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Thermophysical properties of YSZ and YCeSZ suspension plasma sprayed coatings having different microstructures
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SYSNO ASEP 0476039 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thermophysical properties of YSZ and YCeSZ suspension plasma sprayed coatings having different microstructures Author(s) Sokołowski, P. (PL)
Björklund, S. (SE)
Mušálek, Radek (UFP-V) RID, ORCID
Candidato, Jr., R.T. (FR)
Pawłowski, L. (FR)
Nait-Ali, B. (FR)
Smith, D. (FR)Source Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 318, May (2017), s. 28-38Number of pages 11 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 Thermal Barrier Coatings (TBC) ; Suspension Plasma Spraying ; Thermal conductivity ; Specific heat ; Thermal dilatation ; Response function method 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 000402356100005 EID SCOPUS 85013649265 DOI 10.1016/j.surfcoat.2017.02.054 Annotation The paper describes the ceramic top coats of Thermal Barrier Coatings (TBC) obtained by Suspension Plasma Spraying (SPS). The spray process realized with different plasma torches allowed obtaining coatings having different morphology, namely, columnar-like and two-zones microstructure. The microstructures influenced the thermal transport properties of TBCs. The study analyses the thermophysical properties of yttria and yttria-with ceria- stabilized zirconia coatings, i.e. YSZ and YCeSZ, respectively. The spray processes were realized with the use of three different plasma spray torches: (i) SG-100, (ii) Axial III and (iii) hybrid WSP one. The deposition parameters were designed for each plasma torch separately. The microstructure of coatings was then analyzed using Optical and Scanning Electron Microscopy i.e.OMand SEM, respectively. The thermophysical properties of the coatings such as density, specific heat and thermal dilatation were measured using gas pycnometry, calorimetry and dilatometry methods respectively. The collected datawere used, togetherwith thermal diffusivity foundwith the use of laser flashmethod, to calculate the thermal conductivity of the deposits. The thermal conductivities of coatings were in a range from 0.63 to 0.99 [W/m·K] for YSZ samples and between 0.82 and 1.37 [W/m·K] in the case of YCeSZ coatings. Thermal transport properties were found to be influenced by the coatings porosity and their microstructure. Finally, the thermal conductivity values were successfully validated using response function method, which can be an alternative to complex FEM methods. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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