采用无水乙醇基浆料结合喷雾造粒工艺制备YAG透明陶瓷粉体, 通过扫描电子显微镜、压汞仪、能谱仪及紫外–可见–红外透过光谱系统研究了不同PVB粘结剂添加量下YAG造粒颗粒的形貌、尺寸、成型性能及其破碎行为, 对成型素坯的孔分布及烧制透明陶瓷的显微结构及光学性能进行了详细表征.在优化PVB添加量为1.0wt%时,造粒粉体为实心单分散颗粒,球形度高、化学均匀性好,其平均粒径约为40μm,成型性能优异;在75 MPa压力下, 造粒颗粒完全破碎形成密实均一的坯体结构.烧结后的YAG透明陶瓷显微结构均一, 无气孔及其他缺陷, 光学质量优异.
YAG transparent ceramic powders were prepared by spray drying method with anhydrous ethanol suspen-sion. The morphology, size, forming performance and crushing behavior of granulated particles with different PVB binder contents, the pore distribution in green compacts as well as the microstructure and optical properties of sintered ceramics were investigated by SEM, mercury injection, EDS and UV-Visible-Infrared transmission spectroscopy. The optimal content of PVB is 1.0wt%. The granulated particles exhibit excellent forming performance with mono-dispersed and fully dense aggregates. They have high spherical degree and high chemical uniformity. Their mean size is ~40μm. The granulated particels are completely crushed under 75 MPa pressure and form uniform and compact structure of green compacts. The sintered YAG transparent ceramics have good optical properties with ho-mogeneous microstructure and without pore and defects.
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