喷射沉淀法制备纳米а-Al2O3粉体

摘要

以NH<,3>·H<,2>O和Al<,2>(SO<,4>)<,3>,为原料,通过喷射沉淀法制备了Al<,2>O<,3>前驱体--水合氧化铝(AIOOH),将该前驱体洗涤、干燥、煅烧,获得了窄分布的纳米α-Al<,2>O<,3>粉体.采用XRD、红外光谱和激光粒度分析等测试方法对产物进行表征,结果表明,最后得到目标产物为α-Al<,2>O<,3>,平均粒径为30.9 nm,粒径范围30.1～32.3 nm.通过喷射沉淀法,采用高速剪切分散加强湍流搅拌作用的特殊沉淀机理,大幅度降低了α-Al<,2>O<,3>粒度.%Using NH3 · H2O and Al2(SO4)3 as raw materials,the precursor of α-Al2O3 was prepared by spray-precipitation method.The nanometer α-Al2O3 powder with narrow distribution was obtained after washing,drying and calcining the precursor.The products were characterized by X-ray diffractometer(XRD) ,particle size analyzer and Fourier transform infrared spectrometer(FTIR).Results show that the product is α-Al2O3 powder,and its mean particle size is 30.9 nm,and its range of particle size is from 30.1 nm to 32.3 nm.