摘要
采用石墨、二硫化钼、聚四氟乙烯三种固体润滑剂及其混合物填充改性热塑性聚酰亚胺，测试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，材料磨损率大幅度下降，偶面微凸体的高速撞击下材料微凸体整体应力较大，易一次破坏产生磨损，材料耐磨性能随冲击强度的升高而增强。
The tribological behavior in water of thermoplastic polyimide filled with graphite, MoS2, or PTFE, or their combinations was studied using MPX-2000 tribo-tester. The stress distribution of asperity during sliding was simulated by finite element method. Based on the simulation and the micro-profile of the worn surface observed by SEM, the wear mechanism was proposed. Under high loading and low velocity （pressure 2.0 MPa, velocity 0.5 m/s）, the stress was preferred to concentrate little on the surface to inside the asperity, the wear was caused mainly by fatigue of continued interaction between couples＇ asperities, the wear rates increased with lowering bending strength. Under low loading and high velocity condition （pressure 0.5 MPa, velocity 3.0 m/s）, the wear rate was only 2 % of that in the former case; the stress on the integral asperities was larger, the wear resistance increased with increasing impact strength of the material.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第6期39-43,共5页
China Plastics
基金
江苏省材料摩擦学重点实验室开放基金项目资助（编号kjsmcs04001）
关键词
聚酰亚胺
水润滑
摩擦
磨损
冲击强度
弯曲强度
polyimide
water lubrication
friction
wear
impact strength
bending strength
