有机分散剂对球形氧化铝前驱体形貌的影响  

Influence of Organic Dispersant on Morphology of Spherical Alumina Precursors

作　　者：徐晓娟[1] 孙旭东[1] 李晓东[1] 刘绍宏[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第11期1544-1547,1551,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(U1302272;50972025;51102040);中央高校基本科研业务费专项资金资助项目(N100702001;N110802001);稀贵金属综合利用新技术国家重点实验室开放课题(SKL-SPM-201206;SKM-SPM-201214)

摘　　要：采用均匀沉淀法在较低浓度下制备的氧化铝前驱体呈单分散球形,在提高浓度后发生团聚并偏离球形.在反应物中加入聚乙烯吡咯烷酮(PVP)及聚乙烯醇(PVA)作为有机分散剂,可以改善粉体形貌和团聚状态.结果表明:1%的PVP可以有效改善粉体的团聚状态,但粉体粒度分布不均匀,继续增加PVP的用量使团聚现象加剧.PVA则能改善前驱粉体的形貌和粒度分布.当同时加入1%PVP和1%PVA其作用效果优于单独加入时,所制得的氧化铝前驱体呈球形无定型态,粒度约850 nm.Monodispersed spherical alumina precursors were prepared by homogeneous precipitation method at very low concentration. Increasing concentration leaded to aggregation and nonspherical powders. Polyvinylpyrrolidone （PVP） and polyvinyl alcohol （PVA） were added as organic dispersants to improve the morphology. The results showed that 1% PVP can improve the state of aggregation, but with the increasing of PVP amount, the dispersing effect will be worse. PVA can improve the morphology and size distribution of the presursors. The best effect is obtained when 1% PVP and 1% PVA are used together, and the precursors are amorphous and spherical with diameter of 850 nm.

关 键 词：均匀沉淀法 分散剂 PVP PVA 氧化铝前驱体 

分 类 号：TB321[一般工业技术—材料科学与工程]