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| Home > Publications database > Behavior of micro-scaled composite TBCs under corrosive attack by CMAS deposits |
| Conference Presentation (Plenary/Keynote) | FZJ-2019-01191 |
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2018
Abstract: Facing the demands on efficiency and operational flexibility of gas turbines thermal barrier coatings (TBCs) are being developed with considerable progress to allow increased turbine inlet temperatures. Advanced ceramics were identified in terms of the relevant materials properties as e.g. high temperature phase stability, thermal conductivity, thermal expansion, fracture toughness, etc. Based on this data, typical approaches to improve TBC capabilities comprise multi-layer coating designs where individual layers of advanced materials are intended to contribute their best-ranked functionality to withstand the harsh environments.Since some years, in addition to the extreme thermo-mechanical loads also degradation due to meltable deposits from various sources has become a persistent challenge in the hottest part of the gas turbines. The corrosive attack from CaO-MgO-Al2O3-SiO2 related deposits (CMAS) in most cases imposes major changes on microstructure and chemistry of the outer coating layers which also affect their thermo-mechanical properties. Recent results are reviewed, where micro-scaled composites were effectively able to counter-balance unfavourable effects from corrosive degradation and provide superior performance compared to single phase materials intended for CMAS mitigation.
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