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Microstructural development of Si3N4–SiC–Y2O3 ceramics derived from polymeric precursors

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Abstract

[Si–Y–O–C–N] amorphous powders were synthesized by the pyrolysis at 1000 °C in N2 of chemically modified perhydropolysilazane using n-decyl alcohol and yttrium tri-methoxide. [Si–Y–O–C–N] amorphous powders yielded a unique fibrous microstructure by heat treatment in N2 at 1800 °C. The fibrous microstructure was composed of β–Si3N4 whiskers of submicron in diameter and more than 10 μm in length. Fully dense Si3N4 –SiC–Y2O3 ceramics were also fabricated by heat treatment at 1800 °C followed by powder-vehicle hot pressing at 1700 °C. After these two-step processings, [Si–Y–O–C–N] amorphous powders yielded a unique fine-grained microstructure composed of submicron grains with high aspect ratio.

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Authors and Affiliations

  1. Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2-4-1, Mutsuno Atsuta-ku, Nagoya, 456, Japan

    Yuji Iwamoto

  2. National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya, 462, Japan

    Ko-ichi Kikuta

  3. Department of Applied Chemistry, School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

    Shin-ichi Hirano

Authors
  1. Yuji Iwamoto
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  2. Ko-ichi Kikuta
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  3. Shin-ichi Hirano
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Iwamoto, Y., Kikuta, Ki. & Hirano, Si. Microstructural development of Si3N4–SiC–Y2O3 ceramics derived from polymeric precursors. Journal of Materials Research 13, 353–361 (1998). https://doi.org/10.1557/JMR.1998.0047

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  • DOI: https://doi.org/10.1557/JMR.1998.0047

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