Journal
MATERIALS TODAY COMMUNICATIONS
Volume 8, Issue -, Pages 118-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mtcomm.2016.07.007
Keywords
Carbon nanotubes; Graphite; Alumina; Sol gel coatings; Friction; Wear
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Funding
- CETIM
- Centre de microcaracterisation Raimond Castaing-UMS, Toulouse [3623]
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Carbon/alumina coatings on stainless steel are prepared by a sol-gel route, using either carbon nanotubes (8 walls on average) or graphite flakes. The friction coefficient against a steel ball is decreased by a factor of 4-5 compared to pure alumina and wear is reduced by a factor of 2 with graphite flakes. A Raman spectroscopy study of selected specimens outside and inside the worn surface shows that the carbon nanotubes are not dramatically damaged whereas the graphite flakes are broken into graphene layers. The reasons why graphite is more effective than the carbon nanotubes, for the same carbon content, to improve the tribological behavior are discussed. (C) 2016 Elsevier Ltd. All rights reserved.
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