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1 2010

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Fabrication of magnesium aluminum silicate glass ceramics by sintering route

Durrani S. K., Hussain M. A., Hussain S. Z., Hussain S. Z., Akhtar J., Saeed A., Hussain N., Ahmed N.

Materials Science Poland

2010

Vol. 28, No. 2

459--466

Magnesium aluminum silicate (MAS) glass ceramic material was prepared by the sintering route. A three-stage heat treatment, consisting of calcination, nucleation and crystallization, was developed with MgF2 as a nucleating agent. The effect of the percentage chemical composition and the sintering temperature on the density of the compacted material was also studied. The thermal stability of MAS was measured by thermogravimetry (TG), differential thermal analysis (DTA). TG/DTA studies revealed that the powder exists as MgO-Al2O3-SiO2-H2O in solid state, and then transforms to MgO-Al2O3-SiO2 via some metastable intermediates above 300 °C. The microstructure and phases were analyzed by X-ray diffractometry (XRD). XRD analysis revealed the formation of various phases such as magnesium silicate, fluorophlogopite, nobergite, siliminite etc. at various processing temperatures.