摘要
以硝酸铝和碳酸氢氨为主要原料,在超声场中采用化学沉淀法制备纳米γ-氧化铝粉末。实验研究了反应物的滴加顺序及方式对氧化铝粒径的影响,用正交试验法优化了制备工艺,并用扫描探针显微镜(SPM)、XRD、TEM技术对粉末进行了表征。结果表明:硝酸铝溶液一次性加入到碳酸氢氨溶液中,可获得较小的纳米颗粒,体系中含有乙醇可以减轻团聚现象的产生。900℃下,在硝酸铝与碳酸氢氨的物质的量之比为1/8,混合方式是硝酸铝一次性加入碳酸氢氨溶液中,水与乙醇的体积比是1/1时,煅烧1.25小时可获得38.6 nm左右的纳米γ-氧化铝粉。
The nanosized γ- alumina powders were synthesized by aluminum nitrate and ammonium bicarbonate as raw materials in ultrasound fields. The effects of adding sequence and mode of reactants on particle size were investigated. The optimum processes were determined by orthogonal experiment. And the heat - treated powders were characterized by XRD, SPM400 scanning probe microscope and TEM. The results show that the smaller nanosized γ- A12O3 powders were obtained when the entire Al（NO3）3 was added into NH4HCO3 solution at one moment. And the alcohol in reactant system has shown to reduce the agglomeration of the nanoparticle. At 900 ℃, the size of γ - alumina powders, as - prepared, is about 38.6 nm, when the mole ratio of aluminum nitrate to ammonium bicarbonate is 1/8; the volume ratio of water to ethanol is 1 and adding Al（NO3）3 into NH4HCO3 at one moment, calcinations time is 1.25 h.
出处
《轻金属》
CSCD
北大核心
2008年第2期25-28,共4页
Light Metals
