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Vojnotehnički glasnik
2013, vol. 61, br. 4, str. 26-47
jezik rada: engleski
vrsta rada: izvorni naučni članak
doi:10.5937/vojtehg61-2495
Karakterizacija vakuum plazma naprskane kobalt-nikal-hrom-aluminijum-itrijum prevlake
Institut za mikrotalasnu tehniku i elektroniku / IMTEL, Beograd

e-adresa: drmrdakmihailo@gmail.com

Projekat

Mikromehanički kriterijumi oštećenja i loma (MPNTR - 174004)
Razvoj tehnologije izrade obloge i jezgra na bazi domaćih sirovina za proizvodnju specijalnih obloženih elektroda namenjenih za elektrolučno zavarivanje čelika (MPNTR - 34016)

Sažetak

U ovome radu je analiziran uticaj plazma sprej odstojanja na mikrostrukturu i mehaničke karakteristike Co32Ni21Cr8Al0.5Y prevlaka deponovanih vacuum plazma sprej postupkom (VPS). Mikrostruktura i mehaničke osobine plazma sprej prevlaka su određene interakcijom jona plazme Ar/H2 sa česticama praha pri čemu nastaje prenos brzine i temperature jona na čestice praha. Efekat interakcije je u direktnoj zavisnosti od vremena interakcije jona i čestica praha koji je definisan plazma sprej odstojanjem. Prah je deponovan sa plazma pištoljem F4 sa tri odstojanja substrata 270, 295 i 320 mm. Prevlaka najboljih strukturnih i mahaničkih karakteristika je testirana na oksidaciju u peći za termičku obradu bez zaštitne atmosfere na 1100°C u trajanju od 240 sati. Morfologija čestica praha je ispitana na SEM-u. Mikrostruktura slojeva u deponovanom stanju je ispitana tehnikom svetlosne mikroskopije. Prevlaka najboljih mehaničkih karakteristikama je nagrizena elektrolitički sa 10% oksalne kiseline H2C2O4x2H2O. Analiza mikrostrukture nagrizene prevlake je izvršena na svetlosnom mikroskopu i na SEM-u pre i posle testiranja prevlake na oksidaciju. Mikrostrukturna analiza deponovanih slojevima je urađena u skladu sa standardom Pratt-Whitney. Procena mehaničkih karakteristika slojeva je urađena ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje.

Ključne reči

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