高速遠心成形法による高純度アルミナ焼結体の機械的特性の組織依存性 Dependence of Mechanical Properties on Sintered Microstructure of High Purity Alumina Made by High-speed Centrifugal Compaction Process

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Influence of microstructures on mechanical properties of high performance alumina is investigated focusing on density and mean grain size as microstructure characteristics. An alumina powder with a purity of 99.99 % and mean grain size of 0.22μm is dispersed in 25 mass % of ion-exchanged water, compacted applying a centrifugal force of 10, 000-20, 000 g for 3 ks, and sintered at 1423-1773 K for 0-172.8 ks in air.<BR>It is shown that strength and hardness have one peak value respectively as microstructure develops during sintering, and those peaks appear on the same specimen with a relative density of about 99 % and grain size of about 1μm. For the specimens with density lower than 99 %, the strength and hardness decrease as density decrease, whereas for the ones with density higher than 99 %, those values decrease as grain size increase.<BR>Furthermore, two empirical equations, which show the dependence of bending strength and hardness on both porosity and grain size, are derived by multivariate analysis. These equations provide contour lines which represent microstructures having the same strength or hardness on the grain-size/relative-density diagram. Superposing a trajectory line derived from grain size and density of various specimens on the diagram, the point where this trajectory and one of contour lines contact represents the best couple of grain size and relative density for the mechanical properties.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 46(4), 331-338, 1999-04-15 

    Japan Society of Powder and Powder Metallurgy

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被引用文献:  3件

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各種コード

  • NII論文ID(NAID)
    10002262180
  • 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
    4701438
  • 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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