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有机分散剂对球形氧化铝前驱体形貌的影响
引用本文:徐晓娟,孙旭东,李晓东,刘绍宏.有机分散剂对球形氧化铝前驱体形貌的影响[J].东北大学学报(自然科学版),2014,35(11):1544-1547.
作者姓名:徐晓娟  孙旭东  李晓东  刘绍宏
作者单位:(东北大学 材料与冶金学院, 辽宁 沈阳110819)
基金项目: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850nm.

关 键 词:均匀沉淀法  分散剂  PVP  PVA  氧化铝前驱体  

Influence of Organic Dispersant on Morphology of Spherical Alumina Precursors
XU Xiao-juan;SUN Xu-dong;LI Xiao-dong;LIU Shao-hong.Influence of Organic Dispersant on Morphology of Spherical Alumina Precursors[J].Journal of Northeastern University(Natural Science),2014,35(11):1544-1547.
Authors:XU Xiao-juan;SUN Xu-dong;LI Xiao-dong;LIU Shao-hong
Institution:School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
Abstract: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 850nm.
Keywords:homogeneous precipitation  dispersant  polyvinylpyrrolidone(PVP)  polyvinyl alcohol(PVA)  alumina precursor  
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