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Sliding wear behaviour of the WC-based HVAF coatings: effect of load and sliding distance
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2020 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Glidförslitning hos WC-baserade HVAF-beläggningar : belastningseffekt och glidavstand (Swedish)
Abstract [en]

HVAF-sprayed tungsten carbide based composite coatings are among the most popular evolving wear resistant layers. There are several tests to assess behaviour of these coatings in different contact environments. Pin-on-disk is one of the most common tests which is being employed to assess sliding wear behaviour of different materials. In this test there are several effective parameters, by which the result can be affected. Load and sliding distance are some of the determinative factors. This study aims to establish a good understanding of the influence of these parameters on wear performance of HVAF-sprayed WC-based coatings. The effect of applied normal load and sliding distance for the WC-Co-Cr and WC-FeCrAl coatings are studied under the room temperature conditions. The results showed that the friction coefficient and the specific wear rate decreased as the normal load increased from 20N to 40N for the WC-Co-Cr coatings. The formation of protective tribo-oxide layers under the high applied loads could be the reason for the decrease in the wear of WC-Co-Cr coatings. Increase in the sliding distance also resulted in the decrease of the specific wear rate of the WC-Co-Cr coatings due to formation of more stable tribo-oxides on the worn surfaces of the WC-Co-Cr coatings. For the WC-FeCrAl coatings, the friction coefficient and the specific wear rate displayed increasing trend with increase in the normal load. The formation of the hard and brittle oxides led to dominance of the fracture-assisted abrasive wear mechanism compared to oxidative wear in WC-FeCrAl coatings.

Place, publisher, year, edition, pages
2020. , p. 33
Keywords [en]
Abrasive Wear, Wc-coatings, protective oxides, specific wear-rate, brittle oxides
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hv:diva-16085Local ID: EXM902OAI: oai:DiVA.org:hv-16085DiVA, id: diva2:1505122
Subject / course
Mechanical engineering
Educational program
Masterprogram i tillverkningsteknik
Supervisors
Examiners
Available from: 2020-11-30 Created: 2020-11-30 Last updated: 2020-11-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
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