Toksoy, Muhammet Fatih
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Toksoy, Fatih
Fatih Toksoy, M.
Toksoy, Muhammet F.
Toksoy, M. Fatih
Toksoy, M. F.
Toksoy, M.
Toksoy, M
Toksoy, F
Toksoy, F.
Fatih Toksoy, M.
Toksoy, Muhammet F.
Toksoy, M. Fatih
Toksoy, M. F.
Toksoy, M.
Toksoy, M
Toksoy, F
Toksoy, F.
Job Title
Email Address
fatihtoksoy@iyte.edu.tr
Main Affiliation
03.10. Department of Mechanical Engineering
Status
Current Staff
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
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3GOOD HEALTH AND WELL-BEING
1
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4QUALITY EDUCATION
0
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
0
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7AFFORDABLE AND CLEAN ENERGY
0
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8DECENT WORK AND ECONOMIC GROWTH
0
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
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13CLIMATE ACTION
1
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14LIFE BELOW WATER
0
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15LIFE ON LAND
0
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
14
Citations
261
h-index
7
Documents
12
Citations
280
Scholarly Output
8
Articles
5
Views / Downloads
2465/2425
Supervised MSc Theses
3
Supervised PhD Theses
0
WoS Citation Count
27
Scopus Citation Count
29
Patents
0
Projects
4
WoS Citations per Publication
3.38
Scopus Citations per Publication
3.63
Open Access Source
5
Supervised Theses
3
| Journal | Count |
|---|---|
| International Journal of Applied Ceramic Technology | 3 |
| Atmospheric Pollution Research | 1 |
| Processing and Application of Ceramics | 1 |
Current Page: 1 / 1
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8 results
Scholarly Output Search Results
Now showing 1 - 8 of 8
Master Thesis Production of Yttria-Stabilized Zirconia by Precipitation Method(01. Izmir Institute of Technology, 2024) Toksoy, Muhammet Fatih; Haykır, Ali Mert; Toksoy, Muhammet FatihZirkonya üstün özellikleri nedeniyle birçok endüstriyel alanda kullanılmaktadır ancak faz stabilizasyonun dengesizliği onu yüksek performans gerektiren alanlarda kullanılmasında bir dezavantaj yaratmaktadır. İtriyum (III) oksite seramikler için güçlü bir stabilizer olarak bilinmektedir. Bunun sonucunda bilim insanları zirkonyayı itriyum (III) oksit ile stablize etmeye karar vermişlerdir. Bu çalışmada geleneksel yöntemlerin dışına çıkılarak zirkonyanın çöktürme yöntemi kullanılarak itriyum tuzundan yttria elde edilerek stabilizasyonu sağlanmış zirkonya üretimi hedeflenmiştir. Çöktürme yöntemini kullanmanın amacı diğer üretim metotlarına kıyasla daha küçük tane boyutu, daha homojen bir görünüm, daha az poroziteye sahip itriyum (III) oksit ile stabilize edilmiş zirkonya elde etmektir. Ayrıca çöktürme yöntemi sayesinde daha önce üretimi yapılamamış %2 itriyum (III) oksit katkılı zirkonya üretimi de gerçekleştirilmiştir ve 1600 derecede sinterleme işlemine tabii tutulmuştur. Sinterleme işlemi sırasında faz geçiş sıcaklığı olan 1170 derece bu çalışmanın en önemli noktalarından biri olmuştur. Bu çalışmanın temel amacı itriyum (III) oksit ile stabilize edilmiş zirkonya üretiminde çöktürme yönteminin avantajlarını ortaya koymak ve malzeme özelliklerini iyileştirmektir. Çöktürme yöntemi sayesinde %2 itriyum (III) oksit katkılı zirkonya üretimi gerçekleştirilerek bu yöntemin malzeme özelliklerindeki iyileştirmeleri ortaya konulmuştur. Ayrıca çöktürme yönteminin avantajları olan küçük tane boyutu, düşük porozite ve homojen yapı da vurgulanmıştır.Master Thesis Production of Composite Based Friction Materials Using Waste Gg25 Casting Material for Safety Clutches in Aviation Applications(01. Izmir Institute of Technology, 2024) Çelik, Ceren; Toksoy, Muhammet FatihHavacılık sektöründe uçak motorları ile diğer bileşenler arasındaki gücün verimli ve güvenli bir şekilde aktarılmasını sağlayan kavrama balataları, sürdürülebilir malzemeler kullanılarak üretildiğinde hem performans hem de çevresel açıdan kritik öneme sahiptir. Bu çalışmanın amacı, uçak debriyaj sistemlerinde kullanılmak üzere GG25 atık metal lifleri içeren kompozit debriyaj balatası malzemeleri geliştirmektir. Sürdürülebilir bir üretim yaklaşımı ile geliştirilen bu balatalar hem malzeme geri dönüşümünü destekler hem de aşınma direnci gibi önemli avantajlar sunar. Bu çalışmada, ticari kompozit