Enhancing Thermal, Oxidation and Corrosion Resistance of Ni-Fe Cermet with High Entropy Spinel Oxide Reinforcements for High-Temperature Electrolysis

A set of novel Ni-Fe based cermet with varying fractions of high entropy spinel oxide (HESO) particles were prepared via a solid-state sintering method. The effect of HESO content on the microstructure, conductivity and high-temperature oxidation and corrosion resistance was investigated. Addition of 10 ~ 30 wt.% HESO improved sintering densification and thermal insulation but reduced electrical conductivity. Compared to Ni-Fe alloy, cermet samples showed significantly reduced oxidation weight gains and lower oxidation rate constants. Addition of 20 ~ 40 wt.% HESO could improve the corrosion resistance in cryolite molten salt of the cermet, reducing void formation and erosion.

Keywords: Ni-Fe cermet, High entropy spinel oxide, Isothermal oxidation, Static corrosion, Aluminium electrolysis

Suggested Citation: Suggested Citation

He, Yong and Xiong, Hui-wen and Zhou, Kechao and Kang, Xiao and Zhang, Lei, Enhancing Thermal, Oxidation and Corrosion Resistance of Ni-Fe Cermet with High Entropy Spinel Oxide Reinforcements for High-Temperature Electrolysis. Available at SSRN: https://ssrn.com/abstract=4820793 or http://dx.doi.org/10.2139/ssrn.4820793