Coating for carbon-carbon composites and method for producing sa

Details Coating for carbon-carbon composites and method for producing sa Coating for carbon-carbon composites and method for producing sa

1991-03-29

1999-03-02

Nelson, Peter A.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

427113, 427380, 428145, 428325, 428331, B32B 900, B05D 512

Patent

active

058768505

ABSTRACT:
A coating for sealing carbon-carbon composites against hydrogen. The coating comprises a first layer of silicon carbide and a second layer of a glass, glass-ceramic or a low-melting-point metal such as tin or an alloy thereof. Particularly when such second layer is a glass, e.g. an SiO.sub.2 -containing glass, or a glass-ceramic, preferably the silicon carbide coating is pretreated, e.g. by oxidation thereof to form a thin layer of SiO.sub.2 prior to application of the glass layer. The glass layer can be an SiO.sub.2 glass formed by sputtering or by decomposition of tetraethylorthosilicate (TEOS) applied to the oxidized silicon carbide coating. An alkali metal oxide, e.g. Na.sub.2 O, or an alkaline earth metal oxide, e.g. BaO, can be added to the SiO.sub.2 glass.

REFERENCES:
patent: 4585675 (1986-04-01), Shuford
patent: 4613522 (1986-09-01), Vasilos
patent: 4892790 (1990-01-01), Gray

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