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Tribological behaviour of nanostructured Ti-C:H coatings for biomedical applications

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The development of a mechanically stable, functionally graded Ti-doped a-C:H interface layer in combination with a functional a-C:H coating requires a reduction of the brittle phases which induce generally problems in the transitions from Ti to TiC/a-C:H. The core objective of this study was to develop an optimum interlayer between the substrate and the functional top layer for biomedical applications, namely for tooth implants. Since the interlayer may be exposed to the sliding process, in the case of local failure of the top layer it has to fulfil the same criteria: biocompatibility, high wear resistance and low friction.

The functional Ti-C:H layers with thickness in the range 2.5–3.5 ?m were deposited by a magnetron sputtering/PECVD hybrid process by sputtering a Ti-target in a C2H2 + Ar atmosphere in dc discharge regime. The sets of coating samples were prepared by varying the C and H concentrations controlled by the C2H2 flow during the deposition process. The tribological properties were evaluated on a pin-on-disc tribometer at room temperature (RT) and at 100 °C using 440C balls with a diameter of 6 mm. The tests at 100 °C were performed to investigate the effect of the sterilization temperature on the tribological properties and the coating lifetime as well. The tribological performance was examined with respect to the friction coefficient, the wear rates of the coating and the counter-parts and the analysis of the wear debris. The Ti/C ratio decreased almost linearly from 4.5 to 0.1 with increasing C2H2 flow; the hydrogen content showed a minimum of 5 at.% at C2H2 flow of 30 sccm, while for lower flows it was about 10 at.%. The coatings could be divided into three groups based on the C2H2 flow: (i) 10–15 sccm, exhibiting severe abrasive damage during the sliding tests, (ii) 20–45 sccm, showing the highest hardness and friction values, and (iii) 52–60 sccm, with moderate hardness and minimal values of the friction coefficient and the wear rate.

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Citation

Polcar, Tomas, Vitu, Tomas, Cvrcek, Ladislav, Novak, Rudolf, Vyskocil, Jiri and Cavaleiro, Albano (2009) Tribological behaviour of nanostructured Ti-C:H coatings for biomedical applications Solid State Sciences, 11, (10), pp. 1757-1761. (doi:10.1016/j.solidstatesciences.2008.10.006).

More information

Published date: 2009
Organisations: nCATS Group

Identifiers

Local EPrints ID: 199821
URI: http://eprints.soton.ac.uk/id/eprint/199821
ISSN: 1293-2558
PURE UUID: 251a2e65-0557-471d-8043-1c607890aeaa
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 20 Oct 2011 14:59
Last modified: 18 Jul 2017 11:15

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Contributors

Author: Tomas Polcar ORCID iD
Author: Tomas Vitu
Author: Ladislav Cvrcek
Author: Rudolf Novak
Author: Jiri Vyskocil
Author: Albano Cavaleiro

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