均匀沉淀法制备球形Co-Y_2O_3复合粉末  

Preparation of spherical Co-Y_2O_3 composite powders by homogeneous precipitation

作　　者：覃德清[1] 唐建成[1] 叶楠[1] 卓海鸥[1] 师晓燕[1] 陆娟 

机构地区：[1]南昌大学材料科学与工程学院,南昌330031 [2]上海通用五菱汽车股份有限公司,柳州545007

出　　处：《粉末冶金材料科学与工程》2014年第3期433-438,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(50801037;51071082;51271090;51364036);教育部博士学科点专项基金资助项目(20103601110001);教育部长江学者和创新团队发展计划资助项目(IRT0730);教育部新世纪优秀人才支持计划资助项目(NECT-10-0184);江西省高等学校科技落地计划资助项目(12056)

摘　　要：以钴粉、氧化钇和草酸铵为原料,采用均匀沉淀法制备Co-Y2O3的前驱体,经氢还原后得到Co-Y2O3复合粉末,研究反应溶液中CoCl2浓度、YCl3与CoCl2的物质的量比n(YCl3)/n(CoCl2)以及表面活性剂对Co-Y2O3复合粉末形貌和粒度的影响。结果表明:YCl3与CoCl2的物质的量比以及表面活性剂对Co-Y2O3复合粉的形貌都有很大影响。当n(YCl3)/n(CoCl2)的值由0增加到0.014时,复合粉形貌由棒状转变为梅花状;当n(YCl3)/n(CoCl2)进一步增大到0.040和0.078时,复合粉分别为絮状和粗棒状;向n(YCl3)/n(CoCl2)为0.014的混合溶液中加入十二烷基硫酸钠时,复合粉末形貌由梅花形转变为球形。CoCl2的浓度c(CoCl2)对复合粉末粒度和分散性有较大影响。随c(CoCl2)从0.2 mol/L增加到0.5 mol/L,复合粉末的平均粒度由7μm减小到4μm,并且粉末的分散性更好;当c(CoCl2)增加到0.8 mol/L时,粉末的平均粒度增大到10μm,粉末的分散性变差。Co-Y2O3 composite powder precursors were prepared by homogeneous precipitation with cobalt powder, yttria and ammonium oxalate as raw materials, and then Co-Y2O3 composite powders were prepared by hydrogen reduction. The effects of the concentration of cobalt chloride, YCl3/CoCl2 molar ratio, and surfactant on the mean particle size and morphology of composite powders were studied. It is shown that the YCl3/CoCl2 molar ratio and surfactant have great effects on the morphology of composite powders. The morphology of composite powders changes from rod-like shape to plum blossom-like shape when the YCl3/CoCl2 molar ratio increases from 0 to 0.014. When the YCl3/CoCl2 molar ratio reaches 0.040 and 0.078, the composite powders are floc-like shape and thick stick shape, respectively. The morphology of composite powders changes from plum blossom-like shape to sphericity while adding the sodium dodecyl sulfate to the mixed solution, whose YCl3/CoCl2 molar ratio is 0.014. The concentration of cobalt chloride has a great effect on the mean particle size and dispersibility of composite powders. With the increasing of concentration of cobalt chloride from 0.2 mol/L to 0.5 mol/L, the mean particle size of composite powders reduce from 7 μm to 4 μm, and the dispersibility of composite powders are improved. When the concentration of cobalt chloride reaches 0.8 mol/L, the mean particle size of composite powders increase to 10 μm, and the dispersibility becomes worse.

关 键 词：均匀沉淀法 Co-Y2O3复合粉末 形貌 

分 类 号：TF123.73[冶金工程—粉末冶金]