About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Understanding and Mitigating High Temperature Corrosion Processes Through Synergistic Integration of Experimental, Computational and Manufacturing Techniques
|
| Presentation Title |
Development of Low Temperature Sulphidation Resistant Coatings in Aerospace Environments |
| Author(s) |
Jonathan Leggett |
| On-Site Speaker (Planned) |
Jonathan Leggett |
| Abstract Scope |
Development of low temperature environmental coatings for turbine blades
Turbine blades, used in gas turbine engines, operate under a range of mechanical and environmental conditions. Traditionally the life of these components was limited by high temperature creep and oxidation which led to introduction of beta nickel aluminides on aerofoils. To improve turbine efficiency, temperatures in the core increased along with regions of turbine blades which were traditionally much cooler. The increase in blade temperature exposed areas beneath the platform to environmental attack. The initial assumption at the time was that pitting led to a fatigue crack. Preventing blade failures was initially based on service sampling, which lacked predictive capability. The work led to creation of a standardised test methodology from which first generation shank coatings were developed and implemented. Over time it became clear that the assumptions made about the mechanisms were not as simple. By utilising improved mechanistic understanding second and third generation coating systems have been developed to mitigate environmental degradation across a range of temperatures and alloys.
The work presented reviews the approach taken to try to mitigate shank and firtree degradation modes. |