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以ZrOCl2·8H2O、Y(NO3)3·6H2O和Sc2O3为原料,聚乙二醇(PEG)为分散剂,无水乙醇/水(醇水体积比为5∶1)为溶剂,氨水为沉淀剂,采用正、反向共沉淀方法,控制体系pH=10,反应陈化12 h,凝胶干燥24 h,经600℃煅烧制得4.5 mol%Y2O3-ZrO2(YSZ)和0.6 mol%Sc2O3-YSZ纳米复合陶瓷粉末。通过透射电镜、X-射线衍射等表征,讨论分析以醇水为溶剂反向滴淀制备的ScYSZ粉末团聚程度低、粒径细小的原因。研究结果表明:以醇水为溶剂时,采用反向滴淀方式制备的粉末的粒径约为20 nm,粉末团聚较松散;采用正向滴淀制备的粉末粒径约为30 nm,粉末形成硬团聚体。
Using ZrOCl2.8H2O, Y (NO3) 3.6H2O and Sc2O3 as raw materials, polyethylene glycol (PEG) as dispersant and absolute ethanol / water (alcohol to water volume ratio of 5: 1) as solvent, (YSZ) and 0.6 mol% Sc2O3-YSZ were prepared by calcination at 600 ℃ using the coprecipitation method of positive and negative. The reaction system was pH = 10, the reaction was aged for 12 h and the gel was dried for 24 h. Nanocomposite ceramic powder. Through the characterization of transmission electron microscopy and X-ray diffraction, the reasons for the low degree of agglomeration and the small particle size of ScYSZ powder prepared by reverse precipitation with alcohol-water as solvent were discussed and discussed. The results show that when the alcohol water is used as solvent, the size of the powder prepared by the reverse titrimetric method is about 20 nm, and the powder agglomeration is relatively loose. The particle size of the powder prepared by the forward drop is about 30 nm and the powder forms Hard aggregates.