In this series of posts, we are trying to review scientific research related to our company’s activities.
The title of the article we will review today is:”Nanocrystalline Y2O3-modified metal matrix composite coatings with improved resistance to thermocyclic oxidation and V2O5-induced type II hot corrosion.”
Authors and Journal: The paper was written by Christoph Grimme, Kan Ma, Robin Kupec, Ceyhun Oskay, Emma M.H. White, Alexander J. Knowles, and Mathias C. Galetz. It was published in the journal Surface & Coatings Technology
This study focuses on developing Ni–Al and Ni-Cr-Al type metal matrix composite (MMC) coatings on Inconel 617 (IN617), incorporating up to 11 vol% of Yttria (Y2O3) nanoparticles. The Y2O3 nanoparticles and Ni were co-electrodeposited on IN617, followed by either pack aluminizing or a two-step chromizing and aluminizing process. The coatings were tested for oxidation at 1100°C and hot corrosion at 700°C. The presence of Y2O3 significantly enhanced the oxidation and corrosion resistance by reducing interdiffusion, improving oxide scale adherence, and binding V2O5. The study highlights the potential of this method for advanced turbine blade coatings.
The paper also discusses the challenges of incorporating reactive elements (RE) into turbine coatings, which can lead to compromised strength, heightened brittleness, and reduced adhesion. However, RE oxides offer advantages of avoiding these detrimental effects, counteracting corrosion phenomena induced by V2O5 compounds, and enhancing oxidation resistance. The study emphasizes the importance of optimizing RE oxide particle incorporation and understanding the influence of particles in coating microstructures.
Key Features of Research:
- Development of Ni–Al and Ni-Cr-Al type MMC coatings with Y2O3 nanoparticles.
- Enhanced oxidation and corrosion resistance due to Y2O3 nanoparticles.
- Reduction of interdiffusion and improved oxide scale adherence.
- Potential application for advanced turbine blade coatings.
- Challenges and solutions for incorporating reactive elements into turbine coatings.
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