Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7004843 | Wear | 2013 | 10 Pages |
Abstract
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 (130-200 N), when compared to the mono- (60-100 N) and bilayer coatings (110 N), considering â¼10 µm 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 4.1Ã10â8 and 7.7Ã10â7 mm3 Nâ1 mâ1) governed the wear performance of the self-mated multilayer coatings when subjected to high-load short-term tests (60-200 N; 2 h; 86 m) and medium-load endurance tests (60 N; 16 h; 691 m).
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
E. Salgueiredo, C.S. Abreu, M. Amaral, F.J. Oliveira, J.R. Gomes, R.F. Silva,