两步水热法制备超细纳米颗粒钇稳定氧化锆

采用两步水热法制备钇稳定氧化锆(YSZ)的超细纳米颗粒.利用X射线衍射仪、透射电子显微镜研究pH值以及分散剂和阳离子浓度对YSZ粉体的相组成、相结构和晶粒大小的影响.结果表明,两步水热法制得的YSZ粉体具有立方相结构,平均晶粒尺寸约为6nm；pH值越大,越利于立方相的生成,pH为12时,YSZ粉体为纯立方相；无水乙醇作为分散剂,可以有效地减少粉体的团聚；阳离子浓度过高时(2 mol/L),不利于立方相生成,在阳离子浓度适当(约0.02～0.05 mol/L)的前提下,稍大的阳离子浓度得到的粉体粒径较小,团聚较少,最佳的阳离子浓度为0.05 mol/L.

Preparation of ultra-fine yttria-stabilized zirconia nanoparticles by two-step hydrothermal process

Ultra-fine yttria-stabilized zirconia(YSZ) nanoparticles were prepared by two-step hydrothermal process.The effects of pH value、dispersant and cation concentration on the phase component、phase structure and grain size of YSZ powders were studied by X-ray diffraction and transmission electron microscopy.The results show that YSZ powder prepared by two-step hydrothermal process has cubic phase structure and its average grain size is about 6 nm.YSZ tends to be cubic phase of zirconia as the pH value increasing,and when pH value is 12,pure cubic phase of YSZ can be obtained.Higher cation concentration,2 mol/L,is hardly to get cubic phase YSZ.Using ethanol as dispersant can effectively reduce agglomeration of YSZ powders.The average size and the aggregation of YSZ powder prepared at different cation concentrations show that the optimal cation concentration is 0.05 mol/L.