二硫化钼改性PTFE摩擦磨损性能

Friction and Wear Properties of PTFE Composites Filled with MoS_2

干燥过筛聚四氟乙烯(PTFE)、二硫化钼(MoS_2),模压烧结制备MoS_2/PTFE复合材料,研究其摩擦磨损情况。结果表明,MoS_2填充质量分数为0、5%、10%、15%、20%时,复合材料的摩擦因数随转速的增大而增大;在20、40、60、80 r/min转速下,复合材料摩擦因数随MoS_2填充质量分数的增加而增大,当填充量为20%时,各转速下的摩擦因数均达到最大值。填充MoS_2显著降低复合材料体积磨损率,体积磨损率随MoS_2填充质量分数的增加而减小。摩擦过程中,铝合金摩擦面并没有发生擦伤,试样被铝合金硬质微凸体挤压、犁削,MoS_2/PTFE复合材料的磨损机理为磨粒磨损。

The friction and wear properties of polytetrafluoroethylene( PTFE) composites filled with molybdenum disulfide( MoS2) which had been dried and screened before preparation were investigated. The results show that the friction coefficient of the PTFE composites is increasing with the increase of speed at the0、5%、10%、15%and 20%mass fraction of MoS2. The friction coefficient is increasing with the increase of MoS2 content at the speed of 20、40、60 and 80 r/min. When the mass fraction of MoS2 was 20%,the friction coefficient of the PTFE composites could achieve maximum. Apparently, the volume wear rate significantly reduces after MoS2 filled,and the volume wear rate is decreasing with the increase of MoS2.During the process of friction,the friction surface of aluminum alloy has not been scratched. Samples are extruded and ploughed by hard micro convex body of Aluminum alloy,the mechanism of wear is abrasive wear.