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Título

Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering

AutorAbad, Manuel D. ; Muñoz-Márquez, Miguel Ángel ; El Mrabet, Said ; Justo, Ángel ; Sánchez-López, J.C.
Palabras claveTungsten carbide
Amorphous carbon
Nanocomposites
Friction
Magnetron sputtering
Hardness
Fecha de publicación2010
EditorElsevier
CitaciónSurface and Coatings Technology (2010)
ResumenNanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W2C to β-WC1 − x. Further C enrichment leads to a nanocomposite structure of small WC1 − x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36–40 GPa; μ = 0.6–0.8) to moderate-hard/low friction (16–20 GPa; μ 0.2) coatings depending on the film composition. The transition point is found for a-C content of 10 at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC1 − x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites.
Descripción11 pages
Versión del editorhttp://dx.doi.org:10.1016/j.surfcoat.2010.04.019
URIhttp://hdl.handle.net/10261/24531
DOIdoi:10.1016/j.surfcoat.2010.04.019
ISSN0257-8972
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