Effect of silica on the crystallization behavior and microstructure of mica glass-ceramics in the system SrO·4MgO·Al2O3·6SiO2·2MgF2

Ceramic Engineering Division, Department of Chemical Technology, University of Calcutta,
92, Acharya Prafulla Chandra Road, Kolkata-700 009, India
E-mail : prabir.maiti@gmail.com
Manuscript received 28 June 2016, revised 18 August 2016, accepted 26 August 2016

The effect of varying the SiO2 content on the crystallization and microstructural behavior of strontium containing glasses based on the system SrO·4MgO·Al₂O₃·6SiO₂·2MgF₂ was investigated by differential thermal analysis (DTA),X-ray diffraction (XRD) and scanning electron microscopy (SEM).

DTA analysis revealed that the glass transition temperature (T_g) and crystallization peak temperature (T_p) increased by increasing silica content. It was also shown that the higher the silica content, the lower is the aspect ratio of the fluorophlogopite crystals and appearance of pores in the body. The analysis of X-ray diffraction patterns revealed that strontium fluorophlogopite crystals exist as major phase in all heat treatment temperatures.