Ceramics-Silikáty 55 (3) 246-250 (2011)

Preparation and Characterization of Lightweight Mullite-Silica Rich Glass Aggregates

Y. Li, N. Li, W. Yan, G. Liu

Phase compositions, microstructures and properties of four lightweight mullite-silica rich glass aggregates with high strength were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and FactSage 6.2 software. It was found that the lightweight aggregates with higher Al₂O₃ content had higher mullite content, porosity and larger mullite crystallites, but lower content and viscosity of melt at elevated temperature. Most of Fe₂O₃ and TiO₂ were incorporated in mullite and most of K₂O and Na₂O were in glass to reduce viscosity of melt at elevated temperature.

Keywords: Lightweight, Mullite, Silica rich glass, Viscosity, Composition