聚四氟乙烯/碳纤维增强聚酰亚胺复合体系的摩擦学性能

研究评价了不同PTFE含量的碳纤维增强P1复合材料的力学和摩擦学性能，并分析了在干摩擦和水润滑2种不同条件下的磨损表面形貌和磨损机理。研究表明：PTFE以10%添加时PI/CF/PTFE体系的机械性能最佳，而摩擦学性能以5%添加为佳；随PTFE含量的增加，复合材料的摩擦系数降低，磨损率增加。水润滑下，摩擦系数和磨损率比干摩擦下的都有相应的降低。干摩擦下，材料的磨损均以塑性变形、微观破裂及破碎为主导；水润滑下，这一机制显著减弱，归因于水的润滑和冷却作用。

Tribological Properties and Wear Mechanism of PTFE and Carbon Fiber Reinforced PI Composites

The mechanical properties and fricition and wear behavior of carbon firber reinforced PI composites with different PTFE containing was comparatively evaluated under dry sliding and water-lubricated condition. The wear mechanisms of the composites under the two different sliding conditions were also comparatively discussed, based on scanning electron microscopic examination of the worn composite. As the results, the inclusion of PTFE in PI contributed to decrease the friction coefficients considerably. However, the wear rate of the composites increases gradually with increasing PTFE content under both dry-and water-lubricated sliding. PI composite with 10% PTFE content has the best mechanical properties. All the composites are characterized by plastic deformation, micro cracking, and spalling under both dry-and water-lubricated conditions. Such plastic deformation, micro cracking, and spalling, however, is significamtly abated under water-lubricated condition. There attributed to the lubricity and cooling effect of water.