文章摘要
聚酰亚胺/石墨改性聚四氟乙烯的摩擦学性能
Tribological Properties of Polyimide/Graphite Modified Polytetrafluoroethylene
  
DOI:10.16865/j.cnki.1000-7555.2018.08.011
中文关键词: 聚酰亚胺  石墨  聚四氟乙烯  复合材料  摩擦磨损
英文关键词: polyimide  graphite  polyetrafluoroethylene  composite material  frictional and wear
基金项目:国家自然科学基金资助项目(51665035);陇东学院博士基金(XYBY1605)
作者单位
王建吉1,2, 刘 涛1 1. 兰州理工大学 机电工程学院甘肃 兰州 730050 2. 陇东学院 机械工程学院甘肃 庆阳 745000 
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中文摘要:
      利用MMU-10G端面高温摩擦磨损试验机,对聚酰亚胺(PI)和石墨共混改性聚四氟乙烯(PTFE)复合材料的摩擦学性能进行了测试,利用扫描电镜观察摩擦副表面的磨痕和复合材料的转移情况。同时研究最佳配比PTFE基复合材料在不同试验条件下的摩擦学性能,并测量了摩擦副表面的瞬时温度。结果表明,PI可以大幅度提高填充PTFE的耐磨性能,但PI含量增加不利于非金属转移膜的形成;当PI含量约为25%时,和石墨一起填充PTFE,复合材料的摩擦学性能最佳;当载荷大于300 N和线速度大于4 m/s时,摩擦表温度均高于125 ℃,复合材料进入高温摩擦阶段,摩擦表面发生蠕变,转移膜出现不同程度的破坏;PI填充PTFE复合材料摩擦性能在温度低于75 ℃时变化不明显。
英文摘要:
      The tribological behavior of polyimide(PI)/graphite/polyetrafluoroethylene(PTFE)composites was tested by MMU-10G end face high-temperature friction andwear testing machine. The worn surface and transfer of composite materials were inspected and analyzed by SEM. At the same time, the surface temperature and the tribological behavior of the PTFE matrix composites with the best ratio under different experimental conditions were studied, and the instantaneous temperature of the friction pair surface was measured. The results show that PI could greatly improve the wear resistance of the filled PTFE. However, the increase of PI content is not conducive to the formation of non-metallic transfer film. The best anti-wear performance is obtained when the volume fraction of PI is 25%. The composites enter the high temperature friction stage, when the load exceeds 300 N and the speed overtakes 4 m/s, the temperature of the friction surface is greater than 125 ℃. The friction surface will creep, and the transfer film would be damaged to varying degrees. The change of friction performance of PI filled PTFE composites is not obvious when the temperature is less than 75 ℃.
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