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DEMİRCİ, SELİM

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DEMİRCİ

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SELİM

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    Effect of surface modifications of additively manufactured Ti-6Al-4V alloys on apatite formation ability for biomedical applications
    (ELSEVIER SCIENCE SA, 2021) GÜLLÜOĞLU, ARİF NİHAT; Demirci, Selim; Dalmis, Ramazan; Dikici, Tuncay; Tuncay, Mehmet Masum; Kaya, Nusret; Gulluoglu, Arif Nihat
    In this study, Ti-6Al-4V alloys were additively manufactured (AM) with different laser powers. The goal was to investigate the effect of different surface modifications on apatite formation ability. Four types of surface modifications, namely, sandblasting (S), acid etching (E), anodic oxidation (AO) and anodic spark oxidation (ASO), were achieved on the Ti-6Al-4V samples. The microstructure, phase, morphology, roughness and wettability properties were examined by optical microscope (OM), scanning electron microscope (SEM), Xray diffraction (XRD), surface profilometer and contact angle techniques. The bioactivity analysis was performed in simulated body fluid (SBF) for 2 weeks. The results indicated that the microstructure, surface topography, roughness and wettability influenced the apatite formation were affected by the production laser power. Generally, the samples 3 showed higher Ca and P ion ratio value because of percentage of beta phase amount, the presence of bioactive phases on the surfaces. The E3 sample resulted in the best apatite formation theoretically. The etching procedure of AM Ti-6Al-4V in the acidic solution can be applied to improve the apatite formation ability of Ti-6Al-4V alloys. (c) 2021 Elsevier B.V. All rights reserved.
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    Micro/Nanoscale Surface Modification of Ti6Al4V Alloy for Implant Applications
    (SPRINGER) GÜLLÜOĞLU, ARİF NİHAT; Demirci, Selim; Dikici, Tuncay; Gulluoglu, Arif Nihat
    In this study, micro- and nanosurface structures were fabricated by sandblasting (S), acid-etching (E), anodic oxidation (A), sandblasting/acid-etching (SE), sandblasting/anodization (SA) and sandblasting/acid-etching/anodization (SEA) processes on Ti6Al4V alloy in order to investigate apatite formation ability. The phase, morphology, topography, roughness and wettability properties of surfaces were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), surface profilometer and contact angle techniques. In vitro tests were performed in simulated body fluid (SBF) for 21 days. The results showed that the surface topography, roughness and wettability changed the Ca and P ion ratio. The SEA sample had high surface topography and the lowest contact angle value. The value of Ca/P ratio was 1.81 for SEA sample. The SEA sample showed the highest Ca/P ratio value which was close to theoretical value. Ca and P ion ratio value because of bioactive phases on the surfaces, high surface roughness and lower contact angle values as compared to other samples. The proposed methodology improves the apatite formation ability of Ti6Al4V alloys. Sandblasted/acid-etched/anodized surfaces can be an alternative to conventional sandblasted/acid-etched implant surfaces.