燃烧法制备γ-Al2O3粉体及其表征

摘要

以硝酸铝、甘氨酸为原料,采用燃烧合成法制备γ-Al2 O3粉体,利用XRD,SEM,TG-DTA等手段对所制备的γ-Al2 O3粉体进行表征,考察反应溶液pH值、硝酸铝与甘氨酸配比、煅烧温度对纳米γ-Al2O3粉体粒径和纯度的影响.结果表明,制备γ-Al2 O3粉体的最佳工艺条件为:硝酸铝与甘氨酸物质的量比为3∶5,pH值为2,煅烧温度为750℃.在此条件下可制备出高纯度蓬松状γ-Al2O3粉体.%num nitrate and glycine as raw materials. The prepared y-Al2O3 powder was characterized by means of X-ray diffraction (XRD) , scanning electron microscope (SEM) and thermogravimetric-differential thermal analysis (TG-DTA). The influence of solution pH value, raw materials molar ratio and calcination temperature on the particle size,purity and morphology of γ-Al2O3 powder were investigated. Under the optimal preparation conditions of aluminum nitrate/glycine molar ratio of 3 ∶ 5,a solution pH value of 2 and a calcination temperature of 750 ℃ ,fluffy y-Al2O3 powder with high purity could be obtained.