Preparation Of TiC By Salt Electrochemistry Deoxy Method

Titanium carbide has been widely used because of its excellent performance. However, It must be prepared through the high temperature, high energy consumption and other restricted conditions.In the recent decade, FFC method was rapidly developed as its green low-carbon performance and short metallurgical process. It based on in molten salt medium, graphite as anode and directly electrochemical reduction of oxides to form the solid metal and its alloys and metal carbides by applying under molten salt decomposition voltage. It also exist some problems such as cathode oxides need to sinter at high-temperature, which resulted in high energy consumption, and electrolysis rate low.Sodium hydroxide can react with oxides at low temperature, and products are low melting point sodium salt, which are the excellent adhesive. Therefore, the present direct ly used the sodium hydroxide and sodium titanate to change the TiO2-C sintering process in order to reduce energy consumption, simple the process, improve the efficiency of the current rate and increase the electrolysis rate.5w%NaOH was added as reactants and different content of sodium titanate was added as sintering modifier, and cathode was tableted at4MPa pressure and sintered at the temperature of400℃under the protection of argon conditions. Product samples were characterized by XRD, SEM and EDS. Results showed that TiO2reacted with sodium hydroxide to form sodium titanate, sodium titanate transfered into CaTiO3completely after1h soaking in molten CaCl2. The cathode reaction mechanism was that firstly, titanium element in the TiO2and CaTiO3was deoxidized to convert to low valence oxides, and finally converted to Ti, then the metallic Ti reacted with carbon black rapidly and devoted about5μm grain of TiC. The added sodium titanate improves the cathode current efficiency and the electrolytic rate, and with the increasing content of sodium titanate, the rate of the electrolysis and current efficiency were improved, and the current efficiencies was up to89.46%, and the appropriate electrolysis temperature ranges from800℃to850℃.