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- Title
Unveiling Ultra-High Temperature Wear and Indentation Damage Mechanisms of Thermal Barrier Coatings.
- Authors
Bumgardner, Clifton; Li, Xiaodong
- Abstract
Thermal barrier coatings are necessary to protect turbine blades within jet engines from extreme environments that the substrate material may not be capable of withstanding. Therefore, failure of the coating due to wear during its operational lifecycle is a critical event. In order to understand the failure mechanisms of the coating layers, a zirconia-based coating on a nickel alloy substrate was subjected to wear testing to simulate pressure and temperature conditions within a jet engine. Using a Hertzian contact model, the maximum shear and its depth were determined and analyzed in conjunction with the coating material properties and scanning electron microscopy and energy dispersive x-ray spectrometry images. The coupled imaging and contact model analyses made possible the identification of the location and time of delamination and its underlying causes. Our findings provide key insights for the development of more resilient thermal barrier coatings.
- Subjects
THERMAL barrier coating testing; INDENTATION (Materials science); THERMAL stability; EXTREME environments; SCANNING electron microscopy
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2015, Vol 67, Issue 12, p2921
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-015-1622-2