MoS2和PTFE改性炭纤维织物复合材料的摩擦磨损性能研究

采用玄武三号栓-盘式摩擦磨损试验机研究了炭纤维织物及辐照PTFE粉和MoS2粉改性炭纤维织物复合材料的摩擦磨损性能,考察了MoS2的添加量及环境温度对改性炭纤维织物复合材料的摩擦磨损性能的影响,并用配备X射线能量色散谱的扫描电子显微镜对其磨损表面和偶件栓表面进行了观察和分析.结果表明:MoS2改性炭纤维织物可以明显改善炭纤维织物复合材料的摩擦磨损性能,而PTFE的加入则不利于其摩擦磨损性能的改善;当MoS2质量分数在5%～15%之间时,MoS2可以有效降低炭纤维织物复合材料的摩擦系数;当MoS2质量分数为10%时,MoS2改性炭纤维织物复合材料的综合摩擦磨损性能最佳;在不同温度条件下,MoS2改性炭纤维织物复合材料的摩擦系数和磨损率均低于炭纤维织物材料;当温度达到240 ℃时,炭纤维织物复合材料的磨损率急剧增大,但MoS2改性炭纤维织物复合材料的磨损率比炭纤维织物材料降低近35%.

Friction and Wear Properties of Carbon Fabric Composites Filled with PTFE and MoS2

Friction and wear behaviors of MoS_2 and PTFE-modified carbon fabric composites were studied by using an Xuanwu-III high temperature friction and wear tester. Effects of MoS_2 content and test temperature on the tribological properties of carbon fabric composites were studied also. Worn surfaces and counterpart worn surface were analyzed by using a JSM-5600LV scanning electron microscopy (SEM) equipped with an energy dispersive X-ray analyzer (EDXA). It is found that friction-reducing and anti-wear properties of carbon fabric composites can be greatly improved by filling MoS_2, but PTFE as filler reinforced carbon fabric composites is not beneficial for enhancing their anti-wear and reducing-friction ability. When content of MoS_2 is 5%~15%, MoS_2 as filler can obviously reduce friction coefficient of carbon fabric composites. When content of MoS_2 is 10%, carbon fabric composites exhibit best tribological properties. Friction coefficient and wear rate of MoS_2-modified carbon fabric composites is lower than unmodified carbon fabric composites at different test temperatures. When test temperature rises to 240 , wear rate of carbon fabric composites increases rapidly, but wear rate of MoS_2-modified carbon fabric composites can be reduced 35% compared to that of unmodified carbon fabric composite.