TiO2和Fe2O3直接电解还原制备TiFe合金  

Direct preparation of TiFe alloy by electrolytic reduction from TiO_2 and Fe_2O_3

作　　者：郭晓玲[1] 郭占成[1] 王志[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室

出　　处：《北京科技大学学报》2008年第6期620-624,共5页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(No.2007CB613504)

摘　　要：在CaCl2熔盐中,直接从TiO2和Fe2O3的混合阴极电解还原制备了TiFe合金.在1173 K和3.1 V电解条件下,电解10 h后可制得含氧量(质量分数)为0.43%的TiFe.电解过程可以大致分为两个阶段:反应初期铁优先于钛还原出来,钛元素则以CaTiO3的形式存在;随着电解的进行,电极的外层首先被还原为TiFe,同时电极出现分层现象,外层为疏松的TiFe相,内层则较为致密,主要由Fe和CaTiO3组成.由电解制备的TiFe无须活化,经电化学性能测试,放电容量为33 mA.h.g-1,优于传统方法制备的TiFe合金.TiFe alloy was prepared directly by electrolytic reduction from the mixture of TiO2 and Fe2O3 in molten CaCl2 at 1 173 K and 3.1 V. The reduced product was TiFe with an oxygen content of 0.43 % in mass fraction after electrolyzing for 10 h. The whole electrolysis process, roughly, includes two periods： the reduction of Fe element and the forming of TiFe. In the initial stage of electrolysis, Fe element is reduced first prior to titanium and CaTiO3 is formed. Then the external cathode is reduced to TiFe. Meanwhile, the cathode is layered： the external loose layer mainly contains TiFe and the inner layer, which is much harder and more compact, chiefly consists of Fe and CaTiO3. Electrochemical behavior test shows that the discharge capacity of TiFe alloy produced by electrolysis without activation is about 33 mA· h· g^- 1 and TiFe alloy by this performance is better than those prepared by other methods.

关 键 词：储氢合金 钛铁合金 电化学还原 电化学容量 

分 类 号：TF111.5[冶金工程—冶金物理化学] TG139.7[一般工业技术—材料科学与工程]