Abstract
The effects of various SiO2 contents on both the microstructures and properties of Ca-Ba-Al-B-Si-O glass/Al2O3 composites were investigated by FTIR, DSC, XRD and SEM. The experimental results show that increasing SiO2 content in the glass leads to the increase of [SiO4] units, increases the continuity of glass network, and decreases the trend to crystallization of composites. The shrinkage of samples rises rapid around the glass softening temperature and the final shrinkage of samples decreases with increasing SiO2 content in the glass. Borosilicate glass/Al2O3 composites with 60wt% SiO2 sintered at 875 °C for 15 min show better properties: a bulk density of 3.10 g·cm−3, a porosity of 0.23%, a ɛr value of 7.55 and a tan δ value of 0.00053 (measured at 10 MHz) and a well matching with Ag electrodes.
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