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通过粉末冶金方法制备了硅灰石纤维(WF)与二硫化钼(Mo S2)填充改性聚四氟乙烯(PTFE)复合材料,研究了WF含量对WF-Mo S2/PTFE复合材料的拉伸、硬度与摩擦磨损性能的影响,并用扫描电镜对复合材料的摩擦面进行了分析。结果表明:添加WF和Mo S2后,复合材料的硬度提高;断裂伸长率相比于纯PTFE平均降低70%;WF质量分数超过7%后,复合材料的抗拉强度逐渐降低。加入WF后,复合材料的摩擦因数迅速提高,同时磨损进一步降低。通过扫描电镜分析发现,WF在摩擦面上优先承受载荷,减少基体PTFE与对偶面的摩擦,进而降低磨损量;Mo S2颗粒在摩擦过程中容易磨损,其碎屑在摩擦面起到润滑作用。Mo S2的质量分数为18%,WF质量分数为7%时,WF-Mo S2/PTFE复合材料的磨损量较低,同时摩擦因数也较小。
WF and Mo S2 were filled with modified polytetrafluoroethylene (PTFE) composites by powder metallurgy method. The effects of WF content on the tensile properties of WF-Mo S2 / PTFE composites , Hardness and friction and wear properties were investigated. The friction surfaces of the composites were analyzed by scanning electron microscopy. The results show that the hardness of the composites increases with the addition of WF and Mo S2, the elongation at break decreases by 70% compared with that of the pure PTFE, and the tensile strength of the composites decreases gradually when the WF content exceeds 7%. After adding WF, the friction coefficient of the composite rapidly increases, while further reducing wear. Scanning electron microscopy analysis showed that WF preferentially bears the load on the friction surface to reduce the friction between the substrate PTFE and the counterface and thus reduce the wear amount. The Mo S2 particles wear easily during the friction process, and the debris lubricates the friction surface. MoS2 mass fraction of 18%, WF mass fraction of 7%, WF-Mo S2 / PTFE composite wear lower, while the friction coefficient is also small.