Yazar "Bugdayci, Mehmet" seçeneğine göre listele

Listeleniyor 1 - 9 / 9
  • [ X ]
    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, Umay
    Vanadium 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.
  • [ X ]
    Öğe
    Advances in Combustion Synthesis and Technology
    (Bentham Science Publishers, 2022) Bugdayci, Mehmet; Oncel, Levent
    This 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.
  • [ X ]
    Öğe
    Al2O3 Recovery From Waste Tetra Pak Packages
    (Erciyes Üniversitesi, 2023) Bugdayci, Mehmet; Turan, Ahmet; Öncel, Levent; Bayiroglu, Fatih
    In this study, it was aimed to obtain Al2O3 from waste Tetra Pak packages by using the hydrometallurgical method. Tetra Pak recycling has become an increasingly researched topic around the world. Cellulose, polyethylene and aluminum, which form the structure of Tetra Pak packages, are raw materials that can be reused after recycling. Cellulose was separated from Tetra Pak's structure by hydropulping process and polyethylene was separated from Tetra Pak's structure by leaching with HCl, and optimum parameters of these processes were investigated in experimental studies. Aluminum in the structure was dissolved in acid solution with 100% efficiency in the experiments carried out with 0.1750 M and 0.1312 M acid concentration. Aluminum, which was dissolved in acid solution, was obtained as the AlCl3 phase and precipitated as Al(OH)3 with the addition of 100% stoichiometric NaOH, and the precipitates were calcined at 950 °C for 1 hour to obtain the Al2O3 structure. The materials used in the experimental studies and the products obtained as a result of these experiments were analyzed by Atomic Absorption Spectrometry (AAS), Fourier Transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) / Energy-Dispersive X-ray Spectroscopy (EDS), and optical microscopy techniques.
  • [ X ]
    Öğe
    Biodegradable Implant Materials
    (wiley, 2022) Oncel, Levent; Bugdayci, Mehmet
    Implants 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.
  • [ X ]
    Öğe
    Carbon Materials for Nanogenerators
    (CRC Press, 2022) Bugdayci, Mehmet; Oncel, Levent
    [No abstract available]
  • [ X ]
    Öğe
    Preface
    (Bentham Science Publishers, 2022) Bugdayci, Mehmet; Oncel, Levent
    [No abstract available]
  • [ X ]
    Öğe
    Production of Fe-B compounds via the self-propagating high-temperature synthesis technique
    (Redakcia Kovove Materialy, 2025) Bugdayci, Mehmet; Oncel, Levent; Benzesik, Kagan
    This study investigated the conditions for self-propagating high-temperature synthesis (SHS) of FeB. Hematite (Fe2O3) and magnetite (Fe3O4) powders were used as iron sources, and phases generated under varied aluminum stoichiometries were identified. The SHS reactions produced loose powder products. Significant levels of impurities were detected in both experimental sets along with the FeB compounds. XRD analysis of the SHS products revealed the presence of only Fe2B and MgO phases. Removal of Mg-based impurities was carried out through HCl leaching at different concentrations. The targeted FeB structure was obtained as intended in the experiments. Optimal conditions were identified as a reduction of the hematite-boron oxide mixture with 110 % stoichiometric Mg and subsequent leaching in 8 M HCl.
  • [ X ]
    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, Levent
    Mill 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/).
  • [ X ]
    Öğe
    Thermodynamic modelling and production of manganese boride compounds via self-propagating high temperature synthesis
    (Taylor & Francis Ltd, 2025) Oncel, Levent; Bugdayci, Mehmet
    Transition metal borides are advanced materials with superior mechanical and thermal properties. Manganese borides combine high hardness with thermal stability and wear resistance, making them suitable for energy-storage parts, magnetic devices, and high-temperature service. In this study, Mn-B compounds were synthesised via self-propagating high-temperature synthesis (SHS) for the first time. The MnO-B2O3-Mg system was thermodynamically modelled in FactSage 7.1 to define the reaction conditions. Experiments were conducted using magnesium as the reductant at stoichiometries ranging from 100% to 115%. XRD showed MgO as the dominant phase at all levels; MgB2 appeared at 100% Mg, and MnB with Mn3B2O6 was present in every composition. Mg-based by-products appeared in all stoichiometries and were removed by acid leaching with 6 M HCl. After leaching, the primary phases were Mn2B, MnB, and MnB2, while boron-related peaks appeared only at 100% stoichiometry. Accordingly, the formation of manganese - boron compounds requires at least 105% Mg stoichiometry. SEM/EDS analysis of the leached sample confirmed the removal of Mg- and O-containing impurities. Since 110-115% offered no advantage but raised magnesium use, 105% was identified as the optimum stoichiometry. These findings confirm SHS as a viable route for producing manganese boride ceramics for advanced applications. Les borures de m & eacute;taux de transition sont des mat & eacute;riaux avanc & eacute;s aux propri & eacute;t & eacute;s m & eacute;caniques et thermiques sup & eacute;rieures. Les borures de mangan & egrave;se combinent une duret & eacute; & eacute;lev & eacute;e & agrave; une stabilit & eacute; thermique et une r & eacute;sistance & agrave; l'usure, ce qui les rend adapt & eacute;s aux pi & egrave;ces de stockage d'& eacute;nergie, aux dispositifs magn & eacute;tiques et aux applications & agrave; haute temp & eacute;rature. Dans cette & eacute;tude, on a synth & eacute;tis & eacute; des compos & eacute;s Mn-B par synth & egrave;se autopropag & eacute;e & agrave; haute temp & eacute;rature (SHS) pour la premi & egrave;re fois. On a mod & eacute;lis & eacute; thermodynamiquement le syst & egrave;me MnO-B2O3-Mg dans FactSage 7.1 afin de d & eacute;finir les conditions de r & eacute;action. On a effectu & eacute; des exp & eacute;riences en utilisant le magn & eacute;sium comme agent r & eacute;ducteur & agrave; des st oe chiom & eacute;tries allant de 100% & agrave; 115%. La DRX a montr & eacute; le MgO comme phase dominante & agrave; tous les niveaux; MgB2 apparaissait & agrave; 100% de Mg, et MnB avec Mn3B2O6 & eacute;tait pr & eacute;sent dans toutes les compositions. Des sous-produits & agrave; base de Mg apparaissaient dans toutes les st oe chiom & eacute;tries et & eacute;taient & eacute;limin & eacute;s par lixiviation acide avec du HCl 6 M. Apr & egrave;s lixiviation, les phases principales comprenaient Mn2B, MnB et MnB2, tandis que les pics associ & eacute;s au bore n'apparaissaient qu'& agrave; 100% de st oe chiom & eacute;trie. Par cons & eacute;quent, la formation de compos & eacute;s de mangan & egrave;se-bore n & eacute;cessite une st oe chiom & eacute;trie en Mg d'au moins 105%. L'analyse MEB/EDS de l'& eacute;chantillon lixivi & eacute; a confirm & eacute; l'& eacute;limination des impuret & eacute;s contenant Mg et O. Puisque 110 & agrave; 115% n'offraient aucun avantage mais & eacute;levaient la consommation de magn & eacute;sium, on a identifi & eacute; la st oe chiom & eacute;trie optimale & agrave; 105%. Ces r & eacute;sultats confirment la SHS comme une voie viable pour la production de c & eacute;ramiques de borure de mangan & egrave;se pour des applications avanc & eacute;es.