摘要
利用低温超强碱法制备出了纳米四方多晶氧化锆粉体。为改善该粉体分散性较差、氧化钠含量较高的缺点 ,用有机物对粉体进行了表面改性处理 ,采用X射线荧光光谱、X射线衍射、透射电镜等对粉体性能进行了分析。结果表明 ,采用无水乙醇和柠檬酸铵对粉体进行改性处理 ,使得粉体粒度均匀、分布变窄 ,形态近球形 ,其中柠檬酸铵的处理效果尤为显著 ,使粉体平均粒径从 0 .6 9μm减小到 0 .5 4μm ;进一步的高分辨像分析结果表明 ,粉体颗粒多由 2～ 3个大小为 2 0～ 30nm的单晶组成 ,较大的团聚体较少 ,因此有机物对粉体的表面改性处理有利于获得分散性好、粒度均匀的高质量纳米氧化锆粉体。
The nanometer tetragonal polycrystal zirconia powder was prepared by the super alkaline method at low temperature.However,the prepared zirconia powder has the drawbacks of agglomerations and high Na 2O content as a result of sodium hydroxide used as one of the raw materials.Therefore the present work focuses on surface processing of the powders with the organic additives to solve the above problems.The properties of the powders after processed were studied by X-ray Fluorescence Analysis,X-ray Diffraction and Transmission Electron Microscopy.The results show that the properties of the powders are obviously improved after processed with ammonium citrate and water-free ethanol including the smaller particle size and narrower distributions,round shapes and homogeneous particle size.The additive ammonium citrate has more obvious effect minimizing the even particle size of the powder from 0.69 μm to 0.54 μm.The High Resolution Electron Microscopy Analysis results show that one powder particle makes up of two to three single crystals with the size from 20 nm to 30 nm,only a little big conglomeration.The surface processing with organtic additive is beneficial to obtain the perfect nanometer tetragonal polycrystal zirconia powder with even particle size and well-dispersed properties for the super alkaline method.
出处
《耐火材料》
CAS
北大核心
2004年第2期76-78,共3页
Refractories
