Fakülteler by Institution Author "Kara, Ferhat"
Now showing items 1-20 of 42
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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 ... -
A comparative study of SiAlON ceramics
Mallik, Awadesh Kumar; Acikbas, Nurcan Çalış; Kara, Ferhat; Mandal, Hasan; Basu, Debabrata (Elsevier Sci LTD, 2012)Two different varieties of Si3N4 powders were used to prepare SiAlON ceramics. 100% beta-Si3N4 was used from refractory grade powders (B1) and another purer 98% alpha-Si3N4 (50A) powder was used to prepare the SiAlON ... -
Cytocompatibility property evaluation of gas pressure sintered SiAlON-SiC composites with L929 fibroblast cells and Saos-2 osteoblast-like cells
Kumar, Alok; Mallik, Awadesh Kumar; Açıkbaş, Nurcan Çalış; Yaygingol, Merve; Kara, Ferhat; Mandal, Hasan; Basu, Bikramjit (Elsevier Science BV, 2012)Although the oxide ceramics have widely been investigated for their biocompatibility, non-oxide ceramics, such as SiAlON and SiC are yet to be explored in detail. Lack of understanding of the biocompatibility restricts the ... -
Decolouration effect of WC addition on gas pressure sintered alpha-beta SiAlON ceramics
Ayas, Erhan; Kara, Alpagut; Mandal, Hasan; Turan, Servet; Kara, Ferhat (Elsevier Science BV, 2004)In this study, an attempt was made to mask an inhomogeneous gray colouration featured on the surfaces of the gas pressure sintered alpha-beta SiAlON ceramics containing 50% alpha and 50% beta SiAlONs in the form of spots. ... -
Development of ?-ß SiAlON ceramics from different Si 3N4 starting powders
Açıkbaş, N. Çalış; Kara, Ferhat; Mandal, Hasan (2009)?-ß SiAlON ceramics were produced from different starting Si3N4 powders including P-Si3N4 and ?-Si3N4 powders and mixtures of these powders. Gas pressure sintering was used for sintering. After sintering, resultant fracture ... -
Development of alpha-beta SiAlON ceramics from different Si3N4 starting powders
Açıkbaş, N. Çalış; Kara, Ferhat; Mandal, Hasan (Trans Tech Publications LTD, 2009)alpha-beta SiAlON ceramics were produced from different starting Si3N4 powders including beta-Si3N4 and alpha-Si3N4 powders and mixtures of these powders. Gas pressure sintering was used for sintering. After sintering, ... -
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 ... -
Effect of earth alkaline oxides on firing behaviour of porcelain stoneware
Çiğdemir, G.; Kara, Alpagut; Kara, Ferhat (Techna Srl, 2010)Aim of this study was to investigate the relations between chemical composition and firing behaviour of porcelain stoneware formulations. The effects of magnesia and/or calcia incorporation in varying amounts into a standard ... -
Effect of heat treatment on green machinability of SiAlON compacts
Çelik, Ali; Yaman, Halil; Turan, Servet; Kara, Alpagut; Kara, Ferhat (Elsevier Science Sa, 2014)SiAlON based ceramics are promising materials for wear applications such as wire extrusion dies, pipe bending rollers, etc. due to their outstanding mechanical properties both at high and low temperatures. To be able to ... -
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 effect of z value on intergranular phase crystallization of alpha(1)/beta(1)-SiAlON-TiN composites
Açıkbaş, N. Çalış; Kara, Ferhat (Elsevier Sci LTD, 2017)Relationship between z value and intergranular phase (IGP) chemistry has not been completely developed to date for SiAlON based materials. In this study, the effect of z value of beta(1)-SiAlON on crystallization and ... -
Functionally graded SiAlON ceramics
Çalış, N; Kuşhan, Seniz Reyhan; Kara, Ferhat; Mandal, Hasan (Elsevier Sci LTD, 2004)Functionally graded SiAlON ceramics were developed by three different methods to improve the mechanical properties of SiAlONs; powder bed, rapid cooling and laminating. beta-SiAlON compacts were embedded in two different ... -
Fundamentals for optimization of binding for high refractory mullite products
Başpınar, M. Serhat; Schulle, W; Kara, Ferhat (Trans Tech Publications LTD, 2004)Properties of the binder matrix affect the quality of the refractory. Better qualities are possible if the binding is optimum. Mechanical properties, thermal shock resistance, creep and corrosion behaviour of the mullite ... -
Glass-ceramic glazes in the CaO-SiO2 system
Alptekin, K; Kara, Ferhat (Trans Tech Publications LTD, 2004)Glass ceramic glazes were developed in the system of CaO-SiO2 system. Compositions containing B2O3 and K2O as fluxing agent were melted at 1450degreesC and fritted. Glazes for porcelain tiles were formulated by using these ... -
Influence of beta-Si3N4 particle size and heat treatment on microstructural evolution of alpha:beta-SiAlON ceramics
Açıkbaş, N. Çalış; Kumar, R.; Kara, Ferhat; Mandal, Hasan; Basu, B. (Elsevier Sci LTD, 2011)In the present study, we report the effects of starting beta-Si3N4 particle sizes and post-sintering heat treatment on microstructure evolution and mechanical properties of prepared alpha-beta SiAlON ceramics. Three different ... -
Influence of SiC addition on tribological properties of SiAlON
Mallik, Awadesh Kumar; Reddy, K. Madhav; Açıkbaş, Nurcan Çalış; Kara, Ferhat; Mandal, Hasan; Basu, Debabrata; Basu, Bikramjit (Elsevier Sci LTD, 2011)The tribological properties of gas pressure sintered SiAlON and its composite with 18 wt% silicon carbide (SiC) against two different mating materials, i.e., alumina and SiAlON are evaluated. SiAlON and SiAlON-18%SiC ... -
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 AlN and SiAlON Ceramics
Kalemtaş, Ayşe; Acikbas, N. Çalış; Kara, Ferhat; Mandal, Hasan; Krnel, K.; Kosmac, T. (Trans Tech Publications LTD, 2009)In the present study, interactions between AlN and SiAlON laminated couples were investigated after gas pressure (GPS) and spark plasma sintering (SPS) by scanning electron microscopy (SEM) and energy dispersive x-ray ... -
Investigation on the performance of SiAlON ceramic drills on aerospace grade CFRP composites
Çelik, Ali; Lazoğlu, İsmail; Kara, Alpagut; Kara, Ferhat (Elsevier Science Sa, 2015)Carbon fiber reinforced polymer (CFRP) composites are widely used in aircraft structure due to their outstanding physical and mechanical properties. Drilling is one of the most critical operation in the handling of CFRP ...