| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-127: Thermal Expansion of MoSi2-Si Oxidation Barrier System for RHEA-Based Gas Turbines |
| Author(s) |
Matthew Betz, Zachary Moscoso, Don Lipkin, Raymundo Arroyave |
| On-Site Speaker (Planned) |
Matthew Betz |
| Abstract Scope |
Refractory high-entropy alloys (RHEAs) are of interest in high-temperature structural applications, such as for advanced gas turbines, owing to their exceptional strength retention at high temperatures compared to Ni/Co-based superalloys. However, refractory alloys suffer rapid degradation in oxidizing environments and are thermochemically and thermo-mechanically incompatible with conventional alumina-forming oxidation barrier systems. The MoSi₂-Si system is being evaluated as a candidate oxidation barrier coating for RHEAs, with the goal to combine oxidation resistance, chemical and CTE compatibility with the refractory alloy substrates. Spark plasma sintered (SPS) MoSi₂-Si samples with varying phase fractions were characterized using XRD, SEM, and dilatometry as a first step toward identifying a viable coating system. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Surface Modification and Coatings, Ceramics, High-Temperature Materials |