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Glass-forming ability, sinter-crystallization behavior and microwave dielectric properties of MgO-B2O3-(Al2O3)-SiO2 glass-ceramics

Research paper by Sara Banijamali, Touradj Ebadzadeh

Indexed on: 06 Apr '16Published on: 31 Mar '16Published in: Journal of Non-Crystalline Solids



Abstract

The present work aims to survey sinterability, crystallization behavior and microwave dielectric characteristics of MgO-B2O3-SiO2 glass-ceramics in the presence of 1–10 weight ratios of Al2O3. It was shown that changing the base composition and addition of Al2O3 led to an increase in the glass-forming potential. Fully densified glass-ceramics were achieved by sintering below 950 °C from all selected compositions. During sintering, magnesium borate and magnesium silicate were formed in all specimens whilst cordierite was also crystallized in the specimens contained > 5 weight ratios of Al2O3. Based on the FESEM observation, magnesium borate and magnesium silicate adopted a nanometric spherical morphology and cordierite had a platelet-like morphology.

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