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<p>Pre-cladded layers of Ti and Ti/Y were deposited on CuTi alloy via laser cladding, followed by plasma nitriding. The effects of the addition of rare earth Y on nitriding mechanism and surface properties were systematically investigated. After nitriding, the Ti/Y composite modified layer exhibited a gradient structure comprising a high-N area (TiN and Ti<sub>2</sub>N) on the surface, a low-N area (TiN<sub>0.3</sub>) in the intermediate zone and the substrate. The incorporation of Y significantly enhanced nitrogen diffusion and nitride formation, increased nitride content and generated a nitride with higher N content. The surface hardness of the Ti/Y composite modified layer reached 794.59 HV<sub>0.3</sub> (208% higher than the substrate), with a wear rate of 0.0763 μm<sup>2</sup>/N, approximately 1/4 that before nitriding. Electrochemical tests revealed a notable shift in corrosion potential and a 93.7% reduction in corrosion current density for the Ti/Y composite modified layer, indicating superior corrosion resistance.</p>

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Mechanism and enhanced surface properties of rare earth Y catalyzed plasma nitriding for CuTi alloy

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Xiang Wang,
  • Fugui Zhong,
  • Jinli Zou,
  • Lingling Liu,
  • Xiaoxian Li,
  • Xuehui Zhang

摘要

Pre-cladded layers of Ti and Ti/Y were deposited on CuTi alloy via laser cladding, followed by plasma nitriding. The effects of the addition of rare earth Y on nitriding mechanism and surface properties were systematically investigated. After nitriding, the Ti/Y composite modified layer exhibited a gradient structure comprising a high-N area (TiN and Ti2N) on the surface, a low-N area (TiN0.3) in the intermediate zone and the substrate. The incorporation of Y significantly enhanced nitrogen diffusion and nitride formation, increased nitride content and generated a nitride with higher N content. The surface hardness of the Ti/Y composite modified layer reached 794.59 HV0.3 (208% higher than the substrate), with a wear rate of 0.0763 μm2/N, approximately 1/4 that before nitriding. Electrochemical tests revealed a notable shift in corrosion potential and a 93.7% reduction in corrosion current density for the Ti/Y composite modified layer, indicating superior corrosion resistance.