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Thermal barrier coatings on surfaces with micro-machined roughness profiles

Seiler, P., Bäker, M., Rösler, J., Schweda, M., Beck, T. (2011) Thermal barrier coatings on surfaces with micro-machined roughness profiles. In: Thermal Spray 2011: Proceedings of the International Thermal Spray Conference (September 27-29, 2011, Hamburg, Germany). 276. pp. 572-574. Verlag für Schweißen und verwandte Verfahren, DVS-Verlag;, Düsseldorf ISBN 978-3-87155-268-7. (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:89809)

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://www.tib.eu/de/suchen/id/tema%3ATEMA2011110...

Abstract

Thermal barrier coating systems are used to enhance the temperature resistance of hot section components in gas turbines. The coatings protect the underlying nickel based components and consist of the bond coat (BC) the thermal barrier coating (TBC) and a thermally grown oxide (TGO) between the BC and TBC. The coating systems fail in service at or near the TBC/TGO interface. To study the failure mechanisms a simplified coating system is introduced which consists of a MCrAlY bond-coat material as the substrate, a TGO, and ayttria-stabilised zirconia TBC as a topcoat. The TBC is applied by atmospheric plasma spraying on top of specimens with defined roughness profiles, manufactured by a micromachining process. The main advantage of micro-machining is a defined interfacial roughness between the TBC and the BC in contrast to sandblasted specimens. Furthermore, a FEM simulation of the coating system was developed which approximates the interface by sinusoidal functions. This simplified model system and additional FEM calculations show the influence of varying the interfacial roughness between the BC and the TBC.

Item Type: Conference or workshop item (Paper)
Uncontrolled keywords: Thermal insulation layer; gas turbine blade; roughness; atmospheric plasma spraying; micromechanical processing; temperature resistance; nickel alloy; oxide; coated material; finite element method; coating method; FEM simulation; adhesive strength
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 14:13 UTC
Last Modified: 16 Nov 2021 10:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/89809 (The current URI for this page, for reference purposes)
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