About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
High Temperature Oxidation Behavior of Ta vs TaC |
Author(s) |
Connor J. Stephens, Elizabeth J Opila |
On-Site Speaker (Planned) |
Connor J. Stephens |
Abstract Scope |
Ultra-high temperature materials are needed for leading-edge components of hypersonic vehicles which can withstand large stresses and high temperatures in highly oxidizing environments. Select transition metals and metal carbides have high strength and form stable oxides at “ultra-high” temperatures (Tm > 1700°C). However, they have notably poor oxidation resistance and the oxidation mechanisms above 1300°C are not well understood. Additionally, a direct comparison of the high-temperature oxidation behavior of metals and carbides has not been previously reported. In this work, the oxidation kinetics of Ta and TaC were studied by resistively heating samples to 1300-1500°C in a 1% O2 (bal. Ar) environment for 2-10 minutes. The resulting oxides were characterized via SEM (plan view and cross section) and XRD. The carbide exhibited a more rapid oxidation rate than the metal. Further comparison of the high temperature oxidation behavior of these materials will be discussed. |