Crystallization of 90wt% Cordierite-10wt% Enstatite Melt by <TEX>$TiO_2$</TEX> Addition

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J. Korean Ceram. Soc. > Volume 23(5); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(5): 9.

90wt% Cordierite-10wt% Enstatite 총체의 $TiO_2$ 첨가에 의한 결정화

이준, 한덕현, 주동수, 전정필

인하대학교 공과대학 무기재료공학과

Crystallization of 90wt% Cordierite-10wt% Enstatite Melt by $TiO_2$ Addition

ABSTRACT

The effect of $TiO_2$ addition to the 90wt% Cordierite-10wt% Enstatite base glass was investi-gated to understand the crystallization behavior of the glass. Glasses with addition of $TiO_2$ less than 7, 5wt% had a tendency of surface crystallization and were cracked when heat treated and in this case the crystalline phase formed was indialite. glasses with addition of $TiO_2$ more than 10wt% to 15wt% were crystallized in bulk when heat treated and were suitable for glass-ceramics. The highest microhardness 1640kg/$mm^2$ was obtained when the glass of 12.5wt% $TiO_2$ addition was heat treated at 762$^{circ}C$ for 60 minutes for nucleation and at 1135$^{circ}C$ for 20 minutes for crystal growth and in general higher microhardness was obtained when crystalline phase of magnesium aluminum titanate and $mu$-cordierite were developed. Avrami equation for crystal growth kinetics was applicable in glasses of less than 7.5 wt% $TiO_2$ addition and in case of glasses of more than 10wt% $TiO_2$ addition it was not applicable because of too fast crystal growth.