Abstract
? 2022 Elsevier B.V.0.79ZnAl2O4-0.21TiO2 microwave dielectric ceramics are ideal materials for preparing 5 G lens antennas. However, conventional processing methods are difficult to meet the requirements of microwave devices for high precision and designed complicated structures. Additive manufacturing technologies provide opportunities for the fabrication of these devices. Herein, we fabricated 0.79ZnAl2O4-0.21TiO2 ceramics by digital light processing (DLP). The slurry with 2 wt% dispersant content showed favorable dispersion effect and stability. The optimal penetration depth of 44.64 μm and critical energy dose of 3.04 mJ/cm2 were obtained. After sintering, the 0.79ZnAl2O4-0.21TiO2 ceramic only kept ZnAl2O4 phase and TiO2 phase. The relative density could reach 95.29%, which is comparable to that of dry-pressed sample. With the increase of sintering temperature, dielectric constant (εr) and quality factor (Q×f) of 0.79ZnAl2O4-0.21TiO2 ceramic increased first and then decreased. The sintered ceramic at 1550 °C exhibited excellent microwave dielectric properties (εr = 11.55, Q×f = 62,266 GHz, τf = ?0.64 ppm/°C). The results indicate that DLP is a promising technology to fabricate high-performance microwave dielectric ceramics with complex structures.
NSTL
Elsevier