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CaCl2熔鹽中自燒結(jié)電解制備粉體Cr3C2及其機(jī)制
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Preparation and Reaction Mechanism of Cr3C2 by Electrochemical Reduction of the Cathode Self-Sintered in Molten CaCl2 Salt
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    摘要:

    以氧化鉻和石墨粉為原料，采用聚乙烯醇粘接，壓制成陰極片，以光譜石墨棒為陽極，在800 ℃氯化鈣熔鹽中，恒電壓3.2 V下，陰極片自燒結(jié)電解制備碳化鉻。采用XRD、SEM和EDX對樣品進(jìn)行表征。結(jié)果表明：粘接的陰極片滿足熔鹽電解的強(qiáng)度要求，通過熔鹽電解過程的自燒結(jié)陰極片有效地粘接在一起，并制備出具有良好燒結(jié)性能、組分單一的Cr3C2粉體。該法制備Cr3C2的電流效率不低于37.3%。采用恒電位電解法和循環(huán)伏安法對電解機(jī)制的研究表明，熔鹽電解制備Cr3C2的反應(yīng)機(jī)制為：Cr2O3 + e- →Cr+ O2-, Cr+C→Cr3C2兩步完成

    Abstract:

    The Cr2O3 and C powder with polyvinyl alcohol were mixed and pressed to form the pellets. The pellets of the Cr2O3-C mixtures were self-sintered and directly electrochemically reduced to Cr3C2 at the same time in molten CaCl2 at 800 oC and 3.2 V with a graphite anode. The samples were characterized by XRD, SEM, and EDX. The results show that the Cr2O3-C mixtures satisfy the bond strength requirement when electrolyzing. High purity Cr3C2 powder with the excellent sintering nature is obtained. The current efficiency is no less than 37.3%. The results of the cyclic voltammetry measurement and the potentiostatic electrolysis reveal that the reaction mechanism of Cr3C2 formation by the directly electrochemical reduction is two steps: Cr2O3+e-→Cr + O2 and Cr+C→Cr3C2.

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郎曉川,謝宏偉,翟玉春,鄒祥宇. CaCl2熔鹽中自燒結(jié)電解制備粉體Cr3C2及其機(jī)制[J].稀有金屬材料與工程,2013,42(9):1926~1930.[Lang Xiaochuan, Xie Hongwei, Zhai Yuchun, Zou Xiangyu. Preparation and Reaction Mechanism of Cr3C2 by Electrochemical Reduction of the Cathode Self-Sintered in Molten CaCl2 Salt[J]. Rare Metal Materials and Engineering,2013,42(9):1926~1930.]
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  • 收稿日期:2012-11-23
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