Metal powder for powder metallurgy and sintered body

Abstract

There is provided a metal powder for powder metallurgy including Zr and Si in a manner such that following conditions of (A) and (B) are satisfied, wherein a remainder thereof includes at least one element selected from the group consisting of Fe, Co and Ni, (A) the mass ratio of a content of Zr to a content of Si is 0.03 to 0.3, and (B) the content of Si is 0.35 to 1.5% by mass.

What is claimed is: 
     
         1 . A metal powder for powder metallurgy comprising:
 Zr and Si in a manner such that following conditions of (A) and (B) are satisfied:   (A) the mass ratio of a content of Zr to a content of Si is 0.03 to 0.3, and   (B) the content of Si is 0.35 to 1.5% by mass,   wherein a remainder thereof includes a low alloy steel that includes at least one metal element selected from the group consisting of Fe, Co and Ni.   
     
     
         2 . The metal powder for powder metallurgy according to  claim 1 , wherein the content of Zr is 0.015 to 0.3% by mass. 
     
     
         3 . The metal powder for powder metallurgy according to  claim 1 , further comprising:
 C (carbon), wherein a mass ratio of a content of C to the content of Si is 0.001 to 3.   
     
     
         4 . The metal powder for powder metallurgy according to  claim 3 , wherein a content of C is 0.001 to 2.5% by mass. 
     
     
         5 . The metal powder for powder metallurgy according to  claim 3 , wherein the metal element includes Fe,
 the content of Zr is 0.03 to 0.1% by mass,
 the content of Si is 0.5 to 0.8% by mass, and 
 the content of C is 0.1 to 0.7% by mass. 
   
     
     
         6 . The metal powder for powder metallurgy according to  claim 1 , wherein the metal element is a metal element corresponding to a composition where an atomic arrangement at a sintering temperature is a face-centered cubic lattice. 
     
     
         7 . The metal powder for powder metallurgy according to  claim 1 , wherein the metal element, Zr, and Si form an alloy or an intermetallic compound. 
     
     
         8 . The metal powder for powder metallurgy according to  claim 1 , wherein a mean particle size is 1 to 30 μm. 
     
     
         9 . The metal powder for powder metallurgy according to  claim 1 , wherein the metal powder for powder metallurgy is produced by an atomizing method. 
     
     
         10 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 1  into a predetermined shape, and sintering the obtained green part. 
     
     
         11 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 2  into a predetermined shape, and sintering the obtained green part. 
     
     
         12 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 3  into a predetermined shape, and sintering the obtained green part. 
     
     
         13 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 4  into a predetermined shape, and sintering the obtained green part. 
     
     
         14 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 5  into a predetermined shape, and sintering the obtained green part. 
     
     
         15 . A sintered compact that is produced by molding the metal powder for powder metallurgy according to  claim 6  into a predetermined shape, and sintering the obtained green part. 
     
     
         16 . The sintered compact according to  claim 11 ,
 wherein a relative density is 96% or more.   
     
     
         17 . The sintered compact according to  claim 12 ,
 wherein a relative density is 96% or more.   
     
     
         18 . The sintered compact according to  claim 13 ,
 wherein a relative density is 96% or more.   
     
     
         19 . The sintered compact according to  claim 14 ,
 wherein a relative density is 96% or more.   
     
     
         20 . The sintered compact according to  claim 15 ,
 wherein a relative density is 96% or more.