聚酰亚胺填充PTFE复合材料摩擦学性能的研究  

Friction and wear properties of PTFE composites filled with different mix materials made of polyimide and graphite

作　　者：王建吉 刘涛[2] WANG Jianji;LIU Tao(Mechanical and Electronic Engineering Department,Longdong University,Qingyang 745000,China;School of Mechanical and Electrical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]陇东学院机械工程学院,甘肃庆阳7450001 [2]兰州理工大学机电工程学院,兰州730050

出　　处：《功能材料》2018年第9期9072-9077,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51665035);陇东学院博士基金资助项目(XYBY1605)

摘　　要：将聚酰亚胺(PI)、石墨和铜粉按照不同比例混合填充聚四氟乙烯(PTFE)形成新的复合材料,分别在MMU-2端面摩擦磨损试验机上进行摩擦性能测试,并将磨损后的试样在JSM-5600LV扫描电子显微镜下观察摩擦表面的磨痕和复合材料的转移情况,确定出最佳配比。为了研究试验条件对材料摩擦学性能的影响,对最佳配比PTFE基复合材料通过改变试验条件再次进行试验。结果表明,聚酰亚胺可增强填充PTFE的耐磨性,Cu可增加转移膜与对偶件结合的强度,而石墨有利于转移膜的形成;当PI的质量分数为25%,石墨质量分数为5%,Cu粉质量分数为5%时,材料的摩擦学性能表现最好;当滑动速度>4.5m/s,载荷>300N时,试样表面温度均大于120℃,复合材料进入高温摩擦阶段,摩擦表面发生蠕变,转移膜出现灼烧现象。Polyimide(PI),graphite and copper powder mixed in different proportion filled polytetrafluoroethylene(PTFE)to form a new composite material,respectively in MMU-2 friction and wear testing machine for tribological performance tests,and will wear after sample in JMS-5600 scanning electron microscope observation of friction surface grinding crack and transfer of composite materials,and determine the best proportion.In order to study the influence of test conditions on the tribological properties of materials,the optimal ratio of PTFE matrix composites was tested again by changing test conditions.The results show that polyimide can enhance the wear resistance of PTFE,and increase the strength of the transfer film binding to the dual parts.When the mass fraction of PI is 25%,graphite mass fraction is 5%,and Cu powder mass fraction is 5%,the tribological performance of the material is the best.When the sliding velocity is more than 4.5 m/s,the load is greater than 300 N,the sample surface temperature were greater than 120℃,composite material has entered into the phase of high temperature and friction,the friction surface creep,transfer film a burning phenomenon.

关 键 词：聚四氟乙烯 聚酰亚胺 石墨 试验 摩擦学性能 

分 类 号：TH455[机械工程—机械制造及自动化]