WEAR RESISTANT AL ALLOY MEMBER AND ITS PRODUCTION

摘要

PURPOSE:To improve the wear resistance under high-temp. and high surface-pressure conditions by forming a surface coating layer dispersed therein with hard ceramic particles having prescribed hardness into nickel aluminide matrix structure having specific hardness. CONSTITUTION:A powder mixture composed of Ni and hard ceramic particles is coated on the surface of an Al alloy-base material and high-energy density such as TIG arc, laser beam or the like is irradiated to the surface of such composite layer to heat the surface. The nickel aluminide matrix structure 3 alloyed with Ni and the Al alloy which is the base metal is formed on the surface of the Al alloy-base material. The hard ceramic particles 3 are further dispersed in the Ni aluminide structure in the nondissolved state. The surface coating layer dispersed with the hard ceramic particles having >=1,000 hardness Hv in the Ni aluminide matrix structure 2 having >=400 hardness Hv is formed by the above-mentioned method. The wear resistance at and under high temp. and high surface-pressure is thus improved.