Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/6123

TitleIn-situ friction monitoring of self-mated CVD diamond coatings using acoustic emission
Author(s)Abreu, C. S.
Oliveira, F. J.
Gomes, J. R.
Belmonte, M.
Fernandes, A. J. S.
Silva, R. F.
KeywordsCVD diamond
Silicon nitride
Friction behaviour
Acoustic emission
Issue date2006
PublisherTrans Tech Publications
JournalMaterials science forum
Citation"Materials science forum". ISSN 0255-5476. 514-516 (2006) 749-753.
Abstract(s)In-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.
TypeConference paper
URIhttp://hdl.handle.net/1822/6123
ISBN*************
ISSN0255-5476
Peer-Reviewedyes
AccessOpen access
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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