TY  - JOUR
AU  - Kamberović, Željko
AU  - Filipović, Dušica
AU  - Raić, Karlo
AU  - Tasić, Miloš
AU  - Andić, Zoran
AU  - Gavrilovski, Milorad
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1883
AB  - The reduction of WO(3) with hydrogen in a vertical tube reactor is a new approach to the reduction of tungsten oxide compared to conventional procedures in a stationary layer. The advantage of this method is the intensive contact between the reducent and the oxide particles, a higher degree and a shorter time of reduction of only a few seconds, compared to the several hours processing time in a horizontal tube reactor. The characterization of the WO(3) powder and of the tungsten powder included a SEM microstructural examination and DT/TG analyses. The SEM examination of the tungsten powder indicates the presence of small particles with a size of about 1 mu m, also within an agglomerated porous foam structure. Tungsten powder with a particle size of less than 1 mu m is obtained at an optimal temperature with a suitable flow of hydrogen, as a result of stretching and the cracking of large particles, first in the reaction zone, and then, due to appropriate shock of the temperature, outside of this zone. Using an appropriate mathematical model, the degree of reduction and the time required for the formation of tungsten particles during the hydrogen reduction of WO(3) in a vertical tube reactor were determined. Experimental studies have shown that the degree of reduction of WO(3) with hydrogen in a vertical tube reactor increases with the temperature and the flow of hydrogen.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Reduction of ultra-fine tungsten powder with tungsten (vi) oxide in a vertical tube reactor
EP  - 32
IS  - 1
SP  - 27
VL  - 45
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1883
ER  - 

@article{
author = "Kamberović, Željko and Filipović, Dušica and Raić, Karlo and Tasić, Miloš and Andić, Zoran and Gavrilovski, Milorad",
year = "2011",
abstract = "The reduction of WO(3) with hydrogen in a vertical tube reactor is a new approach to the reduction of tungsten oxide compared to conventional procedures in a stationary layer. The advantage of this method is the intensive contact between the reducent and the oxide particles, a higher degree and a shorter time of reduction of only a few seconds, compared to the several hours processing time in a horizontal tube reactor. The characterization of the WO(3) powder and of the tungsten powder included a SEM microstructural examination and DT/TG analyses. The SEM examination of the tungsten powder indicates the presence of small particles with a size of about 1 mu m, also within an agglomerated porous foam structure. Tungsten powder with a particle size of less than 1 mu m is obtained at an optimal temperature with a suitable flow of hydrogen, as a result of stretching and the cracking of large particles, first in the reaction zone, and then, due to appropriate shock of the temperature, outside of this zone. Using an appropriate mathematical model, the degree of reduction and the time required for the formation of tungsten particles during the hydrogen reduction of WO(3) in a vertical tube reactor were determined. Experimental studies have shown that the degree of reduction of WO(3) with hydrogen in a vertical tube reactor increases with the temperature and the flow of hydrogen.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Reduction of ultra-fine tungsten powder with tungsten (vi) oxide in a vertical tube reactor",
pages = "32-27",
number = "1",
volume = "45",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1883"
}

Kamberović, Ž., Filipović, D., Raić, K., Tasić, M., Andić, Z.,& Gavrilovski, M.. (2011). Reduction of ultra-fine tungsten powder with tungsten (vi) oxide in a vertical tube reactor. in Materiali in Tehnologije
Institute of Metals and Technology., 45(1), 27-32.
https://hdl.handle.net/21.15107/rcub_technorep_1883

Kamberović Ž, Filipović D, Raić K, Tasić M, Andić Z, Gavrilovski M. Reduction of ultra-fine tungsten powder with tungsten (vi) oxide in a vertical tube reactor. in Materiali in Tehnologije. 2011;45(1):27-32.
https://hdl.handle.net/21.15107/rcub_technorep_1883 .

Kamberović, Željko, Filipović, Dušica, Raić, Karlo, Tasić, Miloš, Andić, Zoran, Gavrilovski, Milorad, "Reduction of ultra-fine tungsten powder with tungsten (vi) oxide in a vertical tube reactor" in Materiali in Tehnologije, 45, no. 1 (2011):27-32,
https://hdl.handle.net/21.15107/rcub_technorep_1883 .

TY  - JOUR
AU  - Korać, Marija
AU  - Kamberović, Željko
AU  - Anđić, Zoran
AU  - Tasić, Miloš
AU  - Vujović, Aleksandar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1830
AB  - This paper presents the results of examined tribological properties of the multiple strengthened nanocomposite Cu-Al2O3 system. Cu-Al2O3 composite powder was obtained by combination of the thermo-chemical procedure and mechanical alloying, which is a completely new approach to synthesis of these materials. The synthesized powders were cold pressed with 940MPa and sintered in hydrogen atmosphere in temperature range of 725-925oC during 15-120 minutes. The samples were thermo-mechanically treated in two stages after sintering: cold rolling with the final reduction degree of 30% and annealing at 800oC for 1h in hydrogen atmosphere. Characterization of the sintered, rolled and annealed samples included the microstructural examination by scanning electron microscopy (SEM), the quantitative analysis of the SEM microphotographs and the examination on tribological properties. Tribological examinations have shown that the best wear resistance have the samples after heat treatment. The significant influence on the tribological properties has the effect of multiple strengthening mechanisms. These mechanisms include strengthening of copper matrix achieved by dispersion of fine particles of Al2O3, strengthening by the grain boundaries due of the appearance of nanosized Al2O3 particles and the CuxAlyOz phase, as well as by deformation strengthening and strengthening by annealing. Based on the results of the quantitative analysis and tribological examinations, it can be concluded that apart from these strengthening effects porosity also has a significant influence on the tribological properties, i.e. reduction of the volume share in porosity improves tribological properties.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - The analysis of the tribological properties of multiple strengthened nanocomposite of the Cu-Al2o3 system
EP  - 55
IS  - 1
SP  - 49
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1830
ER  - 

