摘要
分别采用超临界流体干燥和真空干燥，经煅烧制备γ-Al2O3粉体，再用TEM和XRD考察不同制备途径对产物晶态、形貌、尺寸的影响。结果显示。①超临界流体干燥能有效地对γ-Al2O3前驱体粉体进行脱水，防止硬团聚的形成。该前驱体在800℃下煅烧2h可制得纤雏状及球形、分布较均匀、轻度团聚的γ-Al2O3超细粉体，其纤维长度50～200nm，直径约5～15nm，球形颗粒直径介于30～100nm之间。②真空干燥将导致γ-Al2O3硬团聚。
The precursor of ultrafine γ-alumina is prepared by supercritical fluid drying or vacuum drying from a solution of Al（NO3）2 in alcohol , then the precursor is calcined. The samples are characterized by TEM and XRD. The most important is to inspect how the different preparation crafts influence the products＇ crystal structure, feature and dimensions. The results show that the supercritical fluid drying can effectively dehydrate the precursor during drying and prevent the formation of agglomeration. The precursor is calcined at 800℃ for 2h, then the fibrous and spherical γ-alumina particles with size range from several nanometers to two hundred nanometers, homogeneous dispersion, slight agglomeration can be obtained.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2006年第2期143-144,134,共3页
Materials Reports
基金
湖北省教育厅重点科研资助项目(2002A01018)
作者简介
孙少学：男，1963年生，工程师 Tel：027-68862277 E-mail：sshxue@yahoo．com．cn
