Fig. 1. Reflectance spectra of as-deposited coating and annealed coating at 500 ℃ for 100 h and 400 h under standard atmospheric condition

Fig. 2. Reflectance spectral curves of annealed coating at 500 ℃ for different time under standard atmospheric condition. (a) 0‒2.5 μm; (b) 2.5‒25 μm

Fig. 3. XRD patterns. (a) XRD pattern of the target; (b) GI-XRD patterns of the coatings in the states of as-deposited and annealed at 500 ℃ for 100 h under standard atmospheric condition

Fig. 4. TEM images of the coating after heat treatment at 500 ℃ for 100 h under standard atmospheric condition. (a) Bright field TEM image of the coating; (b) cross-section TEM image of whole coating; (c)(d) HRTEM images of regions A and B denoted in Fig. 4(b); (e)(f) SAED images of regions A and B denoted in Fig. 4(b)

Fig. 5. Element distribution of the coating after heat treatment at 500 ℃ for 100 h under standard atmospheric condition. (a) HAADF-STEM image in Fig. 4(a) area, where the vertical lines indicate the locations of EDS line scanning data; (b) element proportion of line scanning area; (c)‒(h) spatial distributions of Al, Cl, Nb, Ti, N, and O

Fig. 6. Surface morphology of high-entropy oxynitride cermet photothermal conversion coatings. (a) As-deposited morphology; (b) surface morphology of the sample annealed at 500 ℃ for 400 h under standard atmospheric condition; (c) cross-sectional view

Fig. 7. AFM images of the coating. (a) As-deposited coating; (b) coating annealed at 500 ℃ for 400 h under standard atmospheric condition

Fig. 8. Schematic diagram of the structure and photothermal conversion mechanism of high-entropy oxynitride cermet coatings with a dual layered nanocomposite microstructure

Fig. 9. Schematic diagram of formation mechanism of cermet coatings with dual-layered nanocomposite microstructure