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均匀沉淀法制备球形Co-Y2O3复合粉末

ISSN号：1673-0224
期刊名称：《粉末冶金材料科学与工程》
时间：0
分类：TF123.73[冶金工程—粉末冶金;冶金工程—冶金物理化学]
作者机构：[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
相关基金：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）

作者：覃德清[1], 唐建成[1], 叶楠[1], 卓海鸥[1], 师晓燕[1], 陆娟[2]

关键词：均匀沉淀法, Co-Y2O3复合粉末, 形貌, homogeneous precipitation, Co-Y2O3 composite powders, morphology

中文摘要：

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。

英文摘要：

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.

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