Studies on the Structure of Transparent Glass Ceramics

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J. Korean Ceram. Soc. > Volume 27(2); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(2): 288.

투명 결정화유리의 구조에 관한 연구

박용완, 박원규, 김대혁

한양대학교 공과대학

Studies on the Structure of Transparent Glass Ceramics

ABSTRACT

Parent glasses for the experiments were prepared to be ratio of Li2O : Al2O3 : SiO2=4.5 : 25 : 70.5 as basic components, and TiO2 and ZrO2 in the mixing ratio of 1 : 1 were added as the nucleating agents, whose contents were increased in each sample. DTA, XRD, SEM, IR were observed, and thermal expansion and transmissivities were measured for the crystallized samples under the controlled heat-treatments. The transformation temperatures and the dilatometric softening temperatures in thermal expansion curves, and also the exothermic peaks in differential thermo-analytical curves were shifted to lower temperature. The crystal phase deposited through the heat-treatment was identified as ${beta}$-quartz solid solution with XRD and IR analysis. The crystalline phases in oopactified samples were ${beta}$-spodumene coexiting with ${beta}$-quartz solid solution. The samples having more than 3% nucleating agents were transparent. The crystallized grain sizes were ranged 0.05 to 0.1$mutextrm{m}$. The crystallized transparent samples were exceeded 85% in the transmissivity.