纳米碳化硅改性聚四氟乙烯复合材料的摩擦磨损性能

采用不同偶联剂对纳米碳化硅进行表面处理后，制备了聚四氟乙烯/纳米碳化硅复合材料，考察了偶联剂种类和含量随载荷变化对复合材料摩擦磨损性能的影响，并利用扫描电子显微镜观察和分析了复合材料磨损表面形貌及其磨损机理。结果表明，经表面处理的纳米碳化硅填充后的复合材料硬度和摩擦磨损性能均有提高，以钛酸酯偶联剂（NDZ101）处理效果最好；随着偶联剂含量的增大，钛酸酯偶联剂（NDZ101）处理的复合材料的磨损量和摩擦因数均增大，偶联剂最佳含量为填料质量的1 %；偶联剂处理后的纳米碳化硅与基体之间形成了良好的界面，复合材料的磨损以黏着磨损和磨粒磨损为主。

Friction and Wear Properties of Nano SiC Modified PTFE Composites

Nano SiC was treated with different coupling agents, the effect of coupling agent content on tribology properties of PTFE composites was investigated. The worn surface of PTFE composites was examined with a scanning electron microscope (SEM). It showed that hardness and tribology properties of PTFE composites filled with treated nano SiC were higher than those with untreated nano SiC, and the titanate (NDZ101）was the most effective among various coupling agents. The wear mass loss and friction coefficient of PTFE composites decreased with increasing coupling agent, however, the effect was inversed when the loading of coupling agent was larger than 1 %. SEM micrograph of fracture surface revealed that there was favorable interface bonding between NDZ101 treated nano SiC and PTFE matrix. The wear mechanism of PTFE composites was also discussed.