Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1992-03-12
1994-11-01
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428289, 4283122, 4283126, 4283128, 4283179, 428375, 428404, 428614, 428689, 428698, 501 88, 501 95, 164 97, 164100, 164101, C04B 3556, B22D 1900, B32B 326
Patent
active
053606620
ABSTRACT:
Sintered ceramic preforms for metal matrix composites fabricated by a method comprising: (a) preparing a homogeneous mixture containing appropriate amounts of silicon-containing fibers/particulates, such as silicon carbide, at least one solvent, at least one polymer, and an oxide-containing material, such as boric acid or phosphoric acid, capable of forming a low melting silicate with a silicon oxide, such as a borosilicate; (b) shaping a green ceramic preform from the mixture, such as by injection molding; (c) removing the solvent(s) and the polymer(s); (d) oxidizing the surfaces of the silicon-containing fibers to form a layer of the silicon oxide thereon; (e) heating the preform to a temperature sufficient to react the oxide-containing material with the silicon oxide to form the low melting silicate material; (f) liquid phase sintering the fibers in the presence of liquid silicate material to strengthen the preform; and (g) cooling the sintered preform to ambient. The sintered ceramic preform prepared by this method is sufficiently strong to withstand pre-infiltration handling and squeeze casting to inject molten metal under pressure into the pores of the preform.
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Denson-Low W. K.
Hughes Aircraft Company
Lachman M. E.
Lesmes George F.
Sales M. W.
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