Influence of silver content on the tribomechanical behavior on Ag-TiCN bioactive coatings

J. C. Sánchez-López*, M. D. Abad, I. Carvalho, R. Escobar Galindo, N. Benito, S. Ribeiro, M. Henriques, A. Cavaleiro, S. Carvalho

*Autor correspondiente de este trabajo

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

51 Citas (Scopus)

Resumen

Surface modification of bulk materials used in biomedical applications has become an important prerequisite for better biocompatibility. In particular, to overcome the particle generation, low-wear coatings based on carbon (nitrogen) and containing antimicrobial elements such as silver are promising candidates. Thus, the present work explores the potentialities of silver-containing carbonitride-based (Ag-TiCN) thin films prepared by direct current unbalanced reactive magnetron sputtering. The silver content in the coatings was varied from 0 to 26.7at.% by changing the targets and the fraction of C 2H 2 and N 2 in the gas mixture with Ar. The obtained Ag-TiCN based coatings were characterized in terms of composition and microstructure. Mechanical and tribological properties of the films were studied by nanoindentation and reciprocating pin-on disk testing in a fetal bovine serum solution, respectively. Raman, scanning electron microscope and energy dispersive X-ray analysis was carried out in the contact region after tribological tests to obtain information about the friction mechanism. The cytotoxicity of the coatings was assessed by in vitro tests using fibroblast cells. The coatings comprised a mixture of TiC xN 1-x, Ag and a-C(N) x phases whose relative proportion varied depending on the Ag/Ti ratio. The mechanical, tribological and cytotoxicity properties were correlated with the chemical and phase composition. When the Ag/Ti ratios were below 0.20 (Ag contents <6.3at.%) the films resulted harder (~18GPa) with higher wear resistance (~10 -6mm 3/Nm), showing similar friction coefficient (~0.3) and good biocompatibility.

Idioma originalInglés
Páginas (desde-hasta)2192-2198
Número de páginas7
PublicaciónSurface and Coatings Technology
Volumen206
N.º8-9
DOI
EstadoPublicada - 15 ene 2012
Publicado de forma externa

Huella

Profundice en los temas de investigación de 'Influence of silver content on the tribomechanical behavior on Ag-TiCN bioactive coatings'. En conjunto forman una huella única.

Citar esto