纳米AlN填充PTFE复合材料的摩擦性能研究

Study on the Tribological Properties of Nano-AlN Filled PTFE Composite

以纳米氮化铝(AlN)为填料制备了聚四氟乙烯(PTFE)复合材料,研究了该复合材料在干摩擦条件下与不锈钢对摩时的摩擦磨损行为.结果表明:纳米AlN填充FTFE基复合材料的耐磨性能明显优于纯PTFE。不同用量纳米AlN填充PTFE复合材料的摩擦系数最多上升16.5%,而耐磨性最多却能提高150倍,当纳米AlN用量为5%,PTFE复合材料的耐磨性最好。SEM观察发现:纯PTFE的磨损表面上分布着大量的带状结构,有明显的犁削和粘着磨损的痕迹。当复合材料中纳米AlN用量较低时,复合材料的磨损机制主要表现为不同程度的黏着磨损,但当复合填料中纳米AlN用量较高时,复合材料的磨损机制主要表现不同程度的黏着磨损和磨粒磨损,同时其复合材料的摩擦磨损性能出现了恶化现象。

Composites of polytetrafluoroethylene（PTFE） filled with nano-AlN at various mass fraction were prepared and their friction and wear performance at dry sliding against stainless steel ring were studied. It showed that the wearresisting property of PTFE was significantly enhanced by filling nanoAlN. Although the friction coefficient of the composites was increased up to 16.5 % based on neat PTFE, the wear - resistance of the composite was increased by 150 times. The optimal mass fraction of nano- AlN was found to be 5 %. SEM found a large of fiber structures existed on the worn surfaces of neat PTFE with obvious ploughing and adhesion marks. When the mass fraction of nano- AlN was low, the main wear mechanism of the composites was adhesion wearing. However, when the mass fraction of nano- AlN was high, wear mechanisms was partially converted to abrasive wearing, thus the friction and wear properties were deteriorated.