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.
Author details: | 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 |
Title of parent work (English): | Journal of the American Ceramic Society |
Publisher: | Wiley |
Place of publishing: | Hoboken |
Publication type: | Article |
Language: | English |
Year of first publication: | 2019 |
Publication year: | 2019 |
Release date: | 2020/11/04 |
Tag: | CMAS; characterization; synchrotron X-ray refraction radiography; thermal barrier coatings |
Volume: | 102 |
Issue: | 10 |
Number of pages: | 13 |
First page: | 6163 |
Last Page: | 6175 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |