| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
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ACerS Robert B. Sosman Award Symposium: Advancing the Science of Materials for Extreme Environments
|
| Presentation Title |
Thermodynamic Assessment of Zr-B-C-O System Applied to Ultra High Temperature Ceramic Processing & Oxidation
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| Author(s) |
Erica L. Corral |
| On-Site Speaker (Planned) |
Erica L. Corral |
| Abstract Scope |
A thermodynamic model for the Zr-B-C-O quaternary system was developed to advance the fundamental understanding of ultra-high temperature ceramic processing science and predictability in extreme environments. We conducted this assessment using the CALPHAD framework and data obtained from first-principles calculations and literature. The calculated phase diagrams of the Zr-B-C-O system show the processing conditions for the prediction of accurate experimental parameters such as temperature, and gaseous environment, as well as additive content that maximizes oxygen removal and minimize formation of undesirable compounds. Improvements to the thermodynamic database include parameterization and incorporating first principle calculations for binary and ternary components of the Zr-B-C-O system. Examples of applying the calculated phase equilibrium diagrams to densify high purity and high strength ZrB<sub>2</sub> ceramics using spark plasma sintering will be discussed. The model also predicts the stability fields of ZrB<sub>2</sub> as a function of temperature and partial pressure for atomic and molecular oxygen. |