CoCrFeNi高熵合金在金属氧化物熔盐电脱氧中的形成过程

Formation Process of CoCrFeNi High Entropy Alloy via Electro-Deoxidization of Metal Oxides in Molten Salt

摘要:

在1173 K下将金属氧化物在CaCl₂熔盐中进行电脱氧，制备了CoCrFeNi高熵合金。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线能谱（EDS）研究了不同电解时间下金属氧化物转化为高熵合金的相变过程。结果表明，CoCrFeNi高熵合金的形成过程包括快速脱氧和深度脱氧2个阶段。在快速脱氧阶段，在1 h内去除了烧结氧化物球团中93.93%（质量分数）的氧，电流效率达到89.95%。电解结束后，产物的氧含量可达0.26%（质量分数），电流效率为17.93%。该高熵合金的形成过程可用于指导建立低成本、高效率的电化学路线。

Abstract:

CoCrFeNi high entropy alloys (HEAs) were prepared by electro-deoxidization of metal oxides in CaCl₂ molten salt at 1173 K. The phase transformation from the metal oxides to HEA under different electrolysis durations was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The results show that the formation process of CoCrFeNi HEA includes two stages: the rapid deoxidization stage and deep deoxidization stage. In the rapid deoxidization stage, 93.93wt% oxygen in sintered oxide pellet is removed within 1 h and the current efficiency reaches 89.95%. After electrolysis of 15 h, the oxygen content of the product is 0.26wt% and the current efficiency is 17.93%. The formation process of CoCrFeNi HEA provides guidance for establishing the electrochemical route with low cost and high efficiency.