具有正温度系数特性的导电低密度聚乙烯基复合材料的摩擦磨损性能  

Friction and Wear Behaviour of Low-density Polyethylene Matrix Composites with Positive Temperature Coefficient Characteristics

作　　者：董光能[1] 李健[2] 谢友柏[1] 虞烈[1] 

机构地区：[1]西安交通大学润滑理论及轴承研究所,陕西西安710049 [2]武汉材料保护研究所磨损实验室,湖北武汉430030

出　　处：《摩擦学学报》2001年第1期63-66,共4页Tribology

基　　金：国家自然科学基金!资助项目 (5 9475 0 33) ;教育部现代设计及轴承转子系统开放实验室基金!资助项目 (97-0 2 )

摘　　要：采用共混法制备了以低密度聚乙烯为基体的含碳黑的导电复合材料 ,考察了导电复合材料的摩擦磨损性能及正温度系数特性 ,同时探讨了导电复合材料的摩擦熔融现象对其摩擦磨损性能的影响 .结果表明 :当低密度聚乙烯基导电复合材料与 GCr15钢配副时 ,在较高 pv值下 ,摩擦系数呈现周期性降低现象 ;温度对复合材料的导电性能具有重要影响 ,而聚四氟乙烯及聚苯酯等辅助导电剂对其 PTC特性无影响 .Low-density polyethylene (LDPE) matrix conductive composites containing carbon black (CB) were prepared by mold compression. The effect of friction-induced melting on the friction and wear behaviour of the composites was explored. As the results, the electric conductivity of the composite is highly dependent on temperature; the auxiliary electric conductive agents such as polytetrafluoroethylene (PTFE) and ekonol have no effect on the PTC characteristic of the composite. A periodical decrease of the friction coefficient has been observed under a relatively high pv value in sliding of the composite pin against AISI1045 steel disc. This is related to the friction-induced melting of the LDPE matrix during the sliding process.

关 键 词：低密度聚乙烯 复合材料 正温度系数 摩擦磨损性能 电接触器件 

分 类 号：TB332[一般工业技术—材料科学与工程] TM243[电气工程—电工理论与新技术]