摘要
研究了石墨、二氧化硅在铜基摩擦材料基体中的摩擦磨损行为。研究结果表明:在添加石墨及添加石墨与SiO_2后的2种材料中,摩擦因数随着转速的加快而减小,前者的磨损量随转速的提高而增加,后者的磨损量则呈相反的变化趋势。基体中加入石墨,当转速不同时,材料的磨损机理也不同。低转速时主要发生粘着和犁削现象,当转速加快后材料的磨损以犁削和剥层脱落为主,高转速时则出现了氧化磨损。高转速时石墨在摩擦表面被碾成一薄层,与表面塑性变形金属和磨屑形成多层叠加结构,削弱了表层与基底的结合强度,容易发生层状剥落;基体中加入石墨与二氧化硅后,在较低转速时材料以磨粒磨损为主,高转速时则伴随有少量氧化磨损发生,石墨在摩擦表面不形成多层叠加结构,表面膜上的裂纹是导致表面膜脱落的主要原因。
The friction and wear behavior of graphite and SiO_2 in the matrix of Cu-based friction materials were investigated in this paper. The results show that the frictional coefficient of the materials descendes with the increase of rotational speeds, but the wear mechanism are different in these two kinds of materials; when graphite is added, the wear mechanism also changes at different rotational speeds; the graphite and deformed metals on the surface form a sandwich that have several layers. The wear mechanism changes when SiO_2 is added into the matrix, the sandwich cannot be formed because SiO_2 debris have effects on it, the microcracks make the film fall from the surface.
出处
《粉末冶金材料科学与工程》
EI
2003年第3期252-259,共8页
Materials Science and Engineering of Powder Metallurgy
关键词
铜基摩擦材料
摩擦磨损性能
磨损机理
Cu-based friction material
friction and wear properties
wear mechanism
