Browsing by Author "Gul, C"

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    Characterization of SiO2 Sol-Gel Coated Ti6Al4V Alloy Obtained by using TEOS and GPTMS
    Gul, C; Albayrak, S; Durmus, H; Cömez, N
    Synthesis of silicon oxide (SiO2) via the sol-gel method and SiO2 coating ability on to Ti6Al4V alloy were investigated, in the novel study. Ti6Al4V alloy is the most used alloy in biomedical applications due to its many advantages. However, it has a minor disadvantage like releasing ions into the human body. In this study, the substrate material Ti6Al4V alloy samples were coated using the sol-gel method with alkoxysilane solutions (tetraethyl orthosilicate, TEOS; Si(OC2H5)(4) and glycidoxypropyltrimethoxysilane, GPTMS; C9H20O5Si) containing the unit of prepared Si(OR)(n) after the surface preparations were made. The prepared solutions were examined using thermal analysis methods and the process temperatures to be applied to the coatings were determined according to the results of the analysis. Coated samples were subjected to aging, drying, and sintering processes at specified temperatures. The morphologies and structures of the samples were investigated by using a scanning electron microscope with energy-dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD). The sol-gel coating ability of the silicon oxide on the surface of the Ti6Al4V alloys has been discussed. The results demonstrate that cracks were observed in coating produced by TEOS precursor whereas the coatings used GPTMS precursor exhibited crack-free surface independently of dipping number. The crack formation tended to reduce with increasing dipping number of coatings produced by TEOS precursor. Distances between coating islets gradually became smaller as the number of dippings increased, and the continuity of the coatings increased. It has been observed that SiO2 coating layers produced with GPTMS are obtained in a more continuous and crack-free form than the layers produced with TEOS.
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    The Effect of Oxalic Acid on Corrosion Resistance of Hydroxyapatite Sol-Gel Coated Ti6Al4V Alloys
    Gul, C; Mutaf, S; Durmus, H
    In this study, it was aimed to develop an effective biomaterial for use in biomaterial applications, and hydroxyapatite coatings were made on Ti6Al4V substrate materials using the sol-gel method. With the sol-gel method, it was aimed to obtain a crack-free coating layer with high bioactivity and corrosion resistance. For this purpose, different ratios of oxalic acid (OA, C2H2O4) were added to the prepared hydroxyapatite solutions, and the changes in the coating morphology of this chemical were examined. Scanning electron microscopy with energy dispersive spectrum (SEM-EDS) and X-Ray diffraction (XRD) were used for analyzes. The changes in the corrosion properties of the samples were investigated by electrochemical-potentiodynamic corrosion tests carried out using a three-electrode system in the prepared simulated body fluid. As a result of the study, it was observed that with the increase of the OA contribution rate, the distances between the coating islets were closed, the cracks observed in morphology were decreased and largely prevented. When the corrosion rates were compared, it was observed that in the samples where the amount of OA was 0.001 % by weight and 0.015, the corrosion rate was 10 times less than that of other additives and 5 times less than the samples without additives.