碳纤维改性热塑性聚酰亚胺材料摩擦磨损性能

Tribological Performance of Carbon Fiber Reinforced Thermoplastic Polyimide

通过正交实验设计和方差分析,系统考察了工况(温度、速度及载荷)对碳纤维改性热塑性聚酰亚胺(TPI)摩擦磨损行为的影响。用电子显微镜(SEM)观察其磨损面形貌分析材料磨损机制。研究表明:随着温度升高,分子链相对滑移增强,体现出良好的自润滑特性,材料的摩擦因数和磨损率均有所下降;排除摩擦热的干扰,方差分析表明载荷、速度及其交互作用对材料摩擦磨损行为影响不显著。根据粘着摩擦理论,载荷的改变对材料抗剪切强度无明显作用,表现为材料摩擦磨损性能稳定。随速度的增加,材料抗剪切强度呈现下降趋势,同时考虑到受力中的塑形硬化现象,摩擦因数出现先增后减的变化。

The effects of work conditions on tribological performance of carbon fiber （CF） reinforced thermoplastic polyimide （TPI）, including temperature, load and velocity, were analyzed through orthotropic and variance methods. The worn surface was observed by SEM, and wear mechanism was determined. Results indicate that molecular chain can slide relatively and provide self-lubricating by increasing temperature. Accordingly, the friction coefficient and wear rate is decreased by a order. Excluding the interruption of friction heat, the effects of loadings, velocity and its interactive on material tribological performance are not remarkable by variance analysis. According rare effect on material shear strength, and hence material tribological to theory behaviors strength of resistance shows a downward trend,with considering the transform of trends to ascend fistly and then descend with velocity increasing. of adhesive wear, the changing of load has are stable. As speeds increase, the shear materials hardness, the friction coefficient trends to ascend fistly and then descend with velocity increasing.