目的 研究hBN含量对CuAl/hBN可磨耗封严涂层在450 ℃下磨耗性能的影响。方法 利用大气等离子喷涂工艺制备原始粉末中hBN质量分数分别为10%、15%、20%、25%的CuAl/hBN涂层。采用QUALITEST表面洛式硬度仪表征喷涂态涂层表面洛氏硬度。采用高温摩擦磨损试验机及场发射扫描电镜等方法，表征450 ℃下涂层及摩擦副的磨损形貌和质量磨损比，探讨涂层的磨损机理。结果 随着原始粉末中hBN质量分数由10%增加至25%，所制备喷涂态涂层的表面洛式硬度逐渐降低，分别为69HR15Y、56HR15Y、46HR15Y、36HR15Y。涂层与摩擦副之间的质量磨损比分别为?0.88%、?0.25%、?0.13%、?1.40%，在原始粉末中hBN质量分数为20%时质量磨损比更接近0，涂层磨耗性能更优异。涂层与摩擦副在相对摩擦过程中，主要以涂层的磨损剥落为主。在摩擦销接触面上同时观察到混合转移层，且随着涂层hBN含量的增高，接触面转移层质量先减小后增大，表面涂抹程度更加平缓，形貌起伏更加均匀。结论 低线速度条件下，摩擦热效应对涂层及摩擦副形貌及二者间的磨损行为的影响起关键作用。hBN组分理论上存在最优值，保证封严涂层获得最佳的磨耗性能。综合而言，CuAl/20%hBN涂层与摩擦副的摩擦相容性更优异。

The Al/hBN abradable seal coating is mainly used on the wall of the stator casing of the medium and low pressure compressor of aero-engine. Previous studies have found that the addition of dendritic Cu to Al/hBN powder reduces the hBN burn-off ratio in the as-deposited coating, the distribution of non-metallic components is more uniform, and the abradability of the coating is higher. This paper aims to further analyze the effect of powder hBN content on the wear performance of CuAl/hBN wear-resistant seal coating at 450 ℃ based on this research. The adopted methods include:using atmospheric plasma spraying process to prepare CuAl/hBN coatings with hBN content of 10%, 15%, 20% and 25%, respectively. The Rockwell hardness of the spray coating surface is characterized by the QUALITEST Surface Rockwell hardness tester. Using the high temperature friction and wear testing machine produced by Bruker, and setting a constant axial load, the wear morphology and mass wear ratio of the coating and the friction pair under the condition of low linear speed and 450 ℃ were studied and analyzed. Theoretical mechanism of coating wear behavior.