アルミナ‐ｗ‐ＢＮ混合物を原料とする超高圧焼結体の破壊じん性

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タイトル別名
  • Fracture Toughness of High Pressure-Sintered Compacts Obtained from Mixture of Alumina and Wurtzite-Type Boron Nitride
  • アルミナ -w BN コンゴウブツ オ ゲンリョウ ト スル チョウコウアツ

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抄録

Wurtzite-type boron nitride (w-BN) was dispersed in alumina matrix and sintered under 6 GPa and 1300°C for 60min. Density, hardness and fracture toughness were measured, and X-ray diffraction analysis and SEM observation were also conducted. Content of w-BN was 5-15vol%. Sintered compacts were heated at 10-3 Torr and 1300°C for 6hours, and boron nitride was transformed into graphite like structure (g-BN). Volume expansion was accompanied by the transformation. Fracture toughness of the heat-treated composites decreased. This was compared with the results of diamond-dispersed alumina ceramics. It is supposed that spontaneous microcracks propagated in the matrix, because the transformation temperature from w-BN into g-BN (600°-700°C) was too low for matrix alumina to relax the initiated stress due to the volume expansion. On the contrary, for diamond-alumina ceramics heat-treated in order to transform diamond into graphite, transformation temperature (1300°C) was high enough for stress relaxation of the matrix.

収録刊行物

  • 窯業協會誌

    窯業協會誌 92 (1068), 466-469, 1984

    公益社団法人 日本セラミックス協会

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