Hypo-eutectic aluminum-silicon-copper alloy having bismuth addit

Details Hypo-eutectic aluminum-silicon-copper alloy having bismuth addit Hypo-eutectic aluminum-silicon-copper alloy having bismuth addit

1991-07-22

1992-06-16

Dean, R.

Metal treatment

Stock

Aluminum base

148415, 148416, 420528, 420529, 420531, 420537, C22C 2100, C22C 2102

Patent

active

051222078

ABSTRACT:
An improved aluminum-silicon-copper alloy having a relatively high level of bismuth is provided which is particularly wear-resistant and sufficiently self-lubricating so as to be suitable for use in a wearing component even when poorly lubricated. The relatively high bismuth level within the alloy cooperates with the other elemental additions so as to provide a sufficiently low friction bearing surface (or self-lubricity), which significantly enhances the wear resistant properties of the alloy. In particular, the preferred aluminum alloy is suited for use in a socket plate which receives high strength steel bearing members within a compressor unit of an automobile air conditioning system. The improved aluminum alloy should minimize wear and alleviate galling of the socket plate during use. In addition, the improved aluminum alloy should have sufficient strength and ductility so as to permit swaging of the socket plate formed from the alloy around a balled end of the high strength steel bearing member.

REFERENCES:
patent: 4170469 (1979-10-01), Mori
Aluminum alloys A356 and A357 Elemental Composition taken from "Aluminum Casting Technology" published by the American Foundrymen's Society, Inc., Des Plaines, Illinois.

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