Heat radiator composed of a combination of a graphite-metal complex and an aluminum extruded material

Abstract

To provide a heat radiator that is useful for an LED package, high-load semiconductor, high-load capacitor or an integrated circuit board composed of a combination thereof that assumes a short lifetime and falls at high temperatures. To constitute a heat radiator that is low in cost, superior in mechanical strength, and, furthermore, superior in heat radiating effect, by combining a graphite-metal complex that is good in heat diffusivity and an aluminum heat sink that is large in heat radiating surface area.

1 . An article of manufacture comprising:
 a heat radiator wherein aluminum, copper or an alloy thereof has been pressure-impregnated by squeeze casting into a graphite molding that incorporates a 50-92 volume % graphite powder, and the obtained graphite-metal complex is cut into board shapes and brought into contact with the part of the flat or curved sections of a heat sink composed of an extruded material of aluminum or aluminum alloy.   
     
     
         2 . The article of manufacture as recited in  claim 1 , wherein the graphite used to produce the heat radiator is derived from a molding by unidirectional pressure, using an extruded molding, a cold isostatic pressure molding and a die. 
     
     
         3 . An article of manufacture comprising:
 a heat radiator wherein aluminum, copper or an alloy thereof has been pressure-impregnated by squeeze casting into a graphite molding that incorporates a 50-92 volume % of combined chopped fibers of graphite and man-made graphite, and the obtained graphite-metal complex is cut into board shapes and brought into contact with the part of the flat or curved sections of a heat sink composed of an extruded material of aluminum or aluminum alloy.   
     
     
         4 . The article of manufacture as recited in  claim 3 , wherein the graphite used to produce the heat radiator is derived from a molding by unidirectional pressure, using an extruded molding, a cold isostatic pressure molding and a die. 
     
     
         5 . An article of manufacture comprising:
 a heat radiator wherein aluminum, copper or an alloy thereof has been pressure-impregnated by squeeze casting into a graphite molding that incorporates a 50-92 volume % graphite powder, and the obtained graphite-metal complex is cut into column shapes or prism shapes, which are disposed in the middle of a heat sink composed of an extruded material of aluminum or aluminum alloy, wherein fins of the heat sink have been radially arrayed, and the column or prism sides touch the heat sink   
     
     
         6 . The article of manufacture as recited in  claim 5 , wherein the graphite used to produce the heat radiator is derived from a molding by unidirectional pressure, using an extruded molding, a cold isostatic pressure molding and a die.