Friction and Wear as well as Second Tribological Transfer Behavior of Two Types of Modified Polytetrafluoroethylene Solid Lubricating Composites

Polytetrafluoroethyl-ene (PTFE) composites filled with polyimide (PI) and bronze were prepared by compression molding and sintering.The friction and wear behavior as well as second tribological transfer of the filled PTFE composites under dry sliding conditions was evaluated using a reequipped M-2000 tribometer.The worn surfaces of the composites were examined by means of scanning electron micros-copy.Results show that under the given conditions,the filled PT-FE composites are able to form transfer film on the sliding surface of the counterpart and hence decrease the friction and wear of the frictional pair.At the same time,the two kinds of fillers were able to increase the adhesion of the transfer film to substrate and hence effectively protected the sliding metallic surfaces.And the PTFE/bronze composites were superior to PTFE/PI composites in terms of the friction and wear behavior.