@article{
author = "Korać, Marija and Kamberović, Željko and Anđić, Zoran and Tasić, Miloš and Vujović, Aleksandar",
year = "2011",
abstract = "This paper presents the results of examined tribological properties of the multiple strengthened nanocomposite Cu-Al2O3 system. Cu-Al2O3 composite powder was obtained by combination of the thermo-chemical procedure and mechanical alloying, which is a completely new approach to synthesis of these materials. The synthesized powders were cold pressed with 940MPa and sintered in hydrogen atmosphere in temperature range of 725-925oC during 15-120 minutes. The samples were thermo-mechanically treated in two stages after sintering: cold rolling with the final reduction degree of 30% and annealing at 800oC for 1h in hydrogen atmosphere. Characterization of the sintered, rolled and annealed samples included the microstructural examination by scanning electron microscopy (SEM), the quantitative analysis of the SEM microphotographs and the examination on tribological properties. Tribological examinations have shown that the best wear resistance have the samples after heat treatment. The significant influence on the tribological properties has the effect of multiple strengthening mechanisms. These mechanisms include strengthening of copper matrix achieved by dispersion of fine particles of Al2O3, strengthening by the grain boundaries due of the appearance of nanosized Al2O3 particles and the CuxAlyOz phase, as well as by deformation strengthening and strengthening by annealing. Based on the results of the quantitative analysis and tribological examinations, it can be concluded that apart from these strengthening effects porosity also has a significant influence on the tribological properties, i.e. reduction of the volume share in porosity improves tribological properties.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "The analysis of the tribological properties of multiple strengthened nanocomposite of the Cu-Al2o3 system",
pages = "55-49",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1830"
}

Korać, M., Kamberović, Ž., Anđić, Z., Tasić, M.,& Vujović, A.. (2011). The analysis of the tribological properties of multiple strengthened nanocomposite of the Cu-Al2o3 system. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 17(1), 49-55.
https://hdl.handle.net/21.15107/rcub_technorep_1830

Korać M, Kamberović Ž, Anđić Z, Tasić M, Vujović A. The analysis of the tribological properties of multiple strengthened nanocomposite of the Cu-Al2o3 system. in Metalurgija. 2011;17(1):49-55.
https://hdl.handle.net/21.15107/rcub_technorep_1830 .

Korać, Marija, Kamberović, Željko, Anđić, Zoran, Tasić, Miloš, Vujović, Aleksandar, "The analysis of the tribological properties of multiple strengthened nanocomposite of the Cu-Al2o3 system" in Metalurgija, 17, no. 1 (2011):49-55,
https://hdl.handle.net/21.15107/rcub_technorep_1830 .

TY  - JOUR
AU  - Korać, Marija
AU  - Kamberović, Željko
AU  - Tasić, Miloš
AU  - Gavrilovski, Milorad
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1343
AB  - This paper is a contribution to characterization of Cu-Al2O3 powders with nanostructure designed for the production of dispersion strengthened contact materials. New materials with predetermined properties can be successfully synthesized by utilizing the principles of hydrometallurgy and powder metallurgy. The results show a development of a new procedure for the synthesis. The applied characterization methods were differential thermal and thermogravimetric analysis (DTA-TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM): Focused Ion Beam (FIB) and Analytical Electron Microscopy (AEM). Nanostructure characteristics, particle size in range 20-50 nm, and uniform distribution of dispersoide in copper matrix were validated.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Nanocomposite powders for new contact materials based on copper and alumina
EP  - 218
IS  - 4
SP  - 215
VL  - 14
DO  - 10.2298/CICEQ0804215K
ER  - 

@article{
author = "Korać, Marija and Kamberović, Željko and Tasić, Miloš and Gavrilovski, Milorad",
year = "2008",
abstract = "This paper is a contribution to characterization of Cu-Al2O3 powders with nanostructure designed for the production of dispersion strengthened contact materials. New materials with predetermined properties can be successfully synthesized by utilizing the principles of hydrometallurgy and powder metallurgy. The results show a development of a new procedure for the synthesis. The applied characterization methods were differential thermal and thermogravimetric analysis (DTA-TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM): Focused Ion Beam (FIB) and Analytical Electron Microscopy (AEM). Nanostructure characteristics, particle size in range 20-50 nm, and uniform distribution of dispersoide in copper matrix were validated.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Nanocomposite powders for new contact materials based on copper and alumina",
pages = "218-215",
number = "4",
volume = "14",
doi = "10.2298/CICEQ0804215K"
}

Korać, M., Kamberović, Ž., Tasić, M.,& Gavrilovski, M.. (2008). Nanocomposite powders for new contact materials based on copper and alumina. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 14(4), 215-218.
https://doi.org/10.2298/CICEQ0804215K

Korać M, Kamberović Ž, Tasić M, Gavrilovski M. Nanocomposite powders for new contact materials based on copper and alumina. in Chemical Industry & Chemical Engineering Quarterly. 2008;14(4):215-218.
doi:10.2298/CICEQ0804215K .

