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Vojnotehnički glasnik
2015, vol. 63, br. 2, str. 47-63
jezik rada: engleski
vrsta rada: izvorni naučni članak
objavljeno: 02/06/2015
doi: 10.5937/vojtehg63-4324
Mehanička svojstva i mikrostruktura vakuum plazma naprskane Cr3C2 - 25(Ni20Cr) prevlake
Institut za mikrotalasnu tehniku i elektroniku - IMTEL, Beograd

e-adresa: miki@imtelkom.ac.rs

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 radu je analizirana vakuum plazma sprej prevlaka VPS - Cr3C2 - 25(Ni20Cr). Upotrebljen je komercijalni prah oznake Sulzer Metco Woka 7205. Prah je deponovan sa plazma pištoljem F4 na odstojanju substrata od 340 mm. Glavni cilj rada bio je da se na smanjenom pritisku inertnog gasa Ar eliminiše razgradnja primarnog karbida Cr3C2 u karbid Cr23C6 koji bitno umanjuje mikrotvrdoću i mehaničke karakteristike prevlake. Prevlaka je deponovana debljine od 100 do 120 μm na čeličnom substratu. Mikrotvrdoća prevlake ispitana je metodom HV0.3. Vrednosti mikrotvrdoće bile su u rasponu od 1248 do 1342 HV0.3. Čvrstoća spoja prevlake ispitana je metodom na zatezanje. Utvrđeno je da čvrstoća spoja između substrata i prevlake ima vrednost 89 MPa. Mikrostruktura prevlake ispitana je tehnikom svetlosne mikroskopije. Struktura prevlake sastoji se od osnove NiCr legure sa dominantnom primarnom karbidnom fazom Cr3C2. Pored Cr3C2 faze prisutna je i faza Cr7C3. Nagrizanje prevlake urađeno je reagensom 1HNO3: 4HCl: 4H2O koji prvenstveno rastvara Ni da bi se videla raspodela karbidne faze u prevlaci. Nagrizanjem prevlake reagensom utvrđeno je da je u slojevima prevlake u velikom udelu prisutna primarna nerazgrađena karbidna faza Cr3C2 koja prevlaci daje visoke vrednosti mikrotvrdoće.

Ključne reči

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