Porous ceramic composite with dense surface

Details Porous ceramic composite with dense surface Porous ceramic composite with dense surface

1991-05-13

1992-08-18

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501128, 4283126, 4283128, 428218, C04B 3502

Patent

active

051399776

ABSTRACT:
There is disclosed a method for making a self-supporting ceramic composite article having a porous core bearing a dense surface layer formed integrally with said core. A preform comprises a filler material and parent metal distributed therethrough, wherein the volume percent of parent metal is sufficient to form a volume of oxidation reaction product exceeding the total volume available within said preform. The parent metal is melted and reacted with an oxidant to form an oxidation reaction product filling the spatial volume and leaving voids. The reaction is continued to further transport molten parent metal through the oxidation reaction product to at least one surface of the preform to form oxidation reaction product on said surface substantially free of voids thereby forming a relatively dense surface layer.

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