Metal Foil and Composite Heat Dissipating Plate Thereof

Abstract

The present invention provides a highly thermal conductive and heat radiation absorptive metal foil with a basis weight of at least 220g/m 2 and a metal content of at least 90%. The present invention further provides a composite heat dissipating plate comprising a metal foil having a first surface and an opposite second surface, a basis weight of at least 220g/m 2 , a metal content of at least 90%, and at least a layer of nitrogen-doped graphene coated on at least one of the first surface and the second surface. At least one of the above-mentioned surfaces has a roughness of 0.19≦Ra≦0.23 μm, 1.3≦Rt≦1.84 μm and/or 1.02≦Rz≦1.07 μm. The metal foil has crystal size between 308 and 434 Å, and a lightness of surface colors of 25<L*<40.

What is claimed is: 
     
         1 . A metal foil having a basis weight of at least 220 g/m 2  and a metal content of at least 90%. 
     
     
         2 . The metal foil of  claim 1 , wherein said metal foil is a copper foil. 
     
     
         3 . The metal foil of  claim 1 , wherein said metal foil has a basis weight between 220 and 884 g/m 2 . 
     
     
         4 . The metal foil of  claim 1 , wherein said metal foil has a metal content of at least 98%. 
     
     
         5 . The metal foil of  claim 1 , wherein said metal foil has a first surface and an opposite second surface; and at least one of said first surface and said second surface has a roughness of 0.19≦Ra≦0.23 μm. 
     
     
         6 . The metal foil of  claim 1 , wherein said metal foil has a first surface and an opposite second surface; and at least one of said first surface and said second surface has a roughness of 1.3≦Rt≦1.84 μm. 
     
     
         7 . The metal foil of  claim 1 , wherein said metal foil has a first surface and an opposite second surface; and at least one of the said first surface and said second surface has a roughness of 1.02≦Rz≦1.07 μm. 
     
     
         8 . The metal foil of  claim 1 , wherein said metal foil has crystal size between 308 and 434 Å. 
     
     
         9 . The metal foil of  claim 1 , wherein said metal foil has a lightness of surface colors of 25<L*<40. 
     
     
         10 . A composite heat dissipating plate including:
 a metal foil having a first surface and an opposite second surface, wherein said metal foil has a basis weight of at least 220 g/m 2  and a metal content of at least 90%; and   at least one layer of nitrogen-doped graphene applied on at least one of said first surface and said second surface of said metal foil.   
     
     
         11 . The composite heat dissipating plate of  claim 10 , wherein said metal foil is a copper foil. 
     
     
         12 . The composite heat dissipating plate of  claim 10 , wherein said metal foil has a basis weight between 220 and 884 g/m 2 . 
     
     
         13 . The composite heat dissipating plate of  claim 10 , wherein said metal foil has a metal content of at least 98%. 
     
     
         14 . The composite heat dissipating plate of  claim 10 , wherein at least one of said first surface and said second surface has a roughness of 0.19≦Ra≦0.23 μm. 
     
     
         15 . The composite heat dissipating plate of  claim 10 , wherein at least one of said first surface and said second surface has a roughness of 1.3≦Rt≦1.84 μm. 
     
     
         16 . The composite heat dissipating plate of  claim 10 , wherein at least one of said first surface and said second surface has a roughness of 1.02≦Rz≦1.07 μm. 
     
     
         17 . The composite heat dissipating plate of  claim 10 , wherein said metal foil has crystal size between 308 and 434 Å. 
     
     
         18 . The composite heat dissipating plate of  claim 10 , wherein said metal foil has a lightness of surface colors of 25<L*<40.