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<p>A Zr-Cr-Y coating was prepared on the <i>γ</i>-TiAl alloy by double-glow plasma surface alloying technology. The microstructure, phase composition, and oxidation performance of the coating at 850&#xa0;°C were analyzed. The Zr-Cr-Y coating is continuous, dense, and free of obvious pores and cracks, with a total thickness of approximately 15.3 ± 0.5&#xa0;μm, consisting of an outer deposition layer and an inner gradient diffusion layer. After oxidation at 850&#xa0;°C for 100&#xa0;h, the mass gain of the coated <i>γ</i>-TiAl is approximately one-seventh of that of the uncoated alloy, and the oxidation kinetics follows a parabolic law with a much lower oxidation rate constant. The oxide scale of the uncoated alloy is loose and stratified, mainly composed of TiO<sub>2</sub> with poor protectiveness. In contrast, the Zr-Cr-Y coating forms a dense and stable composite oxide layer dominated by Cr<sub>2</sub>O<sub>3</sub>, accompanied by ZrO<sub>2</sub> and a small amount of Al<sub>2</sub>O<sub>3</sub> during oxidation, which effectively inhibits the inward diffusion of oxygen and the outward diffusion of Ti.</p>

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High-Temperature Oxidation Behavior of Zr-Cr-Y Coating Prepared by Double-Glow Plasma Surface Alloying

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Lin Chen,
  • Dong Han,
  • Na Hu,
  • Dan Hu,
  • Zhiyang Zhang,
  • Lijing Yang,
  • Guangrui Gao

摘要

A Zr-Cr-Y coating was prepared on the γ-TiAl alloy by double-glow plasma surface alloying technology. The microstructure, phase composition, and oxidation performance of the coating at 850 °C were analyzed. The Zr-Cr-Y coating is continuous, dense, and free of obvious pores and cracks, with a total thickness of approximately 15.3 ± 0.5 μm, consisting of an outer deposition layer and an inner gradient diffusion layer. After oxidation at 850 °C for 100 h, the mass gain of the coated γ-TiAl is approximately one-seventh of that of the uncoated alloy, and the oxidation kinetics follows a parabolic law with a much lower oxidation rate constant. The oxide scale of the uncoated alloy is loose and stratified, mainly composed of TiO2 with poor protectiveness. In contrast, the Zr-Cr-Y coating forms a dense and stable composite oxide layer dominated by Cr2O3, accompanied by ZrO2 and a small amount of Al2O3 during oxidation, which effectively inhibits the inward diffusion of oxygen and the outward diffusion of Ti.