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Evaluating the toughness of APS and HVOF-sprayed Al2O3-ZrO2-coatings by in-situ- and macroscopic bending
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SYSNO ASEP 0489513 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evaluating the toughness of APS and HVOF-sprayed Al2O3-ZrO2-coatings by in-situ- and macroscopic bending Author(s) Kiilakoski, J. (FI)
Mušálek, Radek (UFP-V) RID, ORCID
Lukáč, František (UFP-V) ORCID
Koivuluoto, H. (FI)
Vuoristo, P. (FI)Source Title Journal of the European Ceramic Society. - : Elsevier - ISSN 0955-2219
Roč. 38, č. 4 (2018), s. 1908-1918Number of pages 11 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Thermal spray ; Al2O3-ZrO2 ; Toughening ; Fracture ; Mechanical testing Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000424716700112 EID SCOPUS 85035355737 DOI 10.1016/j.jeurceramsoc.2017.11.056 Annotation Thermally-sprayed ceramic coatings are commonly used in applications where high wear and corrosion resistance are essential. However, their inherently low toughness and resistance to impacts often limit their use. In bulk ceramics, the toughening effect of ZrO2 has been successfully implemented in different compositions of Al2O3-ZrO2. Successful toughening leads to increased wear resistance and higher reliability. In this study, APS-and HVOF-sprayed Al2O3-40ZrO(2) coatings were characterized with SEM and XRD techniques. The toughness of the coatings was evaluated by measuring their strain tolerance with in-situ (SEM) three-point-bending and macroscopic four-point bending with acoustic emission instrumentation. The APS-coatings had a higher strain to-fracture but failed abruptly. In HVOF-coatings, the cracking commenced earlier but proceeded slower with more crack deflections. The observed behaviour is likely to derive from the coarser microstructure of the APS-coatings, which allows strain distribution in a larger area unlike the finer structure with a lesser melting degree of the HVOF-coatings. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019
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