Low temperature sintering and dielectric properties of Ca-Ba-Al-B-Si-O glass/Al₂O₃ composites for LTCC applications

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 ɛ _r value of 7.55 and a tan δ value of 0.00053 (measured at 10 MHz) and a well matching with Ag electrodes.

Keywords

borosilicate glass / SiO₂ / casting / FTIR / microstructure / dielectric properties

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