Abstract:With the development of aviation technology, the demand for engines with high thrust to weight ratio, high efficiency, and low fuel consumption is increasing. The service conditions under extreme harsh conditions such as high temperature, high load, and high speed are also gradually receiving attention from researchers. Among them, the NiCoCrAlYTa/NiCoCrAlYTa-Cr2O3-Cu-Mo composite coating has gradually gained attention due to its excellent wear resistance at high temperatures. However, plasma spraying, as a thermal spraying technology, still has the disadvantage of exhibiting a typical layered structure between coatings, with multiple layers of spraying forming distinct hierarchical boundaries between coatings and the substrate interface, and the coating bonding method being mechanical bonding. Therefore, the laser-assisted atmospheric plasma spraying was used to prepare the NiCoCrAlYTa/NiCoCrAlYTa-Cr2O3-Cu-Mo composite coating, and the phase and microstructure of the coating before and after laser-assisted spraying, the microhardness and bonding strength of the coating, and the friction and wear properties of the coating were compared and analyzed. The results show that after laser treatment, the coating is dominated by Cr2Ni3 and NiO, with the formation of NiCr2O4 phase. The microhardness of the coating can reach 577.3HV0.3, which is about 28% higher than the microhardness of 451.6HV0.3 of the coating without laser treatment; After laser processing, the composite coating changes from mechanical bonding to metallurgical bonding, and the bonding strength increases by about 40%. After laser treatment, the friction and wear properties of the composite coating were further improved, showing good friction and wear performance at 800°C, with an average friction coefficient of 0.248 and a wear rate of 2.12×10-6mm3/N·m.