Patent ID: 7364632

Claim:
A radiator member for dissipating heat in electronic appliances in which a molten matrix metal is impregnated into an SiC powder which is not sintered and in which SiC coarse particles and SiC fine particles are mixed, the radiator member comprising: SiC coarse particles having a larger average particle diameter, said average particle diameter being from 75 to 125 μm; SiC fine particles having a smaller average particle diameter, said average particle diameter being from 7 to 15 μm; and a matrix metal in which the SiC coarse particles and the SiC fine particles are dispersed and whose major component is Al and being characterized in that it is composed of a composite material, wherein said SiC coarse particles and said SiC fine particles are present in said matrix metal in a filling factor of from 65 to 75% by volume when the entirety is taken as 100% by volume; a volumetric ratio of the SiC coarse particles with respect to the SiC fine particles is from 1.5 to 4; and an average particle diameter ratio of the SiC coarse particles with respect to the SiC fine particles is from 11 to 14.