학술논문
Corrosion of CVD Silicon Carbide in 500°C Supercritical Water.
Document Type
Article
Author
Source
Subject
*SILICON carbide
*SINTERING
*SUPERCRITICAL fluids
*ELECTROLYTIC corrosion
*CRYSTAL grain boundaries
*SILICA
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*
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Language
ISSN
0002-7820
Abstract
A high-purity CVD β-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. [ABSTRACT FROM AUTHOR]