PEEK与纳米SiO2填充PTFE复合材料的摩擦磨损性能研究∗

摘要

通过机械共混、冷压成型、烧结的方法制备聚醚醚酮(PEEK)与纳米 SiO2颗粒共同填充改性聚四氟乙烯(PTFE)复合材料试样。利用 MRH-3型环-块摩擦磨损实验机对不同配方比例的复合材料在不同实验条件下进行摩擦学性能实验。利用扫描电镜对试样磨损后的摩擦表面形貌和钢环表面的转移膜进行观察和分析。结果表明，填充5％PEEK 的 PTFE 复合材料的摩擦系数达到最低值；10％PEEK/PTFE 复合材料中添加不同体积比的纳米 Si O 2填料可以显著地降低材料的体积磨损率，其中5％Nano-SiO2/10％PEEK/PTFE复合材料的体积磨损率最小；载荷和速度的变化对 Nano-SiO2/PEEK/PTFE 复合材料的摩擦磨损性能的影响显著，而环境温度的变化对该复合材料的摩擦系数与磨损率的影响不明显。%PEEK and nano-SiO2 particles synergetic filled PTFE composites were prepared by mechanical blend-ing-molding-sintering method.The tribological behavior of composites with different volume fraction of fillers was tested on different test conditions by a MRH-3 block-on-ring friction and wear tester.The transfer film on counterpart GCr1 5 ring was inspected and anslyzed with scanning electronic microscopy (SEM).The results demonstrated that the lowest friction coefficient was gained when the PTFE composite was filled with only 5%PEEK.The special wear rate of 10%PEEK/PTFE were decreased clearly with filled different contents of nano-SiO2 particles.The special wear rate of the sample with 5% nano-SiO2 and 10%PEEK had the lowest volume wear rete.The load and sliding speed effect significantly on the tribological behavior of nano-SiO2/PEEK/PTFE composites,but the effect of environmental temperature on the friction coefficient and wear rate of the compos-ite is not obvious.