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TitleSelf-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings
Author(s)Salgueiredo, E.
Abreu, C. S.
Amaral, M.
Oliveira, F. J.
Gomes, J. R.
Silva, R. F.
KeywordsDiamond multilayers
Nanocrystalline diamond
Hot filament CVD
Issue date2013
Abstract(s)The tribological response of multilayer micro/nanocrystalline diamond coatings grown by the hot filament CVD technique is investigated. These multigrade systems were tailored to comprise a starting microcrystalline diamond (MCD) layer with high adhesion to a silicon nitride (Si3N4) ceramic substrate, and a top nanocrystalline diamond (NCD) layer with reduced surface roughness. Tribological tests were carried out with a reciprocating sliding configuration without lubrication. Such composite coatings exhibit a superior critical load before delamination (130–200N), when compared to the mono -(60–100 N) and bilayer coatings (110N), considering ∼10 micrometers thick films. Regarding the friction behaviour, a short-lived initial high friction coefficient was followed by low friction regimes (friction coefficients between 0.02 and 0.09) as a result of the polished surfaces tailored by the tribological solicitation. Very mild to mild wear regimes (wear coefficient values between 4.1 x10−8 and 7.7 x10−7 mm3 N−1 m−1) governed the wear performance of the self-mated multilayer coatings when subjected to high-load short-term tests (60–200N; 2h; 86m) and medium-load endurance tests (60N; 16h; 691m).
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AccessRestricted access (UMinho)
Appears in Collections:CT2M - Artigos em revistas de circulação internacional com arbitragem científica

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