[Updated on Apr. 18] Integration of CiNii Articles into CiNii Research

Synthesis of AlN by the Nitridation of the Floating Al Particles in N<sub>2</sub> Gas

  • HOTTA Noriyasu
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • KIMURA Isao
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • TSUKUNO Akihito
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • SAITO Natsukaze
    Department of Chemical Engineering, Faculty of Engineering, Niigata University
  • MATSUO Shigetomo
    Department of Chemical Engineering, Faculty of Engineering, Niigata University Maeta Concrete Works, Ltd.

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Other Title
  • 浮上Al粒子の窒化反応によるAlNの合成
  • フジョウ Al リュウシ ノ チッカ ハンノウ ニ ヨル AlN ノ ゴウセイ

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Abstract

The nitriding reaction of floating Al particles in N2 gas was studied at 1350°-1550°C. The hollow spherical and fibrous AlN's formed were examined by X-ray diffraction and scanning electron microscopy. The nitriding reaction of floating Al particles in N2 gas proceeded in the following four steps: (i) floating Al particles melted and became spherical by surface tension, (ii) up to 1350°C the nitriding reaction was controlled by the diffusion of nitrogen through the AlN surface layer, (iii) cracks propagated in the AlN layer at 1400°-1550°C. The nitriding reaction rapidly proceeded with the eruption of internally melted Al, (iv) the eruption of Al also caused the nitriding reaction between vaporized Al and N2 gas to form AlN, resulting in hollow spherical AlN and fibrous AlN. The synthesized AlN was white, indicative of high purity. Since the particle size of floating Al was determined by controlling the N2 gas velocity, the classification of Al particles was possible. The mean size and size distribution of hollow spherical AlN particles formed were controlled within the range 4 to 12μm. The hollow spherical AlN particles were so brittle that they were easily crushed to fine particles even by fingers. Thus obtained AlN particles were very fine and had narrow size distribution of 0.1-0.2μm.

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