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Dispersion of graphite flakes into boehmite sols for the preparation of bi-layer-graphene / alumina coatings on stainless steel for tribological applications

Hentour, Karim and Turq, Viviane and Weibel, Alicia and Ansart, Florence and Sobrino, Jean-Michel and Garcia, Julien and Cardey, Pierre-François and Laurent, Christophe Dispersion of graphite flakes into boehmite sols for the preparation of bi-layer-graphene / alumina coatings on stainless steel for tribological applications. (2019) Journal of the European Ceramic Society, 39 (4). 1304-1315. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2018.10.027

Abstract

Carbon-alumina coatings on stainless steel were prepared by a sol-gel route. The dispersion of the commercial graphite flakes by an ultrasonic bath, an ultrasonic probe and a high-shear mixer, produce thinner flakes, fewlayered-graphene and bi-layer-graphene (BLG), respectively. The coatings were examined by optical and electron microscopy, interferential rugosimetry, optical profilometry and Raman spectroscopy. The friction coefficient against a steel ball is decreased by a factor of 5–7 and the wear volume is reduced by a factor of 6–38 compared to a pure alumina coating. The best results correspond to the sample prepared using the high-shear mixer. Delamination of the graphite flakes into BLG during the friction test provides the system with debris suitable for tribofilm building up and lubrication but it is better to already have carbon dispersed as BLG in the coating before the test, notably because the carbon surface area available is much higher.

Item Type:Article
HAL Id:hal-02135665
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Centre Technique des Industries Mécaniques - CETIM (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:30 Jan 2019 15:55

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