초록 ▼

Coated article, e.g., a brake disc, comprising a carbon-carbon composite component or a carbon-carbon-silicon carbide component coated at least with a phosphorus-containing antioxidant undercoating, the undercoating being covered by a silicon carbide particle-containing overcoating of alkali or alka

Coated article, e.g., a brake disc, comprising a carbon-carbon composite component or a carbon-carbon-silicon carbide component coated at least with a phosphorus-containing antioxidant undercoating, the undercoating being covered by a silicon carbide particle-containing overcoating of alkali or alkaline earth metal silicate, pH modifier, and silicon carbide particles. Also, method of protecting a carbon-carbon composite brake disc or a carbon-carbon-silicon carbide composite brake disc against oxidation, by: coating the composite brake disc with a first phosphoric acid-based penetrant system; curing the penetrant coating at a temperature of 200�� C. or above to form a first coating on the composite brake disc; applying the ceramic coating composition of claim 1 over the first coating and curing the ceramic coating at a temperature below 200�� C. to form a second coating on the composite brake disc; and optionally coating the coated composite brake disc so obtained with a second phosphoric acid-based penetrant system; and curing the penetrant coating at a temperature of 200�� C. or above to form a third coating on the composite brake disc.

대표청구항 ▼

What is claimed is: 1. A coated article comprising a carbon-carbon composite component having a density in the range of from about 1.6 g/cm3 through 2.0 g/cm3, said carbon-carbon composite component configured as an aircraft landing system brake disc and being covered by a phosphorus-containing ant

What is claimed is: 1. A coated article comprising a carbon-carbon composite component having a density in the range of from about 1.6 g/cm3 through 2.0 g/cm3, said carbon-carbon composite component configured as an aircraft landing system brake disc and being covered by a phosphorus-containing antioxidant undercoating having a thickness of approximately 1-10 mil annealed to said carbon-carbon composite component at a temperature in the range of 250-900�� C., said undercoating being covered by a silicon carbide particle-containing overcoating having a thickness of approximately 1-10 mil dried onto said undercoating at ambient temperature for at least one hour, said overcoating being made from 60-80 wt-% water-miscible silicate-based binder solution, up to 20 wt-% alkali metal hydroxide, and 10-30 wt-% silicon carbide, wherein the silicon carbide component of said silicon carbide particle-containing overcoating consists of silicon carbide particles having particle sizes ranging from 0.05 to 0.5 microns. 2. The coated article of claim 1, wherein the silicon carbide particles have a particle size of 325 mesh. 3. The coated article of claim 1, wherein said silicon carbide particle-containing overcoating comprises 65-75 wt-% alkali metal silicate, 5-15 wt-% alkali metal hydroxide, and 15-25 wt-% silicon carbide particles. 4. The coated article of claim 1, wherein said silicon carbide particle-containing overcoating comprises, on a solids basis, about 70 wt-% alkali metal silicate, about 10 wt-% alkali metal hydroxide, and about 20 wt-% silicon carbide particles having an average particle size of 0.1-0.2 microns. 5. The coated article of claim 1, wherein said phosphorus-containing antioxidant undercoating is formed from a penetrant salt solution containing from 5-80 wt % H2O, 10-70 wt % H3PO4, up to 25 wt % alkali metal mono-, di-, or tri-basic phosphate, up to 2 wt % B2O3, and at least one of MnHPO4. 1.6H2O, AlPO4, and Zn3(PO4)2, in weight-percentages up to 25 wt-%, 30 wt-%, and 10 wt-%, respectively.