A Study on the Glass-Ceramics of the Cordierite System -the effects of -<TEX>$TiO_2$</TEX> Addition

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J. Korean Ceram. Soc. > Volume 30(12); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(12): 1054.

코디어라이트계 결정화 유리에 관한 연구 -$TiO_2$ 첨가 효과

박용완, 현부성, 정준상

한양대학교 무기재료공학과

A Study on the Glass-Ceramics of the Cordierite System -the effects of -$TiO_2$ Addition

ABSTRACT

The effects of TiO2 addition as a nucleating agent on the cordierite glass-ceramics were investigated. The glass compositiion was stoichiometric cordierite composition of 13.7MgO-34.9Al2O3-51.4SiO2(wt%), and TiO2 as a nucleating agent was added by 5, 10 and 15wt% in addition. The optimum amount of TiO2 addition and appropriate heat treatment schedule were determined by using dilatometer, DTA, XRDA and SEM. The composition containing 10wt% TiO2 was proved to be the best among the investigated compositions. And the optimum heat treatment schedule was 840℃-2h for the nucleation and 1140℃-2h for the crystallization. The properties were as follows. The crystallinity was ∼75%, thermal expansion coefficient 33×10-7/℃(25∼700℃), dielectric constant 7.6(1KHz) and Vicker's hardness 5.1GPa.