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Aluminum-lead-engine-bearing-alloy-metallurgical-structure-and-method-of-making-same

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Aluminum-lead engine bearing alloy metallurgical structure and method of making same

Details

Inventors: Pratt, George C.; Whitney, Jr., Warren J.;
Assignee: Federal-Mogul Corporation (Southfield, MI)
Primary Examiner: Rosenberg; Peter D.
Assistant Examiner:
Attorney, Agent or Firm: Shurupoff; Lawrence J.

An aluminum-lead bearing alloy in continuously cast strip form has a lead content in excess of 1% by volume, 4% by weight. The lead phase consists of uniformly distributed spherical particles no more than 25 microns in diameter, and the content of all other constituents other than aluminum totals not more than 10% by weight, the balance being aluminum. The alloy is used in engine bearings wherein an aluminum-lead alloy lining is bonded to a steel backing.

DETAILED DESCRIPTION The present invention comprises a method of casting aluminum-lead alloys which suffers from none of the drawbacks associated with the above described prior art methods and which enables production of a cast and rolled aluminum-lead alloy product not having entrained oxide typical of aluminum product produced from powder metal.
The process economics are good and the bimetal lining after bonding of the alloy has no lead composition gradient and contains lead ribbons which are much shorter than those produced by existing casting processes used for aluminum-lead alloys.
The present invention also comprises a novel aluminum-lead microstructure with lead particles smaller by a factor of about 6 than are obtained by any other commercially practical casting process, such lead particles ranging from one to 25 microns in diameter and averaging 2 to 5 microns.
Such a microstructure has been shown to increase the load-carrying ability of bearings made from the aluminum-lead material cast by the disclosed method.

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