Abstract:The wear resistance of plastic ring plays an important role in composite seal.In order to select suitable anti-friction materials,this paper studied the micro-friction and wear of QT500 with five kinds of high molecular weight polyethylene (UHMWPE),PTFE+40% copper powder,PTFE+7% carbon fiber,PTFE+7% carbon fiber +5%MoS2,polyether ether ketone (PEEK).Two materials,PTFE+7% carbon fiber and UHMWPE,were screened out for comparative experiments under different fretting stroke and lubrication conditions.The results show that the average friction coefficient of UHMWPE material increases with the increase of fretting stroke under both dry friction and oil lubrication conditions,and the friction coefficient of PTFE+7% carbon fiber material has little fluctuation with the number of cycles when it reaches a stable state.According to the test results,PTFE+7% carbon fiber is recommended when the fretting stroke is less than or equal to 0.2 mm,and UHMWPE is recommended when the fretting stroke is greater than 0.2 mm.
