纤维增强聚酰亚胺复合材料的摩擦学行为

Tribological Behaviors of Fibers Reinforced Polyimide Composites

本文研究了碳纤维、玻璃纤维及石英纤维增强的PI复合材料在干摩擦和水环境下的摩擦磨损行为。研究表明,碳纤维增强PI复合材料在两种摩擦条件下的摩擦系数和磨损率都随碳纤维含量的增加而不断降低。而玻璃纤维和石英纤维增强PI复合材料的摩擦系数和磨损率则随纤维含量的增加而增大。材料的磨损均以塑性变形、微观破裂及破碎为主导,相同纤维种类和含量增强PI复合材料在水环境下的磨损率均较干摩擦下的低,这主要归因于摩擦副表面吸附或存留的水分的边界润滑作用。

The friction and wear properties of PI composites reinforced with short cut fiber such as carbon fiber, glass fiber and quartz fiber were evaluated under dry and water-lubricated-condition. The results indicate that the friction coefficient and wear rate of the CF reinforced PI composites decrease gradually with increasing fiber content under both dry and waterlubricated condition, while its increase continuously with increasing contents of GF and QF. The polyamide composites were characterized by plastic deformation, microcracking and spalling under both sliding condition. The wear rates of PI composites under water-lubricated-condition was considerably lower than that under dry sliding, which was proposed to be contributed to the boundary lubrication effect of water adsorbed and reserved on the wear surface of composites.