Browsing by Author "Pasinli, A"

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    Determination of Fracture Toughness of Calcium Phosphate Coatings Deposited Onto Ti6Al4V Substrate by Using Indentation Technique
    Aydin, I; Cetinel, H; Pasinli, A
    In this study, fracture toughness values of calcium phosphate (CaP) coatings deposited onto Ti6Al4V substrate were determined by using Vickers indentation method. In this new patent holding method, the activation processes were performed with NaOH and NaOH + H2O2 on the Ti6Al4V material surface. Thicknesses of CaP coatings were measured from crosssections of the samples by using optical microscopy. Vickers indentation tests were performed by using microhardness tester. Young's modulus values of the coatings were determined by using ultra microhardness tester. As a result, fracture toughness (K-1C) values of the CaP coatings produced by using two different activation processes, were calculated by using experimental study results. These were found to be 0.43 MPa m(1/2) and 0.39 MPa m(1/2), respectively. It was determined that the CaP coating on Ti6Al4V activated by NaOH + H2O2 had higher fracture toughness than the CaP coating on Ti6Al4V activated by NaOH.
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    Fracturing and adhesion behavior of hydroxyapatite formed by a citric acid and sodium citrate buffer system
    Aydin, I; Çetinel, H; Pasinli, A; Yuksel, M
    This study aims to examine the fracture and surface adhesion behavior of hydroxyapatite (HA) coatings created in acitric acid-sodium citrate buffer system. Coatings were implemented on the surface of Ti6Al4V. The modulus of elasticity, hardness and adhesion strength values of the presented coatings were determined, the fracture toughness values were calculated and scanning electron microscope (SEM) images were taken as well. Finally, the mechanical properties found by the tests implemented to hydroxyapatite coatings applied on Ti6Al4V, which yielded successful outcomes were compared to the mechanical properties of bone. The fracture toughness achieved in this study was found to be more compatible with the mechanical properties of the original bone itself when compared to the literature findings. Besides, the adhesion strength was found to be remarkably high.
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    Preparation of Hydroxyapatite Coating by Using Citric Acid Sodium Citrate Buffer System in the Biomimetic Procedure
    Aydin, I; Cetinel, H; Pasinli, A; Yuksel, M
    The present study has been aimed to investigate the preparation and analysis of calcium phosphate (CaP) based hydroxyapatite (HA, Ca-10(PO4)(6)(OH)(2)) coatings formed on Ti6Al4V alloys in a new buffer environment. The coating process has been performed by means of biomimetic method. In the study, a synthetic body fluid (SBF), which is fully compatible with human blood plasma, has been prepared for the first time in the literature by using the citric acid - sodium citrate buffer system. Using this buffer system will not cause any toxic reactions in the human body. CaP coating of the Ti6Al4V surface has been performed in this new SBF. The surface roughness and thickness specifications of the coatings have been determined, their microstructures have been analyzed by using a scanning electron microscope (SEM), the elemental analysis (EDX) of the coating surfaces and the XRD analysis have been done. The results are presented and discussed.