Abstract

TiC/SiC composites were successfully prepared from Ti-enriched slag via an electro-deoxidization process in molten CaCl2–NaCl eutectic melt at 700°C in argon. Electrolysis was conducted at an applied voltage of 3.2V using a graphite anode and a composite cathode composed of graphite powder and Ti-enriched slag. According to the results, a possible reaction pathway was suggested: firstly the complex Ti-compounds were decomposed into TiO2-based simple oxides; then a mass of CaTiO3 and a spot of CaSiO3 formed accompanied by the reduction of titanium dioxide to titanium sub-oxide such as TiO, Ti2O; finally the graphite powder involved in the formation of SiC, TiC1−xOx, which were further converted into SiC and TiC by prolonging electrolysis.

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