Korać, Marija, Kamberović, Željko, Tasić, Miloš, Gavrilovski, Milorad, "Nanocomposite powders for new contact materials based on copper and alumina" in Chemical Industry & Chemical Engineering Quarterly, 14, no. 4 (2008):215-218,
https://doi.org/10.2298/CICEQ0804215K . .

TY  - JOUR
AU  - Anđić, Zoran M.
AU  - Korać, Marija
AU  - Kamberović, Željko
AU  - Vujović, Aleksandar
AU  - Tasić, Miloš
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1071
AB  - In this paper synthesis of a composite based on Cu-Al2O3 by a thermo-chemical method is shown along with a comparative analysis of the properties of the obtained nanocomposite sintered samples, which are characterized by a good combination of electric-mechanical properties, suitable for work at elevated temperatures. Ultra fine and nanocrystal powder Cu-Al2O3 is obtained by a chemical method, starting from water solutions of nitrates up to achieving the requested composition with 3 and 5% of Al2O3. Synthesis of composite powders has been developed through several stages: drying by spraying, oxidation of the obtained powder of precursor and then reduction by hydrogen until the final composition of nanocomposite powder is achieved. After characterization of the obtained powders, which comprised examination by the Scanning Electronic Microscopy (SEM) method and X-ray-structure analysis (RDA), the powders were compacted with compacting pressure of 500 MPa. Sintering of the obtained samples was performed in the hydrogen atmosphere in isothermal conditions at temperatures of 800 and 900oC for 30, 60, 90 and 120 minutes. Characterization of the obtained Cu-Al2O3 of the nanocomposite sintered system comprised examination of microstructure by the Scanning Electronic Microscopy (SEM), as well as examining of electric mechanical properties. The obtained results show a homogenous distribution of dispersoides in the structure, as well as good mechanical and electric properties. .
AB  - U radu je prikazana sinteza kompozita na bazi Cu-Al2O3 termohemijskim putem uz uporednu analizu svojstava dobijenih nanokompozitnih sinterovanih uzoraka, koje karakteriše dobra kombinacija električna-mehanička svojstva, pogodnih za rad na povišenim temperaturama. Ultra fini i nanokristalni prah Cu-Al2O3 dobijen je hemijskim putem polazeći od vodenih rastvora nitrata do postizanja zahtevanog sastava sa 3 i 5% Al2O3. Sinteza kompozitnih prahova se odvijala kroz nekoliko faza: sušenje raspršivanjem, oksidacija dobijenog praha prekursora i zatim redukcija vodonikom do postizanje konačnog sastava nanokompozitnog praha.Nakon karakterizacije dobijenih prahova, koja je obuhvatila ispitivanja metodom skanirajuće elektronske mikroskopije (SEM) i rendgenostrukturne analize (RDA), vršeno je presovanje prahova pritiskom presovanja od 500 MPa. Sinterovanje dobijenih uzoraka vršeno je u atmosferi vodonika u izotermskim uslovima na temperaturama 800 i 900o C u toku 30, 60, 90 i 120 minuta. Karakterizacija dobijenog Cu-Al2O3 nanokompozitnog sinterovanog sistema je obuhvatila ispitivanja mikrostrukture skanirajućom elektronskom mikroskopijom, kao i ispitivanja električnih i mehaničkih svojstava. Dobijeni rezultati pokazuju homogenu raspodelu disperzoida u strukturi, kao i dobre mehaničke i električne osobine. .
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - Analysis of the properties of a Cu-Al2-O3 sintered system based on ultra fine and nanocomposite powders
EP  - 152
IS  - 2
SP  - 145
VL  - 39
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1071
ER  - 

@article{
author = "Anđić, Zoran M. and Korać, Marija and Kamberović, Željko and Vujović, Aleksandar and Tasić, Miloš",
year = "2007",
abstract = "In this paper synthesis of a composite based on Cu-Al2O3 by a thermo-chemical method is shown along with a comparative analysis of the properties of the obtained nanocomposite sintered samples, which are characterized by a good combination of electric-mechanical properties, suitable for work at elevated temperatures. Ultra fine and nanocrystal powder Cu-Al2O3 is obtained by a chemical method, starting from water solutions of nitrates up to achieving the requested composition with 3 and 5% of Al2O3. Synthesis of composite powders has been developed through several stages: drying by spraying, oxidation of the obtained powder of precursor and then reduction by hydrogen until the final composition of nanocomposite powder is achieved. After characterization of the obtained powders, which comprised examination by the Scanning Electronic Microscopy (SEM) method and X-ray-structure analysis (RDA), the powders were compacted with compacting pressure of 500 MPa. Sintering of the obtained samples was performed in the hydrogen atmosphere in isothermal conditions at temperatures of 800 and 900oC for 30, 60, 90 and 120 minutes. Characterization of the obtained Cu-Al2O3 of the nanocomposite sintered system comprised examination of microstructure by the Scanning Electronic Microscopy (SEM), as well as examining of electric mechanical properties. The obtained results show a homogenous distribution of dispersoides in the structure, as well as good mechanical and electric properties. ., U radu je prikazana sinteza kompozita na bazi Cu-Al2O3 termohemijskim putem uz uporednu analizu svojstava dobijenih nanokompozitnih sinterovanih uzoraka, koje karakteriše dobra kombinacija električna-mehanička svojstva, pogodnih za rad na povišenim temperaturama. Ultra fini i nanokristalni prah Cu-Al2O3 dobijen je hemijskim putem polazeći od vodenih rastvora nitrata do postizanja zahtevanog sastava sa 3 i 5% Al2O3. Sinteza kompozitnih prahova se odvijala kroz nekoliko faza: sušenje raspršivanjem, oksidacija dobijenog praha prekursora i zatim redukcija vodonikom do postizanje konačnog sastava nanokompozitnog praha.Nakon karakterizacije dobijenih prahova, koja je obuhvatila ispitivanja metodom skanirajuće elektronske mikroskopije (SEM) i rendgenostrukturne analize (RDA), vršeno je presovanje prahova pritiskom presovanja od 500 MPa. Sinterovanje dobijenih uzoraka vršeno je u atmosferi vodonika u izotermskim uslovima na temperaturama 800 i 900o C u toku 30, 60, 90 i 120 minuta. Karakterizacija dobijenog Cu-Al2O3 nanokompozitnog sinterovanog sistema je obuhvatila ispitivanja mikrostrukture skanirajućom elektronskom mikroskopijom, kao i ispitivanja električnih i mehaničkih svojstava. Dobijeni rezultati pokazuju homogenu raspodelu disperzoida u strukturi, kao i dobre mehaničke i električne osobine. .",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Analysis of the properties of a Cu-Al2-O3 sintered system based on ultra fine and nanocomposite powders",
pages = "152-145",
number = "2",
volume = "39",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1071"
}

