Patent ID: 7160618
Filing Date: 2007-01-09
Classification: C03C,C04B,F16D,Y10T

Abstract:
1. A coated article comprising a carbon-carbon composite component, a graphite component, or a ceramic matrix composite component based on carbon fibers and/or graphite, said component being covered by a phosphorus-containing antioxidant undercoating having a thickness of approximately 1–10 mil, said undercoating being covered by a boron-containing glass overcoating having a thickness of approximately 1–10 mil, said overcoating comprising 20–50 wt-% alkali or alkaline earth metal silicate, 3–25 wt-% alkali metal hydroxide, up to 10 wt-% boron nitride, and one or both of 5–40 wt-% elemental boron and 5–40 wt-% boron carbide, said boron-containing glass overcoating being substantially free of phosphoric acid and phosphates.