Thermal barrier coatings (TBCs) are often applied on the most critical parts of engines, in order to enhance the engine efficiency by allowing higher operation temperatures. During cooling from the operation temperature (1000 °C) to room temperature high stresses develop and ultimately lead to the failure of the TBC.
The primary goal of the research project is to realize and optimize self-healing TBCs for application in aero engines to prolong the lifetime of their components. To this end, a crack-healing mechanism with Mo-Si based dispersed particle acting as a healing agent in the ceramic matrix of a TBC is explored. Upon local fracture of the ceramic matrix and high temperature exposure, the embedded particles react to form a viscous like healing agent, which fills and close the crack.
As the current TBCs do not exhibit any self-repair, the new self-healing TBC will offer a reduction of the number of the TBC replacements during an engine lifetime and enhance the reliability of the critical components.
The SAMBA project is funded by the European Union under its 7th Framework Programme (NMP theme) with project number 309849. The project started on 1 March with a duration of 4 years. The consortium to carry out this project consists of leading European academic and industrial parties in the field of thermal barrier coating design, manufacturing, characterization and lifetime assessment as well as end-users.
The SAMBA project deals with the creation of a new, unique self-healing thermal barrier coating (TBC) for turbines and other thermally loaded structures in order to realize a significant extension of the lifetime of critical high-temperature components. The concept is based on novel Al2O3 coated Mo-Si particles embedded in the TBC layer, typically consisting of yttria-stabilized zirconia. As the current TBCs do not exhibit any self-repair, the new self-healing TBC will offer a reduction of the number of TBC replacements during an engine lifetime and enhance the reliability of the critical components.
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