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<p>To enhance the high-temperature performance of the DZ125 alloy, an Al‒Si coating was prepared by pack cementation. This study was conducted to investigate the influence of preoxidation treatment on the high-temperature oxidation behavior of an Al‒Si coating on a DZ125 alloy. The results showed that preoxidation in an Ar–25% H<sub>2</sub>O environment improved the oxidation resistance of the samples during cyclic oxidation at 1050&#xa0;°C. During cyclic oxidation, a smooth oxide scale with low oxygen permeability formed on the surface, and continuous HfO<sub>2</sub> particles formed at the interface between the oxide scale and the coating. Conversely, preoxidation in air–25% H<sub>2</sub>O resulted in a discontinuous alumina scale on the surface, with localized HfO<sub>2</sub> particles forming at the interface between the oxide scale and the coating. The mechanisms of the formation of different HfO<sub>2</sub> particles are discussed.</p>

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Influence of Preoxidation Treatment on the High-Temperature Oxidation Behavior of an Al-Si Coating on a DZ125 Alloy

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Rong Chen,
  • Ruixiong Zhai,
  • Kaiyue Lü,
  • Peng Song,
  • Taihong Huang,
  • Jianguo Lü,
  • Biju Zheng,
  • Guangliang Liu,
  • Jiansheng Lu

摘要

To enhance the high-temperature performance of the DZ125 alloy, an Al‒Si coating was prepared by pack cementation. This study was conducted to investigate the influence of preoxidation treatment on the high-temperature oxidation behavior of an Al‒Si coating on a DZ125 alloy. The results showed that preoxidation in an Ar–25% H2O environment improved the oxidation resistance of the samples during cyclic oxidation at 1050 °C. During cyclic oxidation, a smooth oxide scale with low oxygen permeability formed on the surface, and continuous HfO2 particles formed at the interface between the oxide scale and the coating. Conversely, preoxidation in air–25% H2O resulted in a discontinuous alumina scale on the surface, with localized HfO2 particles forming at the interface between the oxide scale and the coating. The mechanisms of the formation of different HfO2 particles are discussed.