| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Stability of Nanoporous Ultra-High Temperature Ceramics at High Temperatures |
| Author(s) |
Catherine Ott, Luis Granadillo, Ian Mccue |
| On-Site Speaker (Planned) |
Ian Mccue |
| Abstract Scope |
Ultra-High Temperature Ceramics (UHTCs) are promising materials for use in next-generation hypersonic platforms owing to their high melting points and excellent thermo-mechanical properties. However, despite these advantages, oxidation and evaporative mass-loss in these materials limit their long-term service. To address this shortcoming, we are studying the synthesis and high-temperature oxidation behavior of nanoporous UHTCs infiltrated with either an ablative polymer or oxidation-resistant glass. These materials are fabricated by first exposing nanoporous refractory metals to carburizing and/or nitriding environments, and then imbibing with a viscous phase that solidifies inside the pores. The performance of these materials is governed by the length scale of the characteristic feature (the ligament diameter) – with smaller ligaments leading to superior performance – which unfortunately degrade via coarsening during service. In this talk we will discuss the synthesis of these materials, their overall performance at elevated temperatures, and governing kinetic equations describing their stability and decomposition |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Environmental Effects, High-Temperature Materials |