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<p>The IN718 alloy substrate was successfully produced using laser metal deposition (LMD) technology. The optimal scanning path for the substrate was selected by characterizing the properties of blocks prepared using different scanning paths. The NiTICrNbTa refractory high-entropy alloy (RHEA) coating was deposited on the substrate, and surface treatment was applied to the coating. The microstructure, hardness, and high-temperature oxidation resistance of the coating were studied by various characterization methods. The hardness of the coating is twice time that of the substrate and is further increased by a factor of two after high-temperature treatment. The coating also exhibits superior high-temperature oxidation resistance compared to the substrate. Additionally, the surface of the treated coating is hydrophobic, with a contact angle of 110.1 deg, whereas the contact angle before treatment was 50.2 deg.</p>

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Microstructure, Microhardness and High-Temperature Oxidation Properties of NiTiCrNbTa Hydrophobic Alloy Coating on IN718 Prepared by Laser Metal Deposition

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Huanjiang Liu,
  • Chao Wang,
  • Juanjuan Li

摘要

The IN718 alloy substrate was successfully produced using laser metal deposition (LMD) technology. The optimal scanning path for the substrate was selected by characterizing the properties of blocks prepared using different scanning paths. The NiTICrNbTa refractory high-entropy alloy (RHEA) coating was deposited on the substrate, and surface treatment was applied to the coating. The microstructure, hardness, and high-temperature oxidation resistance of the coating were studied by various characterization methods. The hardness of the coating is twice time that of the substrate and is further increased by a factor of two after high-temperature treatment. The coating also exhibits superior high-temperature oxidation resistance compared to the substrate. Additionally, the surface of the treated coating is hydrophobic, with a contact angle of 110.1 deg, whereas the contact angle before treatment was 50.2 deg.