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<p>Oxidation behavior of NiCrAlY nanocrystalline coatings with different Cr contents at 1050 and 1150&#xa0;°C is investigated. The results indicate that Al<sub>2</sub>O<sub>3</sub> scales can be formed on NiCrAlY nanocrystalline coatings after oxidation at high temperature. And their formation and thickening cannot be affected by the change of Cr contents in NiCrAlY coatings. During service, Cr in the coating can affect the microstructure of Ni-based single crystal superalloy. At 1050&#xa0;°C, Cr in the coating can diffuse into the superalloy, destroy its microstructure, and lead to the formation of interdiffusion zone and the precipitation of needle-like topologically closed-packed phase. The higher the Cr content in NiCrAlY the coating is, the more obvious the phenomenon is. However, after oxidation at 1150&#xa0;°C for 100&#xa0;h, no obvious changes were observed&#xa0;in the microstructure of CMSX-4 single crystal superalloy beneath the three kinds of NiCrAlY nanocrystalline coatings.</p>

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Oxidation behavior of NiCrAlY nanocrystalline coatings at 1050 and 1150 °C

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Zhao-hui Zhou,
  • Lan-lan Yang,
  • Yuan-fang Wang,
  • Shao-yu Feng,
  • Jie Li,
  • Jin-long Wang,
  • Sheng-long Zhu,
  • Fu-hui Wang

摘要

Oxidation behavior of NiCrAlY nanocrystalline coatings with different Cr contents at 1050 and 1150 °C is investigated. The results indicate that Al2O3 scales can be formed on NiCrAlY nanocrystalline coatings after oxidation at high temperature. And their formation and thickening cannot be affected by the change of Cr contents in NiCrAlY coatings. During service, Cr in the coating can affect the microstructure of Ni-based single crystal superalloy. At 1050 °C, Cr in the coating can diffuse into the superalloy, destroy its microstructure, and lead to the formation of interdiffusion zone and the precipitation of needle-like topologically closed-packed phase. The higher the Cr content in NiCrAlY the coating is, the more obvious the phenomenon is. However, after oxidation at 1150 °C for 100 h, no obvious changes were observed in the microstructure of CMSX-4 single crystal superalloy beneath the three kinds of NiCrAlY nanocrystalline coatings.