| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Sustainability of High Temperature Alloys
|
| Presentation Title |
Novel Environmentally Friendly Cr-Si Slurry Coatings for Turbine Applications |
| Author(s) |
Michael Kerbstadt, Emma Marie Hamilton White, Kan Ma, Alexander Knowles, Mathias Christian Galetz |
| On-Site Speaker (Planned) |
Michael Kerbstadt |
| Abstract Scope |
Ni-based superalloys are commonly used in hot sections of aerospace engines, where hot corrosion, due to the deposition of Na2SO4, occurs in the temperature range of 650-950°C. For hot corrosion protection, Cr-based diffusion coatings are applied by pack cementation, where the components are usually fully embedded into a powder mixture which is energy- and labor-intensive. As an alternative, novel Cr-Si slurry coatings have been successfully developed and demonstrated at the industrial scale where the coatings are applied by spray deposition. Hot corrosion tests (4 mg/cm2 Na2SO4 deposition and exposure at 700°C/900°C for 300h in 0.1%-SO2-air) of these Cr-Si slurry coatings showed superior corrosion resistance even to pack cementation coatings. This sustainable slurry process offers several advantages over the pack cementation process: reduced waste, local recoating for repairs, avoidance of hazardous substances such as halide activators, and even longer part lifetimes through improved hot corrosion resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Surface Modification and Coatings, Sustainability |