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Decoration of Ceramic Foams by Ceramic Nanowires via Catalyst-Assisted Pyrolysis of Preceramic Polymers

Authors

  • Manabu Fukushima,

    Corresponding author
    1. National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Japan
    • Università di Padova, Dipartimento di Ingegneria Meccanica, Padova, Italy
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    • Member, The American Ceramic Society.
  • Yu-ichi Yoshizawa,

    1. National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Japan
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    • Member, The American Ceramic Society.
  • Paolo Colombo

    1. Università di Padova, Dipartimento di Ingegneria Meccanica, Padova, Italy
    2. Department of Materials Science and Engineering, The Pennsylvania State University, Pennsylvania
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    • Member, The American Ceramic Society.

Author to whom correspondence should be addressed. e-mail: manabu-fukushima@aist.go.jp

Abstract

Silicon oxynitride ( Si 2 N 2 O ) nanowires (NWs) were grown in situ on the cell walls of silicon carbide and alumina foams by coating preceramic polymers containing a Co-based catalyst, followed by pyrolysis in nitrogen at temperatures ranging from 1250°C to 1450°C. The relationship between different processing factors (type of substrate and preceramic polymer, pyrolysis temperature) and the growth of NWs was examined. Varying processing factors were found to be effective for controlling the growth of NWs. The use of a preceramic polymer containing a high amount of carbon as well as silica impurities present in the SiC foams led to a larger amount of longer NWs, homogeneously covering the ceramic struts of the porous substrates. The overall morphology and growing mechanism of the NWs on ceramic foams were investigated.

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