Kurum Yazarı "Kurama, Semra" WoS İndeksli Yayınlar Koleksiyonu İçin Listeleme
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Investigation of borax waste behaviour in tile production
Kurama, Semra; Kara, Alpagut; Kurama, H. (Elsevier Sci LTD, 2007)Although there are various studies published in the relevant literature on the use of borates in tile production, borax waste has been mainly used in place of feldspar and the results showed that borate migration to the ... -
Investigation of the influence of initial powder size on the optical properties of Dy-alpha-SiAlON ceramics fabricated by gas pressure sintering
Avcıoğlu, Suna; Kurama, Semra (Elsevier Sci LTD, 2017)Translucent Dy3+ doped alpha-SiAlON ceramics were successfully fabricated by the gas pressure sintering (GPS) method. The efficacy of this sintering technique also the affects initial particle size on densification, final ... -
Investigation properties of BaO/RO-Al2O3-R2O3-B2O3-SiO2 glass-ceramic sealants for solid oxide fuel cell
Kurama, Semra; Saydam, Gamze (Australian Ceramic Society, 2017)Glass-ceramics are commonly used as sealing materials for planar solid oxide fuel cells (SOFCs). The major requirements of stack and module builders for these materials are the stability of the coefficient of thermal ... -
Mg+2 and Ce+3 doped alpha-SiAlON ceramics
Kurama, Semra; Mandal, Hasan (Trans Tech Publications LTD, 2004)In the present work, stabilization of MgO and CeO2 in alpha-SiAlON structure is studied. Mg and CeO2 were used in 50:50 molar ratios as additives. The mixture was sintered at 1830degreesC for 1 hour in gas pressure sintering ... -
Microstructural evolution R-alpha-SiAlON ceramics (R=Y, Y+Sm and Sm)
Kurama, Semra; Mandal, Hasan (Trans Tech Publications LTD, 2004)Yttrium or samarium doped alpha-SiAlON composition was sintered using gas pressure sintering through two different sintering procedures. One group of samples was heated up to 1800degreesC and then held for 1 h while another ... -
Optimization of alpha-sialon microstructure by heat treatment
Kurama, Semra (Trans Tech Publications LTD, 2008)Nd-doped alpha-SiAlON starting composition (Nd(0.33)Si(9.38)Al(2.62)O(1.62)N(14.38)) was prepared by gas pressure sintering at 1825 degrees C for 3 hrs. In order to explore the effect of post heat treatment on the developments ... -
Optimization of the optical properties of alpha-SiAlON through a decrease in starting powder size
Kurama, Semra; Avcıoğlu, Suna; Ayas, Erhan (Elsevier Sci LTD, 2015)In the present work, the effects of initial powder size on the sintering behavior and optical properties of Dy-alpha-SiAlON ceramics produced by the SPS technique are investigated. The powders were prepared using high ... -
Oxidation behaviour and kinetics of alpha-SiAlON ceramics
Çorapçıoğlu, Gülcan; Kurama, Semra (Taylor & Francis LTD, 2009)In this study, the oxidation behaviours of Y, Sin and Y/Sm doped alpha-SiAlON ceramics are investigated to examine the oxidation kinetics. The oxidation tests are carried out at 1300-1450 degrees C for different holding ... -
The production of beta-SiAlON ceramics with low amounts of additive, at low sintering temperature
Eser, Onur; Kurama, Semra; Günkaya, Göktuğ (Elsevier Sci LTD, 2010)In the present work nano-sized powder of beta-SiAlON was produced using a wet milling process. Different milling times and mediums (methyl ethyl keton, ethanol and toluene as solvents, polyethyleneglicol, oleic acid, sodium ... -
Production of cordierite ceramic by aqueous tape casting process
Özel, Emel; Kurama, Semra (Elsevier Science Sa, 2008)Tape-casting process was used to produce cordierite ceramics in an aqueous system with polyvinylalcohol (PVA), and polyethyleneglicol (PEG), as binder and plasticizer, respectively. Before starting to tape-casting studies, ... -
