Cu-BASED SINTERED SLIDING MEMBER

Abstract

A Cu-based sintered sliding member that can be used under high-load conditions. The sliding member is age-hardened, including 5 to 30 mass % Ni, 5 to 20 mass % Sn, 0.1 to 1.2 mass % P, and the rest including Cu and unavoidable impurities. In the sliding member, an alloy phase containing higher concentrations of Ni, P and Sn than their average concentrations in the whole part of the sliding member, is allowed to be present in a grain boundary of a metallic texture, thereby achieving excellent wear resistance. Hence, without needing expensive hard particles, there can be obtained, at low cost, a Cu-based sintered sliding member usable under high-load conditions. Even more excellent wear resistance is achieved by containing 0.3 to 10 mass % of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.

1 . A Cu-based sintered sliding member that is age-hardened, said sliding member comprising:
 5 to 30% by mass of Ni;   5 to 20% by mass of Sn;   0.1 to 1.2% by mass of P; and   the rest including Cu and unavoidable impurities,   wherein said Cu-based sintered sliding member comprises an alloy phase present in a grain boundary of a metallic texture, said alloy phase including higher concentrations of Ni, P and Sn than average concentrations of Ni, P and Sn in the whole sliding member.   
     
     
         2 . The Cu-based sintered sliding member according to  claim 1 , further comprising 0.3 to 10% by mass of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders. 
     
     
         3 . The Cu-based sintered sliding member according to  claim 1 , further comprising 0.3 to 10% by mass of at least one solid lubricant selected from graphite and graphite fluoride. 
     
     
         4 . The Cu-based sintered sliding member according to  claim 1 , further comprising 0.3 to 10% by mass of at least one solid lubricant selected from among molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders. 
     
     
         5 . The Cu-based sintered sliding member according to  claim 2 , wherein at least one solid lubricant is selected from graphite and graphite fluoride, and at least one solid lubricant is selected from among molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.