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https://hdl.handle.net/1822/6128
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Campo DC | Valor | Idioma |
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dc.contributor.author | Abreu, C. S. | - |
dc.contributor.author | Oliveira, F. J. | - |
dc.contributor.author | Belmonte, M. | - |
dc.contributor.author | Fernandes, A. J. S. | - |
dc.contributor.author | Silva, R. F. | - |
dc.contributor.author | Gomes, J. R. | - |
dc.date.accessioned | 2007-02-08T11:28:40Z | - |
dc.date.available | 2007-02-08T11:28:40Z | - |
dc.date.issued | 2005 | - |
dc.identifier.citation | "Wear". ISSN 0043-1648. 259:1 (2005) 771-778. | eng |
dc.identifier.issn | 0043-1648 | eng |
dc.identifier.uri | https://hdl.handle.net/1822/6128 | - |
dc.description.abstract | Chemical vapour deposited (CVD) diamond coatings are important for tribological applications due to their unique combination of properties. Previous work demonstrated that silicon nitride (Si3N4) excels as a substrate for diamond coatings due to its low thermal expansion coefficient mismatch relative to diamond films resulting in a significant adhesion improvement. In this study, dense Si3N4 substrates were fabricated by pressureless sintering and diamond coated by microwave plasma chemical vapour deposition (MPCVD). The deposition time varied between 1 and 10 hours in order to investigate the effect of the diamond grain size and film thickness on the tribological behaviour of self-mated CVD diamond coatings on Si3N4. Reciprocating dry sliding ball-on-flat wear tests were performed in air up to 16 hours, at room temperature, with normal applied load ranging from 10 N to 105 N. The stroke and frequency of the sliding motion were kept constant with values of 6 mm and 1 Hz, respectively. Several characterisation techniques (SEM, AFM, micro-Raman) were used to identify the prevailing surface damage mechanisms. After a very short running-in regime, with high friction coefficients, a steady-state regime is reached, characterized by extremely low friction values (f~0.03). A mild wear mode was achieved for the longer runs, with wear coefficient values around 10-8 mm3N-1m-1. The larger grain sized and thicker coatings present smaller compressive residual stresses (below 1 GPa) due to a better in-depth accommodation of the contact pressure. This delays film delamination to much higher applied loads (105 N) than the thinner, small grain sized coatings, grown for 1 hour that fail in sliding under 35 N of normal load. | eng |
dc.language.iso | eng | eng |
dc.publisher | Elsevier 1 | eng |
dc.rights | openAccess | eng |
dc.subject | Wear | eng |
dc.subject | Friction | eng |
dc.subject | CVD diamond | eng |
dc.subject | Grain size | eng |
dc.title | Grain size effect on self-mated CVD diamond dry tribosystems | eng |
dc.type | article | por |
dc.peerreviewed | yes | eng |
sdum.number | 1 | eng |
sdum.pagination | 771-778 | eng |
sdum.publicationstatus | published | eng |
sdum.volume | 259 | eng |
oaire.citationStartPage | 771 | por |
oaire.citationEndPage | 778 | por |
oaire.citationIssue | 1-6 | por |
oaire.citationVolume | 259 | por |
dc.identifier.doi | 10.1016/j.wear.2005.01.004 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Wear | por |
Aparece nas coleções: | CIICS - Artigos em revistas de circulação internacional com arbitragem científica |
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