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<p>Cr/CrAlN multilayered coatings with layer thickness <i>h</i> ranging within 20–500 nm were prepared on Zircaloy-4 and then oxidized in a 1000 °C steam environment. The oxidation resistance of coatings improved significantly with the increasing <i>h</i>, which is derived from the evolution of surface oxides from Cr<sub>2</sub>O<sub>3</sub> to α-Al<sub>2</sub>O<sub>3</sub>. Larger <i>h</i> can provide a better barrier effect for Al diffusion and help maintain a locally higher Al concentration near the surface, which is favorable for the formation of an α-Al<sub>2</sub>O<sub>3</sub> layer. The oxidation process was analyzed to deepen the understanding of the oxidation behavior in this and other similar systems.</p>

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Structure controlling strategy towards the high-temperature oxidation in multilayered coatings: an experience from Cr/CrAlN system

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月6日

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  • J. D. Zuo,
  • Y. Q. Wang,
  • Q. Y. Sun,
  • J. Y. Zhang,
  • G. Liu,
  • J. Sun

摘要

Cr/CrAlN multilayered coatings with layer thickness h ranging within 20–500 nm were prepared on Zircaloy-4 and then oxidized in a 1000 °C steam environment. The oxidation resistance of coatings improved significantly with the increasing h, which is derived from the evolution of surface oxides from Cr2O3 to α-Al2O3. Larger h can provide a better barrier effect for Al diffusion and help maintain a locally higher Al concentration near the surface, which is favorable for the formation of an α-Al2O3 layer. The oxidation process was analyzed to deepen the understanding of the oxidation behavior in this and other similar systems.