| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Corrosion and Environmental Degradation: Theory and Practice
|
| Presentation Title |
CMAS Corrosion Resistance and Mechanisms of High Entropy Rare-Earth Phosphates as Potential Environmental Barrier Coatings |
| Author(s) |
Keith Bryce, Bishnu Pada Majee, Liping Huang, Jie Lian |
| On-Site Speaker (Planned) |
Jie Lian |
| Abstract Scope |
Multiple component rare-earth phosphates are explored as potential candidates for next generation environmental barrier coatings (EBCs), and their corrosion behavior and mechanisms against molten CMAS attack are investigated systematically at different temperatures and durations. A dense and uniform Ca8MgRE(PO4)7 reaction layer forms upon interaction of (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4 pellets with CMAS at 1300 °C, preventing CMAS penetration into the bulk pellet. In contrast, complete penetration of CMAS occurred in the bulk pellet at 1500 oC for 5 hours as no reaction layer was formed. The effects of duration, temperature, and compositions on the resistance against CMAS corrosion are discussed within the context of optimizing materials design and performance of high entropy rare-earth phosphates as candidates for advanced EBC applications. |