Design of Counter-Current Moving Bed Reactor for CVD Coating of Ultra-Fine Particles.

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  • Shinohara Kunio
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Golman Boris
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Watanabe Kazuhiro
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Chiba Shigeo
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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  • Design of Counter-Current Moving Bed Re

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A new counter-current type of moving bed reactor was devised for AIN coatings of Si3N4 fine particles in the form of agglomerates by chemical vapor deposition. The influence of process parameters, such as reaction time and temperature, input concentration of gas precursor, and the agglomerate size, was investigated in relation to total quantity of deposited AIN inside the agglomerates. A simplified reactor model was used to analyze the deposition data. As a result, the conversion of Si3N4 particles to their composite with AIN increased with increasing temperature and concentration of AICl3 reaction gas and with decreasing agglomerate size. Thus, it has become possible to produce a sort of surface modified ultra-fine particle at certain coating ratios continuously.

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