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Dive into the research topics where Mehmet Buğdaycı is active.

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Featured researches published by Mehmet Buğdaycı.


High Temperature Materials and Processes | 2018

Effect of Reductant Type on the Metallothermic Magnesium Production Process

Mehmet Buğdaycı; Ahmet Turan; Murat Alkan; Onuralp Yucel

Abstract This paper is a contribution to the theoretical and quantitative understanding of the processes for the production of magnesium metal by metallothermic process in vacuum (Pidgeon Process). In the present study, effects of reductant type and amount were investigated. CaC2 is a low-cost alternative to FeSi (ferrosilicon) which is the common reductant in the Pidgeon Process. CaC2 slightly decreases the Mg recovery ratios but it remarkably decreases the process cost. The experimental study, conducted with the change of mass % FeSi–CaC2 ratio at 1,250 °C for 360 min, the optimum Mg recovery was measured as 94.7 % at 20 % CaC2 addition. Also aluminum, as a reductant, allows conducting the process at lower temperatures than that of FeSi. For the experiments conducted with Al addition, the highest Mg recovery ratio was measured as 88.0 % in the conditions for 300 min process duration and 100 % stoichiometric Al addition at 1,200 °C.


High Temperature Materials and Processes | 2014

Self-propagating High Temperature Synthesis of TiB2

Ahmet Turan; Mehmet Buğdaycı; Onuralp Yucel

Abstract Self-propagating high temperature synthesis (SHS) is a very important technique for the synthesis of high technology ceramics, metals and alloys. SHS parameters of TiB2 were carried out in this study. Mg stoichiometry as reductant, process atmosphere and addition of NaCl and MgSO4·7H2O additives were investigated. HCl leaching was applied to SHS products to purify their TiB2 contents. Stoichiometrically 100% Mg addition ratio and Ar atmosphere were determined as the optimum parameters. NaCl addition was also positively affected the specific surface area values. 11.78 m2/g specific surface area value was measured for 5.0% NaCl addition ratio.


TMS Annual Meeting & Exhibition | 2018

Thermodynamic Modelling of Magnesium-Oxide, Calcium-Oxide and Strontium-Oxide Reduction Systems via Pidgeon Process

Mehmet Buğdaycı; Kerem Can Tasyürek; Onuralp Yucel

This paper is a contribution to the theory and quantitative understanding of the processes for the production of magnesium, calcium and strontium metals by metallothermic process. In the present study, effect of reductant type was investigated. Thermodynamic simulation of system was made by Fact Sage 6.4 program. In order to produce magnesium metal, effects of reductants “FeSi, Al, Si and CaC2” were investigated. To understand Calcium-oxide reduction system, effects of Al and CaF2 addition were investigated for different temperatures. In the last simulations, SrO reduction parameters were simulated. Al used as main reductant and BaO, CaO, CaC2 were added to green mixture as a functional additive. Finally probable phases and minimum reduction temperatures are determined.


High Temperature Materials and Processes | 2018

Production of Iron Based Alloys from Mill Scale through Metallothermic Reduction

Mehmet Buğdaycı; Murat Alkan; Ahmet Turan; Onuralp Yucel

Abstract Mill scale (MS) has a potential to use as an iron source because of its high iron content. MS mainly consists of a mixture of iron oxides, metallic iron and other base metal oxides. MS is formed on the surfaces of steel ingots during continuous casting as a waste material. In this study, the use of MS as an iron source for the production of carbon-free iron containing alloys (unalloyed iron, Fe-Ni, Fe-Cr-Ni, Fe-Cr-Ni-Mo) via a metallothermic reduction process was investigated. Thermodynamic calculations and the experimental studies were performed on the basis of 100 g of MS. The effects of different stoichiometric amounts of MS and aluminum (Al) powders (as reductant) were investigated for the production of unalloyed Fe. While, different amount of metal oxide ratios and their effects on metal recoveries, compositions and microstructure of final alloys were studied during Fe-based alloys production. The highest iron recovery during unalloyed Fe production was obtained as 95.14 % by using 100 g of MS and 100 % stoichiometric Al (28.6 g) containing mixture. In Fe-based alloys production series, the highest metal recovery values were reached up to 95.0 % for Fe, 95.1 % for Ni, 68.3 % for Cr and 77.2 % for Mo, respectively.


