表面改性对碳纤维/酚醛树脂基复合材料摩擦性能的影响

Effect of Surface Modification of Carbon Fiber on Friction Properties of Carbon Fiber/Phenolic Resin Matrix Composite

使用浓硝酸和硅烷偶联剂(hk550)对PAN基碳纤维(3K)进行表面改性,以酚醛树脂为基体制备复合材料,使用扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR),和X射线光电子能谱(XPS)等手段研究了碳纤维的结构和表面特性。用拉伸试验机测量了复合材料的拉伸强度,用微纳米力学综合测试系统(UNMT-1)测量了复合材料的摩擦性能。结果表明,用浓硝酸和偶联剂处理可提高碳纤维表面的粗糙度和化学活性,可改善碳纤维与酚醛树脂基体之间的界面结合,使复合材料的拉伸强度提高、磨损率降低。

Polyacrylonitrile(PAN)-based carbon fiber was surface modified with HNO3(65-68%) and silane coupling agent(hk550) and of which the structural and surface characteristics of were investigated by SEM, FT-IR, and X-ray photoelectron spectroscopy(XPS). Then the surface modified carbon fiber reinforced phenolic matrix composites were prepared. The tensile strength and the friction performance of the composites were examined by tensile testing machine and integrated micro- nano- mechanical test system(UNMT- 1) respectively. The results showed that the surface modification with HNO3 and hk550could enhance the surface chemical activity and roughness of the fibers, resulting in better interfacial adhesion between carbon fibers and phenolic resin matrix, therefore, improved the tensile strength and reduced the wear rate of the composites.