Method for Integrally Forming Multiple Metal Materials as a Metal Object

Abstract

An integral forming method for a composite metal includes: a preparation step including preparing powders of at least two metals or alloys; a formation step including producing a single blank from the powders of one of the at least two metals or alloys by pressing molding or metal injection molding, and then producing a composite metal blank from the single blank and the powders of a remainder of the at least two metals or alloys; and a sintering step including sintering the composite metal blank into a composite metal product. The processing procedures are simplified, and the production is easier. Limitation to the choices of materials is small. The bonding strength of the composite metal is enhanced.

1 . An integral forming method for a composite metal comprising:
 preparing powders of at least two metals or alloys;   pressing the powders of one of the at least two metals or alloys into a single blank by pressing molding;   pressing the single blank and the powders of a remainder of the at feast two metals or alloys into a composite metal blank; and   sintering the composite metal blank into a composite metal product.   
     
     
         2 . The integral forming method for a composite metal according to  claim 1 , wherein the pressing molding is carried out at a predetermined pressure in a range of 20-100 tons. 
     
     
         3 . An integral forming method for a composite metal comprising:
 preparing powders of at least two metals or alloys;   injecting the powders of one of the at least two metals or alloys into a mold to form a single blank by metal injection molding;   placing the single blank in another mold and injecting the powders of a remainder of the at least two metals or alloys into the other mold to form a composite metal blank; and   sintering the composite metal blank into a composite metal product.   
     
     
         4 . The integral forming method for a composite metal according to  claim 3 , further comprising adding a binder into the powders of the at least two metals or alloys when forming the single blank or the composite metal blank by metal injection molding. 
     
     
         5 . The integral forming method for a composite metal according to  claim 4 , further comprising removing the binder from the composite metal blank before sintering the composite metal blank, wherein removing the binder includes removing the binder by heating. 
     
     
         6 . The integral forming method for a composite metal according to  claim 4 , wherein the binder is polyvinyl alcohol, polyvinyl acetate, or paraffin. 
     
     
         7 . The integral forming method for a composite metal according to  claim 1 , wherein sintering includes heating the composite metal blank to a predetermined temperature for a predetermined period of time, wherein the predetermined temperature is lower than melting points of the powders of the at least two metals or alloys. 
     
     
         8 . The integral forming method for a composite metal according to  claim 7 , wherein the predetermined temperature is 1370-1450° C., and wherein the predetermined period of time is an hour. 
     
     
         9 . The integral forming method for a composite metal according to  claim 1 , further comprising trimming a surface on the composite metal product after sintering. 
     
     
         10 . The integral forming method for a composite metal according to  claim 3 , wherein sintering includes heating the composite metal blank to a predetermined temperature for a predetermined period of time, wherein the predetermined temperature is lower than melting points of the powders of the at least two metals or alloys. 
     
     
         11 . The integral forming method for a composite metal according to  claim 10 , wherein the predetermined temperature is 1370-1450° C., and wherein the predetermined period of time is an hour. 
     
     
         12 . The integral forming method for a composite metal according to  claim 3 , further comprising trimming a surface on the composite metal product after sintering.