About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Hot Corrosion of Mo-Si-B and Its Derivates with Ti or Cr between the 500°C - 900°C Range |
| Author(s) |
Lukas Korell, Katharina Beck, Till König, Ceyhun Oskay, Frauke Hinrichs, Martin Heilmaier, Mathias Galetz |
| On-Site Speaker (Planned) |
Mathias Galetz |
| Abstract Scope |
The state-of-the-art turbine materials Ni-based alloys currently operate at temperatures close to their melting point. To further increase the turbine inlet temperatures and thereby improving the efficiency, refractory elements such as Mo are promising candidates. The hot corrosion mechanisms for Mo-based systems differ from those known for Ni-based alloys. Even under sulfate deposits, Na2MoO4 forms which has a melting point of 687 °C and is able to dissolve the surrounding material. In addition, it can form a eutectic with MoO3, which melts at around 500 °C. The corrosion mechanisms of these alloys shift from a sulfate-dominated attack to a molybdate-based one. In this work, the hot corrosion behavior of four Mo-based alloys is investigated in a SO2-containing atmosphere. A temperature regime between 500 and 900 °C was chosen, which covers both the range of Type I and II known from Ni-based alloys but also the pesting regime of Mo-based systems. |