Synthesis and characteristics of borosilicate-based glass-ceramics with different SiO2 and Na2O contents

Our present work was initiated with the aim of optimizing the borosilicate-based glass-ceramics composites by adjusting SiO2 and Na2O composition in CaO-Al2O3-B2O3-SiO2 (CABS) glass slightly. To illustrate the functional mechanism of glass network former (SiO2) and the glass network amender (Na2O), we focused on the multiple performances of the composites by employing different qualitative and quantitative instruments. Results showed that decreasing SiO2 content or increasing Na2O content appropriately both could promote sintering densification, accelerate the formation of anorthite phases and lower the dielectric loss. CABS glass/Al2O3 composite with 54 wt% SiO2 content and 1 wt% Na2O content being sintered at 850 degrees C for 15 min exhibited the best properties. In addition, after co-firing with Ag electrodes, glass/Al2O3 composite could meet the shrinkage requirement of Ag electrodes and could not possibly react with Ag electrodes at 850 degrees C. Based on the above findings, the borosilicate-based glass/Al2O3 composites we have studied can be suitable for LTCC application. (C) 2015 Elsevier B.V. All rights reserved.