偶件表面粗糙度对PTFE密封材料摩擦磨损性能的影响

Effect of the Surface Roughness of Matching Materials on the Friction and Wear Behavior of PTFE

在干摩擦和油润滑条件下,采用MRH-3型高速环块摩擦磨损试验机研究不同粗糙度的45#钢环对PTFE摩擦副摩擦磨损性能的影响,借助白光干涉仪和SEM分析不同试环粗糙度下PTFE磨损后的表面形貌,结合油缸和密封件的工况分析油缸内壁粗糙度对密封材料磨损的原因和机制。结果表明:45#钢环表面粗糙度存在一个最佳的范围,在此范围内摩擦因数均较小;在干摩擦条件下,钢环表面粗糙度过高或过低时,PTFE磨损率均比较大,在油润滑条件下,PTFE磨损率一般随钢环表面粗糙度的增大而升高;粗糙度较大时,PTFE的损伤以犁沟损伤为主。

The effects of 45 steel rings with different roughness on PTFE under oil lubrication and dry fiction were investigated on MRH-3 wear tester.The worn surfaces of PTFE were observed by scanning electron microscopy（SEM）.The results show that there exists a optimal surface roughness range for 45 steel rings,in which PTFE has low friction coefficient.PTFE has high wear rate when the surface roughness of 45 steel rings is too low or too high under dry friction condition,but the wear rate of PTFE increases with the increase of the surface roughness of 45 steel rings under oil lubrication condition.The wear mechanism of PTFE is mainly in the way of furrows.