Enhanced thermal insulation and corrosion resistance in Ni-Fe cermet through incorporation of high-entropy spinel oxides

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2024-10-05 DOI:10.1016/j.corsci.2024.112505

Yong He, Hui-wen Xiong, Ke-chao Zhou, Xiao Kang, Lei Zhang

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Abstract

The influence of high-entropy spinel oxide (HESO) content on the microstructure, electrical conductivity, and high-temperature corrosion resistance of HESO/NiFe cermets were investigated. The results found that the addition of 10–30 wt% HESO enhanced sintering densification and thermal insulation, although it also resulted in reduced electrical conductivity. Isothermal oxidation tests conducted at 900 °C for 10 hours revealed that cermets containing 30–50 wt% HESO exhibited significantly lower weight gains (0.954–1.167 mg cm⁻²) and oxidation rate constants (0.1057–0.1525 mg² cm⁻⁴ h⁻¹). Furthermore, static corrosion tests in AlF₃-KF-Al₂O₃ molten salt demonstrated that HESO effectively mitigated the erosion of the metallic phase by the fluoride molten salt. This study holds significant potential by providing new insights for the design of inert anodes for aluminum electrolysis and exploring the practical applications of high-entropy oxide materials.

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通过加入高熵尖晶石氧化物增强镍铁合金的隔热性和耐腐蚀性

研究了高熵尖晶石氧化物（HESO）含量对 HESO/NiFe 金属陶瓷的微观结构、导电性和耐高温腐蚀性的影响。结果发现，添加 10-30 wt% 的 HESO 可提高烧结致密性和隔热性，但同时也会降低导电性。在 900 °C 下进行 10 小时的等温氧化测试表明，含有 30-50 wt% HESO 的铁锰铁合金的增重（0.954-1.167 mg cm-²）和氧化速率常数（0.1057-0.1525 mg² cm-⁴ h-¹）明显较低。此外，在 AlF₃-KF-Al₂O₃熔盐中进行的静态腐蚀测试表明，HESO 能有效减轻氟化熔盐对金属相的侵蚀。这项研究为铝电解惰性阳极的设计提供了新的见解，并探索了高熵氧化物材料的实际应用，具有重大潜力。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.