About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Ceramic Materials and Processing
|
Presentation Title |
Non-equimolar Multicomponent Rare Earth Oxides as Environmental Barrier Coatings |
Author(s) |
Elizabeth J. Opila, Kristyn Ardrey, Rachel Rosner, Prasanna Balachandran, Bi-Cheng Zhou, Patrick Hopkins |
On-Site Speaker (Planned) |
Elizabeth J. Opila |
Abstract Scope |
Equimolar “high-entropy” rare earth oxides have been investigated for environmental barrier coatings for structural alloys to be used in the hot section of turbine engines. Selection of the rare earth cation assemblage enables co-optimization of multiple coating properties including phase stability, thermal expansion, thermal conductivity, and resistance to molten siliceous debris. However, benefits of non-equimolar compositions have not typically been studied. In this presentation, the optimization of coating material properties through non-equimolar multicomponent compositions is investigated with particular emphasis on phase stability and thermal conductivity. Compositional space based on cubic rare earth sesquioxides Y, Yb, and Ho with additions of hexagonal Nd and La sesquioxides is explored. |
Proceedings Inclusion? |
Planned: |
Keywords |
Surface Modification and Coatings, |