Preparation and Properties of (SiCp+Al_2O_(3f))/7075Al Composites by Pressure Infiltration

摘要

(SiC_p+Al_2O_(3f))/7075Al composites as potential friction materials were prepared in this paper by pressure infiltration and some related properties were compared with traditional friction materials. The addition of Al_2O_3 fiber to SiC preform could contribute to enhance compressive strength of the preform as well as tensile strength of the composites. The tensile strength of as-fabricated composites with 35vol%SiC_p + 15vol% Al_2O_(3f) could reach 402MPa and the friction coefficient is about 0.4 and the thermal conductivity is higher than 120W/mK. Compared with traditional materials such as nodular cast iron, the composites exhibit better comprehensive properties and are suitable as brake materials for automobile.