COATING FOR CARBON-CARBON COMPOSITES AND METHOD FOR PRODUCING SAME

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 SiO2 -containing glass, or a glass-ceramic, preferably the silicon carbide coating is pretreated, e.g. by oxidation thereof to form a thin layer of SiO2 prior to application of the glass layer. The glass layer can be an SiO2 glass formed by sputtering or by decomposition of tetraethylorthosilicate (TEOS) applied to the oxidized silicon carbide coating. An alkali metal oxide, e.g. Na2 O, or an alkaline earth metal oxide, e.g. BaO, can be added to the SiO2 glass.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1RAYMUND P. SKOWRONSKI