About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Multi-component Rare Earth Silicates for Dual Purpose Thermal/Environmental Barrier Coatings |
Author(s) |
Mackenzie Ridley, Cameron Miller, David H Olson, Kathleen Quiambao Tomko, Alejandro Salanova, Patrick Hopkins, Jon Ihlefeld, Cormac Toher, Elizabeth Opila |
On-Site Speaker (Planned) |
Elizabeth Opila |
Abstract Scope |
SiC ceramic matrix composites (CMCs) for application in turbine engine hot sections require environmental barrier coatings (EBCs) to prevent thermochemical reactions with the combustion environment. Dual-purpose thermal/environmental barrier coatings (T/EBCs) are proposed materials to decrease operating temperatures and oxidation rates of the underlying CMC and the required silicon bond coat. Multi-component rare earth silicates represent T/EBC candidates through their low thermal conductivities compared to single rare earth cation silicate materials. The phase stability, thermal expansion coefficient (CTE), and high-velocity steam reactivity of multi-component rare earth silicates were analyzed. Phase stabilization of low-CTE polymorphs desired for EBCs and tailoring of steam reaction products will be addressed. |
Proceedings Inclusion? |
Undecided |