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<p>This paper focuses on studying the high-temperature oxidation behavior of Co-20Re-25Cr-3Si alloy under two oxygen pressures, namely 0.1&#xa0;MPa pure O<sub>2</sub> and 3.0 × 10<sup>−5</sup>&#xa0;Pa O<sub>2</sub>. The results show that the oxidation kinetics curve under 0.1&#xa0;MPa pure O<sub>2</sub> condition is not regular, but the oxidation kinetics curve under 3.0 × 10<sup>−5</sup>&#xa0;Pa O<sub>2</sub> condition conforms to the parabolic law. SEM shows that the oxide scale under pure oxygen conditions mainly consists of three layers, from the inside to the outside; they are CoO oxide, CoO + CoCr<sub>2</sub>O<sub>4</sub> mixed oxide, and Cr<sub>2</sub>O<sub>3</sub> oxide, respectively. However, under low oxygen pressure condition, the oxide scale is almost only one layer, which is Cr<sub>2</sub>O<sub>3</sub> oxide. This indicates that the low oxygen pressure environment inhibits the growth of CoO oxides, promotes the rapid growth of Cr<sub>2</sub>O<sub>3</sub> oxide, and ultimately enhances the high-temperature oxidation resistance of Co-20Re-25Cr-3Si alloy.</p>

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Impact of Varying Oxygen Pressures on the High-Temperature Oxidation Behavior of Co-20Re-25Cr-3Si Alloy

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Xunhu Xu,
  • Junhuai Xiang,
  • Yongkang Liu,
  • Zhenlun Li,
  • Guofeng Wang,
  • Honghua Zhang

摘要

This paper focuses on studying the high-temperature oxidation behavior of Co-20Re-25Cr-3Si alloy under two oxygen pressures, namely 0.1 MPa pure O2 and 3.0 × 10−5 Pa O2. The results show that the oxidation kinetics curve under 0.1 MPa pure O2 condition is not regular, but the oxidation kinetics curve under 3.0 × 10−5 Pa O2 condition conforms to the parabolic law. SEM shows that the oxide scale under pure oxygen conditions mainly consists of three layers, from the inside to the outside; they are CoO oxide, CoO + CoCr2O4 mixed oxide, and Cr2O3 oxide, respectively. However, under low oxygen pressure condition, the oxide scale is almost only one layer, which is Cr2O3 oxide. This indicates that the low oxygen pressure environment inhibits the growth of CoO oxides, promotes the rapid growth of Cr2O3 oxide, and ultimately enhances the high-temperature oxidation resistance of Co-20Re-25Cr-3Si alloy.