CAJ | 학술논문

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。
이고분、양화을화초산안위원료，채용균균침정법제비Co-Y2O3적전구체，경경환원후득도Co-Y2O3복합분말，연구반응용액중 CoCl2농도、YCl3여 CoCl2적물질적량비 n(YCl3)/n(CoCl2)이급표면활성제대 Co-Y2O3복합분말형모화립도적영향。결과표명：YCl3여CoCl2적물질적량비이급표면활성제대Co-Y2O3복합분적형모도유흔대영향。당n(YCl3)/n(CoCl2)적치유0증가도0.014시，복합분형모유봉상전변위매화상；당n(YCl3)/n(CoCl2)진일보증대도0.040화0.078시，복합분분별위서상화조봉상；향n(YCl3)/n(CoCl2)위0.014적혼합용액중가입십이완기류산납시，복합분말형모유매화형전변위구형。CoCl2적농도 c(CoCl2)대복합분말립도화분산성유교대영향。수c(CoCl2)종0.2 mol/L증가도0.5 mol/L，복합분말적평균립도유7μm감소도4μm，병차분말적분산성경호；당c(CoCl2)증가도0.8 mol/L시，분말적평균립도증대도10μm，분말적분산성변차。
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.