Cu-BASED SINTERED BEARING AND PRODUCTION METHOD FOR Cu-BASED SINTERED BEARING

Abstract

Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu-Ni-based main phase grains is 0.02-0.10 mass %.

1 - 16 . (canceled) 
     
     
         17 . A method of producing a Cu-based sintered bearing, the method comprising the steps of:
 mixing one or more raw material powders containing: 15 mass % or more and 36 mass % or less of Ni; 3 mass % or more and 13 mass % or less of Sn; 0.05 mass % or more and 0.55 mass % or less of P; and 0.02 mass % or more and 0.10 mass % or less of C; and the Cu balance containing inevitable impurities to obtain a mixed powder;   press-molding the mixed powder to obtain a green compact; and   sintering the green compact after the step of press-molding.   
     
     
         18 . The method of producing a Cu-based sintered bearing according to  claim 17 , wherein a total amount of C of a C content included in the raw material powder and a C content originated from the free graphite is 0.02 mass % or more and 4 mass % or less. 
     
     
         19 . The method of producing a Cu-based sintered bearing according to  claim 17 , wherein the raw material powders are a Cu—Ni alloy powder, a Sn powder, and a Cu—P alloy powder. 
     
     
         20 . The method of producing a Cu-based sintered bearing according to  claim 18 , wherein the raw material powders are a Cu—Ni alloy powder, a Sn powder, and a Cu—P alloy powder.