Effect of Alkali Metal Oxide Addition on Crystallization and Phase Transformation of Sintered Spherical Silica

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  • HIGUCHI Masashi
    Department of Industrial Chemistry, Faculty of Engineering, Tokai University
  • AZUMA Yasuo
    Department of Industrial Chemistry, Faculty of Engineering, Tokai University

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  • 非晶質シリカの焼結に伴う結晶化と相転移におけるアルカリ金属酸化物の影響
  • ヒショウシツ シリカ ノ ショウケツ ニ トモナウ ケッショウカ ト ソウ テ

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A compact of spherical silica with alkali metal oxide addition was fired within a temperature range from 600 to 1200°C for 6h in air. The crystallization and phase transformation behavior of sintered spherical silica were examined by XRD, IR, DTA, density and shrinkage measurements and SEM. The following results were obtained. (1) The silica phases formed in the sintered compacts depended on the kind and amount of added alkali metal oxide and on the firing temperature. (2) The phase transformation behavior of sintered spherical silica proceeded as follows: amorphous silica→keatite→quartz→cristobalite→tridymite. (3) Through SEM observation, it was found that molten phase formed in the sintered compacts with alkali metal oxide. The molten phase is hypothesized to be a factor determining the crystallization and phase transformation of sintered spherical silica.

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