Application of diamond-like carbon coatings to elastomers frictional surfaces
| Autor: | Roman Nevshupa, Javier Méndez, Y. Gachon, L. Álvarez, M.A. Jimenez, J.R. Valdés, F. Faverjon, E. Mozas, Elisa Roman, C. Heau, Yves Huttel, Lidia Martínez |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Diamond-like carbon Mechanical Engineering Drop (liquid) Surfaces and Interfaces engineering.material Elastomer Surface energy Surfaces Coatings and Films Contact angle Sessile drop technique Coating X-ray photoelectron spectroscopy Mechanics of Materials engineering Composite material |
| Zdroj: | Tribology International. 42:584-590 |
| ISSN: | 0301-679X |
| Popis: | Nitrile-butyl rubber-like materials were coated with amorphous hydrogenated diamond-like carbon (DLC) coatings in order to modify their surface and tribological properties. Measurements of water contact angle were performed by the sessile drop method and showed that the coated samples are more hydrophobic with water contact angles up to 116°. The surface free energy of the elastomers was calculated by the acid–base regression method considering polar and dispersive contributions and the results were correlated with changes in the surface chemistry measured by X-ray photoelectron spectroscopy. It has been found that the lower presence of oxygen functional groups on the elastomer surfaces led to lower surface free energies, even though the polar contribution was not predominant. We also found that the DLC coatings led to a significant decrease of the surface free energy (up to 16%) and that there is a good correlation between the surface free energy values and the corresponding water contact angle values. The coefficient of friction was also measured and presented a significant decrease after coating with DLC. |
| Databáze: | OpenAIRE |
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