Anđić, Z. M., Korać, M., Kamberović, Ž., Vujović, A.,& Tasić, M.. (2007). Analysis of the properties of a Cu-Al2-O3 sintered system based on ultra fine and nanocomposite powders. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 39(2), 145-152.
https://hdl.handle.net/21.15107/rcub_technorep_1071

Anđić ZM, Korać M, Kamberović Ž, Vujović A, Tasić M. Analysis of the properties of a Cu-Al2-O3 sintered system based on ultra fine and nanocomposite powders. in Science of Sintering. 2007;39(2):145-152.
https://hdl.handle.net/21.15107/rcub_technorep_1071 .

Anđić, Zoran M., Korać, Marija, Kamberović, Željko, Vujović, Aleksandar, Tasić, Miloš, "Analysis of the properties of a Cu-Al2-O3 sintered system based on ultra fine and nanocomposite powders" in Science of Sintering, 39, no. 2 (2007):145-152,
https://hdl.handle.net/21.15107/rcub_technorep_1071 .

TY  - JOUR
AU  - Korać, Marija
AU  - Anđić, Zoran
AU  - Tasić, Miloš
AU  - Kamberović, Željko
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1178
AB  - This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differential thermal and thermogravimetric (DTA-TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20-50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by a homogenous distribution of Al2O3 in a copper matrix. The powders were cold pressed at a pressure of 500 MPa and sintered in a hydrogen atmosphere under isothermal conditions in the temperature range from 800 to 900 °C for up to 120 min. Characterization of the Cu-Al2O3 sintered system included determination of the density, relative volume change, electrical and mechanical properties, examination of the microstructure by SEM and focused ion beam (FIB) analysis, as well as by EDS. The obtained nano-composite, the structure of which was, with certain changes, preserved in the final structure, provided a sintered material with a homogeneous distribution of dispersoid in a copper matrix, with exceptional effects of reinforcement and an excellent combination of mechanical and electrical properties.
AB  - U ovom radu predstavljena je sinteza nano-kompozitnog praha Cu-Al2O3 termohemijskom metodom i sinterovanjem, uz uporednu analizu mehaničkih i električnih svojstava dobijenih čvrstih uzoraka. Nano-kristalni Cu-Al2O3 prahovi dobijeni su termohemijskom metodom u sledećim koracima: sušenje raspršivanjem, oksidacija polaznih prahova, redukcija vodonikom i homogenizacija. Prahovi su okarakterisani analitičkom elektronskom mikroskopijom (AEM) spregnutom sa spektroskopijom energije rasejanja (EDS), diferencijalnom termijskom i termogravimetrijskom analizom (DTA-TGA) i difrakcijom X-zraka (XRD). Veličina čestica dobijenih prahova iznosila je 20-50 nm, uz znatno prisustvo aglomerata. Kompozitni prahovi karakterišu se homogenom raspodelom Al2O3 u bakarnoj matrici. Prahovi su presovani na hladno pritiskom od 500 MPa i sinterovani u atmosferi vodonika pod izotermskim uslovima u temperaturnom opsegu od 800 do 900 °C u trajanju do 120 min. Karakterizacija Cu-Al2O3 sinterovanog sistema uključivala je određivanje gustine, relativne promene zapremine, električnih i mehaničkih svojstava, ispitivanje mikrostrukture tehnikom SEM, analizom pomoću usmerenog jonskog snopa (FIB) i tehnikom EDS. Dobijeni nano-kompozit, čija je struktura, uz izvesne promene, prisutna i u konačnoj strukturi sinterovanog materijala, omogućava homogenu raspodelu disperzoida u bakarnoj matrici sinterovanog materijala, sa izraženim efektima ojačanja, i odličnu kombinaciju mehaničkih i električnih svojstava.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route
T1  - Sinterovanje nano-kompozitnih prahova Cu-Al2O3 dobijenih termohemijskih postupkom
EP  - 1125
IS  - 11
SP  - 1115
VL  - 72
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1178
ER  - 

