Conversion coatings on silicon carbide

Details Conversion coatings on silicon carbide Conversion coatings on silicon carbide

1993-11-04

1995-05-23

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

427252, 427253, 4273766, 427377, 4273833, 427404, 4274191, C23C 1600

Patent

active

054180120

ABSTRACT:
A pack cementation method is described for producing conversion coatings on a ceramic. In particular, silicon carbide is coated with Cr.sub.2 O.sub.3 -forming compounds for improved sulfidation and ash-deposit resistance. The method is applicable to continuous fiber ceramic composites or a monolithic substrate. The conversion coatings are multilayered coating systems with the coating morphologies expressed as follows:

REFERENCES:
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patent: 5041309 (1991-08-01), Davis et al.
patent: 5135777 (1992-08-01), Davis et al.
patent: 5208071 (1993-05-01), Davis et al.
patent: 5209950 (1993-05-01), Schwartz et al.
patent: 5225246 (1993-07-01), Beers et al.
patent: 5242710 (1993-09-01), Claar et al.
S. C. Kung and R. A. Rapp, "Kinetics Study of Aluminization of Iron by Using the Pack Cementation Technique," J. Electrochem. Soc., vol. 135, No. 3, p. 731, 1988.

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