Sintered sliding member having exceptional corrosion resistance, heat resistance, and wear resistance; and method for producing said member

Abstract

A sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance is provided. The sintered sliding material has a composition made of: 36-86 mass % of Ni; 1-11 mass % of Sn; 0.05-1.0 mass % of P; 1-9 mass % of C; and the Cu balance including inevitable impurities. The sintered sliding material is made of a sintered material of a plurality of grains of alloy of Ni—Cu alloy or Cu—Ni alloy, the Ni—Cu alloy and the Cu—Ni alloy containing Sn, P, C, and Si; has a structure in which pores are dispersedly formed in grain boundaries of the plurality of the grains of alloy; and as inevitable impurities in a matrix constituted from the grains of alloy, a C content is 0.6 mass % or less and a Si content is 0.15 mass % or less.

1 - 13 . (canceled) 
     
     
         14 . A method of producing a sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance, the method comprising the steps of:
 obtaining a mixed powder by mixing a plurality of powders containing one or more among Cu, Ni, Sn, P, and C in such a way that a total composition of the mixed powder becomes: 36-86 mass % of Ni; 1-11 mass % of Sn; 0.05-1.0 mass % of P; 1-9 mass % of C; and the Cu balance by using at least one of: a Cu—Ni alloy powder in which a C content is 0.6 mass % or less and a Si content is 0.15 mass % or less as inevitable impurities; and a Ni—Cu alloy powder in which a C content is 0.6 mass % or less and a Si content is 0.15 mass % or less as inevitable impurities;   producing a green compact by pressing the mixed powder; and   obtaining a sintered sliding material having a structure containing: an integrated matrix; and free graphite dispersed in a plurality of pores by sintering the green compact at 960-1140° C. so that a plurality of grains of alloy made of a Cu—Ni alloy or a Ni—Cu alloy disperse in the plurality of pores in the grain boundaries of the plurality of grains of alloy.   
     
     
         15 . The method of producing a sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance according to  claim 14 , wherein the mixed powder is obtained by mixing: at least one of a Cu—Ni alloy powder and a Ni—Cu alloy powder; a Sn powder; a Cu—P alloy powder; and C powder. 
     
     
         16 . The method of producing a sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance according to  claim 14 , wherein a porosity of the sintered material is 8-28%. 
     
     
         17 . The method of producing a sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance according to  claim 14 , wherein as inevitable impurities in the matrix, a C content is 0.002 mass % to 0.6 mass %, and a Si content is 0.015 mass % to 0.15 mass %.