Patent ID: 7118805

Claim:
A coated article comprising a component made of carbon fiber or carbon-carbon composite annealed at a temperature in the range of 1600–2600° C. (2912–4712° F.), said component being covered by a phosphorus-containing undercoating comprising ions formed from 10–80 wt % H 2 0, 20–70 wt % H 3 PO 4 , 0.1–25 wt % alkali metal mono-, di-, or tri-basic phosphate, 0–2 wt % B 2 O 3 , and 0–25 wt % MnHPO 4 .1.6H 2 O, 0–30 wt % AlPO 4 , and 0–10 wt % Zn 3 (PO 4 ) 2 , provided that at least one of AlPO 4 , MnHPO 4 .1.6H 2 O, and Zn 3 (PO 4 ) 2 is present, said undercoating having a thickness of approximately 1–10 mil, said undercoating being covered by a boron-containing glass overcoating comprising boron nitride and also at least one of boron carbide and elemental boron, said undercoating having a thickness of approximately 1–10 mil, wherein said coated article is protected against catalytic oxidation when the article is subjected to temperatures of 800° C. (1472° F.) or greater.