Radiator plate and process for manufacturing the same

Abstract

A radiator plate includes a metallic matrix and a dispersant. The metallic matrix exhibits a predetermined coefficient of thermal expansion. The dispersant is dispersed in the metallic matrix, and exhibits a coefficient of thermal expansion being smaller than that of the metallic matrix. The radiator plate has a heat-receiving surface, on which an electric device serving as a heat generator is disposed, and a heat-radiating surface for radiating heat received from the heat-receiving surface. The dispersant is dispersed more on the heat-receiving-surface side than on the heat-radiating-surface side. Thus, the radiator plate is inhibited from warping, and is good in terms of the dimensional stability as a final product. Moreover, the thermal resistance is diminished between the heat-receiving surface and the heat-radiating surface. Accordingly, the heat-radiating ability of the radiator plate is secured. Also disclosed is a process for manufacturing the radiator plate.

What is claimed is:  
     
         1 . A radiator plate, comprising: 
 a metallic matrix exhibiting a predetermined coefficient of thermal expansion; and    a dispersant being dispersed in said metallic matrix and exhibiting a coefficient of thermal expansion being smaller than that of said metallic matrix;    said radiator plate having a heat-receiving surface, on which an electric device serving as a heat generator is disposed, and a heat-radiating surface for radiating heat received from the heat-receiving surface;    said dispersant being dispersed more on a side of said heat-receiving surface than on a side of said heat-radiating surface.    
     
     
         2 . The radiator plate according to  claim 1 , wherein: 
 said metallic matrix comprises aluminum as a major component; and    said dispersant comprises a primary crystal including silicon as a major component.    
     
     
         3 . The radiator plate according to  claim 1 , wherein said metallic matrix is at least one member selected from the group consisting of pure metals and alloys thereof.  
     
     
         4 . The radiator plate according to  claim 3 , wherein the pure metal is at least one member selected from the group consisting of aluminum, magnesium, copper and zinc.  
     
     
         5 . The radiator plate according to  claim 1 , wherein said dispersant is composed of primary crystal silicon particles.  
     
     
         6 . The radiator plate according to  claim 5 , wherein said primary crystal silicon particles comprise at least one member selected from the group consisting of a silicon simple substance and compounds being composed of said metallic matrix and silicon.  
     
     
         7 . A process for manufacturing a radiator plate, comprising the steps of: 
 pressurizing and charging a hypereutectic molten alloy into a cavity of a mold with a filtering member disposed therein, the filtering member having opposite sides, from one of the opposite sides of the filtering member at a temperature of generating a primary crystal or less; and    solidifying the resulting molten alloy after accumulating the primary crystal, being generated in said pressurizing-and-charging step, on said one of the opposite sides of the filtering member.    
     
     
         8 . The process for manufacturing a radiator plate according to  claim 7 , wherein said hypereutectic molten alloy is a molten aluminum-silicon alloy whose hypereutectic component is silicon.  
     
     
         9 . The process for manufacturing a radiator plate according to  claim 7 , after said solidifying step, further comprising the step of removing said filtering member.  
     
     
         10 . The process for manufacturing a radiator plate according to  claim 7 , wherein the filtering member is made from at least one member selected from the group consisting of fibers and whiskers.  
     
     
         11 . The process for manufacturing a radiator plate according to  claim 10 , wherein the fibers and whiskers are composed of at least one member selected from the group consisting of silicon carbide, carbon alumina, alumina-silica and glass.  
     
     
         12 . The process for manufacturing a radiator plate according to  claim 7 , wherein the filtering member hardly reacts with said hypereutectic molten alloy or hardly forms new compounds with said hypereutectic molten alloy.