Very High Pressure Sintering of High Dense Form Boron Nitride using Wurtzite Type as Starting Materials

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Other Title
  • ウルツ鉱型窒化ホウ素を出発物質とした高密度型窒化ホウ素の超高圧力焼結体
  • ウルツコウガタ チッカ ホウソ オ シュッパツ ブッシツ ト シタ コウ ミツ
  • ウルツ鉱型窒化ほう素を出発物質とした高密度型窒化ほう素の超高圧力焼結体

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Description

Shock synthesized wurtzite type boron nitride (w-BN) powders with particle size of 0.1∼0.5 μm were treated in the temperature range between 1150°C and 1900°C at 6.7 GPa. The purpose of this study is to clarify the sintering process and the relation between microstructure and mechanical properties. A link type of cubic anvil very high pressure apparatus was used for very high pressure sintering. w-BN transformed to zinc blende phase (z-BN) above 1300°C. The apparent density and vicker's micro hardness of sintered compacts increased with increasing temperature of treatment up to 1600°C for 15 min. Any grain growth was not observed in the sintered compact treated below 1600°C.<BR>The compact, obtaind at 6.7 GPa and 1600°C for 15 m in, consisted of 10 w t% w-BN and 90 wt% z-BN and had theoretical density and extremely high hardness above 8000 kg/mm2. Hardness and density decre ased with increasing temperature above 1600°C and grain growth was arisen. Plate-like grains whose plane corresponded to (111) of z-BN was observed in the compact obtained at 1900°C. It is seemed that a prefered orientation of w-BN powder to (002) relates to anisopropic grain growth of z-BN.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1981 (9), 1416-1421, 1981-09-10

    The Chemical Society of Japan

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