Patent ID: 6110577
Filing Date: 2000-08-29
Classification: C04B,C22C,H01L,Y10T

Abstract:
A composite material for heat sinks for semiconductor devices, comprising:a porous sintered ceramic compact having an average open pore diameter of not greater than 50 .mu.m, said porous sintered ceramic compact being impregnated with a metal composed of copper or a copper alloy, said porous sintered ceramic compact being obtained by pre-calcinating a porous body having a coefficient of thermal expansion which is lower than a coefficient of thermal expansion of copper so that a network structure is formed;wherein a ratio of said copper or said copper alloy to said porous sintered ceramic compact is 20% by volume to 70% by volume, andsaid composite material has a coefficient of thermal expansion at 200.degree. C. that is lower than a theoretical coefficient of thermal expansion which is stoichiometrically obtained on the basis of a ratio between said copper or said copper alloy and said porous sintered ceramic compact.