SUBSTRATE FOR POWER MODULE AND ITS PRODUCING PROCESS, AND POWER MODULE

摘要

PROBLEM TO BE SOLVED: To reduce the weight while improving the machinability, and to attain a sufficient strength while preventing warp. SOLUTION: A radiator 16 has a metallic main component 17 provided with a filler 18 having a low thermal expansion coefficient. The main component 17 is formed of a so-called high heat conducting material having a high thermal conductivity, e.g. Cu or a Cu alloy. The filler 18 is a linear body having an appropriate size composed of a metal, e.g. Invar alloy, having a thermal expansion coefficient smaller than that of the main component 17. The filler 18 is formed integrally with the main component 17 and oriented to a specified direction on a plane when the radiator 16 is formed. COPYRIGHT: (C)2004,JPO&NCIPI