超细氧化钇粉体的制备

湿化学法制备超细粉体时，反应、分离、干燥以及灼烧都不同程度地影响粉体的粒径及团聚。在传统的草酸沉淀法制备氧化钇基础上对溶液的浓度、pH值以及表面活性剂的选择和用量、颗粒的表面电位进行了考察研究，确定了反应过程中影响粉体粒径的各个因素，得到一次粒径50－100nm，平均粒径0.521μm，晶型良好且具有单分散趋势的超细氧化钇。

Preparation of Ultrafine Yttrium Oxides Powders

In the process of preparation ultrafine powders with wet chemical method, the reaction, flitration, drying and calcination will affect the powders size and agglomeration. The effect of the reaction concentration, pH value, the kinds of surfacants and its concentration and the Zeta potential of the precipitation particles on the process of preparation ultrafine yttrium oxide powders with the method of oxalate precipitation were discussed. The experiment showed that the pH value and the surfacants affected the Zeta-potential of the precipitation particles and then decided the size and agglomeration of the yttrium oxalate precursor. The optimum reaction conditions were ascertained and fine crystal form and dispersal ultrafine yttrium oxides with the initial size 50~100nm, average sizes 0.521 mm were synthesised. This clarified that it is possible to prepare ultrafine yttrium oxides by controlling reaction conditions on the basis of traditional method of oxalate precipitation.