(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 以Al2(SO4)3和CO(NH2)2为原料，通过均匀沉淀法制备出前驱物Al(OH)3，并煅烧得到超细α-Al2O3粉体。研究CO(NH2)2和Al2(SO4)3的摩尔比、Al2(SO4)3起始摩尔浓度、反应温度、反应时间等对前驱物制备的影响。利用X射线衍射仪、扫描电镜、热重/差示扫描法(DTA/TGA)等多种现代分析检测技术对粉体的性能进行了表征。结果表明：在CO(NH2)2和Al2(SO4)3的摩尔比为10׃1、Al2(SO4)3起始浓度为0.05 mol/L、反应温度为90 ℃、反应时间为60 min的条件下，能得到分散性能良好、粒径为2 μm左右且粒度分布均匀的球形超细α-Al2O3粉体。
关键字: 超细α-Al2O3粉体；均匀沉淀法；分散；球形
by homogenous precipitation
（College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: Al(OH)3 was synthesized as the precursor by the precipitation reaction of aluminum sulfate and urea, which was calcined to get ultrafine α-Al2O3. The effects of mole ratio of CO(NH2)2 to Al2(SO4)3, initial concentrations of Al2(SO4)3, reaction temperature and reaction time on the preparation of α-Al2O3 were investigated. The structural properties of powder were characterized by X-ray diffractrometry, scanning electron microscope and DTA/TGA measurements. The results show that spherical ultrafine α-Al2O3 powder with non-aggregation and the average particle size of about 2 μm was produced under the conditions: mole ratio of CO(NH2)2 to Al2(SO4)3 is 10׃1, initial concentration of Al2(SO4)3 is 0.05 mol/L, reaction temperature is 90 ℃ and the reaction time is 60 min.
Key words: ultrafine α-Al2O3 powder; homogenous precipitation; dispersion; spherical
