Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1986-06-17
1988-01-12
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75244, 419 2, 419 12, 419 17, 419 30, 419 34, 419 63, C22C 2902
Patent
active
047189410
ABSTRACT:
A chemical pretreatment method is used to produce boron carbide-, boron-, and boride-reactive metal composites by an infiltration process. The boron carbide or other starting constituents, in powder form, are immersed in various alcohols, or other chemical agents, to change the surface chemistry of the starting constituents. The chemically treated starting constituents are consolidated into a porous ceramic precursor which is then infiltrated by molten aluminum or other metal by heating to wetting conditions. Chemical treatment of the starting constituents allows infiltration to full density. The infiltrated precursor is further heat treated to produce a tailorable microstructure. The process at low cost produces composites with improved characteristics, including increased toughness, strength.
REFERENCES:
patent: 3953177 (1976-04-01), Sedlatschek et al.
patent: 4585618 (1986-04-01), Fresnel et al.
patent: 4617053 (1986-10-01), Joo et al.
Halverson Danny C.
Landingham Richard L.
Ditzel Roger G.
Fikovsky Valentin
Lechert Jr. Stephen J.
Sartorio Henry P.
The Regents of the University of California
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