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分别采用基于Pechini法的溶胶低温燃烧法和共沉淀法制备了Sr_(0.9)Ce_(0.9)Y_(0.1)O_(3-δ)(SCY)超细陶瓷粉。应用X射线衍射、扫描电镜、能量散射谱和激光粒度分析仪对陶瓷粉体的结构和组成进行了表征,并研究了两种方法制备的粉体的烧结性能。结果表明:用溶胶低温燃烧法制备的SCY粉体为近似球形、粒径小于50nm,粒度分布范围窄,在1250℃烧结致密;用共沉淀法制备的粉体具有钙钛矿结构,粒径小于0.25μm、粒度分布窄,在1300℃烧结致密。此外,SCY致密膜具有一定的透氢作用,850℃氢渗速率在2×10-3mL.cm-2.min-1左右。
Sr 0.9 Ce 0. 0.9 O 3-δ SCY ultrafine ceramic powders were prepared by the sol-gel method and coprecipitation method respectively based on the Pechini method. The structure and composition of the ceramic powders were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and laser particle size analyzer. The sintering properties of the powders prepared by the two methods were also studied. The results show that the SCY powder prepared by sol-sol method has an approximate spherical shape with a particle size of less than 50 nm and a narrow particle size distribution. The powder is sintered compactly at 1250 ℃. The powder prepared by coprecipitation method has a perovskite structure with a particle size less than 0.25μm, narrow particle size distribution, sintered compact at 1300 ℃. In addition, the SCY dense membrane has a certain hydrogen permeation effect, and the hydrogen permeation rate at 850 ° C is about 2 × 10-3mL.cm-2.min-1.