Patent ID: 6479095
Filing Date: 2002-11-12
Classification: C04B,C22C,H01L,Y10T

Abstract:
A method for producing a composite material for heat sinks for semiconductor devices using a porous sintered compact and molten metal that react with one another, said method comprising:an impregnating step of heating said porous sintered compact to serve as a base material and a metal containing at least copper, said porous sintered compact and said metal initially being in separate chambers of the same vessel in a state of making no contact with each other in order to minimize decomposition of said porous sintered compact due to the reactivity of said metal upon heating, said impregnating step further comprising waiting until a predetermined temperature is reached before bringing said porous sintered compact and said metal into contact with each other thereby making contact between said porous sintered compact and said metal at a stage of arrival at said predetermined temperature, and immediately applying a predetermined pressure so that said porous sintered compact is impregnated with said metal; and a cooling step of cooling said porous sintered compact impregnated with at least said metal at a cooling rate of at least âˆ’480Â° C./min in order to minimize contact time between said impregnated porous sintered compact and said reactive molten metal.