Production of the metallic parts with the alloyed layer containing dispersed compound particles, and the wear-proof parts

Abstract

A powder of an alloy containing a compound is enclosed in a cylindrical container, hot isostatic press and/or hot extrusion are applied in that state, and compound is isolated by these workings in order to metallically bond the powders with each other. When the metallic part is inserted into the container or the metallic part has a cylindrical shape, the container is formed of a material which can be the metallic part. Then, machining is applied in order to produce a metallic part having on a surface thereof an alloyed layer containing the dispersed compound particles. The metallic parts having on a surface thereof an alloyed layer containing dispersed compound particles can be produced without using a joining method such as welding.

What is claimed is:  
     
         1 . A method for producing a metallic part having on a surface thereof an alloyed layer containing dispersed compound particles, comprising: 
 enclosing a powder of an alloy containing the compound in a cylindrical metallic container;    applying at least one hot plastic working selected from hot isostatic press and hot extrusion in that state;    segmenting the compound by the hot plastic working and metallically bonding the powders with each other and the powder with the metallic container; and    then applying machining to manufacture a cylindrical metallic part having on an inner surface thereof an alloyed layer containing the dispersed compound particles.    
     
     
         2 . The method for producing the metallic part according to  claim 1 , wherein the alloy containing the compound is formed of a nickel-base alloy, a cobalt-base alloy or an iron-base alloy containing the compound which is formed of at least one selected from a silicide, a boride and a carbide.  
     
     
         3 . The method for producing the metallic part according to  claim 2 , wherein the nickel-base alloy consists of 
 not more than 8 weight % Si    0 to 4 weight % B    7 to 30 weight % Cr    not more than 1.2 weight % C    0 to 5 weight % of W    not more than 42 weight % of Fe which does not exceed an amount of Ni    with a balance of Ni.    
     
     
         4 . The method for producing the metallic part according to  claim 1 , wherein the powder consists of an alloy powder manufactured by atomization from a molten metal of the alloy.  
     
     
         5 . The method for producing the metallic part according to  claim 4 , wherein the alloy powder consists of a gas atomized powder manufactured by an inert gas atomization.  
     
     
         6 . The method for producing the metallic part according to  claim 4 , wherein the alloy powder consists of an alloy powder containing a compound dendritically precipitated in a powder production process.  
     
     
         7 . The method for producing the metallic part according to  claim 1 , wherein a gas in the container is evacuated when enclosing the alloy powder in the metallic container.  
     
     
         8 . A method for producing a metallic part having on a surface thereof an alloyed layer containing dispersed compound particles, comprising: 
 enclosing a powder of an alloy containing the compound and the metallic part in a container;    applying at least one hot plastic working selected from hot isostatic press and hot extrusion in that state;    segmenting the compound by the hot plastic working and metallically bonding the powder with each other and the powder with the metallic part; and    then applying machining to manufacture a metallic part having on a surface thereof an alloyed layer containing the dispersed compound particles.    
     
     
         9 . The method for producing the metallic part according to  claim 8 , wherein the alloy containing the compound is formed of a nickel-base alloy, a cobalt-base alloy or an iron-base alloy containing the compound formed of at least one selected from a silicide, a boride and a carbide.  
     
     
         10 . The method for producing the metallic part according to  claim 9 , wherein the nickel-base alloy consists of 
 not more than 8 weight % Si    0 to 4 weight % B    7 to 30 weight % Cr    not more than 1.2 weight % C    0 to 5 weight % of W    not more than 42 weight % of Fe which does not exceed an amount of Ni    with a balance of Ni.    
     
     
         11 . The method for producing the metallic part according to  claim 8 , wherein the powder consists of an alloy powder manufactured by atomization from a molten metal of the alloy.  
     
     
         12 . The method for producing the metallic part according to  claim 11 , wherein the alloy powder consists of a gas atomized powder manufactured by an inert gas atomization.  
     
     
         13 . The method for producing the metallic part according to  claim 11 , wherein the alloy powder consists of an alloy powder containing a compound dendritically precipitated in a powder production process.  
     
     
         14 . A wear-proof part having on a wearing surface an alloyed layer containing dispersed compound particles, wherein the alloyed layer containing the dispersed compound particles is obtained by at least one hot plastic working selected from hot isostatic press and hot extrusion, and it is integrated with the wear-proof part through the hot plastic working.  
     
     
         15 . The wear-proof part according to  claim 14 , wherein the alloyed layer is formed of a nickel-base alloy, a cobalt-base alloy or an iron-base alloy, and the compound particles comprise at least one selected from a silicide, a boride and a carbide.  
     
     
         16 . The wear-proof part according to claim. 15, wherein the nickel-base alloy consists of 
 not more than 8 weight % Si    0 to 4 weight % B    7 to 30 weight % Cr    not more than 1.2 weight % C    0 to 5 weight % of W    not more than 42 weight % of Fe which does not exceed an amount of Ni    with a balance of Ni.    
     
     
         17 . The wear-proof part according to  claim 14 , wherein the metallic part is formed of one selected from a carbon steel, a low-alloy steel and a stainless steel.  
     
     
         18 . The wear-proof part according to  claim 14 , wherein a surface of the alloyed layer has a coating layer of a ceramic film which is harder than the alloyed layer.