| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
J-97: The Oxidation Behavior of the Eutectic Alloy Mo-20Si-52.8Ti in Dry and Wet Atmospheres |
| Author(s) |
Matthias Weber, Steven Schellert, Hans-Jürgen Christ, Aditya Srinivasan Tirunilai, Alexander Kauffmann, Martin Heilmaier, Bronislava Gorr |
| On-Site Speaker (Planned) |
Matthias Weber |
| Abstract Scope |
Mo-silicide based alloys with high Ti concentrations are a new class of high temperature materials with promising properties. The good oxidation resistance relies on the formation of a duplex titania-silica layer. In this contribution, the effect of water vapor on the formation and growth of oxide scales on the alloy Mo-20Si-52.8Ti (at. %) at 1200°C is investigated. The oxidation kinetics increases in wet atmospheres compared to that in dry air. To explore whether the outer TiO2 layer can diminish the detrimental effect of water vapor, this scale was removed which causes a dramatic acceleration of the scale growth kinetics in the wet environment. This was explained by the faster diffusion of water in silica compared to that of oxygen. It is discussed that water vapor may increase the pore density in silica, which further accelerates the diffusion of water and/or oxygen in silica. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Environmental Effects, Characterization |