The Bending Strength and Microwave Properties of xAl2O3+ (1-x) BaO-Al2O3-B2O3-SiO2-ZnO Glass-Ceramics

In this work, a new microwave dielectric material for LTCC applications, xAl2O3+ (1-x) BaO-Al2O3-B2O3-SiO2-ZnO (x=0.3, 0.4, 0.5 and 0.6) glass-ceramics, was synthesized. The effect of Al2O3 on the microstructure, mechanical properties and electrical properties of BaO-Al2O3-ZnO-B2O3-SiO2 glass-ceramics was studied in this paper. The crystallinity was studied by jade6.5 software using the whole pattern fitting method. The XRD analysis showed that the content of BaAl2Si2O8 increased first and then decreased with the increase of Al2O3 content. It is found that the formation of phase BaAl2Si2O8 contributes to strong bending strength. The xAl2O3+ (1-x) BaO-Al2O3-SiO2-ZnO-B2O3 glass-ceramics sintered 2h at 920°C has the excellent microwave dielectric properties at x=0.4, εr=7.4, tanσ=1.49×10-3 at 13.5GHz, τf=-42.67ppm/°C, flexural strength= 184MPa.