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Influence of topcoat-bondcoat interface roughness on stresses and lifetime in Thermal Barrier Coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-4201-668X
University West, Department of Engineering Science. (PTW)
University West, Department of Engineering Science, Division of Production Engineering. (PTW)ORCID iD: 0000-0001-7787-5444
2013 (English)In: Proceedings of the International Thermal Spray Conference / [ed] Editor: Rogerio S. Lima, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Georg Mauer, André McDonald, and Filofteia-Laura, ASM International, 2013, p. 596-601Conference paper, Published paper (Refereed)
Abstract [en]

Failure in Atmospheric Plasma Sprayed (APS) Thermal Barrier Coatings (TBCs) is associated with the thermomechanical stresses developing due to the Thermally Grown Oxide (TGO) layer growth and thermal expansion mismatch during thermal cycling. The interface roughness has been shown to play a major role in the development of these induced stresses and lifetime of TBCs. Modeling has been shown as an effective tool to understand the effect of interface roughness on induced stresses. In previous work done by the research group, it was observed that APS bondcoats performed better than the bondcoats sprayed with High Velocity OxyFuel (HVOF) process which is contrary to the present literature data. The objective of this work was to understand this observed difference in life-time with the help of finite element modeling by using real surface topographies. Different TGO layer thicknesses were evaluated. The modeling results were also compared with existing theories established on simplified sinusoidal profiles published in earlier works. It was shown that modeling can be used as an effective tool to understand the stress behavior in TBCs with different roughness profiles.

Place, publisher, year, edition, pages
ASM International, 2013. p. 596-601
National Category
Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6733Scopus ID: 2-s2.0-84907083293ISBN: 978-163266681-9 (print)OAI: oai:DiVA.org:hv-6733DiVA, id: diva2:751616
Conference
International Thermal Spray Conference and Exposition: Innovative Coating Solutions for the Global Economy, ITSC 2013; Busan; South Korea; 13 May 2013 through 15 May 2013; Code 107529
Available from: 2014-10-01 Created: 2014-10-01 Last updated: 2019-01-04Bibliographically approved

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Gupta, Mohit KumarNylén, Per

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