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ZrO2 phase formed in conventional oxidation environment has poor stability and cannot effectively protect Zr alloys. In this work, ZrO2 coating with special structure was prepared on Zr alloy, and the defects’ structure was introduced by Ar8+ bombardment. Martensitic phase transitions were found in ZrO2 coatings, which were caused by lattice distortion and gradient mismatch at the interface. In addition, Ar8+ bombardment induces the formation of interstitial-vacancy pairs in ZrO2. The DFT model proves that this irradiated vacancy has an advantage in stabilizing T-phase ZrO2 compared to natural oxygen vacancy. A corrosion resistance mechanism based on unique interface and defect state was proposed.

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“Irradiation–Oxidation” Correlation and Phase Stabilization Mechanism of Zirconia Coating

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  • 发表日期：

    2025年

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  • Junhua Hu,
  • Guoqin Cao

摘要

ZrO2 phase formed in conventional oxidation environment has poor stability and cannot effectively protect Zr alloys. In this work, ZrO2 coating with special structure was prepared on Zr alloy, and the defects’ structure was introduced by Ar8+ bombardment. Martensitic phase transitions were found in ZrO2 coatings, which were caused by lattice distortion and gradient mismatch at the interface. In addition, Ar8+ bombardment induces the formation of interstitial-vacancy pairs in ZrO2. The DFT model proves that this irradiated vacancy has an advantage in stabilizing T-phase ZrO2 compared to natural oxygen vacancy. A corrosion resistance mechanism based on unique interface and defect state was proposed.