热塑性聚酰亚胺基摩擦材料研究.pdf

2006全国摩擦学学术会议——纪念摩擦学40周年 热塑性聚酰亚胺基摩擦材料研究 陈震霖，朱鹏，宋艳江，王晓东，黄培 (南京工业大学化学化工学院，南京210009) 摘要： 以自主开发的一种新型热塑性聚酰亚胺为研究对象，采用石墨，二硫化铝、聚四氟乙烯三种 固体润滑剂及其混合物改善其摩擦磨损性能；利用MPX·2000摩擦试验机测定了水润滑下材料的摩擦磨 损性能；采用有限元法模拟材料微凸体摩擦过程中应力分布，结合磨损表面微观形貌，分析磨损机理． 结果表明，高载低速摩擦过程中材料微凸体整体应力较小，磨损以材料多次受力疲劳磨损为主，磨损率 随着弯曲强度的升高而减小．低载高速相比高载低速，材科磨损率大幅度下降，材料微凸体整体应力较 大，偶面微凸体的高速撞击易使材料一次破坏，产生磨损，材料耐磨性能随冲击强度的升高而增强． 关键词：聚酰亚胺；水润滑；摩擦磨损；冲击强度：弯曲强度 中图分类号：THIl7．3 Researchon Materials ThermoplasticPolyimide-basedTribological CHENZhen-linZHU SONG HUANGPei PengⅥ，ANGXiao-dongYan-jiang andChemical University 2lo009，China) (Chemistry EngineeringInstitute，NanjingofTechnology,Nanjing Abstract：AhOVel was wasmodified the thermoplasticpolyimidedeveloped．It by fillers．including behaviorofthe anditS graphite，MoS2，PTFE+MoS2．Thetribological thermoplasticpolyimide was MPX-2000 underwaterlubricationstudied tribo-tester．Thestressdistilbutionof composites by Wassimulated onthesimulationandthe asperityduringsliding byFE(FiniteElement)．Based micro．profile ofthewornsurfaceobservedSEM．thewearmechanismWasdetermined．Theresultindicatesthatunder by and10w 0．75 0．5 iSIittle highloading velocity(pressureMPa，velocitym／s)，there stressinsidethe material continuedinteractionbetween dominatesthewear asperity：fatiguewealby couples’asperities wearratesincreaseswithlower low and mechanism；the