@article{
author = "Korać, Marija and Anđić, Zoran and Tasić, Miloš and Kamberović, Željko",
year = "2007",
abstract = "This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differential thermal and thermogravimetric (DTA-TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20-50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by a homogenous distribution of Al2O3 in a copper matrix. The powders were cold pressed at a pressure of 500 MPa and sintered in a hydrogen atmosphere under isothermal conditions in the temperature range from 800 to 900 °C for up to 120 min. Characterization of the Cu-Al2O3 sintered system included determination of the density, relative volume change, electrical and mechanical properties, examination of the microstructure by SEM and focused ion beam (FIB) analysis, as well as by EDS. The obtained nano-composite, the structure of which was, with certain changes, preserved in the final structure, provided a sintered material with a homogeneous distribution of dispersoid in a copper matrix, with exceptional effects of reinforcement and an excellent combination of mechanical and electrical properties., U ovom radu predstavljena je sinteza nano-kompozitnog praha Cu-Al2O3 termohemijskom metodom i sinterovanjem, uz uporednu analizu mehaničkih i električnih svojstava dobijenih čvrstih uzoraka. Nano-kristalni Cu-Al2O3 prahovi dobijeni su termohemijskom metodom u sledećim koracima: sušenje raspršivanjem, oksidacija polaznih prahova, redukcija vodonikom i homogenizacija. Prahovi su okarakterisani analitičkom elektronskom mikroskopijom (AEM) spregnutom sa spektroskopijom energije rasejanja (EDS), diferencijalnom termijskom i termogravimetrijskom analizom (DTA-TGA) i difrakcijom X-zraka (XRD). Veličina čestica dobijenih prahova iznosila je 20-50 nm, uz znatno prisustvo aglomerata. Kompozitni prahovi karakterišu se homogenom raspodelom Al2O3 u bakarnoj matrici. Prahovi su presovani na hladno pritiskom od 500 MPa i sinterovani u atmosferi vodonika pod izotermskim uslovima u temperaturnom opsegu od 800 do 900 °C u trajanju do 120 min. Karakterizacija Cu-Al2O3 sinterovanog sistema uključivala je određivanje gustine, relativne promene zapremine, električnih i mehaničkih svojstava, ispitivanje mikrostrukture tehnikom SEM, analizom pomoću usmerenog jonskog snopa (FIB) i tehnikom EDS. Dobijeni nano-kompozit, čija je struktura, uz izvesne promene, prisutna i u konačnoj strukturi sinterovanog materijala, omogućava homogenu raspodelu disperzoida u bakarnoj matrici sinterovanog materijala, sa izraženim efektima ojačanja, i odličnu kombinaciju mehaničkih i električnih svojstava.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route, Sinterovanje nano-kompozitnih prahova Cu-Al2O3 dobijenih termohemijskih postupkom",
pages = "1125-1115",
number = "11",
volume = "72",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1178"
}

Korać, M., Anđić, Z., Tasić, M.,& Kamberović, Ž.. (2007). Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 72(11), 1115-1125.
https://hdl.handle.net/21.15107/rcub_technorep_1178

Korać M, Anđić Z, Tasić M, Kamberović Ž. Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route. in Journal of the Serbian Chemical Society. 2007;72(11):1115-1125.
https://hdl.handle.net/21.15107/rcub_technorep_1178 .

Korać, Marija, Anđić, Zoran, Tasić, Miloš, Kamberović, Željko, "Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route" in Journal of the Serbian Chemical Society, 72, no. 11 (2007):1115-1125,
https://hdl.handle.net/21.15107/rcub_technorep_1178 .

TY  - JOUR
AU  - Gavrilovski, Milorad
AU  - Tasić, Miloš
AU  - Kamberović, Željko
AU  - Pavlović, Jelena
AU  - Sekulić, Živko
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/665
AB  - In this paper detailed characterization of ferriferous dust and mud which originated from aglomerization, blast- furnace and converter process in Iron-works Smederevo were shown. Optimization of method peletization was conducted in variably conditions (different moinsture content, changing of time of peletization and type of binder). These palets were submitted to examination of resistance on impact and pressure, and their behavior was confirmed returning in sintering process in semiindustrial conditions. Ideally-technological solution for plant preparation of dust and mud in Iron-works Smederevo was recommended. That solution should contribute to improvement of techno-economic parameters of aglomeration and blast- furnace process, as well as solution of ecological problem.
AB  - U radu su prikazani rezultati detaljne karakterizacije prašina i muljeva aglomeracionog, visokopećnog i konvertorskog procesa Železare Smederevo. Optimizirana je njihova priprema postupkom peletizacije u promenljivim uslovima (različiti sadržaji vlage, promena vremena peletiziranja i vrste veziva) u cilju vraćanja u primarne procese svih korisnih komponenti koje sadrže. Dobijene pelete su podvrgnute ispitivanjima otpornosti na udar i pritisak. Utvrđena je njihova pogodnost za sinterovanje u poluindustrijskim uslovima. Predloženo je idejno tehnološko rešenje izgradnje postrojenja za pripremu prašina i muljeva u Železari Smederevo, koje bi trebalo da doprinese poboljšanju tehno-ekonomskih parametara aglomeracionog i visokopećnog procesa, uz istovremeno rešavanje ekološkog problema.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Optimisation of ferriferous dust and mud preparation acts from iron and steel production on purpose of returning to primary processes
T1  - Optimizacija postupaka pripreme železonosnih prašina i muljeva iz proizvodnje gvožđa i čelika u cilju vraćanja u primarne procese
EP  - 384
IS  - 4
SP  - 371
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_technorep_665
ER  - 

