摘要
采用1 700℃、20 MPa高温高压固相烧结工艺制备WC-0.5Cr3C2-0.3VC、WC-3.65TiC-2.45TaC-0.47Cr3C2-0.28VC和WC-6Mo2C-0.47Cr3C2-0.28VC等3种无金属粘结相硬质合金。采用CHI 660C电化学工作站研究在pH=1的H2SO4溶液、pH=7的Na2SO4溶液和pH=13的NaOH溶液中3种合金的电化学腐蚀行为。结果表明,在pH=1的H2SO4溶液和pH=7的Na2SO4溶液中WC-6Mo2C-0.47Cr3C2-0.28VC合金的耐腐蚀性能最好,在pH=13的NaOH溶液中WC-3.65TiC-2.45TaC-0.47Cr3C2-0.28VC的耐腐蚀性能最好。3种无金属粘结相硬质合金在pH=13的NaOH溶液中的耐腐蚀性能均优于其在pH=1的H2SO4溶液中的耐腐蚀性能。综合比较合金的硬度、耐腐蚀性能以及原材料价格,3种合金中WC-6Mo2C-0.47Cr3C2-0.28VC合金具有更佳的性价比。
The WC-0.5Cr3C2-0.3VC, WC-3.65TiC-2.45TaC-0.47Cr3Cz-0.28VC and WC-6Mo2C-0.47Cr3C2-0.28VC binderless carbides were prepared by solid phase sintering at the temperature of 1 700℃ and pressure of 20 MPa. Electrochemical corrosion behaviors were investigated in H2SO4 solution （pH=l）, Na2SO4 solution （pH=7） and NaOH solution （pH=13）. The results show that, WC-6Mo2C-0.47Cr3C2-0.28VC alloy exhibits the best corrosion resistance in H2SO4 solution （pH=1） and Na2SO4 solution （pH=7）; while, WC-3.65TiC-2.45TaC-0.47Cr3C2-0.28VC alloy exhibits the best corrosion resistance in NaOH solution （pH=13）. All the three alloys exhibit better corrosion resistance in NaOH solution （pH=13） than that in H2SO4 solution （pH=l）. Considering the hardness, corrosion resistance and the cost of the raw materials of the alloys, WC-6Mo2C-0.47Cr3C2-0.28VC alloy is characterized with a higher performance price ratio among all the three alloys.
出处
《粉末冶金材料科学与工程》
EI
2011年第6期820-826,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51074189
50823006)
湖南省科技计划重点项目资助项目(2010FJ2006)
高等学校博士学科点专项科研基金资助项目(20100162110001)
国家科技重大专项资助项目(2009ZX04012-032
2011BAE09B02)
