Electrolytic reduction of mixed solid oxides in molten salts for energy efficient production of the TiNi alloy  

作　　者：ZHU Yong MA Meng WANG Dihua JIANG Kai HU Xiaohong JIN Xianbo George Z. CHEN 

机构地区：[1]College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China [2]School of Chemical, Environmental and Mining Engineering, Univer- sity of Nottingham, University Park, Nottingham NG7 2RD, UK

出　　处：《Chinese Science Bulletin》2006年第20期2535-2540,共6页

基　　金：the National Natural Science Foundation of China （Grant Nos 20125308 and 20573081）.

摘　　要：Direct electrochemical reduction of mixed TiO2 and NiO powders to TiNi alloy has been successfully demonstrated in molten CaCl2 at 900℃ by constant voltage electrolysis. The electrolysis en- ergy consumption was as low as 23.4 kWh/kg-TiNi, although the current efficiency was 20.5% in the pre- liminary experiments. During the process, NiO was first reduced to Ni at high speed, accompanied by TiO2 being perovskitized to CaTiO3?x which was gradually reduced to Ni3Ti and TiNi, assisted by the depolarization of the preformed Ni. The cell voltage for preparation of the TiNi alloy was lower than that for Ti. Adjusting the cell voltage not only affected the reduction speed, but also offered a convenient ac- cess to the preparation of the nickel/perovskite composite.Direct electrochemical reduction of mixed TiO2 and NiO powders to TiNi alloy has been successfully demonstrated in molten CaCl2 at 900℃ by constant voltage electrolysis. The electrolysis energy consumption was as low as 23.4 kWh/kg-TiNi, although the current efficiency was 20.5% in the preliminary experiments. During the process, NiO was first reduced to Ni at high speed, accompanied by TiO2 being perovskitized to CaTiO3-x which was gradually reduced to Ni3Ti and TiNi, assisted by the depolarization of the preformed Ni. The cell voltage for preparation of the TiNi alloy was lower than that for Ti. Adjusting the cell voltage not only affected the reduction speed, but also offered a convenient access to the preparation of the nickel/perovskite composite.

关 键 词：熔盐电解 电解还原 钛镍合金 节能 

分 类 号：TF823[冶金工程—有色金属冶金]