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Fractographic Study of Adhesion Tested Thermal Barrier Coatings Subjected to Isothermal and Cyclic Heat Treatments
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, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Volvo Aero Corporation, Trollhättan.
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2011 (English)In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 10, 195-200 p.Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBC) are used in gas turbines to protect metallic components from high temperature. In the present study adhesion tests have been conducted on APS TBC coated specimens subjected to different heat treatments. Isothermal and cyclic heat treatments have been conducted at temperatures around 1100 °C and the adhesion have been tested using the method described in ASTM C633. The fracture surfaces resulting from the adhesion test have been investigated and the fracture behavior has been characterized. A difference in fracture mechanism between the three heat treatments has been found. The two cyclic heat treatments give fracture in the top coat/bond coat interface while isothermal heat treatment gives fracture in the top coat.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 10, 195-200 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-70541DOI: 10.1016/j.proeng.2011.04.035OAI: oai:DiVA.org:liu-70541DiVA: diva2:440211
Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2017-12-08
In thesis
1. High-temperature degradation of plasma sprayed thermal barrier coating systems
Open this publication in new window or tab >>High-temperature degradation of plasma sprayed thermal barrier coating systems
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Thermal barrier coating systems (TBCs) are used in gas turbines to prevent high-temperature degradation of metallic materials in the combustor and turbine. One of the main concerns regarding TBCs is poor reliability, and accurate life prediction models are necessary in order to fully utilise the beneficial effects of TBCs. This research project aims at developing deeper understanding of the degradation and failure mechanisms acting on TBCs during high temperature exposure, and to use this knowledge to improve life assessments of TBCs. The present work includes a study on the influence of coating interface morphology on the fatigue life of TBCs and a study on the influence of some different heat treatments on the adhesive properties of TBCs.

The influence of coating interface morphology on fatigue life has been studied both experimentally and by modelling. Large interface roughness has been found experimentally to increase fatigue life of TBCs. The modelling work do, to some extent, capture this behaviour. It is evident, from the study, that interface morphology has a large impact on fatigue life of TBCs.

Three thermal testing methods, that degrade TBCs, have been investigated: isothermal oxidation, furnace cycling and burner rig test. The degraded TBCs have been evaluated by adhesion tests and microscopy. The adhesion of TBCs has been found to depend on heat treatment type and length. Cyclic heat treatments, (furnace cycling and burner rig test), lower the adhesion of TBCs while isothermal oxidation increases adhesion. The fracture surfaces from the adhesion tests reveal that failure strongly depends on the pre-existing defects in the TBC.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 49 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1484
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-67885 (URN)LIU–TEK–LIC–2011:23 (Local ID)978-91-7393-165-6 (ISBN)LIU–TEK–LIC–2011:23 (Archive number)LIU–TEK–LIC–2011:23 (OAI)
Presentation
2011-05-27, ACAS, Plan 2, A-huset, Campus Valla, Linköpings universitet, Linköping, 13:15 (Swedish)
Opponent
Supervisors
Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2011-09-27Bibliographically approved

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Eriksson, RobertBrodin, HåkanJohansson, Sten

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