Composite bodies and methods for making same

Details Composite bodies and methods for making same Composite bodies and methods for making same

1995-06-07

2000-09-05

Speer, Timothy

Coating processes

Coating by vapor, gas, or smoke

427249, 4272554, 501 87, C23C 1600

Patent

active

061139823

ABSTRACT:
This invention relates generally to a novel directed metal oxidation process which is utilized to produce self-supporting bodies. In some of the more specific aspects of the invention, a parent metal (e.g., a parent metal vapor) is induced to react with at least one solid oxidant-containing material to result in the directed growth of a reaction product which is formed from a reaction between the parent metal and the solid oxidant-containing material. The inventive process can be utilized to form bodies having substantially homogeneous compositions, graded compositions, and macrocomposite bodies.
In a preferred embodiment, the reaction product may be chemically modified or a different reaction product may be coated thereon. Specifically, once a first reaction product is formed on a solid oxidant-containing material, the formed body may be exposed to a vapor-phase parent metal different from the first parent metal. Alternatively the formed body may be exposed to a vapor-phase oxidant having a different chemical composition then the solid oxidant-containing material. Still further, a non-stoichiometric reaction product deficient in the oxidant component may be made more stoichiometric by heating the self-supporting body in the absence of reaction product growth conditions at a temperature and for a time sufficient to effect diffusion of additional oxidant from the solid oxidant-containing material into the sub-stoichiometric reaction product, thereby increasing its stoichiometry.

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Y. Isobe, Y. Yazawa, P. Son and M. Miyake, "Chemically Vapour-Deposited Mo/Re Double-Layer Coating on Graphite at Elevated Temperatures", Journal of Less-Common Metals, pp. 239-250, vol. 152, 1989, Elsevier Sequoai, The Netherlands.

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