esaslı karama balatalarında kullanılan hammaddeler hakkında detaylı bir bakış açısı edinebilmek amacıyla mikroyapı analizleri, mineral faz analizi ve termal analiz gerçekleştirilmiştir. Havacılık uygulamalarına uygun kompozit sürtünme malzemesini oluşturan bileşenler, elde edilen karakterizasyon çalışmaları ve firma AR-GE çalışmalarından sağlanan bilgi birikimi doğrultusunda belirlenmiştir. Toz metalurjisi yöntemi ile üretim yapılan numuneler ball-on tipi aşınma test cihazı ile aşındırılmış ve sürtünme katsayısı ve aşınma direnci belirlenmiştir. Aşınan yüzeylerden alınan optik mikroskop ve SEM-EDS analiz görüntüleri değerlendirilmiştir. Değerlendirmelerin sonucunda, GG25 döküm atığı kullanılan numuneler, sürtünme katsayısı ve yoğunluğu açısından çeliğe benzer özellikler sunsa da sertlik ve aşınma direnci bakımından daha geridedir. Bu sonuçlar, pahalı çelik liflerin yerine geri dönüştürülebilir döküm atıklarının başarılı bir şekilde değerlendirilebileceğini ortaya koymaktadır. Atık durumdaki metal liflerinin, sürtünme, aşınma ve maliyet dengesini etkin bir şekilde sağlayabileceği ve standart uygulamalarda yeterli performansı karşılayabileceği öngörülmektedir.Article Citation - WoS: 9Citation - Scopus: 9Modification of Commercial Boron Carbide Powder Using Rapid Carbothermal Reduction(John Wiley and Sons Inc., 2019) Toksoy, Muhammet Fatih; Haber, Richard A.Non-uniform morphology and existence of free carbon are two main problems for commercial boron carbide powders. This work proposes a method for eliminating free carbon and changing the morphology of commercial powders using Rapid Carbothermal Reduction (RCR) process. Free carbon is eliminated from commercial boron carbide powders and morphology is evolved to less angular shapes with limited particle size growth. Commercial and modified powders were densified by Spark Plasma Sintering at 1900 degrees C with 0, 5, and 20 minutes dwell. Despite the particle size growth, modified boron carbide powders reached >99% TD with shorter dwell times compared with commercial starting powders. Improved microhardness observed with dense modified samples as a result of enhanced morphology and increased twinning.Article Citation - WoS: 18Citation - Scopus: 19Densification and Characterization of Rapid Carbothermal Synthesized Boron Carbide(John Wiley and Sons Inc., 2017) Toksoy, Muhammet Fatih; Rafaniello, William; Xie, Kelvin Yu; Ma, Luoning; Hemker, Kevin Jude; Haber, Richard AlanSubmicrometer boron carbide powders were synthesized using rapid carbothermal reduction (RCR) method. Synthesized boron carbide powders had smaller particle size, lower free carbon, and high density of twins compared to commercial samples. Powders were sintered using spark plasma sintering at different temperatures and dwell times to compare sintering behavior. Synthesized boron carbide powders reached >99% TD at lower temperature and shorter dwell times compared to commercial powders. Improved microhardness observed in the densified RCR samples was likely caused by the combination of higher purity, better stoichiometry control, finer grain size, and a higher density of twin boundaries.Article Citation - Scopus: 1A Proposal of Indoor Air Pollutant Limit Values for Turkish Schools Based on a Literature Review of Emission Sources, Concentrations, Health Effects, and Limits/Guidelines(Turkish National Committee Air Pollution Research & Control-TUNCAP, 2026) Sofuoglu, Sait Cemil; Ari, Akif; Civan, Mihriban; Dumanoglu, Yetkin; Gullu, Gulen; Mentese, Sibel; Toksoy, MacitLimit Values Working Group (LVWG) was established under Indoor Air Quality Committee of Turkish Climatization Assembly of the Union of Chambers and Commodity Exchanges of T & uuml;rkiye. LVWG was tasked with reviewing the pertinent literature on indoor emission sources, concentrations in schools, health effects, and existing limit and guideline values to identify the indoor air pollutants that need to be addressed and to be recommended a limit value for Turkish schools. LVWG members took responsibilities based on their individual expertise. The recommendations were concluded in consensus decision-making after in-group discussions. A total of 19 pollutants/pollutant groups (carbon dioxide, carbon monoxide, nitrogen dioxide, ozone, radon, volatile organic compounds, formaldehyde, trihalomethanes, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, brominated flame