Effect of La2O3 on electrical friction and wear properties of Cu-graphite composites

被引:0
|
作者
莫飞 [1 ]
凤仪 [1 ]
陈阳明 [1 ]
王雨晴 [1 ]
钱刚 [1 ]
豆亚坤 [1 ]
张学斌 [1 ]
机构
[1] School of Materials Science and Engineering, Hefei University of Technology
基金
中国国家自然科学基金; 国家教育部博士点专项基金资助;
关键词
Cu-La2O3-graphite composites; electrical contacts; contact voltage drop; friction; wear; rare earths;
D O I
暂无
中图分类号
TB333 [金属-非金属复合材料];
学科分类号
0805 ; 080502 ;
摘要
Sliding friction and wear experiments using Cu-La2O3-graphite composites against Cu-5 wt.%Ag alloy ring were conducted at a constant sliding speed of 10 m/s, a current density of 10 A/cm2 and a load of 2.5 N/cm2. These composites with different La2O3 and graphite contents were fabricated by hot-pressing. Physical and mechanical properties of the composites were examined. Morphologies of the worn surface of composites were observed using optical microscopy. X-ray photoelectron spectroscopy spectra were used to study compositions of the lubricating film. The results showed that with the increasing addition of La2O3, hardness, flexural strength and electrical resistivity increased, but the relative density dropped. The friction coefficient increased with the increasing addition of La2O3. Composite containing 3 vol.% of La2O3 and 37 vol.% of graphite showed the best wear resistance. The main wear mechanisms of composites were abrasive wear, oxidative wear and adhesive wear.
引用
收藏
页码:327 / 333
页数:7
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