Evolution of porosity, crack density, and CMAS penetration in thermal barrier coatings subjected to burner rig testing
- Degradation of thermal barrier coatings (TBCs) in gas-turbine engines due to calcium-magnesium-aluminosilicate (CMAS) glassy deposits from various sources has been a persistent issue since many years. In this study, state of the art electron microscopy was correlated with X-ray refraction techniques to elucidate the intrusion of CMAS into the porous structure of atmospheric plasma sprayed (APS) TBCs and the formation and growth of cracks under thermal cycling in a burner rig. Results indicate that the sparse nature of the infiltration as well as kinetics in the burner rig are majorly influenced by the wetting behavior of the CMAS. Despite the obvious attack of CMAS on grain boundaries, the interaction of yttria-stabilized zirconia (YSZ) with intruded CMAS has no immediate impact on structure and density of internal surfaces. At a later stage the formation of horizontal cracks is observed in a wider zone of the TBC layer.
Verfasserangaben: | Daniel Emil MackORCiDGND, Rene LaquaiORCiD, Bernd Mueller, Oliver Helle, Doris SeboldORCiD, Robert VassenORCiD, Giovanni BrunoORCiDGND |
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DOI: | https://doi.org/10.1111/jace.16465 |
ISSN: | 0002-7820 |
ISSN: | 1551-2916 |
Titel des übergeordneten Werks (Englisch): | Journal of the American Ceramic Society |
Verlag: | Wiley |
Verlagsort: | Hoboken |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2019 |
Erscheinungsjahr: | 2019 |
Datum der Freischaltung: | 04.11.2020 |
Freies Schlagwort / Tag: | CMAS; characterization; synchrotron X-ray refraction radiography; thermal barrier coatings |
Band: | 102 |
Ausgabe: | 10 |
Seitenanzahl: | 13 |
Erste Seite: | 6163 |
Letzte Seite: | 6175 |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer Review: | Referiert |