retardants, organophosphate esters, phthalate esters, particulate matter, bioaerosols (bacteria, fungi, viruses), microbial pollutants and allergens) were reviewed. Limit values were recommended for 11 pollutants/groups based on the current knowledge, i.e. pollutant health effects and indoor air concentrations taking into account the exposure duration, the prevalence of existing limit/guideline values and the health effects on which they are based.Article Homogeneity Enhancement of Oxide Additives in Boron Carbide by Precipitation Method(University of Novi Sad, Faculty of Technology, 2025) Toksoy, M.F.; Elçi, C.This study elucidates the use of the precipitation method to enhance the uniformity of oxide additives in boron carbide ceramics. Achieving a homogeneous distribution of additives is critical, as higher additive content tends to degrade the mechanical properties of boron carbide. In this research, yttrium and aluminium hydroxide salts were dispersed and incorporated into boron carbide slurry under highly alkaline conditions. The mixture was aged and subsequently calcined to produce metal oxide layers around the boron carbide particles. The additive-to-boron carbide ratio and calcination conditions were systematically varied and the resulting powders were characterized using SEM, EDX and zeta potential analyses. The precipitation method effectively improved additive dispersion, achieving a uniform distribution. Furthermore, samples processed through precipitation exhibited higher densities compared to conventional benchmark samples. © 2025 University of Novi Sad, Faculty of Technology. All rights reserved.Master Thesis Optimization of Oxide Additives in Boron Carbide Powders Using Precipitation Method(Izmir Institute of Technology, 2019) Elçi, Caner; Toksoy, Muhammet FatihThis study aims to precipitate oxides to boron carbide powders to achieve homogeneous dispersion of additive which is essential for sintering. Fine boron carbide powders were suspended in distilled water, then nitrate salts were solved in alcohol. Solved nitrate salts were fed to mixture in high pH levels. Mixing stage of the precipitation was done with both magnetic stirrer and ultrasonic treatment to investigate the effect of the mixing method. After the precipitation, synthesized powders were calcined under various atmospheres to eliminate the inorganic residues from the precipitation process. The examination of the XRD graphs showed that the calcination atmosphere is important for the oxide layer of the boron carbide powders. Inert atmosphere restrained the formation of the boron oxide layer due to the lack of oxygen. Methanol washing also eliminated the boron oxide layer. According to the zeta potential analysis, surface characteristics were obtained better when the ultrasonic treatment was applied during the precipitation. Ultrasonic treatment increased the dispersion of the additives between the particles during the suspension stage of the precipitation. Calcination time also affected the dispersion of the yttrium oxide at the sintered compacts when the SEM images were observed. When the calcination time increased, dispersion of the yttria was getting more agglomerated.Article Regression Analysis of Material Properties and Hardness of Dense Boron Carbide(Wiley, 2025) Toksoy, M. Fatih; Haber, Richard A.Material properties directly affect the final performance of the produced articles. This study aims to establish a correlation between materials properties and hardness of boron carbide samples. Ten different boron carbide powders were sintered to high densities by spark plasma sintering, and material properties (grain size, density, stoichiometry, and free carbon) were analyzed. Hardness tests were conducted on these samples. All experimental procedures were completed by a single operator, and the same instruments were used for all the samples. Multiple linear regressions using the ordinary least squares method in SPSS were carried out to identify the relationship between hardness and material properties. Analyses showed density is the most dominant property, surpassing any other parameter. Grain size became more dominant at higher densities (>99%) and affected hardness results. Both grain size and density are the result of the starting powder and the densification procedure. This study showed that 80% of the hardness variation can be explained by this model.