Aluminum-copper clad member, method of manufacturing the same, and heat sink

Abstract

An aluminum-copper clad member includes an aluminum-base member, a copper-base member and an insertion member made of pure aluminum or JIS A1xxx series aluminum alloy. The aluminum-base member and the copper-base member are clad via the insertion member. A heat sink includes a heat radiation portion made of aluminum-base material and provided with a plurality of tongue-like fins formed by skiving a surface layer of one side of the heat radiation portion and a thermal diffusion portion made of copper-base material and joined to the other side of the heat radiation portion via an insertion member made of pure aluminum or JIS A1xxx series aluminum alloy.

What is claimed is:  
     
         1 . An aluminum—copper clad member, comprising: 
 an aluminum-base member;  
 a copper-base member; and  
 an insertion member made of pure aluminum or JIS A1xxx series aluminum alloy,  
 wherein said aluminum-base member and said copper-base member are clad via said insertion member.  
 
     
     
         2 . The aluminum—copper clad member as recited in the    claim 1   , wherein said copper-base member is made of oxygen free copper or phosphorus processed deoxidized copper.  
     
     
         3 . A method of manufacturing an aluminum—copper clad member, said method comprising the steps of: 
 joining an insertion member made of pure aluminum or JIS A1xxx series aluminum alloy to a copper-base member by a cold rolling to obtain a joined two members;  
 joining an aluminum-base member to said insertion member by a cold rolling or a hot rolling to obtain a joined three members; and  
 heat treating said joined two members before joining said aluminum-base member to said insertion member by a cold rolling or a hot rolling, or heat treating said joined three members after joining said aluminum-base member to said insertion member by a cold rolling or a hot rolling.  
 
     
     
         4 . The method of manufacturing an aluminum—copper clad member as recited in    claim 3   , wherein a roll-working rate of said insertion member is set to 30% or more.  
     
     
         5 . The method of manufacturing an aluminum—copper clad member as recited in    claim 3   , wherein a roll-working rate of said aluminum-base member is set to 40% or more.  
     
     
         6 . The method of manufacturing an aluminum—copper clad member as recited in    claim 4   , wherein a roll-working rate of said aluminum-base member is set to 40% or more.  
     
     
         7 . The method of manufacturing an aluminum—copper clad member as recited in    claim 3   , wherein said step of heat treating is performed at from 200 to 400° C.  
     
     
         8 . The method of manufacturing an aluminum—copper clad member as recited in    claim 4   , wherein said step of heat treating is performed at from 200 to 400° C.  
     
     
         9 . The method of manufacturing an aluminum—copper clad member as recited in    claim 5   , wherein said step of heat treating is performed at from 200 to 400° C.  
     
     
         10 . A heat sink, comprising: 
 a heat radiation portion made of aluminum-base material and provided with a plurality of tongue-like fins formed by skiving a surface layer of one side of said heat radiation portion; and    a thermal diffusion portion made of copper-base material and joined to the other side of said heat radiation portion in a closely fitted manner.    
     
     
         11 . The heat sink as recited in the    claim 10   , wherein said thermal diffusion portion is a flat plate.  
     
     
         12 . The heat sink as recited in the    claim 10   , wherein said thermal diffusion portion includes a heat exchanging medium chamber inside thereof.  
     
     
         13 . The heat sink as recited in the    claim 12   , wherein said heat exchanging medium chamber is provided with wicks formed on an inner wall thereof.  
     
     
         14 . A heat sink, comprising: 
 a heat radiation portion made of aluminum-base material and provided with a plurality of tongue-like fins formed by skiving a surface layer of one side of said heat radiation portion; and    a thermal diffusion portion made of copper-base material and joined to the other side of said heat radiation portion via an insertion member made of pure aluminum or JIS A1xxx series aluminum alloy.    
     
     
         15 . The heat sink as recited in the    claim 14   , wherein said thermal diffusion portion is a flat plate.  
     
     
         16 . The heat sink as recited in the    claim 14   , wherein said thermal diffusion portion includes a heat exchanging medium chamber inside thereof.  
     
     
         17 . The heat sink as recited in the    claim 16   , wherein said heat exchanging medium chamber is provided with wicks formed on an inner wall thereof.