Graphite heat sink and method of manufacturing the same

Abstract

A graphite heat sink with light weight and high mechanical strength includes graphite fins and a metal press-fitted and fixed to a part of a surface of the graphite fin.

What is claimed is: 
     
         1 . A graphite heat sink comprising:
 graphite fins; and   a metal press-fitted and fixed to parts of surfaces of the graphite fins.   
     
     
         2 . The graphite heat sink according to  claim 1 ,
 wherein an amount of the metal press-fitted is 15% or more to 35% or less of a thickness of the graphite fin extending along a press-fitting direction.   
     
     
         3 . The graphite heat sink according to  claim 1 , further comprising:
 a metal fin base continued from the metal.   
     
     
         4 . A method of manufacturing a graphite heat sink comprising:
 forming a graphite plate by applying pressure to a plurality of laminated polymer films and by heating the films to be graphitized to obtain a graphite fin; and   press-fitting and fixing a metal to a part of a surface of the obtained graphite fin.   
     
     
         5 . The method of manufacturing the graphite heat sink according to  claim 4 ,
 wherein the polymer film is at least one kind selected from a group including polyoxadiazole, polybenzothiazole, polybenzobisthiazole, polybenzoxazole, polybenzobisoxazole, polypyromellitimide, aromatic polyamide, polyphenylene benzimidazole, polyphenylene benzobisimidazole, polythiazole and polyparaphenylene vinylene.   
     
     
         6 . The method of manufacturing the graphite heat sink according to  claim 4 ,
 wherein a press-fitting amount of the metal is 15% or more to 35% or less of a thickness of the graphite fin extending along a press-fitting direction.   
     
     
         7 . The method of manufacturing the graphite heat sink according to  claim 4 , wherein the press-fitting and fixing the metal to a part of the surface of the graphite fin further includes:
 providing a groove for the fin in the fin base continued from the metal; and   setting up the graphite fin in the groove for the fin to press-fit the graphite fin to the fin base.   
     
     
         8 . The method of manufacturing the graphite heat sink according to  claim 7 ,
 wherein, the setting up the graphite fin in the groove for the fin to press-fit the graphite fin to the fin base, further includes setting a gap between the graphite fin and the groove for the fin to be within a range from 1% to 5% when a width of the groove for the fin is 100%.   
     
     
         9 . The method of manufacturing the graphite heat sink according to  claim 7 , wherein:
 the providing of the groove includes expanding a width of the groove by heating the metal in a high-temperature environment; and   the setting up the graphite fin in the groove further includes contracting the width of the groove by returning the metal to room temperature so that the graphite fin is fixed due to contraction of the metal at the time of returning to room temperature.