Cohesion of Dissimilar Splats in Hybrid Plasma-Sprayed Coatings: A Case Study for Al2O3-TiO2

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F22%3A00566157" target="_blank" >RIV/61389021:_____/22:00566157 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/22:00360132

Result on the web

<a href="https://link.springer.com/article/10.1007/s11666-022-01401-4" target="_blank" >https://link.springer.com/article/10.1007/s11666-022-01401-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11666-022-01401-4" target="_blank" >10.1007/s11666-022-01401-4</a>

Result language

angličtina

Original language name

Cohesion of Dissimilar Splats in Hybrid Plasma-Sprayed Coatings: A Case Study for Al2O3-TiO2

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20506 - Coating and films

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Thermal Spray Technology

ISSN

1059-9630

e-ISSN

1544-1016

Volume of the periodical

31

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

20

Pages from-to

1869-1888

UT code for WoS article

000785589700001

EID of the result in the Scopus database

2-s2.0-85129559368