Microstructure and Crystallization of MAS Glass-ceramics Containing Alkali Oxides

摘要

MgO-Al2O3-SiO2 glass-ceramics containing 4.0w% alkali oxides were prepared by conven tional melt quenching technique. The effects of heat treatment conditions on crystal types,microstructure and break strength of the glass-ceramics were studied by DSC,XRD. SEM and break strength tests. The main crystallization phases of this glass system are β-quartz (Li2-2xMgxAl2Si3O10) and β-Spodumene. no cordierite phase found. The glass-ceramics possessed a regular network-shaped microstructure feature formed by pyroxene crystals. With the increase of temperature, the β-Quartz around pyroxene crystals converted into β-spodumene and the regular network-shaped microstructure feature getting weaker and disappeared. The average break strength of the glass-ceramics containing no cordierite crystals based on MgO2-Al2O3-SiO2 system is about 150MPa,which is much high than the base glass.