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Effect of atmosphere on pyrolysis of Nicalon

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Abstract

The pyrolytic behaviour of Nicalon under a N2 atmosphere was investigated at temperatures from 1673 to 1973 K, and was compared with that under an Ar atmosphere. The pyrolytic rate was measured by thermogravimetry, and heat-treated Nicalon was examined by X-ray diffraction, scanning electron microscopy, Auger electron spectroscopy and tensile testing. The pyrolytic rate was smaller in N2 than in Ar. The nitrided case retarded the crystallization into β-SiC and retained its high strength. The effectiveness of the nitrided case disappeared on heating in Ar. The strength was related to the size of the β-SiC crystal in Nicalon.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, College of Engineering, University of Osaka Prefecture, Gakuen-cho, Sakai-shi, 593, Osaka-fu, Japan

    Toshio Shimoo & Kiyohito Okamura

  2. University of Osaka Prefecture, Gakuen-cho, Sakai-shi, 593, Osaka-fu, Japan

    Toshihide Hayatsu (Graduate Student)

Authors
  1. Toshio Shimoo
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  2. Kiyohito Okamura
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  3. Toshihide Hayatsu
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Shimoo, T., Okamura, K. & Hayatsu, T. Effect of atmosphere on pyrolysis of Nicalon. JOURNAL OF MATERIALS SCIENCE 31, 4407–4413 (1996). https://doi.org/10.1007/BF00356468

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