摘要
采用粉末冶金技术制备了铜和铜-石墨粉末冶金材料。通过定速摩擦试验机测试了材料的摩擦磨损性能,观察比较了两种材料摩擦学特征和表面摩擦第三体的变化过程。结果表明:摩擦表面第三体状态与材料成分密切相关,并影响材料的摩擦系数和磨损量。纯铜摩擦时,形成的第三体颗粒尺寸大、粘着性强,金属间的粘着撕裂造成摩擦系数剧烈波动和磨损量加大;添加石墨,细化了第三体颗粒尺寸,流动性好的第三体容易覆盖表面的损伤区,这有利于增加真实接触面积,减少应力集中,起到稳定摩擦系数、降低磨损量的作用。
Powder metallurgy techniques were employed to fabricate Cu and Cu-graphite materials, whose friction and wear properties were measured by a constant-speed tester. The tribologieal characteristics and the evolution of the third bodies at the surface were investigated. The results show that the states of third bodies are relevant to the composition and they have effects on the friction coefficients as well as the wear. In case of pure Cu, third bodies have large sizes and the adhesive abrasion occurs between the metals, resulting in oscillation of friction coefficients and a large loss of mass. Adding some graphite, which brings third bodies with good mobility, can refine the size of third bodies. These third bodies cover the interfaces, increase the real contacting areas, reduce the stress concentration, and as a result, stabilize the friction coefficients and reduce the wear.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2008年第4期554-558,共5页
Journal of Materials Science and Engineering
基金
国家863计划资助项目(2006AA03Z515)
国家自然科学基金资助项目(50375025)
关键词
第三体
摩擦磨损
铜石墨烧结材料
third bodies
friction and wear
sintered Cu-graphite
