Method of forming tubular inclusions in single crystal alumina

Details Method of forming tubular inclusions in single crystal alumina Method of forming tubular inclusions in single crystal alumina

1997-04-30

1999-04-13

Fiorilla, Christopher A.

Coating processes

Heat decomposition of applied coating or base material

427255, 264620, 264621, 264640, B05D 302, C23C 1600

Patent

active

058940359

ABSTRACT:
A method of making a mechanically stable, fiber having an inclusion of ion-conducting material which includes the steps of coating a single-crystal or polycrystalline .alpha.-alumina fiber with a zirconia or a hexaluminate precursor, optionally heating the coated fiber to dry the coating, when the coating is applied as a suspension or sol, heating the coated fiber to a temperature of about 1000.degree. to 1800.degree. C. to promote the growth of alpha-alumina toothlike extensions in the coating and epitaxial formation of the zirconia or hexaluminate on the sides of the extensions, embedding the fiber in an .alpha.-alumina matrix material, and heating the resulting fiber-matrix composite to react and texture the coating and densify the assembly.

REFERENCES:
patent: 5573718 (1996-11-01), Shih et al.
patent: 5575964 (1996-11-01), Umezaki et al.
Michael K. Cinibulk and Randall S. Hay, "Textured Magnetoplumbite Fiber-Matrix Interphase Derived from Sol-Gel Fiber Coatings", J. Am.

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