电弧离子镀制备NiCoCrAlY涂层高温抗氧化性能研究*

doi:10.13385/j.cnki.vacuum.2026.05.01

摘要/Abstract

摘要： 镍基高温合金因其优异的高温力学性能被广泛用于燃气轮机热端部件,但在950℃以上长期服役时易发生快速氧化而失效。本研究旨在利用电弧离子镀技术在IN925镍基合金基体上沉积NiCoCrAlY涂层,并系统评估基体和涂层在950℃ 和1 050℃空气中的等温氧化性能与机制。通过200 h氧化动力学测试及三维共聚焦显微镜、能谱分析、X射线衍射和扫描电子显微镜等表征测试方法进行分析。结果表明：涂层表面能快速形成连续致密且附着力良好的α-Al₂O₃保护膜,使950℃和1 050℃下的氧化速率分别较无涂层基体降低19.6%和21.9%;无涂层基体表面生成Cr₂O₃、NiCr₂O₄和TiO₂等多相疏松氧化物,易剥落失效。因此,电弧离子镀制备的NiCoCrAlY涂层能显著提高IN925合金的高温抗氧化性能。

关键词: 电弧离子镀, NiCoCrAlY涂层, IN925镍基合金, 高温氧化

Abstract: Nickel-based superalloys are widely used in the hot end components of gas turbines owing to their excellent high-temperature mechanical properties. However, they are prone to rapid oxidation failure during long-term service at temperatures above 950℃. This study aims to deposit a NiCoCrAlY coating on an IN925 nickel-based alloy substrate using arc ion plating technology and then systematically evaluate the isothermal oxidation performance and mechanisms of both the substrate and the coating in air at 950 and 1 050℃. The analysis is conducted through 200-hour oxidation kinetics tests and characterization methods including X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and three-dimensional confocal microscopy. The results indicate that the coating can rapidly form a continuous, dense, and well-adhered α-Al₂O₃ protective film on its surface, leading to a reduction in oxidation rates of 19.6% and 21.9% at 950℃ and 1 050℃, respectively, compared to than of the uncoated substrate. The uncoated substrate, on the other hand, generates a loose, multi-phase oxide layer consisting of Cr₂O₃, NiCr₂O₄, and TiO₂, which is prone to spalling and failure. Therefore, the NiCoCrAlY coating deposited via arc ion plating significantly enhances the high-temperature oxidation resistance of IN925 alloy.

Key words: arc ion plating, NiCoCrAlY coating, IN925 nickel-based alloy, high temperature oxidation

中图分类号: TG174.4

郑英杰, 徐兴华, 孙彬, 魏枫, 孙飞, 蔺增. 电弧离子镀制备NiCoCrAlY涂层高温抗氧化性能研究^*[J]. 真空, 2026, 63(5): 1-11.

ZHENG Yingjie, XU Xinghua, SUN Bin, WEI Feng, SUN Fei, LIN Zeng. Study on High Temperature Oxidation Resistance of NiCoCrAlY Coatings Prepared by Arc Ion Plating[J]. VACUUM, 2026, 63(5): 1-11.

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