US 5,114,468 A · Cu-base sintered alloy

Abstract

The present invention relates to a Cu-based sintered alloy which has a composition containing: Zn: 10-40%; Al: 0.3%-6% oxygen: 0.03-1%; any one selected, as an additional element from the group including at least one of Fe, Ni and Co: 0.1-5%, Mn: 0.1-5%, Si: 0.1-3%, and at least one of W and Mo: 0.1-3%; and the remainder including Cu and inevitable impurities. The alloy is superior in wear resistance particularly in air at temperatures ranging from the ordinary temperature to 400.degree. C., has high strength and high toughness, and further excels in the uniform temporal change characteristics with associated members, as evaluated by its friction coefficient. The invention relates also to parts for automotive equipment made of this Cu-base sintered alloy, such as synchronizer rings for transmission, valveguides for engines, bearings for turbo-chargers and so forth.

Claims28

Dependent claims

A Cu-based sintered alloy comprising a composition which contains on weight basis:

Zn in an amount from 10-40%, Al in an amount from 03.-6%, oxygen in the form of oxides, in an amount from 0.3-1%;
at least one additional element selected from the group consisting of (a) at least one of Fe, Ni and Co in an amount from 0.1-5%, (b) Mn in an amount from 0.1-5%, (c) Si in an amount from 0.1-3% and (d) at least one of W and Mo in an amount from 0.1-3%;
and
the remaining consisting of Cu and inevitable impurities;
said alloy having a structure in the matrix of which the oxides are distributed with a granule size ranging from 1 to 40 .mu.m, said intermetallic compounds being distributed with a granular size from 1 to 25 .mu.m.

2 more elements

Dependencies are inferred from the claim text.

Cu-base sintered alloy

Life of this patent

Cu-base sintered alloy

Life of this patent

Abstract

Claims28