Protective coating for alumina-silicon carbide whisker composite

Details Protective coating for alumina-silicon carbide whisker composite Protective coating for alumina-silicon carbide whisker composite

1987-10-26

1989-06-13

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501128, 264 60, C04B 3556, C04B 3510, C04B 3580

Patent

active

048393169

ABSTRACT:
Ceramic composites formed of an alumina matrix reinforced with silicon carbide whiskers homogenously dispersed therein are provided with a protective coating for preventing fracture strength degradation of the composite by oxidation during exposure to high temperatures in oxygen-containing atmospheres. The coating prevents oxidation of the silicon carbide whiskers within the matrix by sealing off the exterior of the matrix so as to prevent oxygen transport into the interior of the matrix. The coating is formed of mullite or mullite plus silicon oxide and alumina and is formed in place by heating the composite in air to a temperature greater than 1200.degree. C. This coating is less than about 100 microns thick and adequately protects the underlying composite from fracture strength degradation due to oxidation.

REFERENCES:
patent: 1356211 (1920-10-01), Linbarger
patent: 1546833 (1925-07-01), Geiger
patent: 2314758 (1943-05-01), Berns
patent: 2388080 (1945-10-01), Riddle
patent: 2644799 (1953-07-01), Robinson
patent: 2943008 (1960-06-01), Saunders
patent: 3230100 (1966-01-01), Davies et al.
patent: 3759725 (1973-09-01), Steen
patent: 4543345 (1985-09-01), Wei

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