Solidification of Glass Powder by A Hydrothermal Hot-Pressing Technique

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  • NISHIOKA Mamoru
    Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University
  • YANAGISAWA Kazumichi
    Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University
  • YAMASAKI Nakamichi
    Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University

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  • 水熱ホットプレス法によるガラス粉末の固化
  • スイネツ ホットプレスホウ ニ ヨル ガラス フンマツ ノ コカ エイブン

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A borosilicate glass powder was solidified with a NaOH solution or distilled water by the hydrothermal hot-pressing technique. The effect of hydrothermal conditions on the compressive strength was investigated, and the densification mechanism of the glass powder during the hydrothermal hot-pressing was discussed in terms of isothermal shrinkage. The glass powder was successfully solidified by hydrothermal hot-pressing at a reaction temperature lower than that of an ordinary pressure sintering. The solidified body obtained in the presence of distilled water (10wt%) at 280° had a high compressive strength of about 2300kg/cm2. The analysis of initial densification process of the glass powder in hydrothermal hot-pressing with Murray's rate equation revealed that the densification proceeds both by viscous flow and by rearrangement process. Analysis of the shrinkage rates with a rate equation of hydrothermal reaction suggested that the dissolution of particles into solution controlled the initial densification of the glass powder, and that the alkaline metal acted as a catalyst.

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