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<p>This study investigates the effect of high-entropy oxide (HEO) powders (Cu, Mn, Ni, Co, Zn<sub><i>x</i></sub>/<i>x</i> = 0,0.1,0.2,0.3) on performance under aggressive Type I hot corrosion conditions. HEO powders synthesized by the co-precipitation method were subjected to hot corrosion tests at 800&#xa0;°C for 24&#xa0;h under a 70% Na<sub>2</sub>SO<sub>4</sub> + 30% V<sub>2</sub>O<sub>5</sub> salt mixture, representing the aggressive conditions caused by the use of low-quality fuel in aviation. The findings suggest that increasing Zn content is associated with a reduction in the stability of the initially dominant spinel phase, accompanied by a greater tendency for the formation of low-melting point vanadate phases. In particular, the presence of the Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub> phase, which exhibits a ladder-like structural motif, appears to be related to changes in the HEO crystal structure and may contribute to the development of thicker, lamellar, and irregular corrosion products on the surface. Consequently, Zn addition appears to be associated with enhanced growth of corrosion products, possibly through its influence on diffusion-related processes and structural stability.</p>

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Zn-Composition-Dependent Microstructure and Type I Hot Corrosion of (CuMnNiCoZnx)O High-Entropy Oxides

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Okan Odabas

摘要

This study investigates the effect of high-entropy oxide (HEO) powders (Cu, Mn, Ni, Co, Znx/x = 0,0.1,0.2,0.3) on performance under aggressive Type I hot corrosion conditions. HEO powders synthesized by the co-precipitation method were subjected to hot corrosion tests at 800 °C for 24 h under a 70% Na2SO4 + 30% V2O5 salt mixture, representing the aggressive conditions caused by the use of low-quality fuel in aviation. The findings suggest that increasing Zn content is associated with a reduction in the stability of the initially dominant spinel phase, accompanied by a greater tendency for the formation of low-melting point vanadate phases. In particular, the presence of the Co3V2O8 phase, which exhibits a ladder-like structural motif, appears to be related to changes in the HEO crystal structure and may contribute to the development of thicker, lamellar, and irregular corrosion products on the surface. Consequently, Zn addition appears to be associated with enhanced growth of corrosion products, possibly through its influence on diffusion-related processes and structural stability.