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新的铜 -石墨系列复合材料 ( CGCM)提高了导电率和摩擦性能 ,无须润滑。本文介绍的材料是用粉末冶金 ( P/M)法制备的、其密度高于其它 P/M制备的接触材料。新材料不同于用作接触的其它烧结型碳 -铜复合材料 ( CCM)。在碳 -铜复合材料中加入了中间合金 ,以便将碳导入铜相中 ,结果由于铜基体的硬化而造成高的电接触阻力和 /或接触副的高磨损。 CGCM具有自润滑功能。在无润滑的 1 3.5 N恒定法向载荷下进行磨损试验时 ,摩擦因数从 0 .2 2 0降到 0 .1 85。CGCM对铜的磨损机理被认为是随复合材料的变化而改变的综合机理。其试样对纯铜的磨损率也非常低。基于这些性能 ,新材料应用在受电弓、接触电刷和其它电接触部件中具有明显的优点
The new copper-graphite composites (CGCM) increase conductivity and friction without lubrication. The material presented here is prepared by the powder metallurgy (P / M) process and has a higher density than the contact materials made with other P / M. The new material is different from other sintered carbon-copper composites (CCMs) used as contacts. An intermediate alloy is added to the carbon-copper composite material to introduce the carbon into the copper phase, resulting in high electrical contact resistance and / or high wear of the contact pair due to the hardening of the copper matrix. CGCM has a self-lubricating function. The friction factor decreased from 0.220 to 0.185 when subjected to a wear test at a constant normal load of 1 3.5 N without lubrication. The wear mechanism of CGCM to copper is considered as a comprehensive mechanism that changes with the composite material. The sample wear rate of pure copper is also very low. Based on these properties, the new materials have obvious advantages for use in pantographs, contact brushes and other electrical contact components