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Cohesion of Dissimilar Splats in Hybrid Plasma-Sprayed Coatings: A Case Study for Al2O3-TiO2
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SYSNO ASEP 0566157 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Cohesion of Dissimilar Splats in Hybrid Plasma-Sprayed Coatings: A Case Study for Al2O3-TiO2 Author(s) Mušálek, Radek (UFP-V) RID, ORCID
Tesař, Tomáš (UFP-V) ORCID
Dudík, J. (SK)
Medřický, Jan (UFP-V) RID
Čech, J. (CZ)
Lukáč, František (UFP-V) ORCIDNumber of authors 6 Source Title Journal of Thermal Spray Technology. - : Springer - ISSN 1059-9630
Roč. 31, č. 6 (2022), s. 1869-1888Number of pages 20 s. Language eng - English Country US - United States Keywords Al2O3-TiO2 ; atmospheric plasma spray (APS) ; cohesion ; hybrid plasma torch ; mechanical properties ; suspension spraying ; water-stabilized plasma Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects GA19-10246S GA ČR - Czech Science Foundation (CSF) EF16_019/0000778 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000785589700001 EID SCOPUS 85129559368 DOI 10.1007/s11666-022-01401-4 Annotation Hybrid plasma spraying combines deposition of coarse dry powders and liquids, i.e., suspensions or solutions, thus expanding range of microstructures and functional properties achievable by thermal spraying. One of the crucial questions is how the miniature liquid-originated splats bond to the coarse splats deposited from powders and how their interaction influences the overall coating integrity. In this paper, cohesion of hybrid coatings was studied on model coatings deposited from Al2O3 powder and TiO2 suspension. Spraying distance and deposition temperature were varied as these two process variables influence the bonding between the splats in both conventional and liquid plasma spraying and the same may be expected for hybrid plasma spraying. Coatings without additional miniature splats were also prepared for comparison. Cohesion of the coatings was studied by four independent mechanical tests using different loading modes, namely tensile adhesion/cohesion test, cavitation test, conventional hardness test and instrumented indentation test. Results showed that interfaces between the dissimilar splats are not equivalent and that the coating strength greatly depends not only on the presence of the miniature TiO2 phase but also on the loading mode and involved interaction volume. When compared to the reference conventional coating deposited from Al2O3 powder, hybrid coatings were found to be less durable in adhesion/cohesion test but more durable in cavitation test and comparable in both hardness tests. Miniature TiO2 splats tended to be more strongly bonded to the above-laying Al2O3 splats than to the below-laying ones as large Al2O3 droplets possess greater ability to partially remelt previously deposited TiO2 than vice versa and even to form Al2TiO5 compound. Importance of splats deposition sequence and their remelting ability were confirmed also by the simplified analytical model. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2023 Electronic address https://link.springer.com/article/10.1007/s11666-022-01401-4
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