HEAT SINK MATERIAL AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To improve the productivity of a high-quality heat sink by making easily manufacturable a heat sink material having such a characteristic that is adaptable to the balance between the coefficients of thermal expansion and thermal conductivity required for actual electronic parts (including semiconductor devices). SOLUTION: Graphite is put in a case and the case is housed in a furnace (step S301). A porous sintered compact of graphite is manufactured by baking the graphite in the furnace (step D302). Then the sintered compact is taken out of the furnace together with the case and housed in the recessed section of a press while the compact is put in the case (step S303). After pouring a molten metal into the case (step S304), the molten metal is press-injected into the porous sintered compact by pressing down the metal in the case by inserting a punch into the recessed section of the press (step S305). Consequently, the molten metal is impregnated into the open pores of the sintered compact.