炭素繊維強化アルミニウム合金複合材料の組織と諸特性に及ぼすバインダの影響

抄録

Carbon fiber, which has high strength, high rigidity and low thermal expansion, would be a candidate for improving the high temperature properties of aluminum. In this study, carbon fiber preforms were formed using a water glass binder for reducing the cost of the forming. Cast aluminum alloy was used for the matrix, and the fiber-reinforced composites were fabricated by the squeeze casting. Microstructure and properties of the composites were compared with the composites using the conventional silica binder. The carbon fibers were planar-dimensionally random arrangement in the composites, and the reaction at the carbon fiber-aluminum interface was not recognized. The thermal expansion coefficient of the composite was decreased only in the direction horizontal to the pressed surface in the squeeze casting, and the value was similar to that of the composite using the silica binder. The compressive strength was equivalent to that of the composite using the silica binder. Based on these results, the water glass can be used as a substitute binder for the silica sol.