Research on the Effect of Temperature on Tribological Properties of PTFE Composites under Oil Lubrication Conditions

Abstract

PTFE and its composites are widely used in various reciprocating sealing materials due to their extremely low friction coefficient. As pure PTFE has poor wear resistance at high temperature, it is necessary to study the tribological properties of PTFE with different fillers under the condition of high temperature and oil lubrication. The friction and wear properties of PTFE and PTFE composite material filled with bronze powder, carbon powder, carbon fiber, glass fiber and MoS2 powder were studied by standard friction and wear test using SRV-4 tribotester. Results showed that the wear resistance was all improved indicating that the fillers increased the wear resistance of PTFE, PTFE composite filled with MoS2 has the lowest coefficient at ambient temperature and the highest at high temperature, PTFE composites filled with carbon fiber have the lowest wear rate at all temperatures.