Copper-Lead Bimetal Bearings & Bushes
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Copper Powder Metallurgy for Bearings:. Copper readily forms a protective oxide film when heated in air. . Copper readily forms a protective sulphide film with oils containing only traces of sulphur compounds. . Copper has a high thermal conductivity for the dissipation of the frictional heat, thus reducing the surface temperature. . Tin strengthens copper and hardens it sufficiently to be compatible with unhardened steel. . The protective Organo-tin films formed with oils have a high desorption temperature . Hence the copper-tin bronzes result in better bearings than the copper-zinc brasses. . Copper alloys usually have a face-centered-cubic structure while the mating surface is usually a ferrous alloy with a body-centered-cubic structure. This difference contributes to the anti-seizure characteristics of copper alloys against iron alloys. Overlay Plated Copper-Lead Bearings for Heavy Duty Service:. The Copper-Lead Bearings when plated have higher load carrying capacity than straight copper-lead alloys.. These overlays are very soft and have excellent embeddability, conformability and corrosion resistance without impairing higher fatigue strength of inner copper-lead-tin alloy.
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