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Experimental visualization of microstructure evolution during suspension plasma spraying of thermal barrier coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-1897-0171
Innovnano Materials, Coimbra, Portugal.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
Treibacher Industries AG, Althofen, Austria.
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2019 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 39, no 2-3, p. 470-481Article in journal (Refereed) Published
Abstract [en]

This paper investigates the evolution of microstructure of thermal barrier coatings (TBCs) produced by suspension plasma spraying (SPS) through a careful experimental study. Understanding the influence of different suspension characteristics such as type of solvent, solid load content and median particle size on the ensuing TBC microstructure, as well as visualizing the early stages of coating build-up leading to formation of a columnar microstructure or otherwise, was of specific interest. Several SPS TBCs with different suspensions were deposited under identical conditions (same substrate, bond coat and plasma spray parameters). The experimental study clearly revealed the important role of suspension characteristics, namely surface tension, density and viscosity, on the final microstructure, with study of its progressive evolution providing invaluable insights. Variations in suspension properties manifest in the form of differences in droplet momentum and trajectory, which are found to be key determinants governing the resulting microstructure (e.g., lamellar/vertically cracked or columnar).

Place, publisher, year, edition, pages
2019. Vol. 39, no 2-3, p. 470-481
Keywords [en]
Suspension plasma spraying, Thermal barrier coatings, Droplet momentum, Columnar microstructure, Microstructure evolution
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-12948DOI: 10.1016/j.jeurceramsoc.2018.09.023ISI: 000450379400042Scopus ID: 2-s2.0-85053889817OAI: oai:DiVA.org:hv-12948DiVA, id: diva2:1259062
Funder
Region Västra Götaland, RUN 612-0974-13Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2018-12-20Bibliographically approved

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Ganvir, AshishMarkocsan, NicolaieJoshi, Shrikant V.

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