| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Thermodynamics of Materials in Extreme Environments
|
| Presentation Title |
P2-19: Design of Ultra-high Temperature Ceramics for
Oxidation Resistance |
| Author(s) |
Niquana S, Elizabeth Opila Opila |
| On-Site Speaker (Planned) |
Niquana S |
| Abstract Scope |
Ultra-high temperature ceramics (UHTCs) are capable of withstanding extreme temperatures above 2500°C. Specifically, hafnium carbide (HfC) and tantalum carbide (TaC) have the highest melting points amongst UHTCs, however, rapid oxidation of these materials is a persistent problem. In this work, the oxidation of pure HfC and TaC was studied at 1400°C in 1% oxygen/argon for times up to 10 minutes. These oxidation results demonstrated that pure TaC oxidizes more rapidly than pure HfC. In situ oxidation was also conducted at the Argonne National Lab Advanced Photon Source, in 0.06 % oxygen/argon. Results showed more formation of protective Hf6Ta2O17 for 6HfC-4TaC compared to 9HfC-1TaC. The results obtained from these experiments demonstrate steps closer to obtaining an optimal oxidation resistant UHTC. |