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首页> 外文期刊>Journal of Materials Research >Using electro-deoxidation to synthesize niobium sponge from solid Nb_2O_5 in alkali―alkaline-earth metal chloride melts
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Using electro-deoxidation to synthesize niobium sponge from solid Nb_2O_5 in alkali―alkaline-earth metal chloride melts

机译：用电脱氧从碱金属-碱土金属氯化物熔体中的固体Nb_2O_5合成铌海绵

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摘要

The method of electro-deoxidation was applied to reduce solid Nb_2O_5 directly to niobium metal, in the form of sponge, in the eutectic CaCl_2―NaCl and BaCl_2―NaCl systems, respectively. The direct electrochemical reduction of solid Nb_2O_5 was achieved by electrolysis in the chloride melts at temperatures between 850 and 950℃ and at a controlled potential of 3.1 V, well below the decomposition potentials of the melts used. The obtained results demonstrated that the method is applicable for preparing niobium sponges directly from solid Nb_2O_5 under the present experimental conditions. The niobium sponge prepared was proven to possess as remarkable superconducting properties. The parameters affecting the rate and the extent of electro-deoxidation were investigated experimentally, including initial particle sizes of the starting Nb_2O_5 powders, compaction pressure, sintering temperature and times, electrolysis temperature and duration, and electrolyte systems. The mechanism by which the Nb_2O_5 pellets were electro-deoxidized to the niobium sponges was also discussed on the basis of the present experimental observations.
机译：在共晶CaCl_2〜NaCl和BaCl_2〜NaCl体系中，采用电脱氧法将固体Nb_2O_5直接还原为海绵状的铌金属。固体Nb_2O_5的直接电化学还原是通过在850至950℃之间的温度和3.1 V的受控电势下在氯化物熔体中进行电解实现的，远低于所用熔体的分解电位。所得结果表明，该方法适用于在当前实验条件下直接由固体Nb_2O_5制备铌海绵。事实证明，制备的铌海绵具有卓越的超导性能。实验研究了影响电脱氧速率和程度的参数，包括起始Nb_2O_5粉末的初始粒径，压实压力，烧结温度和时间，电解温度和持续时间以及电解质体系。在目前的实验观察的基础上，还讨论了将Nb_2O_5球团电还原为铌海绵的机理。

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  • 来源
    《Journal of Materials Research》 |2003年第2期|p.346-356|共11页
  • 作者

    X.Y. Yan; D.J. Fray;

  • 作者单位

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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