Method for making self-supporting composite bodies

Details Method for making self-supporting composite bodies Method for making self-supporting composite bodies

1997-03-11

1999-01-05

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

427249, 4272554, C23C 1630

Patent

active

058559558

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, a substance comprising a filler material and a solid oxidant, preferably an admixture of particulates, is coated onto at least a portion of the solid oxidant-containing material. Such a technique is particularly advantageous for forming relatively thick reaction product layers which might not otherwise develop to the desired thickness using the original "directed growth" embodiment. In a particularly preferred embodiment, the solid oxidant and the solid oxidant-containing material have the same chemical composition, and the filler material and the reaction product have the same chemical composition.

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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. (no month).

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