| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
Evaluation of YbPO4 as an Environmental Barrier Coating Candidate |
| Author(s) |
Mackenzie Ridley, Bohuslava McFarland, Cameron Miller, Elizabeth Opila |
| On-Site Speaker (Planned) |
Mackenzie Ridley |
| Abstract Scope |
Application of SiC-base ceramic matrix composites (CMCs) as turbine hot section components requires environmental barrier coatings (EBCs) for protection against thermochemical reactions with the combustion environment. Current generation EBCs are ytterbium disilicates, yet durability issues remain prevalent. Ytterbium phosphate, YbPO4, was analyzed as a novel environmental barrier coating material candidate. Thermal expansion, high-temperature high-velocity steam resistance, CaO-MgO-Al2O3-SiO2 (CMAS) resistance, and thermochemical stability with SiO2 were addressed. YbPO4 displayed enhanced stability against high-velocity steam and CMAS degradation compared to state-of-the-art EBC material Yb2Si2O7. Initial thermomechanical and thermochemical analysis indicate that YbPO4 should be further explored as a viable material candidate for next-generation EBC systems. |