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Influence of nozzle configuration and particle size on characteristics and sliding wear behaviour of HVAF-sprayed WC-CoCr coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-8404-8180
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-4201-668x
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-1732-6544
Department of Chemical Engineering Materials Environment, Sapienza University of Rome (ITA).
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2021 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 423, p. 127585-127585, article id 127585Article in journal (Refereed) Published
Abstract [en]

In this study, effect of feedstock particle size and nozzle configuration on deposition, microstructural features, hardness and sliding wear behaviour of high velocity air fuel (HVAF)-sprayed WC-CoCr coatings was evaluated. Three different WC-CoCr powders with nominal particle sizes of 5/20 μm (fine), 5/30 μm (medium) and 15/45 μm (coarse) were sprayed employing a HVAF gun with four distinct DeLaval nozzle configurations involving different lengths and/or exit diameters. Microstructure, phase constitution and mechanical characteristics of the coatings were evaluated using SEM, EDS, XRD and micro indentation testing. Specific wear rate for all the samples was determined under sliding conditions and a comprehensive post wear analysis was conducted. X-ray diffraction analysis showed negligible decarburization in all the HVAF-sprayed coatings. It was shown that decrease in particle size of employed feedstock results in discernible changes in microstructural features of the coatings as well as considerable improvement in their performance. Also, notable changes in wear mechanisms were identified on reducing particle size from coarse to medium or fine. Fine and coarse feedstock powders were found to be sensitive to the type of nozzle used while no major difference was observed in coatings from powders with medium cut size sprayed with different nozzles. 

Place, publisher, year, edition, pages
2021. Vol. 423, p. 127585-127585, article id 127585
Keywords [en]
Particle size, Nozzle configuration, HVAF, WC-CoCr, Sliding wear
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20918DOI: 10.1016/j.surfcoat.2021.127585ISI: 000697566200017Scopus ID: 2-s2.0-85108196054OAI: oai:DiVA.org:hv-20918DiVA, id: diva2:1810747
Funder
Knowledge Foundation, 20180197
Note

Knowledge Foundation, Sweden for project HiPerCOAT (Dnr. 20180197)

Available from: 2023-11-09 Created: 2023-11-09 Last updated: 2023-11-09Bibliographically approved

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Torkashvand, KavehGupta, Mohit KumarBjörklund, StefanBaiamonte, LidiaJoshi, Shrikant V.

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Torkashvand, KavehGupta, Mohit KumarBjörklund, StefanBaiamonte, LidiaJoshi, Shrikant V.
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