Composite material for a sliding bearing comprising an aluminum bearing metal layer

A sliding-bearing composite material, comprising a supporting layer including steel, an intermediate layer based on an aluminium alloy that is free of lead except for impurities, and a bearing metal layer based on an aluminium alloy that is free of lead except for impurities,

• wherein the aluminium alloy of the intermediate layer has a composition having, based on the total weight of the aluminium alloy of the intermediate layer,
• 3.5 to 4.5 wt % copper,
• 0.1 to 1.5 wt % manganese,
• 0.1 to 1.5 wt % magnesium,
• optionally silicon, the silicon ranging from 0.1 to 1.0 wt % if present,
• optionally iron, the iron ranging from 0.05 to 1.0 wt % if present,
• optionally chromium, the chromium ranging from 0.05 to 0.5 wt % if present,
• optionally zirconium and/or titanium, the zirconium and/or titanium ranging from 0.05 to 0.25 wt % in total if present,
• optionally other alloy constituents other than the impurities, the other alloy constituents in an amount of not more than 0.1 wt % individually if present and not more than 0.25 wt % in total of if present,
• and the impurities, the remainder being aluminium,
• and wherein the aluminium alloy of the bearing metal layer has a composition having, based on the total weight of the aluminium alloy of the bearing metal layer,
• 6.0-8.0 wt % tin,
• 1.0-3.0 wt % nickel,
• 0.5-1.0 wt % manganese,
• 0.5-1.0 wt % copper,
• 0.15-0.25 wt % chromium,
• 0.1-0.3 wt % vanadium,
• optionally zirconium, the zirconium ranging from 0.1-0.2 wt % if present,
• optionally titanium, the titanium in an amount of up to 0.2 wt % if present,
• optionally other elements other than the impurities, the other elements in an amount of less than 0.5 wt % of other elements if present,
• and the impurities,
• the remainder being aluminium.