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中文摘要：
为了制备球形颗粒的Co粉和实现在Co粉中添加Y_2O_3的目的,分析了共沉淀法制备Co-Y_2O_3复合粉前驱体的热力学。通过对Co^2＋-Y^3＋-NH_3-C_2O_4^2--H_2O沉淀体系的热力学分析,得到了lg[M]T-p H关系图（M为金属元素）。热力学分析表明：增加草酸根总浓度[C]T和铵根总浓度[N]T会促进Co^2＋离子的络合,而Yz^3＋离子只受草酸根总浓度[C]T的影响,随着[C]T的升高Y^3＋离子沉淀率下降。Co^2＋离子和Y^3＋离子沉淀的最佳p H值分别为2-2.5和1.5-2.5。当p H值为2.5时,由共沉淀法制备出簇球状Co-Y_2O_3前驱体,经煅烧和还原后得到球形Co-Y_2O_3复合粉,其颗粒尺寸约为5μm。
英文摘要：
In order to prepare spherical particles of cobalt powders and to add Y_2O_3 into cobalt powders,the thermodynamics of the precursor of Co-Y_2O_3 composite powders by coprecipitation was analyzed.The lg[M]T-p H diagram was obtained by analyzing the thermodynamics of Co^2＋-Y^3＋-NH_3-C_2O_4^2--H_2 O precipitation system.It is shown that the complexation of Co^2＋ ions is promoted by increasing the total concentration of oxalic acid root [C]T and ammonium root [N]T.The precipitation rate of Y^3＋ ion is only influenced by the total concentration of oxalic acid root [C]T,which declines with the increase of [C]T.The optimum p H values for the precipitation of Co^2＋ and Y^3＋ are 2-2.5 and 1.5-2.5,respectively.The precursor of Co-Y_2O_3 composite powders was prepared by coprecipitation with the p H value of 2.5.The shape of the precursor composite powders is cluster ball with good dispersion.The spherical Co-Y_2O_3 composite powders with uniform size distribution are obtained whose mean particle size is about 5 μm.
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