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

Abstract: 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 hk550 could 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.