纳米SiC与PI填充改性PTFE复合材料的摩擦磨损性能  

Tribological Behavior of Nano-SiC/PI Reinforced PTFE Composites

作　　者：米翔 龚俊[1] 曹文翰[1] 王宏刚[2] 任俊芳[2] MI Xiang GONG Jun CAO Wenhan WANG Honggang REN Junfang(School of Mechanical ＆ Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000)

机构地区：[1]兰州理工大学机电工程学院,兰州730050 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000

出　　处：《材料导报》2017年第18期102-108,共7页Materials Reports

基　　金：国家自然科学基金(51165022)

摘　　要：以纳米碳化硅(Nano-SiC)和聚酰亚胺(PI)为填料,经过机械共混、冷压成型和烧结等工艺制备Nano-SiC与PI共同填充改性聚四氟乙烯(PTFE)复合材料。利用MRH-3型环-块摩擦实验机研究不同实验条件下复合材料的摩擦磨损性能并记录磨损表面温度变化。通过扫描电镜观察试样磨损表面和转移膜形貌,分析其磨损机理。结果表明:纳米粒子含量、载荷和速度的变化会引起磨损表面温度发生变化,影响复合材料的摩擦磨损特性,复合材料磨损表面形貌和转移膜形貌也随之改变;随着纳米粒子含量增加,摩擦温升更快进入平稳阶段,有利于降低复合材料的磨损率;载荷由100N增加至400N,速度由1m/s增加至4m/s时,复合材料的摩擦磨损特性大幅下降,磨损表面形貌和转移膜形貌有显著变化,重载和高速条件下复合材料的磨损率高;环境温度在室温到135℃变化时复合材料的摩擦性能变化不明显。Nanometer SiC（Nano-SiC）particles and polyimide（PI）synergetic filled polytetrafluoroethylene（PTFE）composites were prepared by high speed mechanical mixer,cold press molding and sintering with temperature control program.The tribological behavior of composites and the worn surface temperature was tested by a MRH-3 block-on-ring friction and wear tester under different conditions.The worn surface and transfer film were inspected and analyzed with scanning electronic microscopy（SEM）.The results demonstrated that the change of the worn surface temperature,the tribological behavior,the worn surface morphology and the transfer film of composites related to the content of nano-SiC,load and sliding velocity.With the increase content of nanoparticles,the friction temperature rose more quickly into the steady stage,which was helpful to reduce the wear rate of the composite.When the load increased from 100 N to 400 N and the velocity increased from 1 m/s to 4 m/s,the tribological behavior of composites deteriorated quickly,the surface morphology and the transfer film changed significantly.The wear rate of the composites under heavy and high velocity conditions was high.The change of tribological behavior are not obvious within the ambient temperature to 135 ℃.

关 键 词：纳米碳化硅 聚酰亚胺 聚四氟乙烯 摩擦磨损性能 转移膜 温度 

分 类 号：TB332[一般工业技术—材料科学与工程]