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为了探讨填料含量对Cu/聚四氟乙烯(PTFE)复合材料摩擦磨损的影响,运用二维颗粒流程序(PFC2D)对PTFE基复合材料在不同含量的Cu颗粒填充条件下与45#钢的摩擦磨损过程进行数值模拟分析,主要研究了Cu/PTFE复合材料的摩擦转移及磨损问题。模拟结果表明:Cu/PTFE复合材料与45#钢组成摩擦副时,会在45#钢表面形成一层转移颗粒层,转移颗粒层的形成能够有效地降低PTFE基复合材料的磨损。Cu颗粒的添加一方面可以通过自身转移的“钉扎”作用促进转移颗粒层的形成,另一方面由于提高了复合材料的整体强度,又对转移颗粒层的形成产生了一定的抑制作用。所以添加适量的Cu有利于转移颗粒层的形成,但Cu含量过高时其作用又会降低。Cu颗粒的加入降低了PTFE基复合材料的磨损量,且随着Cu含量的增加减磨效果增强。在Cu颗粒的质量分数为50%时,PTFE基复合材料的磨损颗粒数较纯PTFE的减少了近一半。
In order to investigate the effect of filler content on friction and wear of Cu / PTFE composites, two-dimensional particle flow program (PFC2D) was used to simulate the friction between PTFE composites and 45 # steel with different contents of Cu particles. Wear process of numerical simulation analysis of the Cu / PTFE composite friction transfer and wear problems. The simulation results show that when the Cu / PTFE composite material is composed of 45 # steel, a layer of transfer particles is formed on the surface of 45 # steel. The formation of transfer particle layer can effectively reduce the wear of PTFE matrix composites. On the one hand, the addition of Cu particles can promote the formation of transfer granular layer through the self-transferring “pinning ” effect, and on the other hand, the formation of transfer granular layer is restrained by increasing the overall strength of the composite material . Therefore, adding the appropriate amount of Cu is conducive to the formation of particles transfer layer, but the role of excessive Cu content will be reduced. The addition of Cu particles reduced the wear of PTFE-based composites, and the anti-wear effect increased with the increase of Cu content. When the mass fraction of Cu particles is 50%, the number of wear particles of PTFE-based composite material is reduced by nearly half compared with pure PTFE.