Iron-based mixture powder for sintering and iron-based sintered alloy

Abstract

There is provided an iron-based mixture powder for sintering, as well as an iron-based sintered alloy using same, that are capable of reducing the cutting resistance of the iron-based sintered alloy and of mitigating the shortening of cutting tool life even when a metal fluoride powder is used. The iron-based mixture powder for sintering comprises an iron-based powder, a graphite powder, a hard powder that is harder than the iron-based powder, and a metalfluoride powder. With respect to particle asperity as expressed by the following equation, particle asperity=(perimeter of a section of a particle) 2 /(sectional area of the section×4Pi), the particle asperity of the metal fluoride powder is within the range of 2 to 5.

1 - 7 . (canceled) 
     
     
         8 . An iron-based mixture powder for sintering, comprising:
 an iron-based powder;   a graphite powder;   a hard powder that is harder than the iron-based powder; and   a metal fluoride powder, wherein with respect to particle asperity as expressed by the following equation,
   particle asperity=(perimeter of a section of a particle) 2 /(sectional area of the section×4Pi),
 
   the particle asperity of the metal fluoride powder is within a range of 2 to 5.   
     
     
         9 . The iron-based mixture powder for sintering according to  claim 8 , wherein the metal fluoride powder comprises an alkaline earth metal fluoride powder. 
     
     
         10 . The iron-based mixture powder for sintering according to  claim 9 , wherein the alkaline earth metal fluoride powder comprises a strontium fluoride powder. 
     
     
         11 . The iron-based mixture powder for sintering according to  claim 9 , wherein 0.5 to 3 mass % of the alkaline earth metal fluoride powder is contained relative to the total amount of the iron-based mixture powder for sintering. 
     
     
         12 . The iron-based mixture powder for sintering according to  claim 9 , wherein the average particle size of the alkaline earth metal fluoride powder is within a range of 1 to 20 micrometers. 
     
     
         13 . The iron-based mixture powder for sintering according to  claim 9 , further comprising a silicone resin.