Tribological Properties and Failure Analysis of PTFE Composites used for Seals in the Transmission Unit  

作　　者：宫燃 WAN Xiaojin ZHANG Xuerong 

机构地区：[1]School of Automotive and Traffic Engineering, Jiangsu University [2]School of Automotive Engineering, Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2013年第1期26-30,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(Nos.51005104, 51105288);Jiangsu Province Basic Research Program(Natural Science Foundation) (No.BK2011477);China Postdoctoral Science Foundation(No.20110491355);Young Excellent Teachers Training Project of Jiangsu University

摘　　要：The sealing rings are one of the most important components as the sealing devices in the wet clutch unit of a heavy vehicle. The sealing ring, made from PTFE composites, was subjected to serious wear on the sealing surface, but the mating metal surface only had slight abrasion. A specialized test rig was designed for wear research and failure analysis of the sealing ring. The composition analyses of the ring material, working conditions and wear surface characteristics by visual inspection and tribological properties as well as microscopic analysis with scanning electron microscope was performed to determine the wear mechanism and failure causes. Results revealed that the wear of PTFE composites was characterized by abrasion and adhesion after a certain duration testing, and the wear mechanism changed to thermal fatigue and abrasive wear in the stage of intense wear. The thermal deformation and fatigue were primarily responsible for the rapid wear of the PTFE composites for the sealing rings.The sealing rings are one of the most important components as the sealing devices in the wet clutch unit of a heavy vehicle. The sealing ring, made from PTFE composites, was subjected to serious wear on the sealing surface, but the mating metal surface only had slight abrasion. A specialized test rig was designed for wear research and failure analysis of the sealing ring. The composition analyses of the ring material, working conditions and wear surface characteristics by visual inspection and tribological properties as well as microscopic analysis with scanning electron microscope was performed to determine the wear mechanism and failure causes. Results revealed that the wear of PTFE composites was characterized by abrasion and adhesion after a certain duration testing, and the wear mechanism changed to thermal fatigue and abrasive wear in the stage of intense wear. The thermal deformation and fatigue were primarily responsible for the rapid wear of the PTFE composites for the sealing rings.

关 键 词：PTFE composite tribological properties SEALS failure analysis thermal effects 

分 类 号：TB332[一般工业技术—材料科学与工程] TH117.1[机械工程—机械设计及理论]