Aluminum bronze

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The aluminum bronzes are the strongest andmost complex of the copper-based bearing alloys. Their aluminum contentprovides most of their high strength and makes them the only bearing bronzescapable of being heat treated. Their high strength, up to 68,000 psi yield and120,000 tensile, permits them to be used at unit loads up to 50 percent higherthan those for leaded tin bronze Alloy C93200.

Because of their high strength, however, theyhave fairly low ductility and do not conform or embed well. They consequentlyrequire shafts hardened to 55-60 HRC. Surfaces must also be extremely smooth,with both shaft and bearing finished to 1520 in RMS. Careful attention should be given to lubricantcleanliness and reliability, the latter because these alloys do not have theanti-seizing properties typical of the leaded and tin bearing bronzes. On theother hand, the aluminum bronzes have excellent corrosion resistance and areideally suited for such applications as marine propellers and pump impellers.The aluminum bronzes also have superior elevated temperature strength. They arethe only bronzes - and the only conventional bearing material able to operateat temperatures exceeding 50OF
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