| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
The Morphological and Compositional Stability of Nanoporous UHTCs During Fabrication From Metallic Precursors |
| Author(s) |
Catherine Ott, Ian McCue |
| On-Site Speaker (Planned) |
Catherine Ott |
| Abstract Scope |
Ultra-high temperature ceramics (UHTCs) have drawn interest for use in hypersonic structures due to their high melting points, excellent thermophysical properties, and reasonably low densities. UHTCs have been used as monolithic materials or coatings, but additional functionality (e.g., ablation resistance, transpiration cooling) can be introduced by fabricating porous form factors. We demonstrate that porous UHTCs can be synthesized from nanoporous metals via gas-phase conversion. The initial length scale of the porous metal can be tuned from 100 nm to 10 microns by raising the temperature of the dealloying melt. We aim to quantify the change during conversion so that the resulting feature size of the porous ceramic could optimize fluid trapping (such as a protective phase) or fluid flow (such as coolant). This talk discusses the interplay between conversion and coarsening, as a function of carbide phase fractions and nanoscale feature size, to create nanoporous UHTCs with stable features. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Temperature Materials, |