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Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom

dc.creatorMrdak, Mihailo
dc.creatorLačnjevac, Časlav
dc.creatorRakin, Marko
dc.creatorVeljić, Darko
dc.creatorBajić, Nikola
dc.date.accessioned2021-03-10T14:08:35Z
dc.date.available2021-03-10T14:08:35Z
dc.date.issued2019
dc.identifier.issn0351-9465
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/4277
dc.description.abstractMolybdenum 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.en
dc.description.abstractPrevlake 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.sr
dc.publisherEngineering Society for Corrosion, Belgrade, Serbia
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/174004/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/34016/RS//
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceZaštita materijala
dc.subjectMolybdenumen
dc.subjectvacuum plasma spray (VPS)en
dc.subjectmicrostructureen
dc.subjectmicrohardnessen
dc.subjectbond strengthen
dc.subjectMolibdensr
dc.subjectvakuum plazma sprej (VPS)sr
dc.subjectmikrostrukturasr
dc.subjectmikrotvrdoćasr
dc.subjectčvrstoća spojasr
dc.titleMechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray processen
dc.titleMehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesomsr
dc.typearticle
dc.rights.licenseBY-NC-ND
dc.citation.epage276
dc.citation.issue3
dc.citation.other60(3): 271-276
dc.citation.rankM51
dc.citation.spage271
dc.citation.volume60
dc.identifier.doi10.5937/zasmat1903271M
dc.identifier.fulltexthttp://TechnoRep.tmf.bg.ac.rs/bitstream/id/10028/0351-94651903271M.pdf
dc.type.versionpublishedVersion


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