A new solar spectral selective absorbing coating of SS–(Fe3O4)/Mo/TiZrN/TiZrON/SiON for high temperature application

• A new solar selective absorbing coating of SS–(Fe3O4)/Mo/TiZrN/TiZrON/SiON was prepared on SS substrate.
• The new coating exhibits a high absorptance of 0.95 and a low emittance of 0.08.
• The spectral properties of the coating are stable up to 500 °C in vacuum.

In this study, a solar spectral selective absorbing coating of SS–(Fe3O4)/Mo/TiZrN/TiZrON/SiON exhibiting an absorptance of 0.95 and an emittance of 0.08 at 80 °C is reported. The structure and morphology of each layer were investigated by X-ray and Fourier transform infrared spectroscopic analyses. After heat treatment at 500 °C for 300 h in vacuum, the values of absorptance and emittance became 0.92 and 0.10 (at 80 °C), respectively. Moreover root mean square roughness of the coating measured by atomic force microscopy increased to 8.14 nm from 4.79 nm, indicating good thermal stability at 500 °C.

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