Mechanical and Triboiogical Properties of Polytetrafluoroethylene filled Polyoxymethylene /Aluminum Foam Interpenetrating Phase Composites

摘要

A new type of interpenetrating phase composites (IPC) was prepared by impregnating open-cell aluminum foam (AF) with polyoxymethylene (POM) through an injection molding process, and their mechanical properties has been investigated. It shows relatively high bending strength and impact strength with compared to the pure AF and POM. With the addition of 10wt% polytetrafluoroethylene (PTFE) to POM, the mechanical properties of the IPC are further improved . On the other hand, Triboiogical tests of IPC were carried out with a pin-disk machine, and their worn surfaces were characterized by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) to explore the wear mechanism. Results show that the friction coefficient of AF/POM/PTFE IPC is about 12.7% lower than that of AF/POM IPC and the wear loss reduced by 33.3%. The reason of the increase in the wear resistance can be explained by the transfer film which delays the wear process.