リシア雲母組成ガラスの結晶化に及ぼすジルコニアの影響

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  • Effects of Zirconia on Crystallization of Glasses with Lepidolite Composition
  • リシア ウンモ ソセイ ガラス ノ ケッショウカ ニ オヨボス ジルコニア ノ

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The effect of zirconia on crystallization of glasses with lepidolite composition and properties of glass-ceramics obtained have been investigated. The batches of 7LiF⋅15KF⋅28Al2O3⋅50SiO2 (wt%) were melted at 1500°C for 10min and the melts were quenched by pressing the melt with platinum plate. The obtained glasses were heated at a constant heating rate, and the precipitated crystals were found to be lepidolite and β-eucryptite by X-ray diffraction analysis. The crystallization temperatures of lepidolite and β-eucryptite were 600 and 800°C, respectively at the heating rate of 10°C⋅min-1. However, in order to precipitate the lepidolite in the glass containing no ZrO2 by isothermal heat-treatment, the crystallization of lepidolite required heating the glass at 500°C for more than 1h. One percent ZrO2 was sufficient for the crystallization of lepidolite. The activation energy for crystal growth of the glass was 268kJ/mol. The thermal conductivity of glass-ceramics heated at 500°C for 1h and then 800°C for 2h was 0.033W/cm⋅°C, which was larger than lepidolite glass-ceramics, and its thermal expansion coefficient and dielectric properties were similar to those of lepidolite glass-ceramics.

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