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Micropitting performance and friction behaviour of DLC coated bearing steel surfaces : On the influence of Glycerol-based lubricants
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Royal Institute of Technology KTH, Department of Engineering Design, Stockholm 100 44, Sweden.ORCID iD: 0000-0003-0755-7613
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Division of Machine Elements, Department of Engineering Sciences and .ORCID iD: 0000-0002-4271-0380
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-6085-7880
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1162-4671
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2024 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 196, article id 109674Article in journal (Refereed) Published
Abstract [en]

A better understanding about the rolling contact fatigue and micropitting performance of machine component surfaces lubricated with environmentally friendly lubricants is critical to designing and further formulating new lubricants intended to be used in rolling–sliding contacts such as those found in gear and bearing applications. In this work, the frictional behaviour and rolling contact fatigue (RCF) performance of DLC, Cr/a-WC:H/a-C:H and a-C:Cr coatings under glycerol-based lubrication in rolling sliding contact conditions have been investigated. Traction maps, Stribeck curves, and fatigue plots have been generated by using a micropitting test rig (MPR). The initiation and progression of micropitting was monitored by means of white light optical interferometry and scanning electron microscopy (SEM). Results indicated that glycerol-based lubricants exhibited a significant friction reduction as the hydrodynamic effect is enhanced at higher rolling-speeds. Under boundary lubrication the friction coefficient was significantly higher compared to the values obtained with a commercial mineral-based transmission oil. Compared to uncoated steel surfaces, DLC coatings effectively reduced the volume loss and micropitting progression. Irrespective of the coating thickness, DLC showed an excellent tribological behaviour when the base lubricant favours the onset of mild-wear, over micropitting. When the lubricant formulation favoured the onset of micropitting, the coatings tended to prematurely fail due to debonding from the substrate, and local micro-spallation. The experiments demonstrated that friction reduction does not necessarily correspond with a reduction of micropitting.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 196, article id 109674
Keywords [en]
Micropitting, Surface coating, Glycerol, Rolling contact fatigue
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-105398DOI: 10.1016/j.triboint.2024.109674Scopus ID: 2-s2.0-85190736825OAI: oai:DiVA.org:ltu-105398DiVA, id: diva2:1856761
Note

Full text license: CC BY 4.0;

Funder: Swedish Research Council (2017-04914, 2019-04941); Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, Formas (2019-00904); 

Available from: 2024-05-08 Created: 2024-05-08 Last updated: 2024-05-08

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Björling, MarcusShi, YijunHardell, JensLarsson, Roland

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Zapata Tamayo, Juan GuillermoBjörling, MarcusShi, YijunHardell, JensLarsson, Roland
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