Effect of SiO2 content on the sintering kinetics, microstructures and properties of BaO-Al2O3-B2O3-SiO2 glass-ceramics for LTCC application

The SiO2 content had a significant influence on the microstructure, mechanical, thermal, and electrical properties of BaO-Al2O3-B2O3-SiO2 glass-ceramics. The sintering kinetics suggested that the SiO2 content changed the activation energy and affected the sintering process significantly. XRD analysis identified that with increasing SiO2 content, the major crystal phase was changed from sanbornite to quartz and the minor phase cristobalite was precipitated. The change of vibrational modes detected by Raman spectrum was in accordance with the results of XRD. Owing to the variation of crystal phase content, the coefficient of thermal expansion was increased. Moreover, a modified model was established for calculating CTE values, which were consistent with experimental data. Meanwhile, the flexural strength and the Young's modulus remarkably increased from 67 to 150 MPa and 45-66 GPa, respectively. BABS glass-ceramic with 50 wt% SiO2 showed excellent characteristics: sigma = 150 MPa, E = 66 GPa, CTE = 13.37 x 10 (-6)/degrees C, epsilon(r) = 6.0, tan delta = 6.4 x 10(-4), indicating its potential for CBGA package. (C) 2017 Elsevier B.V. All rights reserved.