聚苯硫醚与纳米 Al2O3填充聚四氟乙烯复合材料的摩擦磨损性能

摘要

PPS /PTFE and nano-Al2 O3 /PPS /PTFE composites were prepared by molding-sintering method.The tribolog-ical and wear behaviors of nano-Al2 O3 and PPS filled PTFE composites were studied with a MRH-3 block-on ring friction and wear tester.The worn surface and transfer film of the composites were inspected by scanning electronic microscopy (SEM),and the abrasion mechanism was discussed.The results show that the friction coefficient and volume wear rate of the PPS /PTFE composites reach the lowest level with 5% PPS.With the adding of nano-Al2 O3 ,the tribological behavior of PPS /PTFE blends is improved a lot,when nano-Al2 O3 mass fraction is 5%,compared with virgin PTFE,the wear resist-ance is improved more than 276 times.The Scanning Electron Microscope(SEM)result shows the wear mechanisms of vir-gin PTFE,PPS /PTFE composites and nano-Al2 O3 reinforced PPS /PTFE blends are adhesive wear at room temperature,at temperature of 150 ℃,abrasive wear also happens for nano-Al2 O3 reinforced PPS /PTFE.%用机械共混、冷压成型、烧结的方法制备聚苯硫醚（PPS）和纳米 Al2 O3填充聚四氟乙烯（PTFE）复合材料试样；用 MRH-3型环-块试验机测试在干摩擦条件下各试样的摩擦磨损性能；用 SEM对试样的磨损表面与转移膜表面的形貌进行观察和分析，并探讨磨损机制。结果表明：PPS 质量分数为5％时，PPS /PTFE 复合材料的摩擦因数和体积磨损率均达到最小值；纳米 Al2 O3的加入进一步改善了 PPS /PTFE 复合材料的摩擦学性能，当其质量分数为5％时，纳米 Al2 O3/PPS /PTFE 复合材料体积磨损率最小，耐磨性较纯 PTFE 提高了276倍。扫描电子显微镜显示，室温下 PT-FE、PPS /PTFE 和纳米 Al2 O3/PPS /PTFE 复合材料的磨损机制主要是黏着磨损，而150℃时纳米 Al2 O3/PPS /PTFE 复合材料伴有磨粒磨损。