Pb-FREE COPPER ALLOY SLIDING MATERIAL

Abstract

When a Cu—Sn—Bi had-particle based sliding material is used for sliding, Cu of Cu matrix flows and covers up Bi phase. Seizure resistance lowers as time passes. A Pb-free sliding material preventing the reduction of seizure resistance is provided. (1) Composition: from 1 to 15% of Sn, from 1 to 15% of Bi, from 0.02 to 0.2% of P, and from 1 to 10% of hard particles having an average diameter of from 50 to 70 μm, with the balance being Cu and unavoidable impurities. (2) Structure: Bi phase and the hard particles are dispersed in the copper matrix, and all of said hard particles are bonded to the copper matrix.

1 . A Pb-free sintered sliding material, which contains, by mass %, from 1 to 15% of Sn, from 1 to 15% of Bi, and from 1 to 10% of hard particles having an average diameter of from 50 to 70 μm, with the balance being Cu and unavoidable impurities, and in which Bi phase and the hard particles are dispersed in the copper matrix, characterized in that all of said hard particles are bonded to the copper matrix. 
     
     
         2 . A Pb-free sintered sliding material, which contains, by mass %, from 1 to 15% of Sn, from 1 to 15% of Bi, from 0.02 to 0.2% of P, and from 1 to 10% of hard particles having an average diameter of from 50 to 70 μm, with the balance being Cu and unavoidable impurities, and in which Bi phase and the hard particles are dispersed in the copper matrix, characterized in that all of said hard particles are bonded to the copper matrix. 
     
     
         3 . A Pb-free sintered sliding material according to  claim 1  or  2 , characterized in that said hard particles are an Fe—P based compound.