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Multi-scale failure mechanisms of thermal barrier coating systems

Seiler, Philipp, Bäker, Martin, Rösler, Joachim (2013) Multi-scale failure mechanisms of thermal barrier coating systems. Computational Materials Science, 80 . pp. 27-34. ISSN 0927-0256. (doi:10.1016/j.commatsci.2013.04.028) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:89807)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL
https://doi.org/10.1016/j.commatsci.2013.04.028

Abstract

Thermal barrier coating systems are well-established on top of present gas turbine components. They consist of different coating layers: the bond-coat (BC), the thermal barrier coating (TBC), and the thermally grown oxide (TGO), which is formed during operation. The complex failure mechanisms of the coating systems are not fully understood, yet. Therefore, a simplified model system is analysed to focus on the influence of bond-coat creep and segmentation cracks on the formation and propagation of delaminations.

Two finite element (FE) models are discussed in this paper and compared to experimental results: (i) a micro-scale model describes the formation of initial delaminations and (ii) a segmentation crack model analyses the interaction between delaminations and segmentation cracks on the meso-scale.

It was found that initial delaminations develop mainly in the valley of asperities at the TGO/TBC interface, both in fast and slow creeping bond-coat materials. Segmentation cracks can be found in the coating system from the first thermal cycle. They promote the development of delaminations between two segmentation cracks. The propagation of delaminations is not stopped in the TBC and the delaminations grow together with the segmentation cracks. In conclusion, a possible scenario of TBC failure in the analysed model system is presented.

Item Type: Article
DOI/Identification number: 10.1016/j.commatsci.2013.04.028
Uncontrolled keywords: Finite elements; Plasma spraying; Failure mechanism; Multi-scale
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Amy Boaler
Date Deposited: 16 Aug 2021 12:26 UTC
Last Modified: 16 Nov 2021 10:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/89807 (The current URI for this page, for reference purposes)
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