Patent ID: 6933531

Claim:
A heat sink material comprising carbon or graphite and metal which is at least one selected from Cu, Al, and Ag, said metal having one or more of Te, Bi, Pb, Sn, Se, Li, Sb, Tl, Ca and Cd added thereto for improving wettability at an interface between said carbon or graphite and said metal, wherein said heat sink material is constructed by infiltrating a porous sintered member with said metal, said porous sintered member being obtained by sintering said carbon or said graphite to form a network, wherein an average coefficient of thermal conductivity of those in directions of orthogonal three axes, or a coefficient of thermal conductivity in a direction of any axis is not less than 180 W/mK, and a ratio of coefficient of thermal conductivity is not more than 1:5 between a direction in which said coefficient of thermal conductivity is minimum and a direction in which said coefficient of thermal conductivity is maximum, and wherein a coefficient of thermal expansion is 1×10 −6 to 10×10 −6 /° C.