Crystallization Behavior of <TEX>$CaO.Al_2O_3.2SiO_2$</TEX> Glass with Kinetic Parameters

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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(12): 1545.

열분석에 의한 $CaO.Al_2O_3.2SiO_2$ 유리의 결정화 고찰

이승한, 류봉기, 박희찬

부산대학교 무기재료공학과

Crystallization Behavior of $CaO.Al_2O_3.2SiO_2$ Glass with Kinetic Parameters

ABSTRACT

Various kinetic parameters of the nucleation and crystallization in anorthite glass (CaO.Al2O3.2SiO2) were calculated by nonisothermal differential thermal analysis. Base glass and glass with TiO2 were prepared by melting. In base glass, the temperature where nucleation can occur ranges from 85$0^{circ}C$ to 9$25^{circ}C$ and the temperature for maximum nucleation was 900$pm$5$^{circ}C$. In glass with TiO2, the nucleation temperature range was 800~875$^{circ}C$ and the maximum nucleation temperature was 850$pm$5$^{circ}C$. Kissinger equation, Bansal equation, and modified Ozawa equation were used for calculating activation energy for crystallization, Ec. The results showed the same activation energies for both glasses with and without TiO2 in the different equations. The shape of maximum exotherm peak and Ozawa equation were used for Avrami exponent, n. The n value for each glass was 2, indicating that each glass crystallized primarily by bulk crystallization.