Yazar "Yurdakul, Hilmi" için listeleme
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Analytical transmission electron microscopy observations on the stability of TiCN in electrically conductive alpha-beta SiAlON/TiCN composites
Yurdakul, Hilmi; Turan, Servet; Ayas, Erhan; Tunckan, Orkun; Kara, Alpagut (Elsevier Sci LTD, 2014)Coating of alpha-beta SiAlON granules with TiCN powder led to a continuous 3D electrically conductive network formation. Here, the stability of TiCN grains following gas pressure sintering (GPS) and its effect on the ... -
Co-doped willemite ceramic pigments: Technological behaviour, crystal structure and optical properties
Özel, Emel; Yurdakul, Hilmi; Turan, Servet; Ardit, Matteo; Cruciani, Giuseppe; Dondi, Michele (Elsevier Sci LTD, 2010)Cobalt-doped willemite is a promising blue ceramic pigment, but some important aspects concerning crystal structure, optical properties and technological behaviour are still undisclosed. In order to get new insight on these ... -
Effect of sintering conditions and heat treatment on the properties, microstructure and machining performance of alpha-beta-SiAlON ceramics
Açıkbaş, N. Çalış; Yurdakul, Hilmi; Mandal, Hasan; Kara, Ferhat; Turan, Servet.; Kara, Alpagut; Bitterlich, B. (Elsevier Sci LTD, 2012)The properties of SiAlON ceramics are strongly affected by the composition and structure of the intergranular phase, which are controlled by dopants, sintering conditions and starting silicon nitride (Si3N4) powder ... -
The efforts on utilization of Borax solid wastes in wall tile bodies
Karasu, Bekir; Kaya, Güray; Yurdakul, Hilmi; Topkaya, A. (2003)Recycling attempts of many different kind of by-products or wastes released from various industrial branches are of importance. Kyrka borax deposits run by Etibank of Turkey, dumps considerable amounts of wastes with high ... -
Electric field effects on CNTs/vinyl ester suspensions and the resulting electrical and thermal composite properties
Yurdakul, Hilmi; Seyhan, Abdullah Tuğrul; Turan, Servet; Tanoğlu, Metin; Bauhofer, Wolfgang; Schulte, Karl (Elsevier Sci LTD, 2010)In this study, electrical conductivity of a vinyl ester based composite containing low content (0.05, 0.1 and 0.3 wt.%) of double and multi-walled carbon nanotubes with and without amine functional groups (DWCNTs, MWCNTs, ... -
An experimental and theoretical examination of the effect of sulfur on the pyrolytically grown carbon nanotubes from sucrose-based solid state precursors
Küçükayan, Gökçe; Ovali, Rasim; Ilday, Serim; Baykal, Beril; Yurdakul, Hilmi; Turan, Servet; Bengü, Erman (Pergamon-Elsevier Science LTD, 2011)Multi-walled carbon nanotubes (MWCNTs) were synthesized through pyrolysis of the sulfuric acid-carbonized byproduct of sucrose. While the presence of sulfur in the reaction media has a key role in the formation and population ... -
First-principles investigation of titanium doping into beta-SiAlON crystal in TiN-SiAlON composites for EDM applications
Kandemir, Ali; Sevik, Cem; Yurdakul, Hilmi; Turan, Servet (Elsevier Science Sa, 2015)Following the experimental work on the incorporation of titanium into beta-SiAlON crystal in TiN-SiAlON composites for electrical discharge machining (EDM) applications, Ti doping mechanisms in beta-Si6-z AlzOzN8-z have ... -
Geçirimli elektron mikroskopi (TEM) teknikleri ile SiAlON esaslı malzemelerin atomik ölçekte karakterizasyonu
Yurdakul, Hilmi (Anadolu Üniversitesi, 2012)Bu tez çalışmasının amacı, çeşitli geçirimli elektron mikroskobu (TEM) teknikleri ile SiAlON esaslı malzemeleri atomik ölçekte karakterize etmektir. Literatürde ilk defa, sonuçlar göstermiştir ki: (i) Yb ve Ce atomları ... -
Identification and quantification of reaction phases at Si3N4-Ti interfaces by using analytical transmission electron microscopy techniques
