Show simple item record



dc.contributor.authorPolcar, Tomáš
dc.contributor.authorGustavsson, Fredrik
dc.contributor.authorThersleff, Thomas
dc.contributor.authorJacobson, Staffan
dc.contributor.authorCavaleiro, A.
dc.date.accessioned2014-12-02T11:56:51Z
dc.date.available2014-12-02T11:56:51Z
dc.date.issued2012
dc.identifier.citationPOLCAR, T. - GUSTAVSSON, F. - THERSLEFF, T. - JACOBSON, S. - CAVALEIRO, A.: Complex frictional analysis of self-lubricant W-S-C/Cr coating. Faraday discussions. 2012, vol. 156, no. 1-2, p. 383-401. ISSN 1359-6640. DOI: 10.1039/C2FD00003Beng
dc.identifier.issn1359-6640
dc.identifier.urihttp://hdl.handle.net/10467/60926
dc.description.abstractTransition metal dichalcogenides belong to one of the most developed classes of materials for solid lubrication. However, one of the main drawbacks of most of the self-lubricating coatings is their low load-bearing capacity, particularly in terrestrial atmospheres. In our previous work, alloying thin films based on tungsten disulfide with non-metallic interstitial elements, such as carbon or nitrogen, has been studied in order to improve tribological performance in different environments. Excellent results were reached with the deposited coatings hardness, in some cases, more than one order of magnitude higher than single W-S films. In this work, W-S-C films were deposited with increasing Cr contents by co-sputtering chromium and composite WS2-C and targets. Two films were prepared with approx. 7 and 13 at.% of Cr. Alloying with chromium led to dense films with amorphous microstructure; the hardness and adhesion was improved. Sliding tests were carried out in dry and humid air using a pin-on-disc tribometer with 100Cr6 steel balls as a counterpart. To analyse the sliding process, the surfaces in the contact were investigated by X-ray photoelectron spectroscopy (bonding), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. Surface and sub-surface structural modification of the coating and composition of the transferred tribolayer are discussed in detail. High friction in humid air was attributed to the absence of a well-ordered WS2 sliding interface. On the other hand, the existence of such an interface explained the very low friction observed in dry air.eng
dc.language.isoencze
dc.publisherRoyal Society of Chemistryeng
dc.relation.ispartofFaraday discussions. 2012, vol. 156, no. 1-2eng
dc.relation.urihttp://pubs.rsc.org/en/content/articlelanding/2012/fd/c2fd00003b#!divAbstract
dc.rights(c)2012 Royal Society of Chemistryeng
dc.subjectResearch Subject Categories::TECHNOLOGY::Electrical engineering, electronics and photonicseng
dc.titleComplex frictional analysis of self-lubricant W-S-C/Cr coatingeng
dc.typeArticlecze
dc.identifier.doihttp://dx.doi.org/10.1039/C2FD00003B


Files in this item



This item appears in the following Collection(s)

Show simple item record