Kurum Yazarı "Kurama, Semra" Bildiri Koleksiyonu İçin Listeleme
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Densificaron of Sr-Mg doped SiAlONs with GPS and SPS
Kurama, Semra; Herrmann, M. (2007)At temperature above 1200°C, the thermal stability of ?-SiAlON phases has been debated since 1992; however, it has been discussed if any ?-SiAlON phase can be formed in Ce, La, Eu and Sr-doped SiAlON systems. In our previous ... -
Densification of Sr-Mg doped SiAlONs with GPS and SPS
Kurama, Semra; Herrmann, M. (Trans Tech Publications LTD, 2007)At temperature above 1200 degrees C, the thermal stability of alpha-SiAlON phases has been debated since 1992; however, it has been discussed if any alpha-SiAlON phase can be formed in Ce, La, Eu and Sr-doped SiAlON systems. ... -
The effect of boron waste in phase and microstructural development of a terracotta body during firing
Kurama, Semra; Kara, Alpagut; Kurama, H (Elsevier Sci LTD, 2006)In the present study, a dewatering sieve waste (TSW) of Etibor Kirka Borax company (Turkey) was employed in different amounts in order to develop an experimental terracotta floor tile body composition in combination with ... -
Formation of ?-SiAlON ceramics containing scandium
Kurama, Semra; Mandal, Hasan (2004)?-SiAlON is able to accommodate cations into its crystal structure if the cations are sufficiently small in size, thus helping to reduce the volume of the remnant grain boundary phase after processing. Lutetium with an ... -
Formation of alpha-SiAlON ceramics containing scandium
Kurama, Semra; Mandal, Hasan (Trans Tech Publications LTD, 2004)alpha-SiAlON is able to accommodate cations into its crystal structure if the cations are sufficiently small in size, thus helping to reduce the volume of the remnant grain boundary phase after processing. Lutetium with ... -
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 ... -
Mg+2 and Ce+3 doped ?-SiAlON ceramics
Kurama, Semra; Mandal, Hasan (2004)In the present work, stabilization of MgO and CeO2 in ?-SiAlON structure is studied. Mg and CeO2 were used in 50:50 molar ratios as additives. The mixture was sintered at 1830°C for 1 hour in gas pressure sintering furnace ... -
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-?-SiAlON ceramics (R=Y, Y+Sm and Sm)
Kurama, Semra; Mandal, Hasan (2004)Yttrium or samarium doped ?-SiAlON composition was sintered using gas pressure sintering through two different sintering procedures. One group of samples was heated up to 1800°C and then held for 1h while another group of ... -
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 ?-sialon microstructure by heat treatment
Kurama, Semra (2008)Nd-doped ?-SiAlON starting composition (Nd0.33Si 9.38Al2.62O1.62N14.38) was prepared by gas pressure sintering at 1825°C for 3 hrs. In order to explore the effect of post heat treatment on the developments of elongated ... -
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 ... -
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 ... -
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 ... -
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 ...