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Title: Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication
Authors: Balestra, R. M. 
Castro, A. M. G. 
Evaristo, M. 
Escudeiro, A. 
Mutafov, Petr 
Polcar, T. 
Cavaleiro, A. 
Keywords: DLC; Cu; Wettability; Tribology; Olive oil
Issue Date: Jul-2011
Publisher: Elsevier
Citation: BALESTRA, R. M. [et al.] - Carbon-based coatings doped by copper: Tribological and mechanical behavior in olive oil lubrication. "Surface and Coatings Technology". ISSN 0257-8972. Vol. 205, Supl. 2 (2011) p. S79-S83
Serial title, monograph or event: Surface and Coatings Technology
Volume: 205, Supl. 2
Abstract: We deposited C-based films doped with Cu and tested their sliding properties in olive oil as environment-friendly lubricant, which can be used in many mechanical systems, particularly in agriculture engineering. The coatings were deposited in a four unbalanced magnetron sputtering device combining C and C/Cu targets; argon (hydrogen-free films) and Ar/CH4 (hydrogenated films) atmospheres were used. Cu content of the films was in the range 5-14 at.%. The hardness of the films was almost constant whatever the Cu content was. On the other hand, hydrogen-free coatings were much harder (about 15 GPa) than hydrogenated ones (about 4 GPa). The coatings were oleophilic and their sliding properties were evaluated using ball-on-plate tests with 200000 cycles. The non-hydrogenated coating with 6 at.% of copper showed the best tribological performance with negligible wear for all olive oil testing temperatures (i.e. up to 120 °C).
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2011.01.053
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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