Preparation and characterization of biocompatible Nb–C coatings

• Published in: Thin solid films 2011-04, Vol.519 (12), p.4064-4068
• Main Authors: Braic, M., Braic, V., Balaceanu, M., Vladescu, A., Zoita, C.N., Titorencu, I., Jinga, V., Miculescu, F.
• Format: Article
• Language: English
• Subjects: Cell viability; Composition and phase identification; Condensed matter: structure, mechanical and thermal properties; Corrosion resistance; Cross-disciplinary physics: materials science; rheology; Deposition by sputtering; Exact sciences and technology; Magnetron sputtering; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; NbC coatings; Physics; Structure; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2011.01.193

Nb–C composite films, obtained by DC magnetron sputtering method, were investigated as possible candidates for the protective layers used in medical implants. Coatings of different carbon/niobium ratios were prepared and analyzed for elemental and phase composition, crystallographic structure, texture, corrosion behavior, and cell viability. The coating with the highest C/Nb ratio (≈ 1.9) was found to have a nanocomposite structure, in which NbC nanocrystalline phase coexists with an amorphous a-C one. The coated samples exhibited an improved corrosion resistance as compared with the Ti alloy. Cell viability measurements proved that human osteosarcoma cells are adherent to the coating surfaces, the highest viability being found for the film with the highest carbon content.