Composite material for a sliding bearing

Abstract

The invention relates to a method for producing a sliding bearing composite material (), having a support layer (), in particular made of steel, a bearing metal layer () made of a lead-free aluminum base alloy containing magnesium, and a running layer (), wherein the aluminum base alloy ultimately comprises 0.5-5.5% by weight magnesium, optionally one or more alloy components from the group comprising zinc, copper, silicon, iron, manganese, chromium, titanium, zirconium, vanadium, nickel, cobalt, cerium, and alloy components resulting from impurities, the sum of the latter not exceeding 1% by weight, and the remainder being aluminum, wherein the aluminum base alloy is copper-free or contains at most 3% by weight copper, the total content of zinc, copper, and nickel does not exceed 8% by weight, and the total content of all alloy components does not exceed 12% by weight. The bearing metal layer () is either rolled directly onto the support layer () or roll-cladded beforehand with an intermediate layer () made of an aluminum alloy or technical pure aluminum and then rolled onto the support layer () with this intermediate layer () in between, in such a way that the intermediate layer () subsequently has a thickness of at most 100 μm, in particular at most 50 μm, wherein the composite of the support layer () and the bearing metal layer () thus obtained is soft-annealed at temperatures between 280° and 350° C. for 2 to 10 hours so that the bearing metal layer of the composite has a Brinell hardness of 50-80 HB 1/5/30. The running layer () is subsequently applied galvanically or by means of a PVD method to the bearing metal layer ().