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Öğe A COMPARATIVE STUDY ABOUT PRODUCTION OF VANADIUM CARBIDE VIA SELF PROPAGATING HIGH TEMPERATURE SYNTHESIS AND REDUCTION(Polska Akad Nauk, Polish Acad Sciences, Inst Metall & Mater Sci Pas, 2024) Bugdayci, Mehmet; Oncel, Levent; Alkan, Murat; Turan, Ahmet; Cinarli, UmayVanadium carbide is important for industrial applications because of its high hardness, high temperature resistance, high chemical, and thermal stability. It is generally obtained from the reaction between V and C powders at a high temperature ranging from 1100 to 1500 degrees C. Investigations on these high strength, high abrasion resistant, hard materials have been intensified in recent years and consequently, significant improvements have been achieved. In this study, VC alloys are produced with low cost processes, by reducing the oxides of their components by SHS methods and ball mill-assisted carbothermal reduction. In the experimental stage, V2O5 was used as oxidized Vanadium source, Cblack as carbon source, magnesium and Cblack as reductant. In the study, VC powders were synthesized by two different methods and optimum production conditions were determined. Furthermore, the effect of different stoichiometric charge components and the effect of experiment durations were realized by X-ray diffraction, HSC Chemistry, and SEM analyses for different reductants.Öğe Advances in Combustion Synthesis and Technology(Bentham Science Publishers, 2022) Bugdayci, Mehmet; Oncel, LeventThis reference is an accessible update on combustion synthesis and the chemical technology for synthesizing composite materials. Nine chapters offer an overview of the subject with recent references, giving the reader an informed perspective. The book starts with an introduction to thermodynamic models used in combustion synthesis. Subsequent chapters explain the application of combustion synthesis to manufacture different materials such as nanostructured non-ferrous alloys, ceramic powders, functionally graded materials, boron carbide-based superhard materials, shape memory alloys, biomaterials, high-entropy alloys and rare earth phosphates. The range of topics makes this book a useful guide for students, scientists and industrial professionals in the field of chemical engineering, metallurgy and materials science. © 2022, Bentham Books imprint.Öğe Biodegradable Implant Materials(wiley, 2022) Oncel, Levent; Bugdayci, MehmetImplants are medical devices that have critical importance for human health. The functions expected from implant materials have increased with the advancement of medicine and engineering. Implants are used for different purposes in different areas of the body. While some implants must be permanent in the body to fulfill their duties, some implants must be removed from the implanted area after a certain period. If an implant is to be removed from the relevant area after a certain period, an operation is required for this and then, there will be a healing process. The use of biodegradable implant materials eliminates the need for this additional operation. Biodegradable materials leave their place to the tissue gradually in a certain period. Biodegradable implant materials are one of the popular research areas today and many studies are carried out in this field every year. In this chapter, information about implants, biomaterials, biodegradability concept, biodegradable metals, and biodegradable polymers is shared. Also, examples of the use of biodegradable materials in biomedical applications are included. © 2022 Scrivener Publishing LLC.Öğe Carbon Materials for Nanogenerators(CRC Press, 2022) Bugdayci, Mehmet; Oncel, Levent[No abstract available]Öğe Production of Shape Memory Alloys with Combustion Synthesis(Bentham Science Publishers, 2022) Oncel, LeventShape memory alloys(SMAs) have become an important class of materials following the discovery of the shape memory effect(SME) in nitinol in 1963. The important properties of these alloys have paved the way for their use in various applications. Combustion synthesis has become an important production method because of its advantages. The production of SMAs by combustion synthesis is a subject that has been studied in recent years. The use of porous nitinol produced by this method in artificial bone implants has become a particularly remarkable issue in this area. In this section, information about SMAs and combustion synthesis will be shared, and then information about the studies conducted on the production of SMAs by combustion synthesis will be shared. © 2022, Bentham Science Publishers.Öğe Thermodynamic modeling and production of FeCo alloy from mill scale through metallothermic reduction(Elsevier - Division Reed Elsevier India Pvt Ltd, 2020) Bugdayci, Mehmet; Deniz, Gul; Ziyreker, Ceren; Turan, Ahmet; Oncel, LeventMill scale is a waste material arises during the continuous casting of steel. It contains approximately 70% iron by mass. Mill scale is used as an iron source in many applications to reduce costs. In this study, it was aimed to produce FeCo alloy through the metallothermic reduction of mill scale and Co3O4. The metallothermic reduction was chosen because of its advantages such as minimum energy need, short process time and no need for high-tech equipment. The system was thermochemically simulated with FactSage and HSC software. In the experimental studies, the effects of the use of aluminium, as a reductant, in different stoichiometries on total metal recovery yield were investigated. The effects of aluminium stoichiometry on hardness and microstructure were also investigated. As a result of the experimental studies, it was seen that highest metal recovery yields were obtained as 81.25% for iron and 93.78% for cobalt with the mixture including 105% stoichiometric aluminium. (c) 2020 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Öğe Thermodynamic modeling, metallothermic synthesis, and characterization of ferrotitanium(Walter De Gruyter Gmbh, 2025) Oncel, LeventFerrotitanium is widely used in alloying stainless steels to enhance their strength, corrosion resistance, and high-temperature resistance. Ferrotitanium's advantages over pure titanium - such as better solubility in the liquid steel bath and lower cost - have made it the preferred choice in stainless steel alloying. In this study, it was aimed to produce ferrotitanium alloy through the metallothermic reduction of Fe2O3 and TiO2. The system's thermodynamic modeling was performed using HSC Chemistry 6.12 and FactSage 7.1. The experimental studies investigated the effect of using aluminum as a reductant with varying stoichiometries on the total metal recovery yield, hardness, and microstructure. Atomic absorption spectrometry (AAS), optical microscopy, scanning electron microscopy (SEM), X-ray fluorescence spectrometry (XRF), and hardness measurement techniques were employed in characterization studies. The results of the experimental studies showed that the highest metal recovery yields were obtained with 105 % stoichiometric aluminum as 97.9 % for Fe and 100 % for Ti.
