Method of making self-supporting ceramic materials

C - Chemistry – Metallurgy – 04 – B

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C04B 35/10 (2006.01) C04B 35/65 (2006.01)

Patent

CA 1283770

ABSTRACT OF THE DISCLOSURE A method to produce a self-supporting ceramic structure by oxidation of a liquid phase (molten) parent metal with a vapor phase oxidizing environment includes applying a layer having at least one dopant material to at least a portion of a parent metal, Upon temperature elevation in the presence of an oxidant, e.g., air, the parent metal becomes molten and due to the dopant material in the layer, the molten metal is caused to migrate through any initial oxide skin and said layer so as to be exposed to the oxidizing atmosphere, whereupon the oxidation reaction product of the parent metal and the oxidizing atmosphere is formed. Migration of the parent metal continues through the previously formed oxidation reaction product to continuously form fresh oxidation reaction product, thus producing a body of oxidation reaction product through and beyond the depth of the applied dopant material layer, Suitable temperature and oxidizing conditions are maintained for a time sufficient to produce a self-supporting ceramic body.

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