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Monteveglio, Italy

Faghihi-Sani M.-A.,Sharif University of Technology | Arbabi A.,METCO Srl | Mehdinezhad-Roshan A.,Sharif University of Technology | Mehdinezhad-Roshan A.,University of Texas at Arlington
Ceramics International | Year: 2013

Surface modification of titanium implants is recently considered by several researchers. In this study, PEO was performed over commercially Ti-6Al-4V alloy pellets in an aqueous electrolyte containing calcium acetate (C.A.) and calcium glycerphosphate (Ca-GP) with a Ca/P molar ratio of 6.8, and applying current density of 0.212 A/cm2, frequency of 100 Hz and duty ratio of 60% for 4 min. In the next step, hydrothermal treatments were carried out for various durations and at different temperatures inside an autoclave chamber containing a NaOH solution with pH of 11.5. XRD and SEM results confirmed formation of needle-shaped HAp after all hydrothermal conditions. Maximum intensity of HAp peaks was observed for the hydrothermally treated sample at 190 °C for 15 h. Moreover, crystallinity degree of HAp was increased by increasing hydrothermal duration and temperature. According to the SEM line scan analysis of cross section of the PEO coated sample after hydrothermal treatment at 190 °C for 15 h, it seems that Ca+2 and [PO4]-3 ions from internal layer of amorphous coating diffuse to the coating surface and dissolve into the solution during hydrothermal treatment, and finally precipitate on the outer layer of coating as needle-shaped HAp. © 2012 Elsevier Ltd and Techna Group S.r.l. Source


Bondioli F.,University of Modena and Reggio Emilia | Dinelli M.,University of Modena and Reggio Emilia | Giovanardi R.,University of Modena and Reggio Emilia | Giorgi M.,METCO Srl
Journal of the European Ceramic Society | Year: 2010

The aim of this study was to assess surface functionalization of industrial ceramic tiles through the addition of soluble salts to improve mechanical properties (scratch and wear resistance) and conductivity, while preserving the aesthetic aspects of the finished product. This objective was pursued through the application of different solutions of titanium and silver with a potential for transformation into titania and silver nanoparticles during the sintering of the material. The solutions, in different concentrations, were applied (300g/m2) to unglazed green tiles by air brushing. The resulting products were polished and characterized in terms of microstructural, surface micromechanical, and technological properties based on the UNI EN ISO reference standards. The electrical conductivity deriving from the presence of titania and silver was also established with specific tests. The results were found to correlate with the results obtained from the addition of zirconium solutions as reported in part I of the paper. © 2010. Source


Bondioli F.,University of Modena and Reggio Emilia | Manfredini T.,University of Modena and Reggio Emilia | Giorgi M.,METCO Srl | Vignali G.,METCO Srl
Journal of the European Ceramic Society | Year: 2010

The aim of this investigation was the surface functionalization of industrial ceramic tiles by soluble salts addition to improve mechanical properties (resistance to scratch and wear) preserving the aesthetical aspect of the final product. This objective was pursued through the application of different solution of zirconium capable to be transformed in zirconia nanoparticles during the material sintering. The solutions, in different concentrations, were deposited (300 g/m2) on unglazed green tiles by air-brushing. The obtained products were polished and characterized in terms of microstructure, surface micromechanical and technological properties based on the UNI EN ISO reference rules. The final aesthetical aspect of the products and the obtained hue variation were evaluated by means of UV-vis spectroscopy and colorimetric analysis. © 2009 Elsevier Ltd. All rights reserved. Source

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