Dense skin ceramic structure and method of making the same

Details Dense skin ceramic structure and method of making the same Dense skin ceramic structure and method of making the same

C - Chemistry, Metallurgy

04

B

25/141

C04B 35/10 (2006.01) C04B 35/65 (2006.01) C22C 29/12 (2006.01)

Patent

CA 1315076

-31 - ABSTRACT The invention concerns self-supporting ceramic structures, including ceramic composite structures embedding a filler, and methods of making them. The ceramic structures comprise a polycrystlline material made by oxidation of a body of molten parent metal with an oxidant. The poly- crystalline material has a first region substrate surmounted by a terminal region stratum which is integral with the first region. The terminal region stratum which is harder and of denser, finer crystalline structure than the first region substrate and is formed in a reaction stage subsequent to the reaction stage in which the first region of polycrystalline material is formed. Growth of the first stage is attained by by attenuating or interrupting the transport of molten parent metal to the first region under conditions which nonetheless leave or maintain therein enough oxidizable molten parent metal to form the polycrystalline material of the terminal region.

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