Effect of SiO_2 Particle Concentration on the Triboiogical Properties of PTFE Sealing Material

摘要

Oil suspension was made with different concentrations of SiO_2 particles.The effects of SiO_2 with different concentrations on frictional pairs 45# -PTFE under different velocities is investigated on MRH-3 abrasion tester. The worn of PTFE surfaces was investigated by scanning electron microscopy(SEM).The results show that the friction coefficient increases with increasing SiO_2 concentrations. The wear rate increases with the increasing particle concentration and then decreases a bit. Meanwhile the degree of wear increases with increasing particle concentrations. Furthermore, as shown in SEM micrographs, the main machenism of PTFE is furrowing wear.