Rotary expansible chamber devices – With wear surface treatment or integrally plated wear layer
Patent
1991-12-09
1992-09-22
Vrablik, John J.
Rotary expansible chamber devices
With wear surface treatment or integrally plated wear layer
418179, 921692, F04C 18344, F04C 2900, F01B 3100
Patent
active
051492571
ABSTRACT:
A compressor has a cylinder formed of an aluminum alloy, and a moving member slidably received within the cylinder. Hard particles are dispersed in the inner peripheral surface portion of the cylinder. The hard particles are formed of a chemical compound such as a nitride and a carbide. The cylinder is manufactured by preparing a first green compact formed of a mixture of a powdery material for the aluminum alloy and the hard particles and a second green compact formed solely of the powdery material, preparing a billet having an inner layer formed of the first green compact, and an outer layer formed of said second green compact, placing the billet in a preheated state into a container and further heating same therein, and fitting a mandrel through a central bore of the billet and pressurizing the billet to extrude same through a die hole in a die.
REFERENCES:
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patent: 4297976 (1981-11-01), Bruni et al.
patent: 4515513 (1985-05-01), Hayase et al.
patent: 4744738 (1988-05-01), Miki et al.
Diesel Kiki Co. Ltd.
Vrablik John J.
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