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dc.contributor.authorSun, Yongen
dc.contributor.authorKandan, K.en
dc.contributor.authorShivareddy, S.en
dc.contributor.authorFarukh, Farukhen
dc.contributor.authorBailey, Richarden
dc.date.accessioned2018-11-22T15:54:10Z
dc.date.available2018-11-22T15:54:10Z
dc.date.issued2018-11-17
dc.identifier.citationSun, Y., Kandan, K., Shivareddy, S., Farukh, F., Bailey, R. (2018) Effect of sliding conditions on the macroscale lubricity of multilayer graphene coatings grown on nickel by CVD. Surface and Coatings Technology, 358, pp. 247-255en
dc.identifier.issn0257-8972
dc.identifier.urihttp://hdl.handle.net/2086/17262
dc.descriptionThe file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.en
dc.description.abstractA multilayer graphene (MLG) coating was grown on a nickel substrate by atmospheric chemical vapor deposition (CVD). The macroscale dry sliding friction behavior of the coated specimens against a stainless steel counterface was investigated under various contact loads ranging from 1 N to 5 N and at various rotational speeds from 30 rpm to 240 rpm. After the tests, the sliding surfaces were characterized by optical and scanning electron microscopes and Raman spectroscopy. The results show that contact load and sliding speed had significant effects on the lubricity of the MLG coatings under dry sliding conditions. At relatively low contact loads (1-3 N) and sliding speeds (30-120 rpm), the MLG coating exhibited good lubricity with coefficient of friction (COF) below 0.06 and lasted a long period of sliding time for more than 3600 cycles. With increasing contact loads and speeds, the COF of the MLG coating was gradually increased and the coating suffered from sudden breakdown after limited sliding cycles, losing its lubricity. Detailed examination and analysis revealed that material transfer occurred at the early stage of the sliding process, where MLG was transferred from the coating surface to the counterface. This graphene transfer was responsible for the lubricity of the sliding pair and the sustainability of the transferred material on the counterface determined the lifetime of the lubricity regime. High contact loads and high speeds favored severe plastic deformation and mechanical damages of the substrate, which limited the lifetime of the transferred material and thus the lifetime of the lubricity regime. Sliding induced defects in the MLG both on the coating and on the counterface were confirmed by Raman spectroscopy.en
dc.language.isoen_USen
dc.publisherElsevieren
dc.subjectGrapheneen
dc.subjectSlidingen
dc.subjectFrictionen
dc.subjectLubricityen
dc.subjectWearen
dc.subjectCVDen
dc.titleEffect of sliding conditions on the macroscale lubricity of multilayer graphene coatings grown on nickel by CVDen
dc.typeArticleen
dc.identifier.doihttps://doi.org/10.1016/j.surfcoat.2018.11.042
dc.researchgroupInstitute of Engineering Sciences (IES)en
dc.peerreviewedYesen
dc.funderN/Aen
dc.projectidN/Aen
dc.cclicenceCC-BY-NCen
dc.date.acceptance2018-11-16en
dc.researchinstituteInstitute of Engineering Sciences (IES)en


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