Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-03-14
1986-08-12
Childs, Sadie L.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
427255, 4272554, 428366, 428375, 428388, D04H 158, B32B 900
Patent
active
046055886
ABSTRACT:
Oxide-based ceramic fibers are treated in a novel process to create a substantially uniform boron nitride barrier coating at their surface. The process includes the step of heating the fiber, preferably an aluminoborosilicate fiber like NEXTEL, for between about 5-90 minutes in a nitriding atmosphere of ammonia, hydrogen and nitrogen at a temperature of between about 2200.degree.-2600.degree. F. to diffuse boron from the fiber to the surface of the fiber where it reacts to form the boron nitride coating.
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Simpson Frederick H.
Verzemnieks Juris
Childs Sadie L.
Hammar John C.
The Boeing Company
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