2024-10-21 アメリカ合衆国・バージニア大学 (UVA)
＜関連情報＞
- https://engineering.virginia.edu/news-events/news/uva-researchers-develop-new-coatings-boost-turbine-engine-efficiency
- https://www.sciencedirect.com/science/article/abs/pii/S1359646224002410?via%3Dihub
多成分希土類酸化物を用いた新しい耐火合金熱/環境バリアコーティングの可能性 Opportunities for novel refractory alloy thermal/environmental barrier coatings using multicomponent rare earth oxides
Kristyn D. Ardrey, Mackenzie J. Ridley, Kang Wang, Kevin Reuwer, Giavanna Angelo, Kevin Childrey, William Riffe, Mahboobe Jassas, Mukil Ayyasamy, Prasanna V. Balachandran, Patrick E. Hopkins, Jonathan Laurer, Carolina Tallon, Bi-Cheng Zhou, Elizabeth J. Opila
Scripta Materialia Available online 4 June 2024
DOI:https://doi.org/10.1016/j.scriptamat.2024.116206
Abstract
Opportunities are described for developing coatings for refractory alloys beyond the current state-of-the-art silicide coatings, which are inadequate for long-term application in combustion environments due to silica volatility. It is proposed that multicomponent rare earth oxides provide an ideal material system to tailor all necessary properties for environmental/thermal barrier coatings in a single layer, differing from current trends to adopt multi-layer systems that are prone to thermochemical-mechanical interface failure mechanisms. The article discusses opportunities, proof-of-concept, and challenges to accomplish these single-layer rare earth oxide coatings. Properties of interest include isotropic phase stability, processability, thermal expansion, thermal conductivity, ability to perform as a radiation barrier, stability in combustion environments, CMAS resistance, and ability to act as an oxygen diffusion barrier. Both experimental and computational approaches for property optimization are described.
