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Studies on the Low-Temperature Synthesis of Fine α-Al 2 O 3 Powder by Precipitation Route
Glass Physics and Chemistry ( IF 0.7 ) Pub Date : 2020-09-02 , DOI: 10.1134/s1087659620040033
Pallavi Suhasinee Behera , Sunipa Bhattacharyya

Abstract

Fine alpha-alumina (α-Al2O3) powder was prepared by simple precipitation technique using aluminium salt and ammonia as a precipitating agent. In this method, an aqueous solution of aluminium nitrate and ammonia were mixed with continuous stirring both in the presence and in the absence of polyethylene glycol (PEG). A controlled pH range of 7.5–8.5 was maintained throughout the synthesis process. A comparative study between the alumina powder prepared in the presence and absence of PEG was drawn into attention. The washing of the precipitate was deliberately avoided in one case to study the effect of washing on phase formation temperature. The synthesized powders were calcined at different temperatures and characterized by X-ray diffraction study, thermal analysis, infrared analysis, microstructural study, and particle size analysis. The results showed less agglomerated fine alumina powder formation in its pure α-Al2O3 phase at 1050°C in the presence of PEG.


中文翻译:

沉淀法低温合成α-Al2 O 3细粉的研究

摘要

细的α-氧化铝(α-Al系2 ö 3用铝盐和氨作为沉淀剂,通过简单的沉淀技术制备粉末。在该方法中,在存在和不存在聚乙二醇(PEG)的情况下,在连续搅拌下将硝酸铝和氨的水溶液混合。在整个合成过程中,pH值控制在7.5-8.5之间。在存在和不存在PEG的情况下制备的氧化铝粉末之间的比较研究引起了关注。为了研究洗涤对相形成温度的影响,在一种情况下有意避免洗涤沉淀物。合成的粉末在不同的温度下煅烧,并通过X射线衍射研究,热分析,红外分析,微观结构研究和粒度分析进行表征。在PEG存在下于1050°C的2 O 3相。
更新日期:2020-09-02
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