Patent ID: 6254701
Filing Date: 2001-07-03
Classification: B22F,B32B,C22C,F16C,Y10S

Abstract:
A copper alloy with a hexagonal or eutectic structure layer on the surface having improved seizure resistance, the copper alloy consisting of:Cu;at least one element selected from the group consisting of Ag, Sn, from 1 to 15% by weight of Sb, from 1 to 15% by weight of In, from 0.1 to 5% by weight of Mn, from 0.01 to 10% by weight of Fe, from 1 to 30% by weight of Zn, Ni and from 1 to 5% by weight of Cr;and unavoidable impurities including Si, O and S;said copper alloy being subjected to a treatment to keep said at least one element in solid solution under the non-equilibrium state said Si not forming a precipitate, and said S being present as a Cu--S secondary phase, wherein said at least one element reacts with sulfur and oxygen of lubricating oil and forms a hexagonal or eutectic structure layer on the surface of the alloy.