熔盐电化学合成NbC-Sn复合粉末（英文）

发布时间：2018-07-08 15:44

本文选题：NbC-Sn + 电化学还原　；参考：《Transactions of Nonferrous Metals Society of China》2017年10期

【摘要】：研究在900°C的CaCl_2-Na Cl熔融盐体系中,以SnO_2、Nb_2O_5和碳粉为前驱体,使用电化学还原和原位碳化的方法,成功制备出NbC-Sn复合粉体材料。通过对不同反应阶段的产物进行分析,研究反应过程机理。考察前驱体中碳粉物质的量变化对最终产物的影响,并通过酸浸NbC-Sn粉体的方式制备NbC。研究表明通过该方法制备出尺寸分别为50～100 nm和200 nm的NbC和Sn颗粒,两者紧密地聚集在一起。SnO_2在烧结过程中被碳还原为金属Sn,Nb_2O_5在熔盐中被逐步电化学还原为金属Nb,并与碳反应生成NbC。其中,历经了铌酸盐的形成与分解、低价铌氧化物的形成与进一步还原等过程。当阴极片中的碳不足时,会造成铌氧化物还原不完全并形成Nb_3Sn。复合粉体材料通过HCl水溶液浸出,能够获得分散性很好的NbC粉体材料。
[Abstract]:NbC-Sn composite powders were successfully prepared by electrochemical reduction and in-situ carbonization with SnO2Nb2O5 and carbon powder as precursors in the CaCl _ 2-Na _ Cl molten salt system at 900 掳C. The reaction mechanism was studied by analyzing the products of different reaction stages. The influence of the amount of carbon powder in the precursor on the final product was investigated, and NbC was prepared by acid leaching of NbC-Sn powder. The results showed that NbC and Sn particles with sizes of 50nm and 200nm were prepared by this method. Both of them were closely clustered together. SnOStack2 was reduced by carbon to metal SnS / Nb2O5 in the sintering process, which was gradually electrochemical reduced to metal NB in molten salt and reacted with carbon to form NbC. Among them, the formation and decomposition of niobate, the formation and further reduction of low-valent niobium oxide. When the carbon in the cathode chip is insufficient, the reduction of niobium oxide is incomplete and the NB _ 3SnS is formed. NbC powder materials with good dispersity can be obtained by leaching the composite powders by HCl aqueous solution.
【作者单位】：东北大学冶金学院;东北大学辽宁省冶金传感器及技术重点实验室;上海大学省部共建高品质特殊钢冶金与制备国家重点实验室材料科学与工程学院;
【基金】：Projects(51404057,50874026)supported by the National Natural Science Foundation of China Project(N150204014)supported by Fundamental Research Funds for the Central Universities,China
【分类号】：TF123.2

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