Archive | 2016

Production of ZrB2-B4C Composite Materials via SHS Process

Kagan Benzesik; Mehmet Buğdaycı; Ahmet Turan; Onuralp Yucel

ZrB2 and B4C are one of the most significant advanced ceramics. They are being used in various industrial areas from space technology to nuclear industry owing to their physical properties such as high melting point, high thermal/electrical conductivity and low density. Present study was conducted in two main stages: Self-propagating high-temperature synthesis (SHS) reactions and leaching. ZrO2, Carbon black, B2O3 were used as starting material to produce ZrB2-B4C powders by SHS. Also Mg powder was used as the reductant. The reaction mixtures (approximately 100 g) were mixed thoroughly 15 minutes in a turbula mixer and charged into Cu crucible and compacted. W (tungsten) wire was placed at the top of copper crucible and the reaction realized by passing current through the wire. After initiation, a highly exothermic reaction became in a self-sustaining mode and propagated throughout the SHS mixture. The samples were characterized by using AAS and X-Ray Diffraction.


Archive | 2016

Effect of the Reductants on the Production of Iron Based Alloys from Mill Scale by Metallothermic Process

Mehmet Buğdaycı; Ahmet Turan; Murat Alkan; Onuralp Yucel

In this study, iron based alloys (Fe, Fe-Cr-Ni-Mo, etc.) were produced by using metallothermic methods starting from Mill Scales obtained continuous casting processes. During the process, the combustion was realized by ignition and the produced wave propagates throughout the reactant mixture yielding the desired product. In this work, Mil scale used as an iron source, which includes +2, +3 values iron oxides. Aluminum, Magnesium and Silicon were used as reductants. In these metallothermic experiments, different ratios of reductants were examined, and their effects on the metal recovery and alloy compositions were investigated. The samples were characterized by using chemical analysis (AAS), XRD and XRF techniques.


6th International Symposium on High-Temperature Metallurgical Processing | 2015

Production of ZrB2‐TiB2 Ceramic Composite Powders by SHS

Mehmet Buğdaycı; Ayşe Ece Yıldızçelik; Onuralp Yucel

ZrB2 and TiB2 are significant metal borides. They are being used in various industrial areas from space technology to nuclear industry owing to their physical properties such as high melting point, high thermal/electrical conductivity and low density. Present study was conducted in two main stages: self-propagating high-temperature synthesis (SHS) reactions and leaching. ZrO2, TiO2, B2O3 were used as starting material and Mg was used as a reductant to produce ZrB2-TiB2 powders via SHS. Therefore, it was aimed to determine production parameters, leaching conditions and comprehensive examination of final product features. The samples were characterized by using chemical analysis (AAS), XRD, XRF and SEM/EDS techniques.


6th International Symposium on High-Temperature Metallurgical Processing | 2015

Production of CrB2 Powder Via Self Propagating High Temperature Synthesis

Buket Tunçer; Mehmet Buğdaycı; Onuralp Yucel

ZrB2 and TiB2 are one of the most significant metal borides. They are being used in various industrial areas from space technology to nuclear industry owing to their physical properties such as high melting point, high thermal/electrical conductivity and low density. Present study was conducted in two main stages: Self-propagating high-temperature synthesis (SHS) reactions and leaching. ZrO2, TiO2, B2O3 were used as starting material and Mg used as a reductant to produce ZrB2-TiB2 powders via SHS. Therefore, it was aimed to determine production parameters, leaching conditions and comprehensive examination of final product features. The samples were characterized by using chemical analysis (AAS), XRD, XRF and SEM/EDS techniques.


5th International Symposium on High-Temperature Metallurgical Processing | 2014

A Comparative Study on the Reduction of Mill Scale from Continuous Casting Processes

Mehmet Buğdaycı; Ahmet Turan; Murat Alkan; Fahri Demirci; Onuralp Yucel


4th International Symposium on High-Temperature Metallurgical Processing | 2013

Production of Fe‐Based Alloys by Metallothermic Reduction of Mill Scales from Continuous Casting Processes

Mehmet Buğdaycı; Murat Alkan; Onuralp Yucel

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Onuralp Yucel

Istanbul Technical University

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Murat Alkan

Istanbul Technical University

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Kerem Can Tasyürek

Istanbul Technical University

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Buket Tunçer

Istanbul Technical University

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Fahri Demirci

Istanbul Technical University

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Kagan Benzesik

Istanbul Technical University

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