聚全氟乙丙烯的微动磨损

研究了球－盘点接触和面接触微动条件下聚全氟乙丙烯（以下简称ＦＥＰ）的微动磨损特性。发现球－盘接触对ＦＥＰ的微动磨损以带状磨屑挤出为主。而常规负荷条件下的球－盘接触形式并不适合于研究聚合物的微动磨损。采用面接触形式可以显著降低接触应力，同时也便于对聚合物微动表面的观测。结果表明，在面接触条件下，ＦＥＰ的微动损伤表面可明显地分成３个区：中心区为磨屑产生区；高应力区为磨屑阻挡区；阻挡区之外为轻微滑动区，

The Fretting Wear Characteristics of FEP

The fretting wear mechanisms of perfluorinated ethylene propylene copolymer (FEP) were studied on an SRV fretting wear tester with ball on disk point contact and plane contact respectively. It was suggested that ball on disk contact was not suitable for the study of fretting wear behaviors of polymers as the hertzian pressure was much higher than the compression yield strength of polymer and the polymer would be extruded out of the contact regions. In the case of plane contact, on the worn surface of FEP and the transfer film on counterpart metal surface, three regions including wear debris formation region, high stress region, and slightly sliding wear region could be distinguished. The fatigue cracks were produced in subsurface region about 0.5 mm beneath the contact surface of FEP. It was concluded that the fretting wear mechanism of FEP was the combination of surfacial adhesion wear and sub surfacial fretting fatigue.