The reaction kinetics of rice husk based cordierite ceramics
Kurama, Semra; Kurama, H. (Elsevier Sci LTD, 2008)In this study, rice husk ash (RHA) was used as a silica source for cordierite production. Two different groups of samples were prepared in order to achieve the synthesis of cordierite. In the first group (HS-0), kaolinite, ... -
Resonant Inspection of Ceramic Tiles
Eren, Elif; Kurama, Semra; Stultz, Gail; Sorensen, Scott (Trans Tech Publications LTD, 2013)For as long as there have been metal, steel and other materials, there have been methods and ways to inspect them. The efforts to improve these methods continue to be a work in progress. Non-destructive techniques are ... -
Spark Plasma Sintering of Translucent Dy-Y Doped alpha-SiAlON: Study of Sintering Parameters Influence on the Optical Properties by Using Taguchi Method
Avcıoğlu, Suna; Kurama, Semra (Polish Acad Sciences Inst Physics, 2017)The Taguchi approach was applied to optimize optical properties of Dy-Y doped alpha-SiAlON ceramics produced by spark plasma sintering technique. L'16 experimental design was formed according to orthogonal array. Four ... -
Spinel nitrides transparent ceramics
Kaplan, Şevki Samet; Kurama, Semra; Günkaya, Göktuğ (Elsevier Sci LTD, 2015)Aluminum oxy-nitride (AlON), a solid solution in the binary phase diagram of Al2O3-AlN, is a relatively new spinel type material. In the present study, the optimum sintering agent and sintering conditions of AlON were ... -
Sr2+-Mg2+-doped SiAlON ceramics
Kurama, Semra; Çiğdemir, G; Mandal, Hasan; Herrmann, M (Blackwell Publishing, 2006)In the present work, multi-cation-doped (Sr2+-Mg2+) SiAlON ceramics were investigated. MgO and SrO were used in 100:0 and 50:50 molar ratios. The mixture was sintered at 1800 degrees and 1830 degrees C for 1 h in a gas ... -
Synthesis and sintering of cordierite at low temperature from kaolin and magnesium hydroxide
Kurama, Semra; Özel, E; Ay, Nuran (Trans Tech Publications LTD, 2004)Thermal reactions of ultrafine Mg(OH)(2) mixtures of ultrafine particles and kaolin mixtures were investigated to obtain cordierite at low temperatures. Magnesium hydroxide was precipitated from magnesium chloride (MgCl2) ... -
Thermal stability of yittrium-and-neodymium-doped alpha/beta-SiAlON ceramics
Kurama, Semra; Herrmann, M (Belgian Ceramic Society, 2004)A series of samples of yttrium and neodymium containing alpha-SiAlON (Rx+vSi12-(m+n)Alm+nOnN16-n with R = Y, Nd) has been synthesised at different temperatures and isothermal sintering times. The Rietveld technique was ... -
Ultrasonic characterization of defective porcelain tiles
Eren, Elif; Kurama, Semra; Janssen, R. (Soc Espanola Ceramica Vidrio, 2012)The aim of this work is the optimization of ultrasonic methods in the non-destructive testing of sintered porcelain tiles containing defects. For this reason, a silicon nitride ball, carbon black and PMMA (Polymethylmethacrylate) ... -
Using de-watering sieve waste of borax to enhance the properties of floor tile
Kurama, Semra; Kara, Alpagut; Kurama, H. (Minerals, Metals & Materials Soc, 2006)Incorporation of de-watering sieve waste of borax (TSW) from Etibor Kirka Borax Company (Turkey) on the mechanical and physical properties of a commercial floor tile composition was investigated. In order to achieve this ... -
Utilization of coal combustion fly ash in terracotta bodies
Kara, Alpagut; Kurama, H; Kara, Y; Kurama, Semra (Trans Tech Publications LTD, 2004)In this present work, coal combustion fly ash from a power plant in Turkey was used in combination with a traditional raw material in terracotta production with the aim of having a product with improved physico-mechanical ...