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Structure and properties of Cr–C/Ag films deposited by magnetron sputtering
Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala, Sweden.
Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala, Sweden; Impact Coatings AB, Linköping, Sweden. (Impact Coatings AB)
Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-3203-7935
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2015 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 281, 184-192 p.Article in journal (Refereed) Published
Abstract [en]

Cr–C/Ag thin films with 0–14 at.% Ag have been deposited by magnetron sputtering from elemental targets. The samples were analyzed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) to study their structure and chemical bonding. A complex nanocomposite structure consisting of three phases; nanocrystalline Ag, amorphous CrCx and amorphous carbon is reported. The carbon content in the amorphous carbide phase was determined to be 32–33 at.% C, independent of Ag content. Furthermore, SEM and XPS results showed higher amounts of Ag on the surface compared to the bulk. The hardness and Young's modulus were reduced from 12 to 8 GPa and from 270 to 170 GPa, respectively, with increasing Ag content. The contact resistance was found to decrease with Ag addition, with the most Ag rich sample approaching the values of an Ag reference sample. Initial tribological tests gave friction coefficients in the range of 0.3 to 0.5, with no clear trends. Annealing tests show that the material is stable after annealing at 500 °C for 1 h, but not after annealing at 800 °C for 1 h. In combination, these results suggest that sputtered Cr–C/Ag films could be potentially applicable for electric contact applications.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 281, 184-192 p.
Keyword [en]
Amorphous; Chromium carbide; Silver; Magnetron sputtering; Mechanical properties; Electrical properties
National Category
Condensed Matter Physics
URN: urn:nbn:se:liu:diva-123411DOI: 10.1016/j.surfcoat.2015.09.054ISI: 000366072200024OAI: diva2:882913
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2016-01-13Bibliographically approved

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Palisaitis, JustinasPersson, Per O.Å .
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