急速凝固粉末を用いたジルコニア含有ムライトセラミックス焼結体の高温変形 High Temperature Deformation of Mullite-Zirconia Ceramics Hot-Pressed from Rapidly Solidified Powder

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Three kinds of mullite, termed CP, HK and HP mullite (in order of increasing purity) containing 30 mass% zirconia were rapidly solidified to obtain amorphous ceramic powder. The rapidly solidified (RS) amorphous powder was hot-pressed exhibiting a very fine microstructure. High temperature deformation behaviour was assessed using 3 point bending and tensile tests. It was found that (1) The RS specimens exhibited greater ductility than the non RS specimens in the bending test at elevated temperature. (2) The bending force at elevated temperature was dependant on the bending rate. A bending rate sensitivity index (m') of approximately 0.5 was derived from a bending rate (ν) of 10<SUP>-3</SUP> mm s<SUP>-1</SUP> for both HK-RS and HK-non RS materials. The bending force for the RS material was lower than that of the non RS material. (3) The tensile stress at elevated temperature was dependant on strain rate. The strain rate sensitivity index (m) was approximately 0.5 at an initial strain rate (ε) of 2.5×10<SUP>-4</SUP> s<SUP>-1</SUP> for both HK-RS and non RS materials. The flow stress for the RS material was lower than that of the non RS material. A fracture strain of 80% was achieved at the same strain rate for RS material. (4) The ductility exhibited by the RS materials increased at elevated temperature. This was attributed to the ultrafine microstructure which was thought likely to encourage superplastic behaviour.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 45(2), 182-188, 1998-02-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015110
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4413746
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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