CLADDING MATERIAL AND ITS FABRICATION METHOD, METHOD FOR MOLDING CLADDING MATERIAL, AND HEAT SINK USING CLADDING MATERIAL

摘要

Recent semiconductor device becomes high powered, and on the material of heat sinks on which these devices are mounted, lower thermal expansion coefficient and higher thermal conductivity are needed. For this requirement, material with thermal conductivity as high as Cu alone and also with low thermal expansion coefficient, is needed. An aspect in accordance with the present invention provides, a cladding material in which 1st material layer and 2nd material layer are laminated alternately, wherein thermal expansion coefficient of said 2nd material is lower than the thermal expansion coefficient of said lst material, and thermal conductivity of said 2nd material is lower than the thermal conductivity of said lst material, and a total number of laminated layers composed of said lst material and said 2nd material is 5 or more.