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Influence of laser surface nanotexturing on the friction behaviour of the silicon/sapphire system

2020-01Journal article Restricted access
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dc.contributor.authorAlves-Lopes, I.
dc.contributor.authorAlmeida, Amelia
dc.contributor.authorOliveira, Vítor
dc.contributor.authorVilar, R.
dc.date.accessioned2020-01-21T14:40:46Z
dc.date.available2020-01-21T14:40:46Z
dc.date.issued2020-01
dc.description.abstractThe aim of the present work was to investigate the influence of textures consisting of Laser-Induced Periodic Surface Structures (LIPSS) on the friction coefficient of silicon under unlubricated conditions, using nanoscale friction tests. The tests were performed on <1 1 1> single crystal wafers of p-doped silicon. Surface texturing was performed by a direct writing technique, using 560 fs pulses of 1030 nm wavelength radiation and parameters allowing large areas with a uniform LIPSS texture to be obtained. The tribological tests were performed in air using a ball-on-flat nanotribometer with 3 mm diameter sapphire balls as counterbodies. The wear scars were analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The friction coefficient of polished Si remains approximately constant during the tests and is independent of the applied load, with values in the range 0.12-0.14. The morphology of the wear scars indicated that the predominant material removal mechanism is mild oxidative wear, independently of the testing conditions used, which explains the low values of the friction coefficient measured. The LIPSS texture leads to an increase of the friction coefficient, in particular in the perpendicular sliding direction. The friction coefficient increases with the applied load and is larger for the perpendicular sliding direction than for the parallel sliding direction, the difference increasing with increasing load. The morphology of the wear scars showed that the predominant wear regime remains oxidative wear, but significant contributions of plastic deformation and ploughing appear. This plastic deformation in Si, which is brittle at room temperature, shows that significant surface heating is being caused by the interaction of the asperities in motion and under load. This temperature increase also accelerates surface oxidation and increases the wear rate. Surface temperature calculations showed that the temperature increase is larger for the perpendicular sliding direction than for the parallel one, which explains the difference of friction coefficient observed in the two directions.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationALVES-LOPES, I.; [et al] – Influence of laser surface nanotexturing on the friction behaviour of the silicon/sapphire system. Optics and Laser Technology. ISSN 0030-3992. Vol. 121 (2020), pp. 1-10pt_PT
dc.identifier.doi10.1016/j.optlastec.2019.105767pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/11014
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://pdf.sciencedirectassets.com/271488/1-s2.0-S0030399219X00092/1-s2.0-S0030399219308187/main.pdf?X-Amz-Date=20200121T143657Z&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Signature=050302fabe95af2610e67d65d527f4075731be2a6dc240ce691ea95b959fd0e7&X-Amz-Credential=ASIAQ3PHCVTY63RKH6W3%2F20200121%2Fus-east-1%2Fs3%2Faws4_request&type=client&tid=prr-47992762-f520-467e-8355-691efad10b97&sid=05df792b4e13a647830a7d82bd2649ec723dgxrqb&pii=S0030399219308187&X-Amz-SignedHeaders=host&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEH4aCXVzLWVhc3QtMSJGMEQCIFEgjSdTB%2Fbj89AJtEVBvz0mkU8F9Y6WUbp02YgwSA0FAiAmXLHhWsOqCaD%2Bu4MSlPNnqu1vPJxr0xfEqO%2FKNE8fzSq0AwgXEAIaDDA1OTAwMzU0Njg2NSIM2fIh%2FYTOKS2AQ0HvKpEDgq%2FjuLrBmLAi4PqZKmSgqQEVijXyY%2F7OrYRZ8fqZCFegJGwJvfJkAGodlhCLHU8NPPpVYUeFucJKko6zvB4CQAHPLmvD6az0%2FbYunTK21KO3Qd34pzMDayXQbnrobFRZvnQUyueWm8IY9gB4CGWcKS7lWW%2FOJWIB9Doucx8aZkG5DGGidbvT4UCTHouh5WVTENG61iZAEyr56eixWb%2FrZJI9T6TkF0JcJ4yYe12KfMCpVntR7YvI%2Fm0WQZT30rY0usrff2qDj5aOMZnrwYEG5Cb5Ru4mRXhGdG%2Bjwk1VeEvd85OfJfEqljgvjynsEAGVTU6TYS8SoSaWpEiIJpEUkjPJffhHkM2InZ7h3EP32IwZx7qyjaJTvFnJZs63xSLB8YbHwez8%2BhWWquUkalpCtSyF34z%2B3FNX4GXYo76s8SiFtzuctGKbfJzPc%2FuMgudwR3fDsl8q%2FvmSDeQRKU%2Fbkjx%2B5dp3mTL4oMUcVEZTNwXmaclBAmcltm%2F8r%2Fq6BA8ojeEAt3sOgOltkhLAP0sHjV0w%2F4Wc8QU67AGeAfAhGoq27hf%2Fv4BsmUsxJF2ZEHghTEg%2BJidXyCNc9HLLbVU40TSSJWNoDpbcyZo6vMYB5vNjTAd3Bp7TNJZBywScOHAknOvJNW0%2Fz79D5Te82jm8ceY61nbmsK8XxrkZkSxXRSzRZCtHEWp6pHaqouHLsVuI%2Fe%2BbmzsuU%2B%2FBJnGJFJtkHJ1aVcgD09mTLH0c1dSD17SXuPuF0UnZIwwZun2MZY%2F0dzL5wAKaba6Y9YwVkiC1BgOnW%2FsgLIdktpxvXHy1qpKP8gyRlgQoezF9cTEvQmCzkNAbi6%2FXIjHVEET4gmGdT9U9zj%2Ba2Q%3D%3D&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&X-Amz-Expires=300&hash=249e4d0ffc70ae9459cbcfd958c1afed36510229925a302721673f8735dcfca2pt_PT
dc.subjectLaser surface texturingpt_PT
dc.subjectLaser-induced periodic surface structurespt_PT
dc.subjectLIPSSpt_PT
dc.subjectFemtosecond laserpt_PT
dc.subjectFrictionpt_PT
dc.subjectSiliconpt_PT
dc.titleInfluence of laser surface nanotexturing on the friction behaviour of the silicon/sapphire systempt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F04540%2F2013/PT
oaire.citation.endPage10pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleOptics and Laser Technologypt_PT
oaire.citation.volume121pt_PT
oaire.fundingStream5876
person.familyNameAlmeida
person.familyNameOliveira
person.givenNameAmelia
person.givenNameVitor
person.identifier.ciencia-id0910-636F-E139
person.identifier.ciencia-idDA1C-25BD-5974
person.identifier.orcid0000-0002-4092-1029
person.identifier.orcid0000-0002-1757-4524
person.identifier.ridB-5649-2008
person.identifier.ridA-3058-2009
person.identifier.scopus-author-id7202913198
person.identifier.scopus-author-id7006105706
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationaa238e8a-a0a1-4f49-be44-3ae9efcd47b8
relation.isAuthorOfPublication269ff9af-427f-4d1d-949c-cd77cd386e9f
relation.isAuthorOfPublication.latestForDiscovery269ff9af-427f-4d1d-949c-cd77cd386e9f
relation.isProjectOfPublication3297f951-302f-4f9a-a77a-f5068533d370
relation.isProjectOfPublication.latestForDiscovery3297f951-302f-4f9a-a77a-f5068533d370

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