Effect of B₂O₃ Additives on the Sintering and Dielectric Behaviors of CaMgSi₂O₆ Ceramics

Huanping Wang, Shiqing Xu, Suya Zhai, Degang Deng and Haidong Ju College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China

摘 要：The effects of B2O3 addition, as a sintering agent, on the sintering behavior, microstructure and dielectric properties of CaMgSi2O6 ceramic have been investigated. The CaO-MgO-B2O3-SiO2 glassy phase came forth by adding B2O3 into CaO-MgO-SiO2 ceramic powders, and it was advantageous to lower the synthesis temperature of CaMgSi2O6 crystalline phase. Moreover, the emergence of CaO-MgO-B2O3-SiO2 glass phase could effectively lower the sintering temperature of CaMgSi2O6 ceramic and promote the CaMgSi2O6 grains growing. With 6 wt pct B2O3 addition, the densification temperature of CaMgSi2O6 ceramic could be effectively reduced from 1300 to 1100℃, and the dielectric constant （εr） and dielectric loss （tanδ） were: εr=7.61 and tanδ=7.4×10-4 （1 MHz）.

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