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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium High Temperature Electrochemistry III
Presentation Title Electrochemical Synthesis of TaC in Molten Salt
Author(s) Xin Li, Xingli Zou, Shangshu Li, Kai Zheng, Yinshuai Wang, Qian Xu, Xionggang Lu
On-Site Speaker (Planned) Xin Li
Abstract Scope TaC has been successfully synthesized from Ta2O5/C through electrodeoxidation process in molten CaCl2 at 1000 C and 4.0 V. The electrolysis process utilized a pressed porous Ta2O5/C pellet mixture as the cathode, and a solid-oxygen-ion-conducting membrane (SOM) tube filled with carbon-saturated liquid tin/copper was served as the anode to control the electrodeoxidation process. The obtained cathodic product was analyzed by using X-ray diffraction (XRD) and scanning election microscopy (SEM). The result shows that the possible synthesis pathway can be summarized as the following: (1) CaαTa2βO(α+5β) compounds were firstly formed due to the compounding process (αCaO + βTa2O5 = CaαTa2βO(α+5β)), (2) the generated intermediate compounds would be reduced to Ta through electroreduction process (CaαTa2βO(α+5β) + 10βe- = 2βTa + 5βO2-+ αCaO), (3) the generated Ta reacted with C to form TaC carbide via carbonization process (Ta + C = TaC). Keywords: TaC; electrodeoxidation; molten CaCl2; SOM
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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