Ta effect on oxidation of a nickel-based single-crystal superalloy and its sputtered nanocrystalline coating at 900–1100 °C

作者：Jinlong Wang; Minghui Chen; Shenglong Zhu; Fuhui Wang

来源：Applied Surface Science, 2015, 345: 194-203.

• Single-crystal superalloys
• Nanocrystalline coating
• High-temperature oxidation
• Reactive element effect

Sputtering nanocrystalline coating was prepared on a nickel-based single-crystal superalloy N5. The oxidation behavior of the superalloy substrate and its nanocrystalline coating was investigated at 900–1100 °C. Results indicated that the nanocrystalline coating enhanced the oxidation and scale spallation resistance of the single-crystal superalloy. Elements interdiffusion has not occurred between the substrate and coating. Refractory element, Ta, inherently contained in N5, had a significant effect on the scale microstructure and oxidation behavior of both the single-crystal superalloy substrate and its sputtering nanocrystalline coating.