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Structural, mechanical and tribological behavior of fullerene-like and amorphous carbon nitride coatings
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.ORCID iD: 0000-0002-2837-3656
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2004 (English)In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 13, no 10, 1882-1888 p.Article in journal (Refereed) Published
Abstract [en]

The mechanical and tribological properties of fullerene-like (FL) and amorphous carbon nitride (CNX) coatings synthesized by reactive unbalanced magnetron sputtering were analyzed and compared to carbon coatings deposited without N2. Elastic recoil detection analysis (ERDA) was used to determine the amount of incorporated nitrogen while X-ray photoelectron spectroscopy (XPS) was used to study the local bonding environment. Nano-indentation revealed a large spread in hardness, elastic modulus and elastic recovery. The tribological performance of the coatings was tested with a reciprocating sliding tribometer that allowed in situ visualization of the sliding contact. Tests were performed with a sapphire hemisphere sliding at 4 mm/s in dry and ambient humidity air. Friction coefficients of the FL-CN X coatings in both humidities were slightly higher than those of diamond-like carbon coatings (DLC), the values were between 0.1 and 0.25, dropping as the bias voltage increased. FL-CNX coatings had higher wear resistance than amorphous CNX, DLC and graphite coatings in sliding contact although the hardnesses of the coatings were comparable. Wear rates of the FL-CNX coatings in ambient air were lower than in dry air and orders of magnitude lower than the other carbon coatings. Furthermore, the most wear-resistant high-temperature FL-CNX coating had the highest hardness, but the shortest wear life of the three high-temperature FL-CN X coatings. In situ visualization indicated films transferred from the coating to the sapphire hemisphere, the transfer film isolated the hemisphere from the coating, thereby controlling both the friction coefficient and the wear behavior. Effects of deposition conditions, structure and hardness on wear and friction behavior are discussed. © 2004 Elsevier B.V. All rights reserved.

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2004. Vol. 13, no 10, 1882-1888 p.
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URN: urn:nbn:se:liu:diva-29683DOI: 10.1016/j.diamond.2004.05.012Local ID: 15070OAI: oai:DiVA.org:liu-29683DiVA: diva2:250500
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13

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Neidhardt, JörgHultman, Lars

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