Abstract
The sintering characteristics, microstructures and dielectric properties of Ca–B–Si–O glass/alpha-Al2O3 materials at different MgO and Na2O contents were studied. The addition of MgO and Na2O in glass could regulate and manage the glass softening and crystallization, and further improved the sintering characteristics and dielectric properties of Ca–B–Si–O/Al2O3 glass + ceramic composites. The bulk density, thermal conductivity and dielectric constant curves elevated from 0 to 2 wt% at MgO and Na2O content, and then declined with the further increase of MgO and Na2O content, while the dielectric loss curve exhibited the converse varying trend. Phases and microstructures analysis showed that Ca–B–Si–O/Al2O3 glass + ceramic composites with 2 wt% MgO and Na2O content were composed of glass with amorphous structure, pores, crystalline phases of alpha-Al2O3 and CaAl2SiO8 with the triclinic unit cell that was formed by the typical chemical reaction of Ca2+, Al3+, Si4+, O2− ions in the glass. By contrast, Ca–B–Si–O /Al2O3 glass + ceramic composites with 2 wt% MgO and Na2O content at 850 °C exhibited better properties of ρ = 3.06 g/cm3, λ = 3.23 W/m K, er = 7.82 (at 7 GHz), tan δ = 1.3 × 10− 3 (at 7 GHz), and a well chemical and co-fired compatibility between glass + ceramic composites and Ag electrodes.
Published Version
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