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High temperature exposure of low-oxygen SiC fibers (Hi-Nicalon) in CO-CO2 gas mixtures

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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 \(p_{CO_2 } \) ≧ 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 \(p_{CO_2 } \) ≦ 5 × 102 Pa. 65–90% of the strength in the as-received state was retained after the active-oxidation at \(p_{CO_2 } \) ≦ 102 Pa and after the passive-oxidation at \(p_{CO_2 } \) ≧ 5 × 104 Pa. Surface imperfections produced very large decrease in tensile strength in the CO2 partial pressure range of 5×102 to 104 Pa.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, 599-8531, Osaka, Japan

    T. Shimoo & K. Okamura

  2. Osaka Gas Co., Ltd., 4-1-2, Hirano-machi, Chuo-ku, 541-0046, Osaka, Japan

    T. Morita

Authors
  1. T. Shimoo
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  2. K. Okamura
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  3. T. Morita
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Shimoo, T., Okamura, K. & Morita, T. High temperature exposure of low-oxygen SiC fibers (Hi-Nicalon) in CO-CO2 gas mixtures. Journal of Materials Science 39, 7031–7039 (2004). https://doi.org/10.1023/B:JMSC.0000047548.81028.e1

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  • DOI: https://doi.org/10.1023/B:JMSC.0000047548.81028.e1

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