Machine component using powder compact and method for producing same

Abstract

A machine part having a radial crushing strength of more than 100 MPa is manufactured by: press forming raw material powder containing, as a main raw material, metal powder capable of forming an oxide film, to thereby provide a green compact; and forming the oxide film between particles of the metal powder forming the green compact through steam treatment.

1 . A machine part, comprising a green compact obtained by press forming raw material powder containing, as a main raw material, metal powder capable of forming an oxide film,
 wherein:   the oxide film is formed between particles of the metal powder; and   the machine part has a radial crushing strength of more than 100 MPa.   
     
     
         2 . The machine part according to  claim 1 , wherein the green compact has a green density measured by a dimension measurement method falling within a range of from 5.0 g/cm 3  to 7.6 g/cm 3 . 
     
     
         3 . The machine part according to  claim 1 , wherein the oxide film is formed through steam treatment. 
     
     
         4 . The machine part according to  claim 3 , wherein treatment temperature of the steam treatment is 400° C. or more and 550° C. or less. 
     
     
         5 . The machine part according to  claim 1 , wherein the machine part has a sliding surface configured to slide with respect to a mating member through intermediation of a lubricating oil. 
     
     
         6 . A method of manufacturing a machine part having a radial crushing strength of more than 100 MPa, the method comprising:
 press forming raw material powder containing, as a main raw material, metal powder capable of forming an oxide film, to thereby provide a green compact; and   forming the oxide film between particles of the metal powder forming the green compact through steam treatment.   
     
     
         7 . The method of manufacturing a machine part according to  claim 6 , wherein the green compact has a green density measured by a dimension measurement method falling within a range of from 5.0 g/cm 3  to 7.6 g/cm 3 . 
     
     
         8 . The method of manufacturing a machine part according to  claim 6 , further comprising, before the steam treatment, degreasing a powder lubricant component in the green compact added for forming of the green compact. 
     
     
         9 . The method of manufacturing a machine part according to  claim 6 , wherein treatment temperature of the steam treatment is 400° C. or more and 550° C. or less.