Tunckan, Orkun; Yurdakul, Hilmi; Turan, Servet (Elsevier Sci LTD, 2013)Silicon nitride (Si3N4) and titanium (Ti) were successfully bonded by using a capacitor discharge joining method. The resulting sample interfaces were characterized by scanning electron microscopy (SEM) and analytical ... -
Identification of Ti incorporation into beta-SiAlON crystal structure through transmission electron microscopy techniques
Yurdakul, Hilmi; Turan, Servet (Elsevier Sci LTD, 2012)In this paper, we report the transmission electron microscopy (TEM) observations on the incorporation of Ti transition metal element into beta-SiAlON crystal structure in a bulk beta-SiAlON-TiN composite material. Considering ... -
Incorporation of the transition metals (Cr and Fe) into beta-SiAlON crystal structure
Yurdakul, Hilmi; Turan, Servet (Elsevier Sci LTD, 2011)Outstanding properties for SiAlON ceramics can be obtained by tailoring the microstructure through alpha-SiAlON and beta-SiAlON phase content as well as a type of secondary phases. It is so far well known that while some ... -
The mechanism for the colour change of iron chromium black pigments in glazes through transmission electron microscopy techniques
Yurdakul, Hilmi; Turan, Servet; Özel, Emel (Elsevier Sci LTD, 2011)Black iron chromium (Fe-Cr) bearing oxide pigments are generally utilised as effective colourants in a wide variety of applications. However, in the case of their use within ZnO-containing glazes, they yield an undesirable ... -
Microstructural characterization of corn starch-based porous thermoplastic composites filled with multiwalled carbon nanotubes
Yurdakul, Hilmi; Durukan, Oya; Seyhan, Abdullah Tuğrul; Çelebi, Hande; Öksüzoğlu, Mustafa; Turan, Servet (Wiley, 2013)Microstructural characterization of corn starch-based porous thermoplastic (TPS) composites containing various contents (0.1, 0.5, and 1 wt %) of multiwalled carbon nanotubes (MWCNTs) was performed. Corn starch was plasticized ... -
Nanoscopic characterization of two-dimensional (2D) boron nitride nanosheets (BNNSs) produced by microfluidization
Yurdakul, Hilmi; Göncü, Yapmcak; Durukan, Oya; Akay, Atakan; Seyhan, Abdullah Tuğrul; Ay, Nuran; Turan, Servet (Elsevier Sci LTD, 2012)A microfluidizer high pressure fluid processor is successfully conducted for the first time to exfoliate few layer two dimensional (2D) boron nitride nanosheets (BNNSs) from micro-sized hexagonal boron nitride (h-BN) ... -
A novel approach on the synthesis of beta-SiAlON:Eu2+ phosphors from kaolin through carbothermal reduction and nitridation (CRN) route
Yurdakul, Hilmi; Ceylantekin, R.; Turan, Servet (Taylor & Francis LTD, 2014)Doping beta-SiAlON crystal structure with rare earths leads to a superior tuneable luminescence properties for light emitting diodes (LEDs). However, the widely used conventional methods require high purity starting powders ... -
Synthesis of Phosphorus Included Multiwalled Carbon Nanotubes by Pyrolysis of Sucrose
Küçükayan-Doğu, Gökçe; Sen, H. Şener; Yurdakul, Hilmi; Turan, Servet; gülseren, Oğuz; Bengü, Erman (American Chemical Society, 2013)Multiwalled carbon nanotubes (MWCNT) were synthesized by a pyrolysis route which involves a dehydration step using phosphoric acid. The resultants were found to be mostly containing amorphous carbon with scattered MWCNTs ... -
Towards atomic scale engineering of rare-earth-doped SiAlON ceramics through aberration-corrected scanning transmission electron microscopy
Yurdakul, Hilmi; Idrobo, Juan C.; Pennycook, Stephen J.; Turan, Servet (Pergamon-Elsevier Science LTD, 2011)Direct visualization of rare earths in alpha- and beta-SiAlON unit-cells is performed through Z-contrast imaging technique in an aberration-corrected scanning transmission electron microscope. The preferential occupation ... -
The Valance Determination of Cerium Ions in alpha-SiAlON by Electron Energy Loss Spectroscopy Analysis
Yurdakul, Hilmi; Turan, Servet (Cambridge University Press, 2008)…
