| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
Novel Refractory Bond Coat Alloy Capable of Alumina Formation Up to 1400°C (ULTIMATE Project) |
| Author(s) |
Collin S. Holgate, Carolina Frey, Melina A. Endsley, Akane Suzuki, Carlos G. Levi, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Collin S. Holgate |
| Abstract Scope |
Refractory alloys offer exciting opportunities to enhance the efficiency of gas turbine engines by replacing current Ni-based superalloys. However, bond coat alloys that provide oxidation protection to the current superalloys have inadequate temperature capability and are thermochemically incompatible with refractory alloys. The successful implementation of refractory alloys in the hot section of gas turbine engines will therefore require new protective bond coatings, the design of which is the focus of the presented work. Thermodynamic modeling (CALPHAD) was used to screen a large composition space, wherein a promising composition in the Nb-Si-Ti-Al-Hf space was selected and subsequently synthesized by arc melting. The alloy oxidized favorably to form alumina scales at 800°C, 1200°C, and 1400°C. Interdiffusion behavior with candidate structural Nb-Si alloys is also discussed. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Environmental Effects, High-Entropy Alloys, High-Temperature Materials |