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Browsing by Author "Koc, Serap (Gungor)"

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    Article
    Examining the Ballistic Properties of the B4c and Al2o3 Ceramic Plates
    (Gazi Univ, 2022) Koc, Serap (Gungor); Akcay, Beytullah
    Boron carbide (B4C) and alumina ceramic (Al2O3) plate, known as the hardest materials are of a great scientific interest for years due to a unique combination of different useful properties. In this study, the microstructure, mechanical and ballistic properties of boron carbide (B4C) and alumina (Al2O3) ceramic plates used for ballistic protection are examined and the results are compared with similar studies in the literature. B4C and Al2O3 samples content shows a homogeneous distribution and their density is measured as 2.52 g/cm(3) and 3.85 g/cm(3), respectively. B4C and Al2O3 exhibit brittle fracture and constitute linear deformation at low stresses. Elastic properties change according to the carbon content in boron carbide structure. B4C and Al2O3 plates have trauma depths of 28.8 mm and 34.4 mm (872 m / sec on boron carbide plate, 884 m / sec, 7.62x51 mm M2 AP bullet on alumina plate and) on ballistic tests. It provides full protection within the framework of NIJ-STD-0101.07 standard. Due to the high hardness of B4C, the expectation that it will exhibit better ballistic properties compared to Al2O3 is not possible because the material is excessively brittle.
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    Article
    Fabrication and Characterization of a Multifunctional Coating To Promote the Osteogenic Properties of Orthopedic Implants
    (Mdpi, 2023) Koc, Serap (Gungor); Baygar, Tuba; Ozarslan, Selma; Sarac, Nurdan; Ugur, Aysel
    Titanium-based alloys are used in orthopedic applications as fixation elements, hard tissue replacements in artificial bones, and dental implants. Despite their wide range of applications, metallic implant defects and failures arise due to inadequate mechanical bonding, postoperative clotting problems, aseptic loosening, and infections. To improve the surface bioactivity and reduce the corrosion rate of the Ti6Al4V alloy, multi-layered coatings (HAp, BG, Cs, and Hep) were applied via electrophoretic deposition (EPD). XRD images showed the presence of HAp within the coating. In vitro investigation: cell line NIH-3T3 fibroblasts were seeded on the non-coated and coated Ti6Al4V substrates, and their cellular behavior was evaluated. The results indicated that the HApBGCsHep coating could enhance the adhesion and proliferation of NIH 3T3 cells. In addition, the potentiodynamic polarization results are compatible with the in vitro outcome.