Abstract
To enhance the oxidation resistance of the coatings, a multi-component-doped NiCoCrAlYNbHfTa coating was prepared on an IN718 substrate by HVAF spraying technology. The impact of multi-component doping on the phases, microstructure characteristics, and isothermal oxidation behavior of the coatings was investigated. The experimental results showed that a dense and uniform coating was obtained under optimized spray coating parameters. The microstructure of the NiCoCrAlYNbHfTa coating differed from that of the commercial NiCoCrAlY coating in terms of the amount of γ’ and partial β phases. The NiCoCrAlYNbHfTa coating consisted of a significant amount of β solid solution and a certain quantity of γ’ intermetallic compounds, which improved the oxidation resistance and mechanical performance. The NiCoCrAlYNbHfTa coating demonstrated an excellent oxidation resistance with an oxidation rate of 3.8 × 10−14 cm2/s at 1000 °C, which was attributed to more β-phase solid solution, increased refractory metal oxides, and large-sized equiaxed grains in the oxide layer.
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