采用激光熔覆技术,在镍基高温合金表面制备相同含量的3种不同纳米颗粒增强的NiCoCrAlY涂层,考察它们在500℃空气氛围下的干摩擦磨损行为,并与未加纳米颗粒的涂层进行比较。结果表明:纳米颗粒增强涂层的高温摩擦磨损机制与未加纳米颗粒的涂层一致,均为强烈塑性变形引起的剥层磨损和氧化磨损;加入纳米颗粒后,涂层的摩擦因数增大且随滑行距离的增加呈减小趋势,涂层的磨损率仅为未加纳米颗粒涂层的34.0%～64.5%。在3种纳米颗粒中,纳米SiC颗粒对涂层高温耐磨性的改善最为显著。 NiCoCrAlY coatings with the same content of three different nano-particles were prepared by laser cladding on the surface of Ni-based superalloy. The dry friction and wear behavior of NiCoCrAlY coatings at 500 ℃ in air was investigated. Compared with the coating without nano-particles Compare. The results show that the friction and wear mechanism of the nanoparticle-reinforced coating at high temperature is consistent with that without nanoparticle coating, which are both the delamination wear and oxidative wear caused by the strong plastic deformation. When the nanoparticle is added, the friction coefficient of the coating increases With the increase of the sliding distance, the coating tends to decrease, and the wear rate of the coating is only 34.0% ~ 64.5% of that of the uncoated coating. Of the three kinds of nanoparticles, the improvement of the wear resistance of the coating at high temperature by the nano-SiC particles is the most significant.