表面处理纳米Si3N4／PTFE复合材料的力学与摩擦学性能

聚四氟乙烯

表面处理纳米Si3N4／PTFE复合材料的力学与摩擦学性能
顾红艳 何春霞南京农业大学工学院,江苏南京210031

摘　要:用热压成型法制备了纳米Si3N4填充的聚四氟乙烯（PTFE）复合材料，研究了纳米Si3N4质量分数、表面处理对PTFE复合材料力学和摩擦磨损性能的影响，用扫描电子显微镜（SEM）对拉伸断口形貌进行观察，分析了复合材料增强机制。结果表明：未处理纳米Si3N4能提高复合材料的硬度和耐磨性，但拉伸强度和冲击强度有所降低；表面处理纳米Si3N4后，PTFE复合材料的拉伸强度、冲击强度、减摩性能有所提高。拉伸断口的微观分析表明，表面处理Si3N4在PTFE基体中有较好的分散性，与PTFE基体界面结合较好。[著者文摘]

关键词:纳米Si3N4 聚四氟乙烯 表面处理 力学性能 摩擦磨损性能
分类号:　TB332[著者标引]文献标识码：A文章编号：0254-0150（2009）11-040-4栏目信息：试验研究
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Mechanical and Tribological Properties of PTFE Composites Filled with Nano-SiaN4 by Surface TreatmentGu Hongyan He Chunxia Engineering College, Nanjing Agricultural University, Nanjing Jiangsu 210031, ChinaAbstract:The composites of polytetrafluoroethylene （PTFE） filled with nano-Si3N4 were prepared by heating compres- sion molding. The effects of content and surface treatment of nano-Si3N4 on the mechanical, friction and wear properties of PTFE composites were investigated. The tensile fractures were observed by a scanning electron microscope （SEM）. The strengthen mechanism for the composites was investigated. The results show that the untreated nano-Si3N4 can raise the hardness and wear resistance of composites, but it reduces tensile strength and impact strength of the composites. Nano- Si3N4 by surface treatment increases the tensile strength, impact strength and friction properties of composites. The micro- analysis of tensile fracture shows that nano-Si3N4 by surface treatment has a better dispersion in the PTFE matrix, and has a better combination with the PTFE matrix.[著者文摘]

Key words:nano-Si3N4 ; PTFE ; surface treatment ; mechanical property ; friction and wear property