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中文摘要：
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.
英文摘要：
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.
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