Effect of UV irradiation on the densification behavior, microstructure, and microwave dielectric properties of low temperature sintering AlO ceramics.

In this paper, AlO ceramics co-doped with 0.3 wt%CuO-0.6 wt%TiO-0.1 wt%MnCO (CTM, the same below) were prepared. The effect of CTM and UV irradiation on the sintering behavior, microstructure, and microwave dielectric properties have been investigated systematically. The results indicate that the sintering temperature of AlO ceramics could be effectively decreased to about 1200 °C by adding 1 wt% CTM. UV irradiation can further increase the density of the AlO ceramics, improve its microstructure and microwave dielectric properties. By using the AlO powders UV irradiated for 15 min as raw materials, CTM co-doped AlO ceramics can sintered at 1200 °C with a high density of 3.93 g/cm and a very high Q ×  value of 175,086 GHz.