Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue -, Pages S79-S83Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.01.053
Keywords
DLC; Cu; Wettability; Tribology; Olive oil
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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 200,000 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 degrees C). (C) 2011 Elsevier B.V. All rights reserved.
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