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Thermal Conductivity in Suspension Sprayed Thermal Barrier Coatings: Modeling and Experiments
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-1897-0171
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-4087-6467
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-2857-0975
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-7787-5444
2017 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 26, no 1-2, 71-82 p.Article in journal (Refereed) Published
Abstract [en]

Axial suspension plasma spraying (ASPS) can generate microstructures with higher porosity and pores in the size range from submicron to nanometer. ASPS thermal barrier coatings (TBC) have already shown a great potential to produce low thermal conductivity coatings for gas turbine applications. It is important to understand the fundamental relationships between microstructural defects in ASPS coatings such as crystallite boundaries, porosity etc. and thermal conductivity. Object-oriented finite element (OOF) analysis has been shown as an effective tool for evaluating thermal conductivity of conventional TBCs as this method is capable of incorporating the inherent microstructure in the model. The objective of this work was to analyze the thermal conductivity of ASPS TBCs using experimental techniques and also to evaluate a procedure where OOF can be used to predict and analyze the thermal conductivity for these coatings. Verification of the model was done by comparing modeling results with the experimental thermal conductivity. The results showed that the varied scaled porosity has a significant influence on the thermal conductivity. Smaller crystallites and higher overall porosity content resulted in lower thermal conductivity. It was shown that OOF could be a powerful tool to predict and rank thermal conductivity of ASPS TBCs.

Place, publisher, year, edition, pages
2017. Vol. 26, no 1-2, 71-82 p.
Keyword [en]
finite element modeling, microstructure, OOF2, suspension plasma spraying, thermal barrier coatings, thermal conductivity
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-10417DOI: 10.1007/s11666-016-0503-8ISI: 000392060300007OAI: oai:DiVA.org:hv-10417DiVA: diva2:1060314
Conference
ITSC 2016, International Thermal Spray Conference, Shanghai, P.R. China, May 10-12, 2016
Available from: 2016-12-28 Created: 2016-12-28 Last updated: 2017-05-15Bibliographically approved

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Ganvir, AshishKumara, ChamaraGupta, Mohit KumarNylen, Per
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