Patent ID: 6913821

Claim:
A method of protecting a carbon fiber or carbon-carbon (C—C) composite component against high temperature oxidation, said method comprising the steps of: applying a coating of fluidized borophosphate glass precursor over the component by immersing the component in a bath containing glass precursor components including 25-50 weight-% phosphoric acid, 1-10 weight-% manganese phosphate, 2-20 weight-% potassium hydroxide, 1-10 weight-% boron nitride, 0-30 weight-% boron carbide, and 20-60 weight-% waters; gradially heating the glass precursor-coated component to a temperature range at which the glass transition temperature of a glass formed from the glass precursor is thermally matched to the oxidation temperature range of the carbon in the component, thereby forming a glass-coated component; continuing to heat the glass-coated component to anneal the glass-coated component; and gradually cooling the glass-coated component, thereby enveloping said component in a solid glass coating which protects it against high temperatures oxidation.