Abstract
Application of silicon-based ceramics (SiC, Si 3 N 4 ) and SiC/SiC composites as high-temperature structural materials requires the development of environmentally resistant coatings due to rapid degradation of the protective silica scale in high temperature water vapor. The CVD method of fabricating dense, high-purity, crystalline mullite (3Al 2 O 3 x2SiO 2 ) and mullite-alumina coatings was utilized in this study. The textured mullite coatings were generally comprised of crystalline grains (0.3-0.5 μm) with a columnar structure. Coatings with thickness of less than 2 μm, provided excellent corrosion protection for Si 3 N 4 and SiC/SiC exposed to low-velocity, high pressure (1 MPa) steam at 1200°C.
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