SiC和石墨混杂增强铜基复合材料的高温摩擦磨损特性研究  

Tribological Characteristics of Copper Hybrid Composite at Elevated Temperature

作　　者：湛永钟[1] 张国定[2] 曾建民[1] 庄应烘[1] 

机构地区：[1]广西大学有色金属材料及其加工新技术教育部重点实验室,广西南宁530004 [2]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《摩擦学学报》2006年第3期223-227,共5页Tribology

基　　金：广西自然科学基金资助项目(桂科青0542011);广西"新世纪十百千人才工程"专项基金资助项目[桂政发(2005)59号];广西高校百名中青年学科带头人资助项目(2005)

摘　　要：采用MMU-5G型端面摩擦磨损试验机研究了SiC和石墨颗粒混杂增强铜基复合材料在250～400℃与GCr15钢对摩时的高温摩擦磨损特性，并与SiC/Cu复合材料进行对比分析．结果表明：加入石墨颗粒可以降低复合材料和偶件GCr15钢的磨损率，获得低而稳定的摩擦系数；同时，有效防止高温条件下严重粘着转移现象的发生，使得在400℃下混杂复合材料仍具有较低的磨损率．这是由于在混杂增强铜基复合材料的高温磨损表面上通过“磨屑机械混合→热压”的机制形成了连续的富石墨机械混合层，而对磨损表面起到良好的固体润滑作用，使得SiC和石墨混杂增强铜基复合材料具有良好的高温摩擦磨损特性．Elevated temperature tribological characteristics of copper matrix composite reinforced with SiC and graphite particles were investigated on an MMU-5G wear machine under 250 -400 ℃, and compared with SiC/Cu eomposite. Results show that addition of graphite partieles eould deerease the wear rate of both the hybrid eomposite and the counterpart, while keep the friction coefficient low and stable. Severe adhesive transfer was effectively prevented, therefore low wear rate was maintained until 400 ℃. A continuous graphite-rich mechanically mixing layer was formed on the elevated temperature worn surface in a meehanism of ＇ wear debris mixing＇ to ＇ hot pressing＇. Its solid lubrieity imparted the （ SiC ＋ Gr）/Cu composite with good friction and wear properties at elevated temperatures.

关 键 词：混杂增强 石墨 铜基复合材料 高温摩擦磨损性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TH117.3[金属学及工艺—金属材料]