Mixed powder for powder metallurgy and green compact using the same

Abstract

A mixed powder for powder metallurgy to be used as a feedstock of a green compact includes an iron powder and/or an iron alloy powder, a component for improving mechanical properties, and a thermosetting resin powder. In the mixed powder, the thermosetting resin powder is composed of at least one resin selected from the group consisting of an epoxy-polyester-based resin, an epoxy-based resin, and an acrylic-based resin. In addition, the average particle diameter of the thermosetting resin powder is 100 μm or less, and the content of the thermosetting resin powder relative to the total amount of the iron powder and/or the iron alloy powder is 0.05 to 1.0 mass percent.

1 . A mixed powder for powder metallurgy to be used as a feedstock of a green compact, the mixed powder comprising: 
 an iron powder and/or an iron alloy powder;    a component for improving mechanical properties; and    a thermosetting resin powder,    wherein the thermosetting resin powder comprises at least one resin selected from the group consisting of an epoxy-polyester-based resin, an epoxy-based resin, and an acrylic-based resin,    the average particle diameter of the thermosetting resin powder is 100 μm or less, and    the content of the thermosetting resin powder relative to the total amount of the iron powder and/or the iron alloy powder is 0.05 to 1.0 mass percent.    
   
   
       2 . The mixed powder for powder metallurgy according to  claim 1 , further comprising a lubricant.  
   
   
       3 . The mixed powder for powder metallurgy according to  claim 2 , wherein the lubricant is at least one compound selected from the group consisting of ethylenebisstearamide, stearamide, zinc stearate, and lithium stearate.  
   
   
       4 . The mixed powder for powder metallurgy according to  claim 1 , wherein the component for improving mechanical properties is at least one substance selected from the group consisting of copper, nickel, chromium, molybdenum, graphite, and manganese sulfide.  
   
   
       5 . A green compact comprising the mixed powder for powder metallurgy according to  claim 1.