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Active-to-passive oxidation transition for polycarbosilane-derived silicon carbide fibers heated in Ar-O2 gas mixtures

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Abstract

The active-to-passive oxidation transition for three types of polycarbosilane-derived SiC fibers (Nicalon, Hi-Nicalon and Hi-Nicalon S) was examined at 1773 K through TG, XRD analysis, SEM observation and tensile tests. The oxygen partial pressure for the active-to-passive oxidation transition decreased in the following order: p O 2 = 100–250 Pa for Nicalon, p O 2 = 10–25 Pa for Hi-Nicalon and p O 2 = 1–2.5 Pa for Hi-Nicalon S. Considerable strength was retained in the passive-oxidation region. The active-oxidation produced a marked decrease in strength of Nicalon and Hi-Nicalon (σ \(\fallingdotseq\) 0 GPa). On the other hand, the strength of Hi-Nicalon S after active-oxidation was nearly identical to that after passive-oxidation (σ \(\fallingdotseq\) 1 GPa).

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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 Prefecture University, 1-1, Gakuen-cho, 599-8531, Sakai, Osaka, Japan

    Y. Morisada

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  1. T. Shimoo
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  2. K. Okamura
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  3. Y. Morisada
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Shimoo, T., Okamura, K. & Morisada, Y. Active-to-passive oxidation transition for polycarbosilane-derived silicon carbide fibers heated in Ar-O2 gas mixtures. Journal of Materials Science 37, 1793–1800 (2002). https://doi.org/10.1023/A:1014945823031

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