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Oxidation Behavior of Si–Nb–C–O Ceramics Prepared by the Pyrolysis of Methyltriethoxysilane Based Organic-Inorganic Hybrid Gel

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Abstract

The oxidative structural characterization of Si–Nb–C–O ceramic prepared by the heat-treatment of transition metal containing polymethylsilsesquioxane hybrid was investigated. The heating temperature for the pyrolysis of precursor hybrid gels strongly affected the oxidation behavior of the resultant ceramics. The hybrid gel pyrolyzed at 600∘C was rapidly oxidized, while the hybrid gel pyrolyzed at 1000∘C showed the higher resistance to oxidation. In the hybrid pyrolyzed at 600∘C, new Si–O–Nb oxygen-bridged heterometal bonds were formed after oxidation, which was confirmed by FT-IR spectra. On the other hand, silica and oxycarbide protective layer was formed on the oxidized surface of the hybrid heated at 1000∘C, as suggested by X-ray photoelectron spectroscopy (XPS). Raman spectra showed a large luminescence background, G and D bands before oxidation. After oxidation, however, the luminescence background disappeared and G band was more symmetric than that of non-oxidative product. This strongly suggested the predominant oxidation of radical and related unstable carbon species in the ceramics.

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Authors and Affiliations

  1. Materials & Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Manabu Fukushima & Eiichi Yasuda

  2. Chemical Resources Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Yoshiyuki Nakamura

  3. Materials & Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Masao Shimizu & Yoshikazu Teranishi

  4. Department of Materials Science, Sardar Patel University, Vallabh Vidyanagar, 388120, Gujarat, India

    L. M. Manocha

  5. Materials & Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Yasuhiro Tanabe

Authors
  1. Manabu Fukushima
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  2. Eiichi Yasuda
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  3. Yoshiyuki Nakamura
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  4. Masao Shimizu
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  5. Yoshikazu Teranishi
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  6. L. M. Manocha
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  7. Yasuhiro Tanabe
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Correspondence to Manabu Fukushima.

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Fukushima, M., Yasuda, E., Nakamura, Y. et al. Oxidation Behavior of Si–Nb–C–O Ceramics Prepared by the Pyrolysis of Methyltriethoxysilane Based Organic-Inorganic Hybrid Gel. J Sol-Gel Sci Technol 34, 15–21 (2005). https://doi.org/10.1007/s10971-005-1258-8

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  • DOI: https://doi.org/10.1007/s10971-005-1258-8

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