Abstract: This invention relates to a method of inhibiting catalyzed oxidation of carbon-carbon composites involving the steps of treating a carbon-carbon composite having pores with a liquid composition, preferably an aqueous solution, containing (a) phosphoric acid, (b) a zinc salt, and (c) an aluminum salt and heating the treated carbon-carbon composite to a temperature sufficient to form deposits within the pores. In one aspect, the deposit comprises a dispersion of aluminum-rich phosphate in zinc-rich phosphate. This solution may be used in combination with a silicon carbide barrier coating, applied by either painting or by CVD, to allow application at higher temperatures. The adherence of the barrier coating may be improved by preoxidizing the surface to increase porosity at the surface. Articles, including friction brakes, and the aqueous compositions are also part of this invention. The methods and articles show improved penetration and retention of the catalyzed oxidation inhibitors.

Abstract: This invention relates to a composition and method of inhibiting catalyzed oxidation of carbon-carbon composites. The invention includes compositions, capable of impregnating carbon-carbon composites. The invention also includes a method of inhibiting catalyzed oxidation of carbon-carbon composites comprising the steps of treating a carbon-carbon composite with the catalyzed oxidation inhibiting aqueous mixture, and heating the treated carbon-carbon composite to a temperature sufficient to remove water. Articles, including friction brakes, made by this method are also part of this invention. Brake lugs, and other exposed areas of aircraft braking systems have improved resistance to catalyzed oxidation.