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Evaluation of Internal Cohesion of Plasma-Sprayed Coatings by Cavitation Test: Feasibility Study
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SYSNO ASEP 0538124 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Evaluation of Internal Cohesion of Plasma-Sprayed Coatings by Cavitation Test: Feasibility Study Author(s) Mušálek, Radek (UFP-V) RID, ORCID
Nardozza, E. (IT)
Tesař, Tomáš (UFP-V) ORCID
Medřický, Jan (UFP-V) RIDNumber of authors 4 Source Title Acta Polytechnica. - : České vysoké učení technické - ISSN 1210-2709
Roč. 27, Červen (2020), s. 73-78Number of pages 6 s. Language eng - English Country CZ - Czech Republic Keywords Cavitation damage ; cohesion ; failure analysis ; plasma spray coatings Subject RIV JP - Industrial Processing OECD category Materials engineering R&D Projects GA19-10246S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFP-V - RVO:61389021 DOI 10.14311/APP.2020.27.0073 Annotation Mechanical characterization of plasma-sprayed coatings at microscopic level representsa major challenge due to the presence of numerous inherent microstructural features such as cracks,pores, or splat boundaries, which complicate coatings characterization by conventional testing methods.Need for reliable testing of structural integrity of newly developed multiphase plasma-sprayed coatingsintroduced even more complexity to the testing. In this study, applicability of indirect vibratorycavitation test (adapted from ASTM G32 standard) for such testing was evaluated. Three plasma-sprayed coatings having distinctive microstructures were tested: i) conventional alumina coatingdeposited from coarse powder, ii) hybrid coating deposited by co-spraying of coarse alumina powderand fine yttria-stabilized zirconia (YSZ) suspension, and iii) compact alumina coating deposited fromfine ethanol-based suspension. Differences in the coatings internal cohesion were reflected in differentfailure mechanisms observed within the cavitation crater by scanning electron microscopy and meanerosion rates being i) 280μm/hour, ii) 97μm/hour and iii) 14μm/hour, respectively. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://ojs.cvut.cz/ojs/index.php/APP/article/view/6691/5733
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