摘要
以CoCl2·6H2O为原料,采用溶液雾化氧化法制备Co3O4粉末,对反应温度、溶液浓度、载气压力等工艺条件对产物粒子形貌及粒度分布的影响进行系统研究。结果表明,反应温度对Co3O4粉末的形貌和粒度都有影响,高温下粉末粒度较小,球形度较好,但温度过高会导致粒子团聚;CoCl2·6H2O溶液的浓度对Co3O4粉末粒度也有影响,高浓度下所得Co3O4粉末的粒径较大;雾化压力增大,有利于得到颗粒分布均匀、分散性好的Co3O4粉末,但粉末粒度随之增大。在反应温度为850℃、CoCl2·6H2O溶液浓度为1.5mol/L、雾化压力为1.5×105Pa的条件下,反应较完全,可制备物相单一的Co3O4粉末,产物为均匀分布的球形粉末,且粒度分布较窄。
High quality Co3O4 powder was prepared from CoCl2·6H2O solution by spray-oxidation method. The effects of reaction temperature, concentration of aqueous CoCl2·6H2O solution as well as atomizing air pressure on the morphology and particle size distribution of Co3O4 particles were investigated systematically. The results show that the reaction temperature has effect on both the morphology and particle size distribution of Co3O4 particles. The powder with better spherical morphology and smaller particle size can be obtained at higher reaction temperature. The concentration of aqueous COCl2·6H2O also has effect on the particle size. The higher the concentration of aqueous COCl2·6H2O is, the bigger the particle size is. Increasing the atomizing air pressure is beneficial for obtaining good powder size distribution and dispersity. The optimum conditions were determined： the temperature is 850 ℃; the concentration is 1.5 mol/L; the air pressure is 1.5 ×10^5 Pa. In this condition, the pure and spherical Co3O4 powder with narrow particle size distribution can be obtained.
出处
《粉末冶金材料科学与工程》
EI
2009年第5期320-325,共6页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省科技计划重点项目(2009GK2010)
