Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1985-05-06
1986-08-12
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75230, 75236, 75241, 75244, 419 12, 419 14, 419 15, 419 23, 419 34, 419 38, 419 40, 419 47, 501 87, 501 93, 501 96, 501 98, 423289, 423439, C22C 2904
Patent
active
046054405
ABSTRACT:
Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. A method is provided, including the steps of wetting and reacting the starting materials, by which the microstructures in the resulting composites can be controllably selected. Starting compositions, reaction temperatures, reaction times, and reaction atmospheres are parameters for controlling the process and resulting compositions. The ceramic phases are homogeneously distributed in the metal phases and adhesive forces at ceramic-metal interfaces are maximized. An initial consolidation step is used to achieve fully dense composites. Microstructures of boron-carbide-aluminum cermets have been produced with modulus of rupture exceeding 110 ksi and fracture toughness exceeding 12 ksi.sqroot.in. These composites and methods can be used to form a variety of structural elements.
REFERENCES:
patent: 2746133 (1956-05-01), Lowe
patent: 3178807 (1965-04-01), Bergmann
patent: 3749571 (1973-07-01), Stibbs et al.
patent: 4104062 (1978-08-01), Weaver
Aksay Ilhan A.
Halverson Danny C.
Pyzik Aleksander J.
Carnahan L. E.
Hightower Judson R.
Lechert Jr. Stephen J.
Sartorio Henry P.
The United States of America as represented by the United States
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