载荷对氧化锌晶须增强尼龙摩擦磨损的影响

Effect of Normal Load on Friction and Wear of Nylon Composites Reinforced with ZnOw

采用热压成型方法制备了不同质量分数氧化锌晶须(ZnOw)尼龙1010(PA1010)复合材料,对复合材料的力学性能和摩擦学性能进行了试验研究,分析了复合材料的磨损机理.结果表明,填充ZnOw可以增加尼龙的压缩强度和弹性模量;提高并稳定尼龙复合材料的摩擦系数,增强复合材料的抗磨损性能.纯尼龙随着载荷的增大摩擦系数急剧降低,磨损率上升,而复合材料的摩擦系数和磨损率受载荷的影响较小.当ZnOw质量分数达到15%时,复合材料的摩擦系数最高,磨损率最低.纯尼龙的磨损随着正压力的增加由磨粒磨损和轻微黏着磨损转变为热破坏.ZnOw/PA复合材料随着ZnOw质量分数的增加,磨损由黏着磨损,转变为犁沟、疲劳断裂和转移膜的反向转移.

PA1010 composites filled with ZnO whisken（ZnOw）were prepared by hot pressing. The mechanical properties and tribological behavior of composites were studied. The wear mechanism was analyzed using a scanning electron microscopy. The results show that filling ZnOw increased the compress strength, elastic modulus and coefficient of friction, improved the anti-wear ability of composites. For pure nylon, the coefficient of friction decreased with a large extent, wear rate increased with the increasing of normal load. Both coefficient of friction and wear rate of composites affected a little by normal load. Composites including ZnOw of 15% exhibited the largest coefficient and the lowest wear rate. The wear of pure nylon changed from abrasive wear and adhesion wear under the lower normal load to thermal damage under the higher normal load. The main wear of composites is adhesion when composites included lower content of ZnOw. With the increasing of ZnOw content, the main wear changed to ploughing and fatigue, even the transfer film on the surface of couple samples transferred to the surface of composites.