Formability and Sinterability of Hydrothermally Crystallized Monodispersed Titanium Dioxide Particles

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  • KONDO Masao
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • FUNAKUBO Hiroshi
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • SHINOZAKI Kazuo
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • MIZUTANI Nobuyasu
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology

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  • 水熱法により結晶化した単分散酸化チタン微粒子の成形性及び焼結性
  • スイネツホウ ニ ヨリ ケッショウカシタ タンブンサン サンカ チタン ビリュ

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Abstract

New forming process of nano-sized particles without a binder was proposed. Compacts of spherical amorphous agglomerated monodispersed titanium dioxide particles (-0.7μm) synthesized by the alkoxide method were hydrothermally treated in an autoclave to crystallize the primary particles (-13nm) to anatase single crystal. The hydrothermally treated compacts were compressed by cold isostatic press (CIP) and the hydrothermally treated particles were crushed to many nano-sized anatase particles to form again dense green bodies (61%) without a binder by CIP. The high formability of nano-sized anatase particles is considered to result in the agglomerated structure of hydrothermally treated particles. Green compacts obtained by this process showed high sinterability. Dense rutile bodies (99% of the theoretical density) were obtained by sintering at 900°C for 24h.

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