不同纳米材料与石墨混合填充PTFE复合材料摩擦磨损性能

FRICTION AND WEAR PROPERTIES OF PTFE COMPOSITES FILLED WITH DIFFERENT MIX MATERIALS MADE OF NANOCRYSTALLINE AND GRAPHITE

摘要: 利用MM-200型磨损试验机考察了载荷对纳米SiO₂、TiO₂、Al₂O₃与石墨混合填充PTFE复合材料摩擦磨损性能的影响,采用扫描电子显微镜观察分析磨损表面形貌及磨损机理。结果表明,纳米材料及其与石墨混合都可以不同程度地提高PTFE的耐磨性,而它们对PTFE耐磨性的提高程度各不相同,其中以纳米SiO₂-石墨填充PTFE复合材料的磨损质量损失最小,纳米Al₂O₃-石墨填充PTFE复合材料的磨损质量损失较大;填充PTFE复合材料同钢对磨时的摩擦系数表现出不同的性能,纳米SiO₂-石墨填充PTFE的摩擦系数与纯PTFE相差不大。

Abstract: It is discussed that the friction and wear properties of polytetrafluoroethylene (PTFE) composites filled with different mix materials made of nanocrystalline and graphite. The friction and wear tests were carried out using MM-200 wear tester. The worn surfaces of PTFE composites were examined by the scanning electric microscopy (SEM). It is found that the addition of nanocrystalline and graphite not only increases the wear resistance of PTFE, but also results in changing the friction coefficient of the material. The three materials have different properties of anti-wear.The SiO₂-graphite-PTFE has excellent tribology property. The raising of the wear load increases the wear mass loss of PTFE composites.