Abstract
ZnO-B2O3-SiO2 glass-ceramics, with the same Si/B molar ratio (0.7) and different Zn/B molar ratios (1.6–2.1) have been prepared by quenching glass melt and heat treatment between 680 °C and 720 °C. DSC analysis has demonstrated that the crystallization activation energy (Ea) of the Zn2SiO4 phase increased with increasing Zn/B ratio, and the glass crystallization process was transformed from a two-dimensional to a one-dimensional growth. DSC curves are consistent with the deformation and viscosity curves and can be attributed to the crystallization behavior of glass. The glass-ceramic with Zn/B = 1.7 sintered at 700 °C for 30 min exhibited the best properties: εr = 6.35; tanδ = 4.3 × 10−3 (11.39 GHz); CTE = 3.8 × 10−6 /K.
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