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共沉淀法制備Co-Y2O3復(fù)合粉的熱力學(xué)分析
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南昌大學(xué),南昌大學(xué)

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TF123

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）;國家教育部博士點基金


Thermodynamic Analysis of Co-Y2O3 Composite Powders Prepared by Coprecipitation Method
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Nanchang University,Nanchang University

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    摘要:

    為了制備球形顆粒的Co粉和實現(xiàn)在Co粉中添加Y2O3的目的，分析了共沉淀法制備Co-Y2O3復(fù)合粉前驅(qū)體的熱力學(xué)。通過對Co2 -Y3 -NH3-C2O42--H2O沉淀體系的熱力學(xué)分析，得到了lg[M]T－pH關(guān)系圖(M為金屬元素)。熱力學(xué)分析表明：增加草酸根總濃度[C]T和銨根總濃度[N]T會促進Co2 離子的絡(luò)合，而Y3 離子只受草酸根總濃度[C]T的影響，隨著[C]T的升高Y3 離子沉淀率下降。Co2 離子和Y3 離子沉淀的最佳pH值分別為2～2.5和1.5～2.5。當(dāng)pH值為2.5時，由共沉淀法制備出簇球狀Co-Y2O3前驅(qū)體，經(jīng)煅燒和還原后得到球形Co-Y2O3復(fù)合粉，其顆粒尺寸約為5μm。

    Abstract:

    In order to prepare spherical particles of cobalt powders and add Y2O3 into cobalt powders, the preparation thermodynamic of the precursor of Co-Y2O3 composite powders by coprecipitation was analyzed. The lg[M]T-pH diagram was obtained by analyzing the thermodynamics of Co2 -Y3 -NH3-C2O42--H2O precipitation system. It is shown that the complexation of Co2 ions is promoted by increasing the total concentration of oxalic acid root [C]T and ammonium root [N]T could. The precipitation rate of Y3 ion is only influenced by the total concentration of oxalic acid root [C]T and declines with its increase. The optimum pH values for the precipitation of Co2 and Y3 are 2~2.5 and 1.5~2.5, respectively. The precursor of Co-Y2O3 composite powders was prepared by coprecipitation with the pH value of 2.5. The shape of the precursor composite powders is cluster ball with good dispersion. The spherical Co-Y2O3 composite powders with uniform size distribution and the mean particle size of about 5 μm were obtained.

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覃德清,唐建成.共沉淀法制備Co-Y2O3復(fù)合粉的熱力學(xué)分析[J].稀有金屬材料與工程,2016,45(7):1881~1886.[qindeqing, Tang Jiancheng. Thermodynamic Analysis of Co-Y2O3 Composite Powders Prepared by Coprecipitation Method[J]. Rare Metal Materials and Engineering,2016,45(7):1881~1886.]
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  • 收稿日期:2014-06-13
  • 最后修改日期:2014-07-30
  • 錄用日期:2014-12-25
  • 在線發(fā)布日期: 2016-10-09
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