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Microstructure-based Life Prediction of Thermal Barrier Coatings
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The widespread use of thermal barrier coatings (TBC) in gas turbines stresses the importance of accurate life prediction models for TBCs. During service, the TBC may fail due to thermal fatigue or through the formation of thermally grown oxides (TGOs). The current paper presents a Thermo-Calc/Dictra-based approach to life prediction of isothermally oxidised atmospheric plasma sprayed (APS) TBCs. The β-phase depletion of the coating was predicted and compared to life prediction criteria based on TGO thickness and Al content in the coating. All tried life models underestimated the life of the coating where the β-depletion-based model was the most conservative.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. Vol. 592-593, 413-416 p.
Keyword [en]
Thermal barrier coating, TBC, life prediction, isothermal oxidation, interdiffusion
National Category
Engineering and Technology Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-95554DOI: 10.4028/www.scientific.net/KEM.592-593.413ISI: 000336694400091OAI: oai:DiVA.org:liu-95554DiVA: diva2:635988
Conference
THERMEC,2-6 December, 2013, Las Vegas, USA
Available from: 2013-07-08 Created: 2013-07-08 Last updated: 2014-12-10Bibliographically approved
In thesis
1. Thermal Barrier Coatings: Durability Assessment and Life Prediction
Open this publication in new window or tab >>Thermal Barrier Coatings: Durability Assessment and Life Prediction
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Thermal barrier coating (TBC) systems are coating systems containing a metallic bond coat and a ceramic top coat. TBCs are used in gas turbines for thermal insulation and oxidation resistance. Life prediction of TBCs is important as high-temperature exposure degrades the coatings through mechanisms such as thermal fatigue and the formation and growth of thermally grown oxides (TGOs). This thesis presents research on durability assessment and life prediction of air plasma sprayed TBCs.

The adhesion of thermal barrier coatings subjected to isothermal oxidation, thermal cycling fatigue and thermal shock was studied. The adhesion strength and fracture characteristics were found to vary with heat treatment type.

The influence of interdiffusion between bond coat and substrate was studied on TBCs deposited on two different substrates. The thermal fatigue life was found to differ between the two TBC systems. While fractography and nanoindentation revealed no differences between the TBC systems, the oxidation kinetics was found to differ for non-alumina oxides.

The influence of bond coat/top coat interface roughness on the thermal fatigue life was studied; higher interface roughness promoted longer thermal fatigue life. Different interface geometrieswere tried in finite element crack growth simulations, and procedures for creating accurate interface models were suggested.

The influence of water vapour and salt deposits on the oxidation/corrosion of a NiCoCrAlY coating and a TBC were studied. Salt deposits gave thicker TGOs and promoted an Y-rich phase. The effect of salt deposits was also evident for TBC coated specimens.

A microstructure-based life model was developed using the Thermo-Calc software. The model included coupled oxidation-diffusion, as well as diffusion blocking due to the formation of internal oxides and pores. The model predicted Al-depletion in acceptable agreement with experimental observations.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 65 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1527
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-96816 (URN)978-91-7519-569-8 (ISBN)
Public defence
2013-10-18, ACAS, Hus A, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency
Available from: 2013-08-27 Created: 2013-08-27 Last updated: 2014-01-07Bibliographically approved

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Eriksson, RobertYuan, KangJohansson, StenPeng, Ru

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