A robust, hydrophobic CeO₂/NiCoCrAlY composite coating with excellent thermal stability and corrosion resistance prepared by air plasma spray

Hydrophobic coatings based on organic or ceramic materials usually suffer from low wear resistance and poor thermal stability, which limit their practical applications. Here we report a robust, hydrophobic CeO2/NiCoCrAlY composite coating prepared by air plasma spraying (APS), which shows superior wear resistance, excellent high-temperature stability and high bonding strength with the substrate. The coating can maintain its hydrophobicity after abrasion under 10 kPa over a 4 m distance, or after annealing at 773 K for 8 h. It also presents good corrosion resistance to protect the metallic substrate under corrosive working conditions. The CeO2/NiCoCrAlY composite coating provides a reliable and effective route to fabricate hydrophobic surfaces which may have potential applications in harsh environments. (C) 2021 Elsevier B.V. All rights reserved.