表面改性碳纤维对聚酰亚胺复合材料摩擦学行为的影响

Effect of on Surface Modifided Carbon Fiber on Tribological Performance of Polyimide Composites

采用硝酸氧化法和涂层复合改性法分别对碳纤维(CF)进行表面改性,并制备CF改性聚酰亚胺(PI)复合材料。考察材料在不同滑动速度和载荷下的摩擦磨损行为,利用扫描电子显微镜观察磨损表面形貌。结果表明:CF与PI基体的界面结合强度对PI复合材料在不同滑动速度下的摩擦磨损性能影响较大,涂层复合处理法比硝酸处理法能更有效提高CF与基体的界面结合强度,提高复合材料在高滑动速度下的摩擦磨损性能。CF的强度是影响复合材料在不同载荷下摩擦磨损性能的主要因素,CF经过表面处理后强度出现不同程度的下降,导致在高载荷条件下复合材料的摩擦磨损性能下较未处理的CF/PI复合材料相比有所下降。

The short cut carbon fibers（CF） were treated by nitric acid oxidation and compound coating modification, and the po｜yimide（PI） composites with CF were prepared by hot moulding process. The tribologieal performances of CF/PI composites under different sliding speed and normal load were studied ,the worn surfaces of CF/PI composites were investigated by SEM. Results indicate that the interracial bonding strength of CF and PI is the most important factor to influence the tribological performance of PI composites under different sliding speed. The compound coating treatment improves the tribological performance of CF/PI composites under high sliding speed. The strength of CF is the most important factor to influence the tribological performance of CF/PI composites under different normal load. The strength of CF is reduced by both two surface treatments. So the tribological performances of CF/PI filled with untreated CF are better than those with treated CF under high normal load.