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- Title
High temperature exposure of low-oxygen SiC fibers (Hi-Nicalon) in CO-CO<sub>2</sub> gas mixtures.
- Authors
Shimoo, T.; Okamura, K.; Morita, T.
- Abstract
The oxidation behavior and thermal stability of Si-C fibers (Hi-Nicalon) in CO-CO2 gas mixtures were investigated at 1773 K, through mass change determination, XRD analysis, resistivity measurement, SEM observation and tensile test. Mass gain and cristobalite formation were observed at pCO2 ≧ 2 × 103 Pa, showing the occurrence of passive-oxidation of the fibers. The active-oxidation, which was characterized by the mass loss, involved the formation of carbon film at pCO2 ≦ 5 × 102 Pa. 65–90% of the strength in the as-received state was retained after the active-oxidation at pCO2 ≦ 102 Pa and after the passive-oxidation at pCO2 ≧ 5 × 104 Pa. Surface imperfections produced very large decrease in tensile strength in the CO2 partial pressure range of 5×102 to 104 Pa.
- Subjects
OXIDATION; FIBERS; CRISTOBALITE; SILICATE minerals; SILICON carbide; CERAMICS
- Publication
Journal of Materials Science, 2004, Vol 39, Issue 23, p7031
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/B:JMSC.0000047548.81028.e1