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Published in:
01-11-2015
Crystallization, sinterability and dielectric properties of CaO–B2O3–SiO2 glass ceramics with Al2O3 additives
Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2015
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Abstract
Glass–ceramic materials of the CaO–B2O3–SiO2 (CBS) system added with various amounts of Al2O3 have been prepared by conventional melting and heat treated crystallization method. The effects of Al2O3 on the sintering characterization and dielectric properties have been investigated. With increasing the Al2O3 content, the bending and stretching vibrations in [SiO4]2− became weak. XRD patterns of samples with ≥3 wt% Al2O3 introduce cyclowollastonite (α-CaSiO3) as single crystallized phase of sintered glass–ceramics. It is found that the optimal sintering temperature for this glass ceramics is 800 °C for 30 min, and the sinterability was obviously improved by Al2O3 additive. CBS glass ceramics sample with 5 wt% Al2O3 achieved the best sintering characterization and dielectric properties (εr ≈ 7, tan δ = 1.9 × 10−3 at 1 MHz), which is proposed to be suitable for LTCC application.