Forged aluminum alloy spiral parts and method of fabrication the

Details Forged aluminum alloy spiral parts and method of fabrication the Forged aluminum alloy spiral parts and method of fabrication the

1988-05-23

1989-06-13

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75232, 75235, 75236, 75244, 419 10, 419 11, 419 12, 419 13, 419 17, 419 19, 419 23, 419 25, 419 39, 419 41, 419 42, 419 48, 419 53, C22C 3912

Patent

active

048389366

ABSTRACT:
Spiral parts, such as orbiting and fixed scroll plates having involute wraps, for use in scroll compressors, the parts having low coefficient of thermal expansion and high tensile strength and Young's modulus, are formed by combining a self-lubricating power into aluminum raw material powder prior to compression and forging. As an alternative to and in conjunction with the foregoing, temperatures during preform heating and in the die for forging are controlled to be in respective ranges of 300.degree. to 500.degree. C. and 150.degree. to 500.degree. C. Aluminum alloy fine powder preferably has a particle diameter no larger than 350 .mu.m. The self-lubricating powder preferably forms 1 to 25% of the mix by volume, and contains at least one member selected from the group consisting of graphite, BN, and MoS.sub.2. The aluminum raw material powder may contain at least one element selected from the group consisting of Cu, Mg, and Si, or a kind of compound particles from the group consisting of oxides, nitrides, borides, and carbides of Fe, Al, Mg, Ti, Zr, and Si.

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