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通过冷压烧结法制备了聚四氟乙烯(PTFE)与钛酸酯和硅烷偶联剂修饰的纳米碳化硅(nano-SiC)复合材料,采用45#钢为摩擦对偶件的MM-200型摩擦磨损试验机,在室温干摩擦条件下测试了复合材料的摩擦学性能,用扫描电子显微镜(SEM)对磨损表面进行了观察并分析了磨损机理。结果表明:纳米SiC的加入能提高PTFE复合材料的硬度和耐磨性;偶联修饰改善了复合材料的摩擦学性能;与硅烷相比,钛酸酯偶联修饰nano-SiC/PTFE复合材料的硬度和摩擦学性能更好。两种偶联修饰复合材料的表面磨损情况相似,主要表现为粘着磨损,而未经偶联处理nano-SiC的复合材料在粘着磨损的同时出现了疲劳磨损。
The nano-silicon carbide (nano-SiC) composite modified by polytetrafluoroethylene (PTFE), titanate and silane coupling agent was prepared by cold-press sintering. MM-200 type friction The wear tester was used to test the tribological properties of the composites under room temperature and dry conditions. The wear surface was observed by scanning electron microscopy (SEM) and the wear mechanism was analyzed. The results show that the addition of nano-SiC can improve the hardness and wear resistance of the PTFE composites. Coupling modification can improve the tribological properties of the composites. Compared with silane, titanate coupling modified nano-SiC / PTFE composites Hardness and tribological properties better. The surface wear of the two kinds of coupling modified composites are similar, mainly showing adhesive wear, while the non-coupled nano-SiC composites show the same wear and tear as the adhesive wear.