用共混冷压成型法制备了SiC短纤维(未处理和偶联剂表面处理)增强聚四氟乙烯(PTFE)复合材料,测试了复合材料的力学和摩擦磨损性能,研究了表面处理对PTFE复合材料性能的影响,用扫描电子显微镜(SEM)对拉伸断面形貌进行观察,探讨了纤维增强复合材料的机理.研究结果表明:偶联剂处理SiC纤维表面后,复合材料的拉伸强度、冲击强度、减摩耐磨性能均比未处理的有所提高.拉伸断面的SEM分析表明,未处理SiC纤维与PTFE的界面黏结较差,界面出现了许多空隙,偶联剂处理后,SiC纤维与PTFE界面黏结较好,在拉伸过程中多数SiC纤维被基体牢固黏附而难以拔出.
SiC short fiber (as-received and treated with couple agent) strengthened polytetrafluoroethylene(PTFE)composites were prepared through mixing and cold pressing.The mechanical,friction and wear properties of the composites were tested.The effects of the surface treatment on the performance of the composites were investigated.The fracture surfaces by tensile stress were observed by using a scanning electron microscope(SEM).The strengthen mechanism for the composites was proposed.The results indicated that the tensile strength,impact strength,and friction and wear properties of the composites with surface treated SiC fiber are higher than those with as-received SiC fiber.SEM observation of fracture surfaces showed that poor bonding interface with gaps between untreated SiC fiber and the PTFE matrix is responsible for the lower performances of the corresponding composites.The couple agent surface treated SiC fiber has a strong adhesion with PTFE so that less SiC fiber were pull out during tensile process.
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