| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Sandphobic Thermal/Environmental Barrier Coatings
|
| Presentation Title |
Development of Novel CMAS/VA Resistant TBCS: Influence of Chemical Composition and the Microstructure |
| Author(s) |
Ravisankar Naraparaju, Juan Gomez Chavez, Christoph Mikulla, Mohammad Rizviul Kabir, Philipp Niemeyer, Peter Mechnich, Uwe Schulz |
| On-Site Speaker (Planned) |
Ravisankar Naraparaju |
| Abstract Scope |
The CMAS associated degradation of 7YSZ TBC layers is one of the serious problems in aero engines that operate in dusty environments. The most common infiltration mitigation strategies focus on using a reactive material that upon interaction with molten CMAS glass induces its crystallization sealing the porous features and stopping any further infiltration. However, chemical composition of CMAS/VA and the TBC microstructure are highly influential parameters in case of CMAS/TBC interaction. Novel TBCs such as GZO and 65YZ coatings were applied by means of EB-PVD method and their interactions with various CMAS/VA were studied in detail. It was found out that the reaction products were heavily dependent upon the CMAS chemistry. Infiltration tests on various TBC microstructures have proven that the microstructure can be tailored such that the CMAS infiltration kinetics can be hampered. Simultaneously, these results are well supported by microstructural FEM simulations using ABAQUS on the infiltration kinetics. |