About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrahigh-Temperature Processing and Manufacturing
|
| Presentation Title |
Oxidation of Refractory Metals and Carbides in Ultra-High Temperature Dissociated Oxygen |
| Author(s) |
Elizabeth J. Opila, Connor Stephens |
| On-Site Speaker (Planned) |
Elizabeth J. Opila |
| Abstract Scope |
Refractory metals and their carbides are proposed for hypersonic vehicle leading edges where exposure to ultra-high temperature dissociated oxygen will occur, however fundamental material response mechanisms in these environments are not well characterized. A microplasma resistive heating system was designed to accomplish ultra-high temperature material exposures in controlled gas streams containing molecular oxygen or partially dissociated oxygen to isolate effects of the more reactive atomic oxygen. In the work described here Ta, TaC, Zr and ZrC were exposed to partially dissociated oxygen at temperatures of 1300-1800°C for times up to 10 minutes. Dissociated oxygen was found to increase oxygen dissolution into refractory metals at short times, increase the oxidation rate of the underlying substrate where direct access of atomic oxygen to the surface was available, and preferentially attack grain boundaries. These results aid in mechanistic understanding of ultra-high temperature materials degradation for hypersonic applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Environmental Effects, |