. savetovanje sa međunarodnim učešćem ZAVARIVANJE 2012
Društvo za unapređivanje zavarivanja u Srbij - DUZS. Beograd, Srbija, Divčibare, Srbija., 1-8.
https://hdl.handle.net/21.15107/rcub_technorep_6113

Bobić B, Jegdić BV, Alil A, Radosavljević M. Corrosion of Welded Joints - Case Studies. in 27. savetovanje sa međunarodnim učešćem ZAVARIVANJE 2012. 2012;:1-8.
https://hdl.handle.net/21.15107/rcub_technorep_6113 .

Bobić, Biljana, Jegdić, Bore V., Alil, Ana, Radosavljević, Miroslav, "Corrosion of Welded Joints - Case Studies" in 27. savetovanje sa međunarodnim učešćem ZAVARIVANJE 2012 (2012):1-8,
https://hdl.handle.net/21.15107/rcub_technorep_6113 .

TY  - JOUR
AU  - Jegdić, Bore V.
AU  - Bobić, Biljana
AU  - Alil, Ana
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6226
AB  - Opisani su osnovni mehanizmi naponske korozije različitih metala i legura i njihovih zavarenih spojeva. Detaljnije su
razmotreni metalurški i korozioni uslovi nastanka naponske korozije ugljeničnih i niskolegiranih čelika, a posebno
njihovih zavarenih spojeva. Najveća pažnja u ovom radu je posvećena razmatranju naponske korozije nerđajućih
čelika (austenitnih, martenzitnih, feritnih i dupleks nerđajućih čelika) i posebno njihovih zavarenih spojeva. Značajna
pažnja je takođe posvećena naponskoj koroziji aluminijumskih legura serije 2000 (Al-Cu-Mg), 5000 (Al-Mn, Al-Mg-Mn)
i 7000 (Al-Zn-Mg-(Cu)), dok je naponska korozija zavarenih spojeva kod legura bakra, legura titana i legura nikla
samo ukratko razmotrena.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd, Srbija
T2  - Zavarivanje i zavarene konstrukcije
T1  - Naponska korozija metala i legura i njihovih zavarenih spojeva, Deo I: uslovi nastanka naponske korozije
EP  - 41
IS  - 1
SP  - 35
VL  - 57
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6226
ER  - 

@article{
author = "Jegdić, Bore V. and Bobić, Biljana and Alil, Ana",
year = "2012",
abstract = "Opisani su osnovni mehanizmi naponske korozije različitih metala i legura i njihovih zavarenih spojeva. Detaljnije su
razmotreni metalurški i korozioni uslovi nastanka naponske korozije ugljeničnih i niskolegiranih čelika, a posebno
njihovih zavarenih spojeva. Najveća pažnja u ovom radu je posvećena razmatranju naponske korozije nerđajućih
čelika (austenitnih, martenzitnih, feritnih i dupleks nerđajućih čelika) i posebno njihovih zavarenih spojeva. Značajna
pažnja je takođe posvećena naponskoj koroziji aluminijumskih legura serije 2000 (Al-Cu-Mg), 5000 (Al-Mn, Al-Mg-Mn)
i 7000 (Al-Zn-Mg-(Cu)), dok je naponska korozija zavarenih spojeva kod legura bakra, legura titana i legura nikla
samo ukratko razmotrena.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd, Srbija",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Naponska korozija metala i legura i njihovih zavarenih spojeva, Deo I: uslovi nastanka naponske korozije",
pages = "41-35",
number = "1",
volume = "57",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6226"
}

Jegdić, B. V., Bobić, B.,& Alil, A.. (2012). Naponska korozija metala i legura i njihovih zavarenih spojeva, Deo I: uslovi nastanka naponske korozije. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd, Srbija., 57(1), 35-41.
https://hdl.handle.net/21.15107/rcub_technorep_6226

Jegdić BV, Bobić B, Alil A. Naponska korozija metala i legura i njihovih zavarenih spojeva, Deo I: uslovi nastanka naponske korozije. in Zavarivanje i zavarene konstrukcije. 2012;57(1):35-41.
https://hdl.handle.net/21.15107/rcub_technorep_6226 .

Jegdić, Bore V., Bobić, Biljana, Alil, Ana, "Naponska korozija metala i legura i njihovih zavarenih spojeva, Deo I: uslovi nastanka naponske korozije" in Zavarivanje i zavarene konstrukcije, 57, no. 1 (2012):35-41,
https://hdl.handle.net/21.15107/rcub_technorep_6226 .