Yazar "Kara, Alpagut" için Bildiri Koleksiyonu listeleme
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alpha/beta SiAlON BASED COMPOSITES INCORPORATED WITH MoSi2 FOR ELECTRICAL APPLICATIONS
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Amer Ceramic Soc, 2010)Electrically conductive alpha-beta SiAlON composites containing 30 vol. % MoSi2 was prepared by gas pressure sintering (GPS). The effect of sintering atmosphere on phase formation, grain growth, mechanical and electrical ... -
Characterisation of dorylaion (Turkey) pottery sherds from Hittite period
Kara, Alpagut; Darga, M; Ay, Nuran; Ayaş, E; Sivas, Taciser; Sivas, Hülya (Trans Tech Publications LTD, 2004)In this study, representative samples were taken from eleven pottery sherds of Hittite period recovered during the archaeological excavations of different years in the ancient city Dorylaion, which is nowadays called as ... -
Development of laminar type functionally graded SiAlON ceramics
Çalış, N; Kara, Alpagut; Kara, Ferhat; Mandal, Hasan (Trans Tech Publications LTD, 2004)In order to combine high hardness with high toughness, laminar type (two layers) functionally graded (FGM) SiAlON ceramics were developed. In a previous study achieved by the same authors, presence of a sharp transition ... -
Development strategies for sialon ceramics
SiAlON ceramics have a wide range of applications due to their favorable mechanical and thermal properties. They are one of the main groups of materials being considered for high temperature load bearing applications and ... -
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 ... -
Effects of Alumina and White Fused Alumina Addition on Transparent Wall and Floor Tile Glazes
Yıldız, B.; Öztürk, Z. B.; Kara, Alpagut (Polish Acad Sciences Inst Physics, 2015)In tile manufacturing, alpha-Al2O3 is the main type of alumina used in ceramic body and glaze formulations. This raw material acts as an pacifier in porcelain tile bodies and as a matting agent in glazes. White fused alumina ... -
Influence of type of cations on intergranular phase crystallisation of SiAlON ceramics
Açıkbaş, N. Çalış; Kara, Alpagut; Turan, Servet; Kara, Ferhat; Mandal, Hasan; Bitterlich, B. (Trans Tech Publications LTD, 2007)25 alpha:75 beta SiAION composition was designed with different cations and at different molar ratios. Effect of the type of cations both on the composition and the type of intergranular phase investigated after gas pressure ... -
Interactions between a bismuth type leadless glaze and a bone China body during glost firing
Kara, Alpagut; Stevens, R (Trans Tech Publications LTD, 2004)In the present study, the interactions between a high bismuth type commercial transparent leadless glaze and a biscuit fired bone china body during glost firing at different temperatures were investigated using SEM. The ... -
An investigation into bloating behaviour of bone China body during biscuit firing
Kara, Alpagut (Trans Tech Publications LTD, 2004)Amongst many studies on the textural, mineralogical and physical changes during biscuit firing of whiteware bodies, this paper attempts to investigate the bloating behaviour of a commercial bone china body during biscuit ... -
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 sanitaryware scrap behaviour in terracotta bodies
Kara, Alpagut; Işık, I; Uz, V; Sayarer, G (Trans Tech Publications LTD, 2004)In this paper, an investigation into a potential use of unfired body scrap from a local sanitaryware manufacturer in commercial terracotta production was presented. Experiments were achieved under laboratory conditions by ... -
Joining of SiAlON ceramics to pyrex glass
Kalemtaş, Ayşe; Kara, Alpagut; Kara, Ferhat; Mandal, Hasan; Aktug, B (Belgian Ceramic Society, 2004)In the present study, pressureless joining of gas pressure sintered (alpha-beta)-SiAlON ceramics to pyrex glass was investigated. Preoxidized SiAlON ceramics were used to enhance wettability and provide chemical compatibility ... -
A Novel Approach For Preparing Electrically Conductive SiAlON-TiN Composites by Spark Plasma Sintering
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Trans Tech Publications LTD, 2009)An effective approach for preparing electrically conductive SiAlON-TiN composites was developed. Granules of a designed composition of alpha-beta SiAlON was obtained by spray drying and coated with varying amounts of TiO(2) ... -
Pressing behaviour of spray dried alumina-zirconia granules
Kara, Ferhat; Kara, Alpagut; Turan, Servet; Mandal, Hasan (Trans Tech Publications LTD, 2004)In this study, spray drying of alumina-zirconia slurries on a pilot scale, and their pressing behaviour were investigated. Slurries were prepared at 50 wt-% solid loading. An acrylic polymer emulsion, polyethylene glycol, ... -
Pressureless sintering of Al2O3-TiCN composites
Ayas, Erhan; Kara, Alpagut (Trans Tech Publications LTD, 2004)A composition of 70 wt % Al2O3 + 30 wt % TiCN was prepared and pressureless-sintered at temperatures ranging from 1700 to 1840degreesC. In order to achieve densification, a powder bed was also employed. The resultant ... -
Production of alpha-beta SiAlON-TiN/TiCN composites by gas pressure sintering
Ayas, Erhan; Kara, Alpagut; Mandal, Hasan; Turan, Servet; Kara, Ferhat (Belgian Ceramic Society, 2004)Due to the favorable properties possessed by novel alpha-beta SiAlONs, they are attractive materials for cutting tool applications. Such applications require materials with high hardness, high fracture toughness and high ... -
Re-use of muds from glazing and pressing lines of ceramic tile industry in wall and floor type formulations
Kara, Alpagut; Kayacı, Burcu; Kayacı, Kaan (Minerals, Metals & Materials Soc, 2006)Turkey is the fifth biggest ceramic tile exporter in the world. Considering the expectation that the Turkish tile sector continues to expand, further studies both on the improvement and the development of tile formulations ... -
Spark plasma sintering of Si3N4-B4C composites
Ayas, Erhan; Kalemtaş, Ayşe.; Arslan, Gökhan; Kara, Alpagut; Kara, Ferhat (Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2008)In this study the production Of Si3N4-B4C Composites using spark plasma sintering technique was studied. This technique was preferred in order to minimize the reactions between starting constituents. Fully dense Si3N4 ... -
Spark Plasma Sintering of Silicon Nitride-Boron Carbide Composites
Ayas, Erhan; Kalemtaş, Ayşe.; Arslan, Gökhan; Kara, Alpagut; Kara, Ferhat (Trans Tech Publications LTD, 2009)Si(3)N(4)-B(4)C composites containing fine and coarse B(4)C particles were produced using Al(2)O(3) and Y(2)O(3) as sintering additives via spark plasma sintering (SPS) technique. Phase assemblages of the produced composites ... -
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 ...