| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
Coatings for Improving the High Temperature Oxidation Resistance of Mo-based Systems
|
| Author(s) |
Katharina Beck, Frauke Hinrichs, Martin Heilmaier, Anke Silvia Ulrich, Mathias Christian Galetz |
| On-Site Speaker (Planned) |
Katharina Beck |
| Abstract Scope |
The range of operation temperature of conventionally used Ni-base alloys ends at around 1100 °C. New materials are required to further increase the operation temperatures in order to improve the performance and efficiency of combustion engines.
The high melting point and good mechanical properties of Mo-based refractory systems designate them as promising substitutes. To counteract their oxidation issues, foremost pesting, two strategies are followed: i) smart alloying with Si and Ti and ii) coating application (e.g., Al or Cr-based).
Cr- and Al-coatings with layer thicknesses between 10 and 120 μm were successfully applied on pure Mo and Mo-Si-Ti alloys (eutectic and eutectoid) using pack-cementation processes. Oxidation kinetics were investigated using thermogravimetric analysis for 100 h in synthetic air at three different temperatures (700°C, 900°C, 1300°C). The obtained kinetics were correlated to Cr₂O₃ and Al₂O₃ oxide scale formation investigated using XRD, EPMA, and SEM. |