Direct Synthesis of TiCr₂ Powder by Calciothermic Co-reduction of their Oxides in Molten CaCl₂

抄録

A new process is studied to synthesize an intermetallic compound TiCr₂ directly from the oxide mixture of Cr₂O₃ and TiO₂. This method combines the calciothermic co-reduction and the in situ dissolution of the by-product CaO into the molten salt. The molten CaCl₂ was needed to dissolve CaO for complete reaction, and the reduction and alloying occurred simultaneously and quickly in this media. Because of the narrow compositional range of TiCr₂, however, a small amount of Ti and Cr coexisted with α-TiCr₂. The high temperature form, β-TiCr₂, was not found probably because it decomposed into α-TiCr₂ and Cr during cooling. The obtained alloy powder showed capability of hydrogen storage after activation.