Influence of Addition of AlF3 on Thermal Decomposition of Gibbsite and Phase Transition of the Intermediate Alumina to .ALPHA.-Al2O3

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  • SHIMBO Mitsuo
    Center for Geo-Environmental Science, Faculty of Engineering and Resource Science, Akita University
  • YAMAMOTO Osamu
    Center for Geo-Environmental Science, Faculty of Engineering and Resource Science, Akita University
  • HAYASHI Shigeo
    Center for Geo-Environmental Science, Faculty of Engineering and Resource Science, Akita University
  • NAKAGAWA Zenbe-e
    Center for Geo-Environmental Science, Faculty of Engineering and Resource Science, Akita University

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  • Influence of addition of AlF3 on thermal decomposition of gibbsite and phase transition of the intermediate alumina to α-Al2O3
  • Influence of addition of AlF3 on thermal decomposition of gibbsite and phase transition of the intermediate alumina to a Al2O3

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The addition of aluminum fluoride to gibbsite retarded the phase change to boehmite by chemisorption of hydrogen fluoride on gibbsite particles. In the specimen with addition of aluminum fluoride, the spinel type phase transformed directly to α-Al2O3, without passing through κ- and θ-Al2O3 phases. The formed α-Al2O3 consisted of clear, hexagonal plate-like particles about 1 μm, Without taking over a relic of the gibbsite particle. The formation of automorphic crystals suggests that a surface diffusion also contributes to the mechanism of this material transport in addition to the vapor phase transport.<br>

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