Hypo-eutectic aluminum-silicon alloy having tin and bismuth addi

Details Hypo-eutectic aluminum-silicon alloy having tin and bismuth addi Hypo-eutectic aluminum-silicon alloy having tin and bismuth addi

1991-07-22

1992-06-16

Dean, R.

Metal treatment

Stock

Aluminum base

148415, 148417, 148439, 420529, 420537, 420540, C22C 2100, C22C 2102

Patent

active

051222086

ABSTRACT:
An improved aluminum-silicon alloy having relatively substantial additions of tin and 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 tin and bismuth additions within the alloy cooperate 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 used to form a socket plate which receives high strength steel bearing members within a compressor unit of an automobile air conditioning system. The improved aluminum alloy minimizes wear and alleviates galling of the socket plate during use. In addition, the improved aluminum alloy is also characterized by good strength and sufficient ductility so as to permit swaging of the socket plate formed from the alloy around a balled end of the high strength steel bearing members.

REFERENCES:
Aluminum alloys A356 and A357 Elemental Composition taken from "Aluminum Casting Technology" published by the American Foundrymen's Society, Inc., Des Plaines, Ill.

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