Sol–gel derived hydroxyapatite/titania biocoatings on titanium substrate |
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Affiliation: | 1. Università di Padova, Dipartimento di Tecnica e Gestione dei Sistemi Industriali-DTG, Stradella San Nicola 3, I-36100 Vicenza, Italy;2. Università di Padova, Dipartimento di Ingegneria Industriale-DII, Via Marzolo 9, I-35131 Padova, Italy;3. The Pennsylvania State University, Department of Materials Science and Engineering, University Park, PA 16802, USA |
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Abstract: | A simple sol–gel method was successfully developed for a hydroxyapatite (HA)/TiO2 double layer deposition on a pure titanium substrate. Phase formation, surface morphology, and interfacial microstructure were investigated by differential scanning calorimetry analysis (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The TiO2 layer was coated by a spin coating method at a speed of 1500 rpm for 15 s, followed by a heat treatment at 560 °C for 20 min. The HA film was subsequently spin coated on the outer surface at the same speed and then heat-treated at difference temperatures. Results indicated that the HA phase began to crystallize after a heat treatment at 580 °C; and the crystallinity increased obviously at a temperature of 780 °C. The HA film showed a porous structure and a thickness of 5–7 μm after the heat treatment at 780 °C. SEM observations revealed no delamination and crack at the interfaces of HA/TiO2 and TiO2/Ti. The HA film with a porous structure is expected to be more susceptible to the natural remodeling processes when it is implanted in a living body. |
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