Effect of anions on preparation of ultrafine α-Al2O3 powder
来源期刊：中南大学学报(英文版)2007年第6期
论文作者：肖劲 秦琪 万烨 周峰 陈燕彬 李劼 刘业翔
文章页码：773 - 773
Key words：α-Al2O3; ultrafine powder; homogeneous precipitation; anion; mutual compound
Abstract: Ultrafine alumina power was obtained by calcining the precursor at 1 200 ℃ for 2 h, which was prepared by homogeneous precipitation method using aluminium salts and urea as raw materials. The effects of anions on the morphology, particle size, surface area and configuration of the precursors were studied. The results show that the reactions of urea with aluminium nitrate and aluminium chloride result in agglomerates gels with bad filtering performance, the morphology is fibrillar. Aluminium sulphate-urea reactions result in the direct formation of amorphous powders with good filtering performance, of which morphology are regular spherical particles with larger granularity and smaller surface area. The reaction of mutual compound of aluminium sulphate and aluminium nitrate with molar ratio of 40:60 with urea can produce precursor with good filtering performance, spherical morphology, and uniform granularity distribution in the particle size range of 2-3 μm.
基金信息：the Natural Science Foundation of Hunan Province, China
