目的 研究环境温度对FeCoCrNiAl高熵合金涂层摩擦磨损性能的影响，探讨将其应用于高温及富氧环境中的可行性。方法 采用大气等离子喷涂制备FeCoCrNiAl高熵合金涂层，考察喷涂功率对涂层微观组织的影响;测试涂层的纳米力学性能，分析其对涂层摩擦磨损性能的影响;基于涂层及对偶磨球磨损表面形貌、元素分布及含量、物相组成，讨论涂层在室温及高温环境中的摩擦磨损特性与机制。结果 涂层中形成了白色、浅灰色、深灰色及黑色4种区域，区域颜色随O元素含量增加而加深，涂层纳米力学性能逐渐增加，进而将对其摩擦磨损性能造成影响。20 kW喷涂功率制备涂层的室温摩擦因数、磨损率及磨痕深度均达最佳值，分别为(0.70±0.02)、(9.22±0.01)×10^?5 mm³/(N?m)及(130±10) μm。室温环境下，磨粒磨损、疲劳磨损及塑性变形为涂层的主要磨损机制。20 kW功率制备涂层的摩擦因数、磨损率、磨痕深度等均随摩擦环境温度的升高先增加而后降低，经600 ℃摩擦试验后分别低至(0.58±0.01)、(6.14±0.01)×10^?5 mm³/(N?m)及(104±8) μm;涂层磨损表面的氧化程度随环境温度的升高而加剧，经600 ℃摩擦试验后氧含量高达31.62%(质量分数)。当摩擦环境温度≥400 ℃时，涂层以氧化磨损为主，以磨粒磨损、粘着磨损和疲劳磨损为辅。结论 由于磨损表面形成连续氧化膜的保护和固体润滑作用，高熵合金涂层在高温环境中的耐磨性明显提高，可广泛应用于高温及富氧环境中。

HIGH entropy alloys (HEAs) can be widely used in aerospace, biomedicine, new energy, nuclear industry, etc. for their high strength and hardness, superior wear resistance and corrosion resistance. However, the cost of HEAs is expensive due to the high price of each principal component. HEA coatings developed based on HEA theory and modern surface technology can not only reduce preparation cost, but also obtain superior properties. The work aims to prepare FeCoCrNiAl HEA coatings under a power of 15, 20 and 25 kW by atmospheric plasma spraying (APS) and investigate the effects of temperature on microstructure and wear resistance of HEA coatings.