Dependence of Reduction Behavior of Ti in Molten CaCl₂ on Various Calcium Titanate

Abstract

The change in TiO₂ solubility in molten CaCl₂ at 1573 K with CaO addition was studied to clarify the influence of CaO on TiO₂ dissolution. The solubility of TiO₂ in molten CaCl₂ remarkably enlarged with CaO addition, which suggests that a titanate ion (Ti_xO_y^Z−) was preferentially formed in it. The cathodic behavior in molten CaCl₂ containing various species of calcium titanate at 1373–1573 K was investigated by cyclic voltammetry, and electrodeposition of Ti metal was attempted by potentio-static electrolysis. The reduction behavior was affected by the species of calcium titanate, and the components in the deposit changed consequently. These results indicate that the reduction behavior of Ti was strongly influenced by the species of titanate ion, and that the bath consisting of Ca₃Ti₂O₇ is found suitable.