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Carbon nanotube/alumina and graphite/alumina composite coatings on stainless steel for tribological applications

2016; Elsevier BV; Volume: 8; Linguagem: Inglês

10.1016/j.mtcomm.2016.07.007

2352-4928

Karim Hentour, Alexis Marsal, Viviane Turq, Alicia Weibel, Florence Ansart, Jean-Michel Sobrino, Yan Ming Chen, Julien Garcia, Pierre-François Cardey, Christophe Laurent,

Diamond and Carbon-based Materials Research

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.