| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Sandphobic Thermal/Environmental Barrier Coatings
|
| Presentation Title |
Progress and Challenges in Understanding CMAS Attack and Developing CMAS-phobic T/EBCs |
| Author(s) |
Andy Nieto, Clara Hofmeister-Mock, Richa Agrawal, Luis Bravo, Anindya Ghoshal, Michael Walock, Muthuvel Murugan |
| On-Site Speaker (Planned) |
Andy Nieto |
| Abstract Scope |
This talk will examine the studies conducted over the last decade or so on the mechanisms of calcia-magnesia-alumina-silicate (CMAS) attack on thermal and environmental barrier coatings (T/EBCs). Gas turbine engines are exposed to partially and fully molten environmental particulates, such as volcanic ash, runway debris, dust, salt, and sand (collectively referred to as CMAS formers). These molten particulates accumulate on the surface of T/EBCs on turbine blades where they can cause airflow blockage and induce adverse chemical reactions on the ceramic coatings. The current set of TBC solutions have been optimized for low thermal conductivity and high erosion resistance. New T/EBCs must incorporate these properties alongside resistance to CMAS attack and ideally provide non-wetting behavior with molten CMAS. This talk addresses the key findings on CMAS attack mechanisms and the evaluation of promising solutions for preventing CMAS damage. Lastly, guidance on future research efforts to achieve CMAS-phobic T/EBCs is presented. |