Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1987-07-01
1988-02-02
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
42 7602, 89 16, 419 9, 419 13, 419 17, 419 19, 419 26, 419 28, 419 49, 419 60, 419 68, B22F 700
Patent
active
047228253
ABSTRACT:
A method of producing a metal/ceramic composite structure in which an uncolidated metal or metal alloy powder is loaded into a sealable glass mold comprising a hollow ceramic sleeve and a sealable outer glass envelope surrounding the ceramic sleeve and forming with the outer wall of the ceramic sleeve a sealable chamber for the metal or metal alloy powder, wherein the glass is a type which becomes plastic when heated. The air in the mold is removed under vacuum and the mold is sealed and placed into a free flowing refractory powder in a crucible and consolidated by sintering under atmospheric pressure (CAP.RTM. process). Removal of the glass envelope leaves a composite article having a consolidated metal or metal alloy layer surrounding and placing a hollow ceramic liner (sleeve) under both radial and axial compression. A ceramic-line metal gun barrel insert can be produced by using a ceramic sleeve with rifling on its inner surface.
REFERENCES:
patent: 3900317 (1975-08-01), Meadus et al.
patent: 4426248 (1984-01-01), Jackson
patent: 4491557 (1985-01-01), Breitmoser et al.
patent: 4537742 (1985-08-01), Siemers et al.
patent: 4564501 (1986-01-01), Goldstein
patent: 4665828 (1987-05-01), Aver
Johnson Roger D.
Lechert Jr. Stephen J.
The United States of America as represented by the Secretary of
Walden Kenneth E.
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