@article{
author = "Gavrilovski, Milorad and Tasić, Miloš and Kamberović, Željko and Pavlović, Jelena and Sekulić, Živko",
year = "2004",
abstract = "In this paper detailed characterization of ferriferous dust and mud which originated from aglomerization, blast- furnace and converter process in Iron-works Smederevo were shown. Optimization of method peletization was conducted in variably conditions (different moinsture content, changing of time of peletization and type of binder). These palets were submitted to examination of resistance on impact and pressure, and their behavior was confirmed returning in sintering process in semiindustrial conditions. Ideally-technological solution for plant preparation of dust and mud in Iron-works Smederevo was recommended. That solution should contribute to improvement of techno-economic parameters of aglomeration and blast- furnace process, as well as solution of ecological problem., U radu su prikazani rezultati detaljne karakterizacije prašina i muljeva aglomeracionog, visokopećnog i konvertorskog procesa Železare Smederevo. Optimizirana je njihova priprema postupkom peletizacije u promenljivim uslovima (različiti sadržaji vlage, promena vremena peletiziranja i vrste veziva) u cilju vraćanja u primarne procese svih korisnih komponenti koje sadrže. Dobijene pelete su podvrgnute ispitivanjima otpornosti na udar i pritisak. Utvrđena je njihova pogodnost za sinterovanje u poluindustrijskim uslovima. Predloženo je idejno tehnološko rešenje izgradnje postrojenja za pripremu prašina i muljeva u Železari Smederevo, koje bi trebalo da doprinese poboljšanju tehno-ekonomskih parametara aglomeracionog i visokopećnog procesa, uz istovremeno rešavanje ekološkog problema.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Optimisation of ferriferous dust and mud preparation acts from iron and steel production on purpose of returning to primary processes, Optimizacija postupaka pripreme železonosnih prašina i muljeva iz proizvodnje gvožđa i čelika u cilju vraćanja u primarne procese",
pages = "384-371",
number = "4",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_technorep_665"
}

Gavrilovski, M., Tasić, M., Kamberović, Ž., Pavlović, J.,& Sekulić, Ž.. (2004). Optimisation of ferriferous dust and mud preparation acts from iron and steel production on purpose of returning to primary processes. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 10(4), 371-384.
https://hdl.handle.net/21.15107/rcub_technorep_665

Gavrilovski M, Tasić M, Kamberović Ž, Pavlović J, Sekulić Ž. Optimisation of ferriferous dust and mud preparation acts from iron and steel production on purpose of returning to primary processes. in Metalurgija. 2004;10(4):371-384.
https://hdl.handle.net/21.15107/rcub_technorep_665 .

Gavrilovski, Milorad, Tasić, Miloš, Kamberović, Željko, Pavlović, Jelena, Sekulić, Živko, "Optimisation of ferriferous dust and mud preparation acts from iron and steel production on purpose of returning to primary processes" in Metalurgija, 10, no. 4 (2004):371-384,
https://hdl.handle.net/21.15107/rcub_technorep_665 .

TY  - JOUR
AU  - Živanović, Predrag
AU  - Zdujić, Miodrag
AU  - Kamberović, Željko
AU  - Tasić, Miloš
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/666
AB  - Mechanically induced self-propagating reaction in planetary ball mill was realized in three different systems, CaWO4 (scheelite) + Mg, CuO + Ti and CuO + Zr. An influence of a ball diameter (from 5 to 41.2 mm) at three different angular velocities (170, 200 and 230 min" ) on the ignition time (time required for initiating reaction by self-propagating combustion wave) was investigated. A significant influence of mechanochemical treatment parameters to the ignition time was observed. Generally, increasing angular velocity of the supported disc and ball diameter up to 16mm causes shortening of the ignition time to initiate reaction. Further increasing of ball diameter have no significant effect on time needed to initiate the reaction. Ignition time show exponential decay as a function of the kinetic energy of single ball. Changes in chemical composition, structure and morphology was examined by X-ray diffraction and scanning electron microscopy. The tungsten powder was obtained by leaching reaction products of the system CaWO4+Mg. Existence of spherical copper particles in reaction products in either CuO+Ti and CuO+Zr system indicates that reaction temperature exceeds the melting temperature of copper.
AB  - Mehanički je inicirana samorasprostiruća reakcija u planetarnom mlinu u tri različita sistema, CaWO4 (šelit) + Mg, CuO + Ti i CuO + Zr. Ispitan je uticaj prečnika kugli (od 5 do 41,2 mm) pri tri različite ugaone brzine osnovnog diska (170, 200 i 230 min" ) na vreme iniciranja reakcije (vreme potrebno da se inicira reakcija samo-rasprosturućeg talasa sagorevanja). Primećen je znatan uticaj parametara mehano-hemijskog tretmana na vreme neophodno za iniciranje reakcije. Generalno, povećanje brzine obrtanja osnovnog diska i prečnika kugli do 16 mm dovodi do skraćenja vremena potrebnog za iniciranje reakcije. Dalje povećanje prečnika kugli nema značajnijeg uticaja na vreme potrebno za iniciranje reakcije. Vreme iniciranja je pokazalo eksponencijalnu opadajuću zavisnost od kinetičke energije pojedinačne kugle. Promene u hemijskom sastavu, strukturi i morfologiji praćene su rentgenskom difrakcijom i skanirajućom elektronskom mikroskopijom. Prah volframa dobijen je luženjem produkata reakcije sistema CaWO4 + Mg. Prisustvo sfernih čestica bakra u produktima reakcija u sistemima CuO + Ti i CuO + Zr ukazuje da reakciona temperatura premašuje temperaturu topljenja bakra.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Influence of milling parameters on the preparation of fine tungsten and copper powders by mechanically induced self-propagating reaction
T1  - Uticaj parametara mlevenja na dobijanje finih prahova volframa i bakra mehanički iniciranom samorasprostirućom reakcijom
EP  - 352
IS  - 4
SP  - 343
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_technorep_666
ER  - 

