Synthesis and Properties of Porous Single-Phase β′-SiAlON Ceramics

Authors

  • Jian-Feng Yang,

    Corresponding author
    1. Japan Science and Technology Corporation (JST) at Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8687, Japan
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      Member, American Ceramic Society.

  • Yoshihisa Beppu,

    1. Synergy Ceramics Laboratory, Fine Ceramics Research Association (FCRA), Nagoya 463-8687, Japan
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      Member, American Ceramic Society.

  • Guo-Jun Zhang,

    1. Synergy Ceramics Laboratory, Fine Ceramics Research Association (FCRA), Nagoya 463-8687, Japan
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      Member, American Ceramic Society.

  • Tatsuki Ohji,

    1. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8687, Japan
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      Member, American Ceramic Society.

  • Shuzo Kanzaki

    1. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8687, Japan
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      Member, American Ceramic Society.


  • R. W. Rice—contributing editor

  • This work was supported by AIST, METI, Japan, as part of the Synergy Ceramics Project. Part of the work has been supported by NEDO.

  • The authors are members of the Joint Research Consortium of Synergy Ceramics.

Author to whom correspondence should be addressed. Currently at Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2268-1 Anagahora, Simo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan.

Abstract

Single-phase β′-SiAlON (Si6−zAlzOzN8−z, z= 0–4.2) ceramics with porous structure have been prepared by pressureless sintering of powder mixtures of á-Si3N4, AlN, and Al2O3 of the SiAlON compositions. A solution of AlN and Al2O3 into Si3N4 resulted in the β′-SiAlON, and full densification was prohibited because no other sintering additives were used. Relative densities ranging from 50%–90% were adjusted with the z-value and sintering temperature. The results of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy analyses indicated that single-phase β′-SiAlON free from a grain boundary glassy phase could be obtained. Both grain and pore sizes increased with increasing z-value. Low z-value resulted in a relatively high flexural strength.

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