Appeal No. 1997-3260
Application 08/506,153
for making a high temperature oxidation resistant metal matrix
composite, wherein an alloy/fiber preform is used which has a
graduated fiber density such that the density is lower near
what will become the surface of the composite exposed to high
temperature, oxidizing conditions, and higher toward the
interior of the composite. A use for the composite is in
aerospace applications (specification, page 1). Claim 9 is
illustrative and reads as follows:
9. A method to produce high temperature oxidation
resistant metal matrix composites which comprises the steps of
(a) laying up an alloy/fiber preform consisting of a plurality
of alternating layers of metal alloy and fibers and (b)
consolidating the preform by heating the alloy-fiber preform
to a temperature below the beta-transus temperature of the
alloy while applying a pressure of at least 10 Ksi for a time
sufficient to effect consolidation, wherein the layers of
fibers in the preform are graduated so that fiber density is
lower nearer what will become the surface of the composite
exposed to high temperature, oxidizing conditions, and fiber
density is higher toward the interior of the composite.
THE REFERENCES
Eylon et al. (Eylon ‘816) 4,733,816 Mar. 29,
1988
Froes et al. (Froes) 4,746,374 May 24,
1988
Eylon et al. (Eylon ‘432) 4,822,432 Apr. 18,
1989
Wright et al. (Wright) 4,919,594 Apr. 24,
1990
Smith, Jr. et al. (Smith ‘460) 5,104,460 Apr. 14,
1992
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