摘要
以ZrOCl_2·8H_2O,Ce(NO_3)_3·6H_2O为起始原料,氨水为沉淀剂,用共沉淀法结合喷雾干燥、真空冷冻干燥和超临界流体干燥技术制备了铈稳定四方氧化锆纳米级超微粉体,用热重-差示扫描量热计(TG-DSC)、X射线衍射分析仪(XRD)、物理吸附仪(Autosorb-MP-1)等仪器就制备方法对粉体的表面、孔径分布、晶粒尺寸和相对结晶度等性能进行了研究,结果表明:3种方法制得的初始粉体的颗粒尺寸分别为6.19,7.05和2.27 nm,比表面积分别为162.88,143.00,444.50 m^2/g。从室温到900℃,随着煅烧温度的提高,SPD法和VFD法制备的试样颗粒度显著粗化,而SCFD法制备的粉体粒度粗化则较慢。粉体材料的晶化温度、堆密度、相对结晶度和孔体积随制备方法的不同而有较大差异。
The reaction of ZrOCl2·8H2O and Ce（NO3）3·6H2O with ammonia as the precipitant yielded nanometer-sized ceria stabilized zirconia powders by coprecipitation via spray drying, vacuum freezing and supercritical fluid drying processes. The effects of the different drying routes on the surface structures, pore size distribution, crystal size and relative crystallinity of the powders were investigated based on the measurements using thermogravimetry-differential scanning calorimeter （TG-DSC）, X-ray diffraction （XRD） and physical adsorptions apparatus （Autosorb-MP-1）. The results showed that the particle sizes of the powders from the SPD, VFD and SCFD methods were 6.19, 7.05, 2.27 nm respectively and their specific surface areas were 162.88, 143.00, 444.50 m^2/g, respectively. The particles produced by SPD and VFD increased with the increasing calcination temperatures from room temperature to 900℃. The crystallization temperature, apparent density, crystallinity and pore volume of the powders from the different drying were processes showed also different.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期813-816,共4页
Rare Metal Materials and Engineering
基金
濮耐高温科学研究专项基金资助(2006083108)
作者简介
贺中央，男，1966年生，博士研究生，高级工程师，北京科技大学材料与工程学院，电话：010-62332666，E-mail：ref1988@126．com
