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Strength Retention in SiC Ceramics after Long‐Term Oxidation
Author(s) -
Becher Paul F.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb10101.x
Subject(s) - cristobalite , flexural strength , materials science , ceramic , impurity , oxide , composite material , mineralogy , metallurgy , chemistry , quartz , organic chemistry
The room‐temperature flexural strengths of Sic ceramics change with increasing oxidation time at 1200°C. When certain impurities (e.g. alumina, WC, and possibly others) are present, the strength continuously decreases ∼50% after 4500 h because of subsurface pit formation. Materials containing B and C or Si exhibit strength increases (≥240% after 4500 h). Surface oxide growth rates substantially decrease at times ≥1850 h, which corresponds to an increase in cristobalite formution.