| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Design and Evaluation of Multicomponent Rare Earth Disilicate Environmental Barrier Coatings |
| Author(s) |
Richard P. Oleksak, Shiqiang Hao, Michael C. Gao, Casey S. Carney, Mohammad D. Hossain, Ömer N. Doğan |
| On-Site Speaker (Planned) |
Richard P. Oleksak |
| Abstract Scope |
Environmental barrier coatings (EBCs) are required for protecting silicon carbide-based ceramic matrix composites in current and future gas turbines. Current generation EBCs typically use the single component rare earth disilicate Yb2Si2O7 as part of a multilayer coating system. Incorporating multiple rare earth elements in place of Yb has been shown an effective approach to improve coating properties. However, selection of optimal multicomponent compositions is not a trivial question. Important considerations include phase stability, thermal expansion behavior, raw material cost, among others. Herein we use DFT based methods to design new multicomponent rare earth disilicate materials predicted to be high performance EBCs. Bulk materials are produced and characterized for experimental validation of computed properties. In addition, a laser-based rig newly developed at NETL is described that is capable of testing ceramic materials and coatings at conditions that closely simulate gas turbine combustion environments. Preliminary coating performance results are presented and discussed. |
| Proceedings Inclusion? |
Planned: |