混合氧化物直接电化学还原制备TiZr合金

Preparation of TiZr Alloy by Electro-Deoxidization in Molten Salt

采用电化学还原法,温度为900℃,在CaCl2熔盐中以烧结的ZrO2与TiO2混合氧化物(Ti、Zr原子比为1:1)为阴极,石墨棒为阳极,制备出了钛锆合金,初步探讨了钛锆的合金化历程。结果表明,所得合金的化学组成与投料能够保持一致,即电化学还原法由混合氧化物直接制得组分可控的TiZr合金。推断其合金化历程可能为:部分ZrO2、TiO2先钙钛矿化为CaZrO3及CaTimOn,然后还原为金属后固溶为TiZr;其余ZrO2、TiO2先形成CaZrmTinOx,然后直接还原为TiZr。

TiZr alloy was prepared by electro-deoxidization method. Using CaCl2 molten as electrolyte, sintered ZrO2 and TiO2 mixed oxides pallets as cathode, graphite rod as anode, the pallets were electrolyzed at 900 ℃ under 3.1 V for 8 h, 12 h. The mechanism of electro-deoxidization of ZrO2 and TiO2 mixed oxides was studied preliminarily. The result showed the proportion of titanium and zirconium atom of the product was the same with the ZrO2 and TiO2 mixed oxides, that was to say that content controlled TiZr alloy can be prepared from by ZrO2 and TiO2 mixed oxides electro-deoxidization in molten salt. The process of electro-deoxidization of ZrO2 and TiO2 mixed oxides in the molten salt was conducted by two kinds of mechanism： part of ZrO2 and TiO2 mixed oxides formed CaZrO, Ca4Ti3O10 firstly, then CaZrO, Ca4Ti3O10 reduced to Ti and Zr, once Ti and Zr formed, the two kinds of metal soluted each other to form solid solution. The other part of ZrO2 and TiO2 mixed oxides formed CaZrmTinOx , and then formed TiZr alloy directly.