以Al2(SO4)3·18H2O、尿素为原料,采用水热-热解法制备α-Al2O3粉体.用XRD、SEM对产物进行表征,研究了水热反应时间、表面活性剂PEG2000、添加剂AlF3等因素对产物形貌的影响.结果表明:120℃水热反应6h,前驱体经1200℃煅烧,用Al2(SO4)3·18H2O/尿素体系得到球形α-Al2O3;分别以表面活性剂PEG2000和AlF3为添加剂,得到纤维状及片状α-Al2O3.讨论了不同形貌α-Al2O3的形成机制.
α-Al2O3 powders with different shapes were prepared from the reaction of aluminum sulfate octadecahydrate and urea by hydrothermal pyrolysis method.The as-prepared products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The effects of reaction time and additives such as PEG 2000 and AlF3 on the morphologies of the products were evaluated.Without additives,spherical a-Al2O3 powders were obtained at 120 ℃ for 6 h followed by calcination at 1200 C.When using PEG 2000 and AlF3 as additives,fiber-and tabular-shaped α-Al2O3 powders were obtained under the same reaction conditions respectively.In addition,the reaction mechanisms of the formation of α-Al2O3 powders with different shapes were discussed.
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