| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
A Thermodynamic Database for Ultra-high Temperature Ceramics |
| Author(s) |
Weiwei Zhang, Paul Mason, Adam T. Hope |
| On-Site Speaker (Planned) |
Adam T. Hope |
| Abstract Scope |
Hypersonic aircraft and space vehicles need ultra-high temperature ceramics that can work under extreme environments. These are typically non-oxides with melting/decomposition temperatures higher than 3000°C, including borides, nitrides, and carbides of Group IV-V metals. There is a great potential for engineers to understand the phase stability, thermodynamic properties and melting temperature etc. for various compositions using Integrated Computational Materials Engineering (ICME) tools to predict the materials behavior and to design materials that can work under different operating conditions. The basis of most ICME frameworks derive from an understanding of the underlying thermodynamics and phase equilibria that drive phase transformations. A thermodynamic database has been developed using the CALPHAD approach for the Hf-Si-Ta-Zr-B-C-N system (including, but not limited to ZrB2-HfB2-ZrC-HfC-TaC-HfN-SiC) that fulfills those needs. All the binaries and 26 ternary systems have been assessed. In total, 35 phases are included. Validations have been made using multicomponent experimental data from the literature. |