Electrochemical synthesis of Nb C-Sn composite powder in molten chloride  

熔盐电化学合成NbC-Sn复合粉末（英文）

作　　者：Hong-mei LI Qiu-shi SONG Qian XU Ying CHEN Jing-chun MENG 李红梅;宋秋实;许茜;陈莹;孟靖淳(东北大学冶金学院,沈阳110819;东北大学辽宁省冶金传感器及技术重点实验室,沈阳110819;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,上海200072)

机构地区：[1]School of Metallurgy, Northeastern University, Shenyang 110819, China [2]Liaoning Key Laboratory for Metallurgical Sensor and Technology,Northeastern University, Shenyang 110819, China [3]State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering,Shanghai University, Shanghai 200072, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第10期2310-2316,共7页中国有色金属学报（英文版）

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

摘　　要：NbC-Sn composite powder was successfully prepared from SnO2,Nb2O5and carbon by electrochemical reduction andcarbonization in CaCl2-NaCl molten salt at900°C.The reaction pathway was investigated by terminating electrochemicalexperiments for various durations.The influence of carbon on the final products was considered.NbC particles were obtained byleaching the composite with acid.The results showed that the aggregated NbC-Sn composite powdev contained NbC particles about50-100nm and Sn particles about200nm.SnO2was reduced to Sn in the sintering process.Nb2O5was electrochemically reduced toNb in molten salt,experiencing some intermediate products of calcium niobates and niobium suboxides.Nb metal obtained wasconverted to NbC with assistance of carbon.The reduction of Nb oxides may be incomplete and Nb3Sn would be formed if carbon isinsufficient in the cathodic pellet.NbC with good dispersity is produced by leaching NbC-Sn with HCl.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。

关 键 词：NbC-Sn electrochemical reduction molten chloride calcium niobates acid leaching 

分 类 号：TF123.2[冶金工程—粉末冶金]