About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Ceramic Materials and Processing
|
Presentation Title |
Mapping the Creation of Nanoporous Ultra-high-temperature Ceramics |
Author(s) |
Catherine Ott, Ian McCue |
On-Site Speaker (Planned) |
Catherine Ott |
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, due to processing limitations, these materials are largely synthesized as dense components. In this work, we examine a new processing strategy to synthesize nanoporous UHTCs, which can be later infiltrated to impart new functionality—for instance, infiltrating the pores with a polymer to act as a reusable ablator. Our strategy uses techniques from metallurgy and corrosion to produce nanoporous refractory precursors, which are then converted into ultra-high-temperature ceramics via gas-phase decomposition at elevated temperature. Here, Ta precursors were exposed to carburizing and nitriding environments over a range of temperatures and times to generate time-temperature-transformation diagrams. Kinetic models were developed for degree of conversion and degree of coarsening to quantify the process for creation of ultra-high-temperature ceramics that retain a nanoporous structure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, High-Temperature Materials, Powder Materials |