Abstract
This paper studied that the influence of changes in the TiO 2 content on the glass structure of CaO-Al 2O 3-SiO 3 system and the formation of crystalline phases on reheating. The activation energy (E) for crystal growth and the Avrami parameter (n) have also been evaluated by means of differential thermal analysis (DTA) techniques. The value of the Avrami parameter (n) agrees well with scanning electron microscopy (SEM) observations of dendritic crystal growth from surface nuclei. In all the CaO-Al 2O 3-SiO 3 system glasses studied, dendritic crystals were observed. The greater the TiO 2 content, the lower were the glass transition temperature, T g, and crystallization peak temperature, T p. The high value of T p did not mean that value of E was large. The most effective addition of TiO 2 was about 10.8% (by mass) in the CaO-Al 2O 3-SiO 2 system glasses. The difference of E between the base glass (no TiO 2 added) and the glass containing most effective addition of TiO 2 was very little. The experimental results suggest that in the studied samples, TiO 2 cannot promote the crystallization very effectively.
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