Crack healing in silicon carbide

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Crack healing in silicon carbide was investigated by introducing cracks into specimens and subsequently heat-treating the specimens. It was observed that cracks were healed, dramatically increasing the strength, by being filled with amorphous silica produced by the oxidation of silicon carbide. It was shown that the residual stress produced by the thermal expansion mismatch between silica within cracks and surrounding silicon carbide played a major role in the increase of the strength. Our results imply that a simple oxidation heat treatment can improve the reliability of silicon carbide components.
Publisher
Wiley-Blackwell
Issue Date
2004
Language
English
Article Type
Article
Keywords

SI3N4/SIC COMPOSITE CERAMICS; BEHAVIOR; STRENGTH; NITRIDE

Citation

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.87, no.3, pp.490 - 492

ISSN
0002-7820
DOI
10.1111/j.1551-2916.2004.00490.x
URI
http://hdl.handle.net/10203/79940
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