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Surface characteristics investigation of HVAF sprayed cermet coatings
Birla Institute of Technology and Science-Pilani (BITS-Pilani), Pilani, India.
Østfold University College, Fredrikstad, Norway.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-6929-3310
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-7787-5444
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2019 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 493, p. 956-962Article in journal (Refereed) Published
Abstract [en]

Superhydrophobic surfaces that are durable and can be easily manufactured are of high interest for many industrial applications. Measuring and understanding roughness in the context of superhydrophobicity is the first step in creation of a surface that does not require activation to be hydrophobic. In this study, the as sprayed surface of different cermet (WC-10Co4Cr and Cr3C2-25Ni20Cr) coatings produced by High Velocity Air Fuel (HVAF) spraying – have been investigated to assess their wetting ability. In order to address the challenges raised by the specific roughness profile of thermal spray surfaces, two routes have been adapted and used for surface characteristics analysis i.e. statistical and fractal. Results show that both methods have a strong correlation to wettability. Roughness parameters Sdq and Sdr show good correlation with advancing contact angle. Hausdorff Dimension of a sub-micrometer profile shows good relation with the contact angle and provides information for state of the droplet. To determine how to increase the contact angle of the coating surface, coating parameters such as CGS Density have been correlated with Hausdorff Dimension. Both methods provide good understanding in terms of wettability of rough cermet surfaces. © 2019 Elsevier B.V.

Place, publisher, year, edition, pages
2019. Vol. 493, p. 956-962
Keywords [en]
Air; Cermets; Contact angle; Fractals; Hydrophobicity; Sprayed coatings; Statistical methods; Surface roughness, Advancing contact angle; Cermet coatings; Fractal analysis; High velocity air fuels; Hydrophobic surfaces; Roughness parameters; Super-hydrophobic surfaces; Surface characteristics, Wetting
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-14483DOI: 10.1016/j.apsusc.2019.07.079Scopus ID: 2-s2.0-85069570632OAI: oai:DiVA.org:hv-14483DiVA, id: diva2:1357081
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-11-12Bibliographically approved

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Lyphout, ChristopheNylén, PerMarkocsan, Nicolaie

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