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dc.contributor.authorAbreu, C. S.-
dc.contributor.authorOliveira, F. J.-
dc.contributor.authorGomes, J. R.-
dc.contributor.authorBelmonte, M.-
dc.contributor.authorFernandes, A. J. S.-
dc.contributor.authorSilva, R. F.-
dc.identifier.citation"Materials science forum". ISSN 0255-5476. 514-516 (2006) 749-753.eng
dc.description.abstractIn-situ measurements of acoustic emission (AE) in self-mated tribological pairs of CVD diamond coated silicon nitride (Si3N4) were made with the purpose of investigating the relationship between AE signal and friction events. A good correlation is found between the energy dissipation/emission processes, therefore enabling the possibility of monitoring the different friction regimes occurring during the sliding contact of microcrystalline diamond (MCD) coatings. Deposition of MCD on flat and ball-shaped Si3N4 samples was accomplished using microwave plasma assisted chemical vapour deposition (MPCVD) with H2/CH4 gas mixtures. The friction behaviour of self-mated MCD coatings was assessed using a reciprocating ball-on-flat geometry. The tests were run in ambient atmosphere without lubrication, the frequency (1Hz) and stroke (6mm) were kept constant while the applied normal load varied in the range 10-80N. The microstructure, surface topography and roughness of the MCD coatings were characterised by SEM and AFM techniques. The diamond quality was assessed from micro-Raman spectroscopy. The friction evolution was characterised by a short running-in period where the main feature is a sharp peak reaching values as high as approximately 0.6 followed by a steady-state regime with very low values in the range 0.03-0.04.eng
dc.publisherTrans Tech Publicationseng
dc.subjectCVD diamondeng
dc.subjectSilicon nitrideeng
dc.subjectFriction behavioureng
dc.subjectAcoustic emissioneng
dc.titleIn-situ friction monitoring of self-mated CVD diamond coatings using acoustic emissioneng
oaire.citationIssuePART 1por
dc.subject.wosScience & Technologypor
sdum.journalMaterials science forumpor
sdum.conferencePublicationADVANCED MATERIALS FORUM III, PTS 1 AND 2por
Appears in Collections:CIICS - Artigos em revistas de circulação internacional com arbitragem científica
DEM - Artigos em revistas de circulação internacional com arbitragem científica

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