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    Additive manufacturing of bionanomaterials for biomedical applications based on TI6AL4V and PLA: a systematic review
    (EDP Sciences, 2023) Evlen, H.; Ziyamukhamedova, U.; Juraev, D.; Abdukarimov, M.
    Additive manufacturing (AM) is the owner of a huge potential as a manufacturing technology in fabricating functional implants, and scaffolds for biomedical applications. AM, which includes 3D printing (3DP) and 3D bioprinting, can be the solution to produce several needs such as scaffolds/implants, tissue or organs, or medical devices by combining different biomaterials with nanomaterials. Titanium and its alloys and Polylactic acid (PLA) are commonly used in bone tissue repair with their superior bio-functionality. The rapid advancement of three-dimensional (3D) printing technology has enabled the fabrication of porous titanium and polymer composite scaffolds with controllable microstructures, which is regarded as an effective method for promoting rapid bone repair. An electronic literature search was conducted in PubMed, Web of Science, Scopus, Elsevier, Embase, and other numerous databases up to December 2021 which are accessed by Karabuk university. To evaluate the possibility of bias and methodological quality, the SYRCLE tool and the last version of the CAMARADES list were used, respectively, a meta-analysis could not be performed. This systematic review is aimed to evaluate the common biomedical potential of 3D-printed porous Ti6Al4V (Ti64) and PLA matrix scaffold for repairing bone defects to investigate the influential factors that might affect its osteogenic availability. The most ideal parameters for designing the Ti64 scaffold were found to be a pore size of around 300-400 m and porosity of 60-70%, while PLA scaffolds show 350-400 m and nearly the same percentage in porosity as Ti64. © 2023 EDP Sciences. All rights reserved.
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    Investigation of corrosion properties of box boring din 20MnCr5 steel bars
    (EDP Sciences, 2023) Sahin, N.; Isikgül, A.; Ziyamukhamedova, U.; Ahlatci, H.; Acarer, M.; Sevim, M.
    In this study, boriding process was carried out on ? 11 mm diameter DIN 20MnCr5 quality steel bars, used in chain elements such as links and rings, and fasteners such as bolts, at 950oC boronizing temperature, boriding times of 2.5 and 7.5 hours. In this study, the formation and growth of the boride layer and the metallographic structure, the coating thickness and corrosion properties of the boronized steels were investigated depending on the boriding conditions. In the box boriding process, Ekabor-II powder mixture, with its commercial name, was used as boriding powder. According to the optical microstructure results made as a result of box boriding, the coating thickness was 371.5 ?m in the ? 11 mm diameter boronized DIN 20MnCr5 steel bar for 7.5 hours boriding times while it was 195.6 ?m in that steel bar for 2.5 hours boriding times. Corrosion experiments were carried out in solutions prepared by adding 3.5% NaCl to distilled water. According to the results of the immersion test, the lowest corrosion rate in mdd was measured as 112 mg/(dm2 x day) in the ? 11 mm diameter, 7.5 hour boronized sample, and the highest corrosion rate in mdd was 1456.75 mg/(dm2 x day) in the untreated ? 11mm diameter sample. In the potentiodynamic polarization test, parallel results were obtained for immersion corrosion. Corrosion rate values (icor) were measured at the highest value of 209 x 10- 6 A/cm2 in the untreated ? 11 diameter sample, while the lowest icor value was 0.0039 x 10- 6 A/cm2 in the ? 11 mm diameter sample borided for 7.5 hours. © 2023 EDP Sciences. All rights reserved.
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    Modeling of the process of mechano activation of filler particles in polymer composites
    (EDP Sciences, 2023) Ziyamukhamedova, U.; Evlen, H.; Nafasov, J.; Jalolova, Z.; Turgunaliyev, E.; Rakhmatov, E.
    The article presents the results of the study of the filler particles activation mechanism in the production of composite polymeric materials modified by mechanical activation. The studies were conducted in simulated conditions of motion of filler particles taking into account the trajectory of motion during milling in progressive-rotational activation units using analytical expression of velocity distribution of each filler particle in the composite material. © 2023 EDP Sciences. All rights reserved.