Direct electrochemical synthesis of zirconium carbide from zirconia/C precursors in molten calcium chloride

作者：Dai, Lei; Wang, Xianyu; Zhou, Huizhu; Yu, Yao; Zhu, Jing; Li, Yuehua; Wang, Ling^*

来源：Ceramics International, 2015, 41(3): 4182-4188.

DOI：10.1016/j.ceramint.2014.12.101

• D. Carbon
• D. ZrO2
• Zirconium carbide
• Electrochemical reduction
• CaCl2 molten salt

ZrC was successfully synthesized by direct electrolysis of non-sintering ZrO2/C mixture in molten CaCl2 electrolyte. The process of the electrochemical solid state reduction was investigated by characterizing the composition and microstructure of the products under different experimental conditions, in conjunction with analyzing the voltammetric features of initial powders in molten CaCl2. The results showed that the pure ZrC powder could be obtained by direct electrolysis of non-sintering ZrO2/C mixture in 1123 K CaCl2 melt at 3.1 V for 7 h when carbon content in mixture was over stoichiometric ratio of ZrC. Besides the role of carbon source, carbon also promoted the electrochemical reduction of ZrO2. The reaction process involved the electrochemical reduction of ZrO2 in the presence of carbon to form ZrC with CaZrO3 as intermediate.

• 出版日期2015-4
• 单位华北理工大学