Fig. 1. Oxide film thickness on TC4 substrate and coating cross-section with different SiC contents^[27]. (a) TC4 substrate; (b) Ti-Al; (c) 99.4%(Ti-Al)+0.6%SiC; (d) 98.8%(Ti-Al)+1.2%SiC

Fig. 2. Average grain size and KAM value of the HEA coatings^[10]

Fig. 3. Oxidation kinetic curves of the alloy coatings with different Cr contents during being oxidized at 500 ℃ for 100 h^[36]. (a) Mass gain curves; (b) fitted lines of square mass gain

Fig. 4. Oxidation kinetics curves of various alloys under isothermal cycling at 800 ℃^[40]

Fig. 5. Schematic diagram of oxidation mechanism^[41]

Fig. 6. Element distribution maps of Y₂O₃/CoCrFeNiTiNb coating after oxidation at 800 ℃ for 50 h^[46]

Fig. 7. Micro-channel model of the oxide film on the surface of the coating^[51]. (a) Without nano-CeO₂; (b) with nano-CeO₂

Fig. 8. Photographical surface of three samples after high temperature oxidation at 600 ℃ and 900 ℃^[55]

Fig. 9. Schematic diagram of the coating micromorphology before and after HCPEB irradiation^[60]

Fig. 10. Effect of ultrasonic vibration power on dendrite morphology and the size and distribution of ceramic phases in the coatings^[67]. (a) Dendrite morphology without ultrasonic vibration assistance; (b) dendrite morphology with 300 W ultrasonic vibration assistance; (c) size and distribution of ceramic phases without ultrasonic vibration assistance; (d) size and distribution of ceramic phases with 300 W ultrasonic vibration assistance

Fig. 11. Surface images of Co-based coating after high-temperature oxidation at 650 ℃^[69]. (a) Without field assistance; (b) with ultrasonic filed assistance; (c) with magnetic field assistance; (d) with magnetic and ultrasonic fields assistance