Effect of Applied Pressure and Sintering Aid on Phase Separation and Crystallization Behavior of Amorphous Si3N4-BN Composite Powder.

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  • Kugimoto Hironori
    Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University
  • Uehara Masato
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • Enomoto Naoya
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • Hojo Junichi
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University

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Other Title
  • Ｓｉ３Ｎ４‐ＢＮ非晶質複合粉体の相分離結晶化挙動に及ぼす加圧および焼結助剤の効果
  • Si3N4 BN ヒショウシツ フクゴウ フンタイ ノ ソウ ブンリ ケッショウカ キョドウ ニ オヨボス カアツ オヨビ ショウケツ ジョザイ ノ コウカ

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Si3N4-BN nanocomposites are formed via phase separation and crystallization of amorphous Si3N4-BN composite powder during sintering. Amorphous Si3N4-BN composite powders were prepared by a vapor phase reaction method. To clarify the effect of applied pressure and sintering aid on the phase separation and crystallization behavior, the composite powders were hot-pressed and pressurelessly sintered with and without Y2O3-Al2O3 sintering aid. Si3N4 crystallized into α-phase at 1600°C without sintering aid, and into β-phase at 1400°C with sintering aid. It was found that the crystallization of Si3N4 and BN was promoted by applied pressure and sintering aid. On the other hand, the phase separation of BN from Si3N4 occurred around 1400°C regardless of applied pressure and sintering aid.

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