(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以Al2(SO4)3和CO(NH2)2為原料，通過均勻沉淀法制備出前驅(qū)物Al(OH)3，并煅燒得到超細(xì)α-Al2O3粉體。研究CO(NH2)2和Al2(SO4)3的摩爾比、Al2(SO4)3起始摩爾濃度、反應(yīng)溫度、反應(yīng)時間等對前驅(qū)物制備的影響。利用X射線衍射儀、掃描電鏡、熱重/差示掃描法(DTA/TGA)等多種現(xiàn)代分析檢測技術(shù)對粉體的性能進(jìn)行了表征。結(jié)果表明：在CO(NH2)2和Al2(SO4)3的摩爾比為10׃1、Al2(SO4)3起始濃度為0.05 mol/L、反應(yīng)溫度為90 ℃、反應(yīng)時間為60 min的條件下，能得到分散性能良好、粒徑為2 μm左右且粒度分布均勻的球形超細(xì)α-Al2O3粉體。
關(guān)鍵字: 超細(xì)α-Al2O3粉體；均勻沉淀法；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
