title: Determination of structural, mechanical and corrosion properties of Nb2O5 and (NbyCu 1-y)Ox thin films deposited on Ti6Al4V alloy substrates for dental implant applications.
abstract: In this paper comparative studies on the structural, mechanical and corrosion properties of Nb2O5/Ti and (NbyCu1-y)Ox/Ti alloy systems have been investigated. Pure layers of niobia and niobia with a copper addition were deposited on a Ti6Al4V titanium alloy surface using the magnetron sputtering method. The physicochemical properties of the prepared thin films were examined with the aid of XRD, XPS SEM and AFM measurements. The mechanical properties (i.e., nanohardness, Young's modulus and abrasion resistance) were performed using nanoindentation and a steel wool test. The corrosion properties of the coatings were determined by analysis of the voltammetric curves. The deposited coatings were crack free, exhibited good adherence to the substrate, no discontinuity of the thin film was observed and the surface morphology was homogeneous. The hardness of pure niobium pentoxide was ca. 8.64GPa. The obtained results showed that the addition of copper into pure niobia resulted in the preparation of a layer with a lower hardness of ca. 7.79 GPa (for niobia with 17 at.% Cu) and 7.75 GPa (for niobia with 25 at.% Cu). The corrosion properties of the tested thin films deposited on the surface of titanium alloy depended on the composition of the thin layer. The addition of copper (i.e. a noble metal) to Nb2O5 film increased the corrosion resistance followed by a significant decrease in the value of corrosion currents and, in case of the highest Cu content, the shift of corrosion potential towards the noble direction. The best corrosion properties were obtained from a sample of Ti6Al4V coated with (Nb0.75Cu0.25)Ox thin film. It seems that the tested materials could be used in the future as protection coatings for Ti alloys in biomedical applications such as implants.
authors.affiliation: Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, 50-372 Wroclaw, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Mazur
authors.affiliation: Motor Transport Institute, Jagiellońska 80, 03-301 Warsaw, Poland. Electronic address: malgorzata.kalisz@its.waw.pl.
authors.forename: M
authors.initials: M
authors.lastname: Kalisz
authors.affiliation: Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, 50-372 Wroclaw, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Wojcieszak
authors.affiliation: Motor Transport Institute, Jagiellońska 80, 03-301 Warsaw, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Grobelny
authors.affiliation: Wroclaw University, Institute of Experimental Physics, Max Born 9, 50-204 Wroclaw, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Mazur
authors.affiliation: Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, 50-372 Wroclaw, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Kaczmarek
authors.affiliation: Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, 50-372 Wroclaw, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Domaradzki
mesh_terms: D000497:Alloys; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003343:Corrosion; D015921:Dental Implants; D006244:Hardness; D008422:Materials Testing / Q000379:methods; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D019736:Prostheses and Implants; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D010087:Oxides; D009556:Niobium; C031462:titanium alloy (TiAl6V4); D003300:Copper; D014025:Titanium; C073337:niobium pentoxide
keywords: Dental implants; Electrochemical properties; Magnetron sputtering; Nanoindentation; Thin films