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采用模压成型法制备了纳米Si3N4及其与石墨(Gr)混合填充的聚四氟乙烯(PTFE)复合材料,研究了不同质量分数的纳米Si3N4及其与石墨混合对PTFE复合材料力学与摩擦磨损性能的影响,利用扫描电子显微镜(SEM)观察了复合材料拉伸断口的微观结构,探讨了其增强机理。结果表明,纳米Si3N4/石墨混杂填料使PTFE复合材料的硬度、拉伸性能、冲击强度和耐磨性能均比单纯Si3N4填充的有所提高,其中7%Si3N4与5%石墨混杂填充的PTFE复合材料有较好的综合性能。微观分析表明,纳米Si3N4与石墨在PTFE基体中分散性较好,Si3N4与石墨具有较好的协同作用。
Nanosized Si3N4 and polytetrafluoroethylene (PTFE) composite filled with graphite (Gr) were prepared by compression molding method. The mechanical properties and friction and wear properties of nano-Si3N4 with different mass fractions of graphite and PTFE mixed with graphite The microstructure of tensile fracture of composites was observed by scanning electron microscopy (SEM), and the enhancement mechanism was discussed. The results show that the hardness, tensile properties, impact strength and abrasion resistance of PTFE composites are all improved compared with those of Si3N4 alone. Among them, 7% Si3N4 and 5% graphite mixed PTFE composites Have better overall performance. Microanalyses show that nano-Si3N4 and graphite disperse better in PTFE matrix, and Si3N4 and graphite have better synergistic effect.