Abstract
A pine cone-shaped tungsten−molybdenum−titanium oxides combinatorial coating was successfully grown on Ti–6Al–7Nb implant (Ti67) by a combined approach of RF/DC physical vapor deposition (PVD) and one-pot anodization. The results indicated that the surface morphology and the phase composition were significantly changed as a function of sputtering target and anodization period. Prior to anodization, PVD coating process resulted in the formation of crystalline mono- and multi-layer Mo and Mo/W thin films. After anodization for 60 min, a crystalline mixed oxide structure was formed as a result of oncoming electrochemical reactions. Compared to a single bare substrate and as-sputtered Mo/W multi-layer coating, the 60-min-anodized specimen had the highest hydrophilicity as well as Vickers hardness and showed adhesion strength of around 397 ± 1 MPa. Remarkably, the proposed modification is not only limited to Mo/W multi-layer coating, but can also be employed to a wide range of other transition metals to form a mixed oxide mono-layer on the surface of medical-grade titanium alloys for potential biomedical applications.
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Acknowledgements
The authors would like to acknowledge the University of Malaya for providing necessary resources and facilities for this study. The authors are also grateful to Research Affairs of Islamic Azad University, Najafabad Branch for supporting of this research.
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This project was funded by UMRG grant number RP035A-15AET and UM postgraduate research grant (PPP) PG130-2015B.
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Rafieerad, A.R., Bushroa, A.R., Nasiri-Tabrizi, B. et al. Anodic pine cone-like WO3/MoO3/TiO2 film with well-defined nanoflakes on Ti–6Al–7Nb implant. J Aust Ceram Soc 54, 129–137 (2018). https://doi.org/10.1007/s41779-017-0134-7
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DOI: https://doi.org/10.1007/s41779-017-0134-7