Composite ceramic articles

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1993-02-16

1994-08-02

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 96, 501103, 501133, C04B 3565

Patent

active

053345622

ABSTRACT:
Self-supporting ceramic composite structures having filler embedded therein are taught as being produced by a method which includes infiltrating a permeable mass of filler with polycrystalline material comprising an oxidation reaction product obtained by oxidation of a parent metal such as aluminum and optionally containing therein non-oxidized constituents of the parent metal. The structure is formed by placing a parent metal adjacent to a permeable filler and heating the assembly to melt the parent metal and provide a molten body of parent metal which is contacted with a suitable vapor-phase oxidant. Within a certain temperature region and optionally aided by one or more dopants in or on the parent metal, molten parent metal will migrate through previously formed oxidation reaction product into contact with the oxidant, causing the oxidation reaction product to grow so as to embed the adjacent filler and provide the composite structure.

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"Oxidation of Molten Aluminum Alloys, Reaction with Refractories", M. Drouzy and M. Richard, Mar. 1974 Fonderie, France No. 332 pp. 121-128.
"Refractories for Aluminum Alloy Melting Furnaces" B. Clavaud and V. Jost, Sep. 1980, Lillian Brassinga (from French) Jan. 1985.

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