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Corrosion of CVD Silicon Carbide in 500°C Supercritical Water

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A high-purity CVD -SiC showed a relatively low corrosion rate in deoxygenated supercritical water at 500°C. The corrosion rate was lower than that previously reported for CVD SiC in 360°C water and much lower than that reported for sintered and reaction-bonded SiC. The present study confirmed that CVD SiC was preferentially attacked at the grain boundaries. Analytical examinations did not reveal the presence of a measurable oxide scale. As a result, it is believed that corrosion of the high-purity SiC occurred via hydrolysis to hydrated silica species at the surface that were rapidly dissolved into the supercritical water.
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Document Type: Research Article

Affiliations: 1: Ceramic Tubular Products, Rockville, Maryland 20855 2: Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706 3: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Publication date: 2007-01-01

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