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Fracture Mechanical Modelling of a Plasma Sprayed TBC System
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology. Siemens Industrial Turbomachinery AB, Finspång, Sweden.
Siemens Industrial Turbomachinery AB, Finspång, Sweden.
Siemens Industrial Turbomachinery AB, Finspång, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology. Siemens Industrial Turbomachinery AB, Finspång, Sweden.
2009 (English)In: Advanced Ceramic Coatings and Interfaces IV / [ed] Dongming Zhu and Hua-Tay Lin, Westerville, OH, United States: American Ceramic Society Inc. , 2009, Vol. 30, no 3, 113-124 p.Conference paper, Published paper (Refereed)
Abstract [en]

A thermal barrier coating (TBC) system subjected to thermal cycling will develop a microcrack partem near the interface between the metallic bond coat and the ceramic top coat. These small cracks link up and form internal TBC delaminations during repeated heating / cooling. After a longer time period, the internal delamination cracks will form a larger spallation damage, where the TBC is detached from the underlying material. Since cracks are initiated in multiple sites of the thermal barrier coating, the damage is initially considered to be governed by local stress conditions. The purpose of the present work is to compare experimental data with predictions of a physically based fatigue life model. The present study has been performed on plasma-sprayed TBCs where the interface geometry has been varied. In the present work, calculation of fatigue life is done for a number of cases under thermal fatigue loading. Different interface geometries are compared in order to understand the influence of variations in the TC/BC interface roughness on oxidation behaviour and thermal fatigue life. Thermal fatigue tests indicate that an increased surface roughness is beneficial from a fatigue life point of view.

Place, publisher, year, edition, pages
Westerville, OH, United States: American Ceramic Society Inc. , 2009. Vol. 30, no 3, 113-124 p.
Series
Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; 3
Keyword [en]
Fracture mechanical modelling, thermal barrier coating, plasma spraying, thermal cycling, metallic bond coat
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-57007DOI: 10.1002/9780470584293.ch12ISI: 000281124900012ISBN: 978-0-470-45753-5 (print)OAI: oai:DiVA.org:liu-57007DiVA: diva2:324089
Conference
33rd International Conference on Advanced Ceramics and Composites, Daytona Beach, FL, USA, January 18-23, 2009
Available from: 2010-06-14 Created: 2010-06-09 Last updated: 2016-05-17Bibliographically approved
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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Brodin, HåkanEriksson, RobertSjöström, Sören

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