@article{
author = "Živanović, Predrag and Zdujić, Miodrag and Kamberović, Željko and Tasić, Miloš",
year = "2004",
abstract = "Mechanically induced self-propagating reaction in planetary ball mill was realized in three different systems, CaWO4 (scheelite) + Mg, CuO + Ti and CuO + Zr. An influence of a ball diameter (from 5 to 41.2 mm) at three different angular velocities (170, 200 and 230 min" ) on the ignition time (time required for initiating reaction by self-propagating combustion wave) was investigated. A significant influence of mechanochemical treatment parameters to the ignition time was observed. Generally, increasing angular velocity of the supported disc and ball diameter up to 16mm causes shortening of the ignition time to initiate reaction. Further increasing of ball diameter have no significant effect on time needed to initiate the reaction. Ignition time show exponential decay as a function of the kinetic energy of single ball. Changes in chemical composition, structure and morphology was examined by X-ray diffraction and scanning electron microscopy. The tungsten powder was obtained by leaching reaction products of the system CaWO4+Mg. Existence of spherical copper particles in reaction products in either CuO+Ti and CuO+Zr system indicates that reaction temperature exceeds the melting temperature of copper., Mehanički je inicirana samorasprostiruća reakcija u planetarnom mlinu u tri različita sistema, CaWO4 (šelit) + Mg, CuO + Ti i CuO + Zr. Ispitan je uticaj prečnika kugli (od 5 do 41,2 mm) pri tri različite ugaone brzine osnovnog diska (170, 200 i 230 min" ) na vreme iniciranja reakcije (vreme potrebno da se inicira reakcija samo-rasprosturućeg talasa sagorevanja). Primećen je znatan uticaj parametara mehano-hemijskog tretmana na vreme neophodno za iniciranje reakcije. Generalno, povećanje brzine obrtanja osnovnog diska i prečnika kugli do 16 mm dovodi do skraćenja vremena potrebnog za iniciranje reakcije. Dalje povećanje prečnika kugli nema značajnijeg uticaja na vreme potrebno za iniciranje reakcije. Vreme iniciranja je pokazalo eksponencijalnu opadajuću zavisnost od kinetičke energije pojedinačne kugle. Promene u hemijskom sastavu, strukturi i morfologiji praćene su rentgenskom difrakcijom i skanirajućom elektronskom mikroskopijom. Prah volframa dobijen je luženjem produkata reakcije sistema CaWO4 + Mg. Prisustvo sfernih čestica bakra u produktima reakcija u sistemima CuO + Ti i CuO + Zr ukazuje da reakciona temperatura premašuje temperaturu topljenja bakra.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Influence of milling parameters on the preparation of fine tungsten and copper powders by mechanically induced self-propagating reaction, Uticaj parametara mlevenja na dobijanje finih prahova volframa i bakra mehanički iniciranom samorasprostirućom reakcijom",
pages = "352-343",
number = "4",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_technorep_666"
}

Živanović, P., Zdujić, M., Kamberović, Ž.,& Tasić, M.. (2004). Influence of milling parameters on the preparation of fine tungsten and copper powders by mechanically induced self-propagating reaction. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 10(4), 343-352.
https://hdl.handle.net/21.15107/rcub_technorep_666

Živanović P, Zdujić M, Kamberović Ž, Tasić M. Influence of milling parameters on the preparation of fine tungsten and copper powders by mechanically induced self-propagating reaction. in Metalurgija. 2004;10(4):343-352.
https://hdl.handle.net/21.15107/rcub_technorep_666 .

Živanović, Predrag, Zdujić, Miodrag, Kamberović, Željko, Tasić, Miloš, "Influence of milling parameters on the preparation of fine tungsten and copper powders by mechanically induced self-propagating reaction" in Metalurgija, 10, no. 4 (2004):343-352,
https://hdl.handle.net/21.15107/rcub_technorep_666 .

