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Öğe A comparative study about hydroxyapatite coated AZ31 and AZ91 Mg alloys(Springer Science and Business Media Deutschland GmbH, 2023) Başlayıcı, Serkan; Buğdaycı, Mehmet; Benzeşik, Kağan; Çoban, Oytun; Yücel, O.; Açma, ErcanMagnesium alloys are potential candidates for hard tissue replacements due to their structural and mechanical properties close to bone. Unlike conventional metallic implants, the corrosion rate of magnesium is quite high. This will be an advantage if magnesium-based materials are used as biodegradable. In this study, Magnesium-based AZ31 and AZ91 magnesium alloys were coated with hydroxyapatite by plasma spray and electrostatic spray methods and their corrosion rates were compared.Öğe Combustion synthesis of B4C–TiB2 composite nanoparticle by Self-Propagating High-Temperature Synthesis (SHS) in B2O3–TiO2–Mg–C system(Springer Science and Business Media Deutschland GmbH, 2023) Çoban, Ozan; Buğdaycı, Mehmet; Başlayıcı, Serkan; Açma, Mahmut ErcanIn this study, B4C-TiB2 nanocomposite powder was synthesized from oxide raw materials with the principle of magnesiothermic reduction in B2O3–TiO2–Mg–C system by SHS method. For the SHS process, Mg and C stoichiometries were optimized with thermochemical simulation, and composite charge stoichiometry and Mg particle size were optimized with XRD, BET and SEM analyzes. Optimization of acid concentration, leaching temperature, and leaching time parameters has been provided for the HCl leaching processes carried out to remove undesired by-products after SHS. In addition, pH and temperature changes during leaching were analyzed and an innovative application of modified leaching with H2O2 and carbonic acid addition was investigated. The results showed that by optimizing the process steps for the synthesis of B4C–TiB2 composite nanoparticle by the SHS method, a commercial grade product with a surface area of 30.6 m2/g, and a particle size of 193 nm was obtained.Öğe Flue gas desulfurization by using calcined dolomite(Institute of Physics Publishing, 2019) Başlayıcı, Serkan; Buğdaycı, Mehmet; Turan, Ahmet; Öncel, Levent; Açma, Ercan; R., Hristov; R., DimitrovSO2 emissions has begun to cause serious problems in industrialized countries. Today, various methods are used for removal of SO2 gas. SO2 gas is an important raw material for production of sulfuric acid. However, SO2 content of flue gas must be over 6% to produce sulfuric acid commercially. Flue gases, which don't have enough amount of SO2 to produce sulfuric acid commercially are harmful to the environment and human health and they must be filtered. In this study, calcined dolomite was used to remove SO2 in flue gas which doesn't have enough SO2 to produce sulfuric acid but have high emission values. Pyrite was used as SO2 source and SO2 removal efficiency of dolomite was determined for different experimental parameters. SO2 capturing system was thermodynamically modeled and SO2 capturing efficiency was determined as 77.81% in the experiments.
