亚微米球形Y2O3粉体及其透明陶瓷的制备OA北大核心CSTPCD

Y2O3 ceramics is widely used as laser medium or optical window due to its excellent physical and chemical properties and high transparency in wide frequency band of 280 nm-8 pm.However,preparation of highly transparent Y2O3 ceramics still remains challenge due to its synthetic precursor and nano-powders difficult to meet the requirements.In this work,a spherical monodispersed and submicron-sized Y2O3 powder was prepared by a homogeneous precipitation method using yttrium nitrate and urea as raw materials.Structure,phase evolution and morphology of Y2O3 precursor and the calcined powder were studied by different methods.The synthesized particle precursor exhibits a sphere morphology with diamension around 330 nm,and Y2O3 powder calcined at 800 ℃ for 2 h shows spherical,well-dispersed and uniformed particles with dimension around 260 nm.Based on this spherical Y2O3 powder,transparent Y2O3 ceramics were fabricated by vacuum sintering at 1780 ℃ using 0.3％(in atom)Nb2O5 as sintering additive.The in-line transmittances of Y2O3 ceramics with thickness of 1 mm reach 76.9％at a wavelength of 1100 nm and 65.6％at a wavelength of 400 nm.In conclusion,this study provides a new promising method for preparing Y2O3 transparent ceramics with excellent properties.