合成ジルコンとアルミナのin-situ reactionを利用したムライト-ジルコニア及びムライト-ジルコニア-アルミナ系複合焼結体の微構造変化と機械的特性 Microstructural Changes and Mechanical Properties of Mullite-ZrO<sub>2</sub> and Mullite-ZrO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Composites Prepared Using In-Situ Reaction between Synthetic Zircon

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Abstract

rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002287984/

Mullite-ZrO<sub>2</sub> and mullite-ZrO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> composite ceramics were prepared by in-situ reaction between alumina and synthetic zircon powders. The mechanical properties of these composites were investigated as a function of Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> weight ratio in the matrix. Three-point bending strength at room temperature and fracture toughness increased with increasing content of Al<sub>2</sub>O<sub>3</sub> over the entire range of the Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> ratio from 70/30 to 90/10. In particular, the mean bending strength was 650MPa in the vicinity of the composition ratio of 90/10. As judged by the crystalline phases and observation of the fine structure, a strengthening mechanism which acts significantly on the mechanical properties of the composite sintered bodies was indicated by the following: (1) grain size reduction of the mullite matrix by dispersion of the Al<sub>2</sub>O<sub>3</sub> phase, (2) nano-structure in which Al<sub>2</sub>O<sub>3</sub> and ZrO<sub>2</sub> particles were finely dispersed in the mullite grains and (3) dispersion-effect of the Al<sub>2</sub>O<sub>3</sub> and ZrO<sub>2</sub> crystalline phase with a larger thermal expansion coefficient than that of the matrix.

Journal

  • Journal of the Ceramic Society of Japan

    Journal of the Ceramic Society of Japan 101(1179), 1292-1296, 1993

    The Ceramic Society of Japan

Cited by:  2

Codes

  • NII Article ID (NAID)
    110002287984
  • NII NACSIS-CAT ID (NCID)
    AN10040326
  • Text Lang
    UNK
  • Article Type
    Journal Article
  • ISSN
    0914-5400
  • NDL Article ID
    3852135
  • NDL Source Classification
    PA45(無機化学・無機化学工業--セラミックス)
  • NDL Source Classification
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL Call No.
    Z17-249
  • Data Source
    CJPref  NDL  NII-ELS  IR  J-STAGE 
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