在CaCl2熔盐中采用熔盐电解法由阴极的混合氧化物制备组分可控的TiFe合金。初步探讨了TiFe合金的形成机制,研究了电解时间对电解产物的影响。结果表明,混合氧化物的还原经历了从优先生成铁到逐步形成TiFe2、TiFe的合金化历程,中间产物包括CaTiO3、Fe:TiO4、TiO,电解过程中没有金属钛出现。扩散是混合氧化物熔盐电解反应的控制步骤。
TiFe alloy was prepared by electro-deoxidization method. Using CaCI2 molten as electrolyte, sintered Fe2O3 and TiO2 mixed oxides pallets as cathode, graphite rod as anode, electrolysis was performed at 900 ℃. The mechanism of electro-deoxidization of Fe2O3 and TiO2 mixed oxides was studied preliminarily. The result showed the proportion of titanium and iron atom in the product was the same as that in Fe2O3 and TiO2 mixed oxides, that is to say that TiFe alloy can be prepared by Fe2O3 and TiO2 mixed oxides eleetro-deoxidization in Molten Salt. The process of electro-deoxidization of Fe2O3 and TiO2 mixed oxides in molten salt was indicate: first deoxidize product is iron, then TiFe2 and TiFe alloy, intermediate products include CaTiO3, Fe2TiO4 and TiO et al. The key step of electrolysis is diffusion.