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Vojnotehnički glasnik
2014, vol. 62, br. 3, str. 7-25
jezik rada: engleski
vrsta rada: izvorni naučni članak
doi:10.5937/vojtehg62-3962


Uticaj protoka plazma gasa helijuma na svojstva WC-12 wt.%Co prevlake naprskane atmosferskom plazmom
Institut za mikrotalasnu tehniku i elektroniku / IMTEL, Beograd

e-adresa: miki@insimtel.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

Kermet prevlake WC-12tež.%Co intenzivno se koriste za poboljšanje otpornosti na habanje širokog spektra tehničkih komponenti. U radu je analiziran uticaj protoka plazma gasa helijuma na mikrostrukturu i mehaničke karakteristike WC-12tež.%Co prevlaka deponovanih plazmasprej postupkom na atmosferskom pritisku (APS). Radi dobijanja homogenih i gušćih prevlaka u istraživanju su se koristila tri različita protoka He od 8 l/min., 16 l/min. i 32 l/min. Sa primenom He prevlake postižu veće vrednosti mikrotvrdoće zbog manje razgradnje primarnog karbida WC. Glavni cilj bio je da se deponuju gusti i homogeni slojevi WC- 12tež.%Co prevlake sa poboljšanom otpornošću na habanje za različite aplikacije. Rezultati ispitivanja mikrostrukture slojeva procenjeni su na svetlosnom mikroskopu. Mikrostrukturna analiza i mehaničke karakteristike deponovanih slojevima urađene su u skladu sa standardom Pratt- Whitney. Morfologija čestica praha i mikrostruktura najbolje prevlake urađena je na SEM-u (skening elektronskom mikroskopu). Procena mehaničkih karakteristika slojeva urađena je ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje. Istraživanje je pokazalo da protok plazma gasa He bitno utiču na mikrostrukturu i mehaničke osobine i strukture WC-12tež.%Co prevlake.

Ključne reči

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