ZrO_2-Al_2O_3系におけるZrO_2固溶体粉体の合成とHIP焼結 Preparation and Hot Isostatic Pressing of ZrO_2 Solid Solution Powders in the System ZrO_2-Al_2O_3

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Special attention has been given to partially stabilized ZrO<SUB>2</SUB> (PSZ), tetragonal ZrO<SUB>2</SUB> polycrystal (TZP), and ZrO<SUB>2</SUB>-toughened Al<SUB>2</SUB>O<SUB>3</SUB> (ZTA) to improve the fracture toughness (K<SUB>IC</SUB>) and bending strength (σ<SUB>b</SUB>) of ceramics. In a recent study, it was shown that in the system ZrO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>, ZrO<SUB>2</SUB> solid solutions (ss) are formed metastably up to ≈40 mol% Al<SUB>2</SUB>O<SUB>3</SUB> from amorphous materials prepared by the alkoxy-method. Isostatically hot-pressed ZrO<SUB>2</SUB>(ss) ceramics exhibit very high K<SUB>IC</SUB> (23 MPa⋅m<SUB>1/2</SUB>) and plastic deformation at room temperature, although their σ<SUB>b</SUB> is weak (≤700 MPa). The texture consists of a homogeneous microstructure with a grain size of ≈50nm. To improve ab, two kinds of ceramics have been fabricated by the addition of a small amount of Y<SUB>2</SUB>O<SUB>3</SUB>: (1) perfect ZrO<SUB>2</SUB>(ss) ceramics and (2) composite ceramics of ZrO<SUB>2</SUB>(ss) and a-Al<SUB>2</SUB>O<SUB>3</SUB>. Composites with a homogeneous dispersed cc-Al<SUB>2</SUB>O<SUB>3</SUB> result in a remarkable increase of σ<SUB>b</SUB> (1445 MPa). The ratio of ZrO<SUB>2</SUB>(ss) and α-Al<SUB>2</SUB>O<SUB>3</SUB> can be controlled by the amount of Y<SUB>2</SUB>O<SUB>3</SUB> addition and sintering temperature. A new method for preparing solid solutions from chlorides using hydrazine monohydrate has been developed in some systems. This paper describes the mechanical properties of PSZ, TZP and ZTA ceramics fabricated using ZrO<SUB>2</SUB>(ss) powders prepared by some sol-gel techniques.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 43(7), 899-906, 1996-07-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012639
  • 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
    4004691
  • 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
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    CJP書誌  CJP引用  NDL  J-STAGE 
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