金属アルコキシドのゾル・ゲル法によるZrO<sub>2</sub>-SiO<sub>2</sub>系多孔質ガラスの作製とその耐アルカリ性

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  • Alkali Resistance of Porous Glasses in the System ZrO<sub>2</sub>-SiO<sub>2</sub> Prepared by the Sol-Gel Process from Metal Alkoxides
  • キンゾク アルコキシド ノ ゾル ゲルホウ ニ ヨル ZrO2 SiO2ケイ

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Porous glasses in the system ZrO2-SiO2 containing up to 50mol% ZrO2 were prepared by the sol-gel process from metal alkoxides and their alkali resistances were investigated. The gels were made by hydrolyzing and drying the solution of Zr-propoxide which was brought into reaction with pre-hydrolyzed Si-ethoxide and were converted into the porous glasses by heating at 500° to ca. 800°C. It was found that the glass-like skeleton was already made up in these temperature regions. The specific surface area was 200-400m2/g and an average pore diameter was about 20Å. Alkali resistance of the porous glasses was examined by measuring the weight loss in 2N NaOH solution at 90°C. The weight loss markedly decreased with increasing ZrO2 content, that is, the value after 200h corrosion were 80×10-3, 10×10-3 and 2.5×10-3mg/dm2 for 10ZrO2⋅90SiO2, 30ZrO2⋅70SiO2 and 50ZrO2⋅50SiO2 porous glasses, respectively. The weight of porous glasses in NaOH solution decreased linearly with time, indicating the corrosion of the porous glasses was the dissolution controlled. The activation energy for the corrosion was about 45kJ/mol, independent of the existence of ZrO2. Zr-enriched layear was observed to adhere loosely to the glass surface but did not seem to effectively inhibit the dissolution of glasses.

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  • 窯業協會誌

    窯業協會誌 93 (1076), 195-200, 1985

    公益社団法人 日本セラミックス協会

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