Original title: Suspension plasma spraying of sub-stoichiometric titania by hybrid water/argon stabilized plasma torch
Authors: Mušálek, Radek ; Ctibor, Pavel ; Medřický, Jan ; Tesař, Tomáš ; Kotlan, Jiří ; Lukáč, František
Document type: Papers
Conference/Event: METAL 2017: International Conference on Metallurgy and Materials /26./, Brno (CZ), 20170524
Year: 2018
Language: eng
Abstract: In this study, suspension plasma spraying of sub-stoichiometric titania was attempted using hybrid water/argon stabilized plasma torch (WSP-H). Porous coatings with fine cauliflower-like columnar microstructure were successfully deposited in two separate experiments with different power levels of the plasma torch. In both cases, high solid-load content (40 wt. %) of the water-based suspension resulted in considerable coating thickness increase per deposition cycle. Coating annealing and partial remelting of the surface asperities were also achieved by additional pass of plasma torch in front of the coating surface. According to X-ray diffraction, all coatings consisted dominantly of rutile phase. Detailed microscopic observation of the as-sprayed and annealed deposits showed that the local coloration of the coating (ranging from dark blue to beige) was driven by the local overheating of the rough coating surface which could also promote the oxygen intake. Moreover, sample annealing was also observed to increase the sample reflectivity as observed by UV-VIS-NIR scanning spectrophotometry
Keywords: Liquid feedstock; Plasma spraying; Suspension; Thermal spraying; Titania; WSP-H
Project no.: GA15-12145S (CEP)
Funding provider: GA ČR
Host item entry: METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings, ISBN 978-80-87294-79-6

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0284348

Permalink: http://www.nusl.cz/ntk/nusl-375644

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Research > Institutes ASCR > Institute of Plasma Physics
Conference materials > Papers
 Record created 2018-06-19, last modified 2020-03-27

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