<p>Doping active elements into the adhesive layer effectively inhibits the formation of brittle phases, such as spinel, and enhances the coating's high-temperature oxidation resistance. In this study, a NiCoCrAlY-nano-HfO₂ coating was fabricated using laser cladding technology. The effect of nano-HfO₂ doping on the oxidation behavior of NiCoCrAlY coatings was investigated at 1100&#xa0;°C. The results show that nano-HfO₂ doping improves the hardness of the cladding layer. Initially, at high temperatures, nano-HfO₂ doping promotes the selective oxidation of the alumina film. During oxidation, hafnium oxide diffuses into the vicinity of the oxide film, promoting the formation of an oxide pinning structure, which improves the exfoliation resistance of the oxide film. Additionally, the large size and low solubility of HfO₂ result in its distribution at the interface between the two phases, inhibiting Al diffusion, limiting oxide film growth, delaying the formation of the spinel phase in the oxide film, reducing the growth rate of the thermally grown oxide (TGO), and enhancing the high-temperature oxidation resistance of the coating.</p>