The Influence of CaF2 Doping on the Sintering Behavior and Microwave Dielectric Properties of CaO-B2O3-SiO2 Glass-Ceramics for LTCC Applications

With the rapid development of microelectronic information technology, packaging has higher requirements in terms integration density, signal transmission speed, and passive component integration. Low temperature co-fired ceramics (LTCC) exhibit excellent dielectric properties low sintering properties, which meets above-mentioned requirements. This work investigates effects CaF2 doping (0–16 mol%) on glass structure, behavior, crystallization, microstructure, microwave CaO-B2O3-SiO2 (CBS) glass-ceramic system. Glass-ceramics were prepared using conventional melting quenching method. The physical chemical glass-ceramics analyzed various techniques including TMA, SDT, FTIR, XRD, SEM, a network analyzer. results indicate that can effectively reduce softening CBS ceramics. It also substantially improves densification, dielectric, mechanical properties. appropriate amount CaF2-doped be sintered below 800 °C with constant loss at high frequency (εr < 6, tanδ 0.02 @ 10~13 GHz). Specifically, 8 mol% doped 790 thermal εr ~ 5.92 11.4 GHz, 1.59 × 10−3, CTE 7.76 10−6/°C, λ 2.17 W/(m·k), are attractive for LTCC applications.