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The microstructural studies of suspension plasma sprayed zirconia coatings with the use of high-energy plasma torches
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SYSNO ASEP 0476027 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The microstructural studies of suspension plasma sprayed zirconia coatings with the use of high-energy plasma torches Author(s) Sokołowski, P. (PL)
Nylen, P. (SE)
Mušálek, Radek (UFP-V) RID, ORCID
Łatka, L. (PL)
Kozerski, S. (PL)
Dietrich, D. (DE)
Lampke, T. (DE)
Pawłowski, L. (FR)Source Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 318, May (2017), s. 250-261Number of pages 12 s. Publication form Print - P Action International Meeting on Thermal Spraying (RIPT)/7./ Event date 09.12.2015 - 11.12.2015 VEvent location Limoges Country FR - France Event type WRD Language eng - English Country CH - Switzerland Keywords Water-stabilized plasma (WSP) ; Gas-stabilized plasma (GSP) ; Suspension injection ; Columnar microstructure ; Two-zones microstructure ; Electron backscatter diffraction Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects GA15-12145S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000402356100029 EID SCOPUS 85016063934 DOI 10.1016/j.surfcoat.2017.03.025 Annotation The presented studies are focused on the microstructure characterization of zirconia-based coatings deposited by two types of high-energy plasma torches: (i) Axial III, and, (ii) hybrid version of Water-Stabilized Plasma (WSP) torch. The suspensions were formulated using solid dispersed phase of: (i) zirconia stabilized with 14 wt of Y2O3 and (ii) zirconia stabilized with 24 wt% of CeO2 + 2.5 wt% of Y2O3 and continuous phase of water with ethanol. The spray process parameters were optimized for each plasma set-up individually. The in-flight observations (shadowgraphy) were performed to optimize the injection of the liquid feedstock into the plasma jet. Then the coatings morphology and coating/substrate interface were characterized using conventional light microscopy and scanning electron microscopy (SEM). The results showed that through the change of deposition parameters various coatings microstructures could be obtained, in particular columnar and two-zones structures. The EDS/EDX and XRD studies showed that there was no significant change in chemical/phase composition of zirconia material before and after spraying. Electron backscatter diffraction (EBSD) method allowed to analyze the grain size in the coating microstructure as well as crystallographic orientation of individual grains. The results showed that coatings were characterized by submicrometric microstructure what corresponded to the size of powder particles used to formulate suspension. No texture was observed in the coatings microstructure. The surface topography analysis which was performed by confocal scanning laser microscopy (CSLM) and Shape From Shading (SFS) technique proved the great influence of suspension concentration on the coating structure. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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