Studies on Transparently Crystallized Glass -On Li2O-Al2O3-SiO2 Composition-

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J. Korean Ceram. Soc. > Volume 26(3); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(3): 315.

투명 결정화 유리에 관한 연구 -Li2O-Al2O3-SiO2계 조성에 관하여-

박용완, 김건은¹, 연석주, 조중희

한양대학교 공과대학
¹한국유리기술연구소

Studies on Transparently Crystallized Glass -On Li2O-Al2O3-SiO2 Composition-

ABSTRACT

Li2O-Al2O3-SiO2 system glasses contained P2O5, TiO2 and ZrO2as the nucleating agents were melted and formed. The glass was subsequently heated first to nucleate and then to grow the crystals. At constant nucleating agent content the base glass compositions were varied and the influences of these variations on the crystallization behaviour were investigated. The study was made by measurement of thermal expansion coefficient, differential thermal analysis, X-ray diffraction analysis, scanning electron microscope observation and transmission measurement of crystallized glass specimen in visible region. It was shown that the content of crystalline phase decreased with increasing SiO2 content as well as decresing Li2O in the base glass compositions. As the result of X-ray diffrection analysis, the major crystal was $beta$-quartz solid solution. The degree of crystallinity which was calculated using the noncrystalline scattering methods increased in S-shape with increasing heat treatment time. This change was similar to that in thermal expansion coefficient. The transmissions of 5mm thick samples were 80-90% in visible ray region.