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<p>The existing metal bond coat is struggling with increasing demand for high thermal barrier coatings. To address this issue, multilayer graphene (Gr) was added as a reinforcement to NiAl bond coat. NiAl-based coatings with 0%, 0.6%, and 6% Gr were prepared via high-velocity oxygen fuel (HVOF), and their oxidation behaviors at 1050&#xa0;°C were investigated. The results show that the addition of Gr apparently improves the high-temperature oxidation resistance of the NiAl coating. Mixed oxides of steady-state α-Al<sub>2</sub>O<sub>3</sub> and metastable θ-Al<sub>2</sub>O<sub>3</sub> form on the NiAl coating, while nearly pure α-Al<sub>2</sub>O<sub>3</sub> is exhibited on the NiAl-0.6Gr and NiAl-6Gr coatings. The excellent oxidation resistance of the NiAl-0.6Gr coating is attributed to the dense protective α-Al<sub>2</sub>O<sub>3</sub> layer formed by selective oxidation and the reduced agglomeration of Gr due to its appropriate content.</p>

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Effect of Graphene on High-Temperature Oxidation Behavior and Mechanism of NiAl Bond Coat

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Yixin Li,
  • Zihang Li,
  • Jiayi Peng,
  • Juncheng Wang,
  • Zi Wang,
  • Yan Wang,
  • Liming Tan,
  • Feng Liu

摘要

The existing metal bond coat is struggling with increasing demand for high thermal barrier coatings. To address this issue, multilayer graphene (Gr) was added as a reinforcement to NiAl bond coat. NiAl-based coatings with 0%, 0.6%, and 6% Gr were prepared via high-velocity oxygen fuel (HVOF), and their oxidation behaviors at 1050 °C were investigated. The results show that the addition of Gr apparently improves the high-temperature oxidation resistance of the NiAl coating. Mixed oxides of steady-state α-Al2O3 and metastable θ-Al2O3 form on the NiAl coating, while nearly pure α-Al2O3 is exhibited on the NiAl-0.6Gr and NiAl-6Gr coatings. The excellent oxidation resistance of the NiAl-0.6Gr coating is attributed to the dense protective α-Al2O3 layer formed by selective oxidation and the reduced agglomeration of Gr due to its appropriate content.