---
_id: '24243'
abstract:
- lang: eng
text: "The addition of Ag to amorphous carbon (a-C) films is highly effective in
tailoring the tribo-mechanical properties and biocompatibility. For biomedical
applications, Ag-containing a-C (a-C:Ag) represents a promising film material
for improving the biofunctional surface properties of Ti-based alloys. In a sputtering
process, a-C:Ag films, with Ag contents up to 7.5 at.%, were deposited with a
chemically graded TixCy interlayer onto Ti6Al4V. The tribo-mechanical and biocompatible
properties of a-C:Ag were evaluated. The influence of the Ag content on these
properties was analyzed and compared to those of uncoated Ti6Al4V.\r\n\r\nRaman
spectroscopy reveals that the amount of incorporated Ag does not induce significant
structural changes in the disordered network, only a reduced number of vacancies
and sp3-coordinated C bonds within the sp2-dominant a-C network is assigned to
the films with high Ag concentration. With increasing Ag content, stresses, hardness,
and elastic modulus decrease from (2.02 ± 0.07) to (1.15 ± 0.03) GPa, from (17.4
± 1.5) to (13.4 ± 0.9) GPa, and from (171.8 ± 8.1) to (138.5 ± 5.8) GPa, respectively.
In tribometer tests, the friction behavior against Al2O3 in lubricated condition
with a simulated-body-fluid-based lubricant is not affected by the Ag concentration,
but the Al2O3 counterpart wear is reduced for all a-C:Ag films compared to a-C.
The friction against ultra-high-molecular-weight polyethylene (UHMWPE) decreases
continuously with increasing Ag concentration and the counterpart wear is lower
at higher Ag contents. Compared to a-C:Ag, Ti6Al4V demonstrates lower friction
against UHMWPE and higher friction against Al2O3. The a-C:Ag films are not exposed
to abrasion by Al2O3 or pronounced material transfer of UHMWPE. The hardness difference
and chemical affinity between the friction partners are decisive for the tribological
behavior of a-C:Ag. Compared to Ti6Al4V, the a-C:Ag films show antibacterial activity
against Staphylococcus aureus, while the proliferation of osteoblast-like cells
is reduced by Ag."
article_number: '127384'
author:
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: Carlo
full_name: Franke, Carlo
last_name: Franke
- first_name: David
full_name: Kokalj, David
last_name: Kokalj
- first_name: Dominic
full_name: Stangier, Dominic
last_name: Stangier
- first_name: Viviane
full_name: Filor, Viviane
last_name: Filor
- first_name: Rafael Hernán
full_name: Mateus-Vargas, Rafael Hernán
last_name: Mateus-Vargas
- first_name: Hilke
full_name: Oltmanns, Hilke
last_name: Oltmanns
- first_name: Manfred
full_name: Kietzmann, Manfred
last_name: Kietzmann
- first_name: Jessica
full_name: Meißner, Jessica
last_name: Meißner
- first_name: Maxwell
full_name: Hein, Maxwell
id: '52771'
last_name: Hein
orcid: 0000-0002-3732-2236
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
- first_name: Alexander
full_name: Nienhaus, Alexander
last_name: Nienhaus
- first_name: Carl Arne
full_name: Thomann, Carl Arne
last_name: Thomann
- first_name: Jörg
full_name: Debus, Jörg
last_name: Debus
citation:
ama: Tillmann W, Lopes Dias NF, Franke C, et al. Tribo-mechanical properties and
biocompatibility of Ag-containing amorphous carbon films deposited onto Ti6Al4V.
Surface and Coatings Technology. Published online 2021. doi:10.1016/j.surfcoat.2021.127384
apa: Tillmann, W., Lopes Dias, N. F., Franke, C., Kokalj, D., Stangier, D., Filor,
V., Mateus-Vargas, R. H., Oltmanns, H., Kietzmann, M., Meißner, J., Hein, M.,
Pramanik, S., Hoyer, K.-P., Schaper, M., Nienhaus, A., Thomann, C. A., & Debus,
J. (2021). Tribo-mechanical properties and biocompatibility of Ag-containing amorphous
carbon films deposited onto Ti6Al4V. Surface and Coatings Technology, Article
127384. https://doi.org/10.1016/j.surfcoat.2021.127384
bibtex: '@article{Tillmann_Lopes Dias_Franke_Kokalj_Stangier_Filor_Mateus-Vargas_Oltmanns_Kietzmann_Meißner_et
al._2021, title={Tribo-mechanical properties and biocompatibility of Ag-containing
amorphous carbon films deposited onto Ti6Al4V}, DOI={10.1016/j.surfcoat.2021.127384},
number={127384}, journal={Surface and Coatings Technology}, author={Tillmann,
Wolfgang and Lopes Dias, Nelson Filipe and Franke, Carlo and Kokalj, David and
Stangier, Dominic and Filor, Viviane and Mateus-Vargas, Rafael Hernán and Oltmanns,
Hilke and Kietzmann, Manfred and Meißner, Jessica and et al.}, year={2021} }'
chicago: Tillmann, Wolfgang, Nelson Filipe Lopes Dias, Carlo Franke, David Kokalj,
Dominic Stangier, Viviane Filor, Rafael Hernán Mateus-Vargas, et al. “Tribo-Mechanical
Properties and Biocompatibility of Ag-Containing Amorphous Carbon Films Deposited
onto Ti6Al4V.” Surface and Coatings Technology, 2021. https://doi.org/10.1016/j.surfcoat.2021.127384.
ieee: 'W. Tillmann et al., “Tribo-mechanical properties and biocompatibility
of Ag-containing amorphous carbon films deposited onto Ti6Al4V,” Surface and
Coatings Technology, Art. no. 127384, 2021, doi: 10.1016/j.surfcoat.2021.127384.'
mla: Tillmann, Wolfgang, et al. “Tribo-Mechanical Properties and Biocompatibility
of Ag-Containing Amorphous Carbon Films Deposited onto Ti6Al4V.” Surface and
Coatings Technology, 127384, 2021, doi:10.1016/j.surfcoat.2021.127384.
short: W. Tillmann, N.F. Lopes Dias, C. Franke, D. Kokalj, D. Stangier, V. Filor,
R.H. Mateus-Vargas, H. Oltmanns, M. Kietzmann, J. Meißner, M. Hein, S. Pramanik,
K.-P. Hoyer, M. Schaper, A. Nienhaus, C.A. Thomann, J. Debus, Surface and Coatings
Technology (2021).
date_created: 2021-09-13T08:53:05Z
date_updated: 2023-06-01T14:38:10Z
department:
- _id: '158'
doi: 10.1016/j.surfcoat.2021.127384
language:
- iso: eng
publication: Surface and Coatings Technology
publication_identifier:
issn:
- 0257-8972
publication_status: published
quality_controlled: '1'
status: public
title: Tribo-mechanical properties and biocompatibility of Ag-containing amorphous
carbon films deposited onto Ti6Al4V
type: journal_article
user_id: '43720'
year: '2021'
...