新型C/C-Cu复合滑动导电材料电摩擦磨损行为研究  

Tribological Behavior of a Novel C/C-Cu Sliding Electrical Contact Material

作　　者：杨琳[1] 易茂中[1] 冉丽萍[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《摩擦学学报》2009年第5期458-463,共6页Tribology

基　　金：国家重点基础研究发展(973)计划资助项目(2006CB600906);湖南省重点科技支撑计划资助项目(2007KG2017)

摘　　要：采用无压熔渗工艺制备一种新型的具有自润滑耐磨性能的炭纤维整体织物/炭-铜(C/C-Cu)复合材料,在改装的MM-2000型环-块摩擦磨损试验机上考察其载流摩擦磨损性能,探讨外加直流电对摩擦磨损行为的影响并分析其作用机理.结果表明:电流方向决定了复合材料摩擦面磨屑层存在与否,对摩擦系数有较大影响.正接条件下复合材料的摩擦系数和磨损率高于负接条件下.电流强度对C/C-Cu复合材料磨损率影响较为显著.随电流强度增大,磨损率增大,磨损机制由犁削磨损向黏着磨损转变.摩擦系数随电流强度的增大先升高后降低.C/C - Cu composites were fabricated by infiltrating molten Cu alloy into C/C preforms. The tribological behavior of the composite block against Cu ring was evaluated using an MM - 2000 friction and wear tester. The influences of externally applied electrical factors on tribological behavior of the composite were investigated, and their interacting mechanism was analyzed. The results showed that the direction of current determined the existence or non -existence of wear debris layer, and had much impact on friction coefficient. The friction coefficient and wear rate of the composite under positive direction were higher than that under negative direction. Current intensity had a significant influence on wear rate of the composite. With increasing current intensity, the wear rate increased and wear mechanism changed from ploughing wear to adhesive wear. The friction coefficient increased firstly and then dropped with the rising current intensity.

关 键 词：C/C—Cu复合材料 熔渗 滑动磨损性能 加载电流 

分 类 号：TB331[一般工业技术—材料科学与工程]