Preparation and properties of ZBS-Al₂O₃ glass-ceramics

Al₂O₃ ceramics with different amounts of ZnO-B₂O₃-SiO₂(ZBS) glass addition were prepared by a traditional solid solution process. The sintering behavior, microstructure and properties of ZBS-Al₂O₃ glass-ceramics were investigated. The results show that with the increase of glass content, the sintering temperature of glass-ceramics decreases, dielectric constant (ε) increases first and then decreases, while the insulation resistivity (ρ) exhibits the opposite trend. Additionally, the dielectric loss (tan δ), thermal expansion coefficient (α), and hardness (R_h) decrease. The glass-ceramic sample with composition of 0.7ZBS-0.3Al₂O₃ possesses the optimal properties. Its sintering temperature is 950°C with the following property parameters: dielectric constant ε=6.5, tan δ=0.8 × 10^-3 at 1 MHz, ρ=2.64 × 10¹³ Ω·cm, α=5.42 × 10^-6 K^-1, and R_h=595 MPa, all of which meet the requirements of electronic packaging substrate materials.