Synthesis of Crystalline Mullite Fine Powders at Low Temperature by Hydrothermal Treatment of Mixed Alkoxide

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  • SUZUKI Matsuo
    esearch Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology
  • HIRAISHI Shun-ichi
    大日本インキ化学工業株式会社
  • YOSHIMURA Masahiro
    esearch Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology
  • SOMIYA Shigeyuki
    esearch Laboratory of Engineering Materials and Department of Materials Science, Tokyo Institute of Technology

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  • 混合アルコキシドの水熱処理による結晶性ムライト微粉体の低温合成
  • コンゴウ アルコキシド ノ スイネツ ショリ ニ ヨル ケッショウセイ ムライ

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Abstract

Hydrothermal conditions for the synthesis of mullite powders from mixed alkoxide containing Al2O2:SiO2=3: 2(mole ratio) were investigated at 300-600°C under 10-100 MPa for 2-168 h. Above 20 MPa, fine crystalline mullite powders were obtained at 600°C within 2 h. To produce homogeneous mullite powders, the hydrothermal treatments below 30 MPa at 600°C were preferable, because hydralsite(2Al2O2:SiO2·H2) and AS(H)-11 (5 Al2O2·2SiO2 n H2) were produced prior to mullite above 30 MPa at 600°C. In the produce prepared at 600°C under 20 MPa for 2 h, accicular particles of 100 nm in length and 20 nm in width were observed under the transmission electron microscope(TEM). The particles grew up to more than 1, um in length and 20 nm in width at 600°C under 20 MPa for 168 h. The energy dispersive spectrometry(EDS) proved that the prepared particles had the constant Al2O2/SiO2mole ratio(=3/2). The synthesized particles was revealed to be mullite by IR absoption method.

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