Friction and wear behavior of polytetrafluoroethene composites filled with Ti_3SiC_2

摘要

In this work, polytetrafluoroethylene (PTFE) composites filled with Ti_3SiC_2 or graphite were prepared through powder metallurgy. The effects of different filling components, loads and sliding velocities on the friction performance of Ti_3SiC_2/PTFE composites were studied. Ti_3SiC_2/PTFE composites exhibit better wear resistance than graphite/PTFE composites due to the better mechanical properties of Ti_3SiC_2. The wear resistance was found to improve around 100× over unfilled PTFE with the addition of 1 wt.% Ti_3SiC_2. In addition, the 10wt.% sample had the lowest wear rate of K =2.1 × 10~(-6) mm~3/Nm and the lowest steady friction coefficient with μ = 0.155 at the condition of 90 N-0.4 m/s. Ti_3SiC_2 was proved to promote the formation of a thin and uniform transfer film on counterpart surface and a protection oxide film on worn surface, which are the key roles for improving wear resistance.