TY  - JOUR
AU  - Gavrilovski, Milorad
AU  - Tasić, Miloš
AU  - Kamberović, Željko
AU  - Pavlović, Jelena
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/671
AB  - A new technology for the manufacture of a borer by alumino-thermal method, system design for performing alumino-thermal reaction, as well as required quality of termite steel, is disclosed in this paper. In addition to this, the comparative results concerning manufactured borers quality obtained by this technology in exploitation conditions, at the BF Plant, and results attained by applying traditional technology, have been presented in this paper too. A brief economic evaluation of the new solution has been given. Thereby, savings have not been taken into consideration, achieved by improving the iron notch quality and increasing the BF operation efficiency.
AB  - U okviru ovog rada prikazanje aluminotermijski postupak izrade i zavarivanja vrha tela burgije koje se koriste za otvaranje visoke peći tokom ispuštanja gvožđa, kao i zavarivanje zaostalih komada čeličnog šipkastog materijala tela burgija prečnika 40mm, u cilju reciklaže istim postupkom. U tom cilju projektovana su dva tipa aluminotermijskih mešavina i to: Pyrkonit-VB, čijom se reakcijom dobija termitni čelik, zadatih karakteristika, koji se izliva u kalupni prostor vrha burgije koji se istovremeno zavaruje za telo, Pyrkonit-TB, kojom se zavaruju zaostali, nakon izrade otvora, nerastopljeni komadi tela burgija, u cilju reciklaže. Na osnovu proračuna ulivnog sistema definisana je tehnologija izlivanja termitnog čelika iz odgovarajućih reakcionih lonaca koji su ujedno i kalupi. Date su karakteristike zavarenih spojeva i uporedni rezultati primene izrađenih burgija ovom tehnologijom, u industrijskim uslovima na Visokoj peći Sartid Smederevo sa rezultatima primene tradicionalne tehnologije-kovane burgije (oko 600 komada mesečno). Prikazana je kraća ekonomska ocena novog rešenja, pri čemu nisu uzete u obzir indirektne uštede koje se ostvaruju povećanjem efikasnosti rada visoke peći.
PB  - Institut za istrazivanja i projektovanja u privredi
T2  - Journal of Applied Engineering Science
T1  - A new technological solution for the manufacture of a borer for iron notch opening at the blast furnace plant
T1  - Primena aluminotermijskog postupka izrade i zavarivanja vrha burgija koje se koriste za otvoranje visoke peći tokom ispusta gvožđa
EP  - 48
IS  - 6
SP  - 43
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_technorep_671
ER  - 

@article{
author = "Gavrilovski, Milorad and Tasić, Miloš and Kamberović, Željko and Pavlović, Jelena",
year = "2004",
abstract = "A new technology for the manufacture of a borer by alumino-thermal method, system design for performing alumino-thermal reaction, as well as required quality of termite steel, is disclosed in this paper. In addition to this, the comparative results concerning manufactured borers quality obtained by this technology in exploitation conditions, at the BF Plant, and results attained by applying traditional technology, have been presented in this paper too. A brief economic evaluation of the new solution has been given. Thereby, savings have not been taken into consideration, achieved by improving the iron notch quality and increasing the BF operation efficiency., U okviru ovog rada prikazanje aluminotermijski postupak izrade i zavarivanja vrha tela burgije koje se koriste za otvaranje visoke peći tokom ispuštanja gvožđa, kao i zavarivanje zaostalih komada čeličnog šipkastog materijala tela burgija prečnika 40mm, u cilju reciklaže istim postupkom. U tom cilju projektovana su dva tipa aluminotermijskih mešavina i to: Pyrkonit-VB, čijom se reakcijom dobija termitni čelik, zadatih karakteristika, koji se izliva u kalupni prostor vrha burgije koji se istovremeno zavaruje za telo, Pyrkonit-TB, kojom se zavaruju zaostali, nakon izrade otvora, nerastopljeni komadi tela burgija, u cilju reciklaže. Na osnovu proračuna ulivnog sistema definisana je tehnologija izlivanja termitnog čelika iz odgovarajućih reakcionih lonaca koji su ujedno i kalupi. Date su karakteristike zavarenih spojeva i uporedni rezultati primene izrađenih burgija ovom tehnologijom, u industrijskim uslovima na Visokoj peći Sartid Smederevo sa rezultatima primene tradicionalne tehnologije-kovane burgije (oko 600 komada mesečno). Prikazana je kraća ekonomska ocena novog rešenja, pri čemu nisu uzete u obzir indirektne uštede koje se ostvaruju povećanjem efikasnosti rada visoke peći.",
publisher = "Institut za istrazivanja i projektovanja u privredi",
journal = "Journal of Applied Engineering Science",
title = "A new technological solution for the manufacture of a borer for iron notch opening at the blast furnace plant, Primena aluminotermijskog postupka izrade i zavarivanja vrha burgija koje se koriste za otvoranje visoke peći tokom ispusta gvožđa",
pages = "48-43",
number = "6",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_technorep_671"
}

Gavrilovski, M., Tasić, M., Kamberović, Ž.,& Pavlović, J.. (2004). A new technological solution for the manufacture of a borer for iron notch opening at the blast furnace plant. in Journal of Applied Engineering Science
Institut za istrazivanja i projektovanja u privredi., 2(6), 43-48.
https://hdl.handle.net/21.15107/rcub_technorep_671

Gavrilovski M, Tasić M, Kamberović Ž, Pavlović J. A new technological solution for the manufacture of a borer for iron notch opening at the blast furnace plant. in Journal of Applied Engineering Science. 2004;2(6):43-48.
https://hdl.handle.net/21.15107/rcub_technorep_671 .

Gavrilovski, Milorad, Tasić, Miloš, Kamberović, Željko, Pavlović, Jelena, "A new technological solution for the manufacture of a borer for iron notch opening at the blast furnace plant" in Journal of Applied Engineering Science, 2, no. 6 (2004):43-48,
https://hdl.handle.net/21.15107/rcub_technorep_671 .