二硼化ジルコニウムのホットプレス焼結クロムおよびニッケル添加の影響

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書誌事項

タイトル別名
  • Hot-Pressing of Zirconium Diboride with Binder Metals
  • ニホウカ ジルコニウム ノ ホットプレス ショウケツ クロム オヨビ ニッケル テンカ ノ エイキョウ

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説明

ZrB2 was hot-pressed at the temperature range from 1450° to 1970°C with or without additions of 6% of metallic binders- Cr or Ni. Densification rates at constant pressure of 200kg/cm2 were measured continuously for about 30 min at each test temperature.<br>For the hot-pressing below the melting temperature of metallicbin der, these data were treated reasonably with following equation which were proposed by Murray et al. for the plastic flow model of hot-pressing ceramics.<br>dD/dt=(3P/4η)(1-D) and integrating, <br>ln(1-D)=-(3P/4η)t+ln (1-D0).<br>Viscosity, η, was calculated at various temperatures for ZrB2 compacts. Activation energy was about 85kcal/mol.<br>In case when ZrB2-metal mixtures were hot-pressed above melting temperatures of metals, porous surface layers were observed with deficiency in metallic binder and with deviation of densification data from Murray's epuation.

収録刊行物

  • 窯業協會誌

    窯業協會誌 75 (859), 84-90, 1967

    公益社団法人 日本セラミックス協会

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