Kurum Yazarı "Kara, Ferhat" Scopus İndeksli Yayınlar Koleksiyonu İçin Listeleme
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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 ... -
Mechanical properties of melt infiltrated boron carbide-aluminium composites
Arslan, Gökhan; Kara, Ferhat; Turan, Servet (Trans Tech Publications LTD, 2002)Boron carbide (B4C)-aluminium (Al) composites were produced by melt infiltration of 2024-T3 series Al alloys into porous B4C compacts in the temperature range of 985 degrees -1370 degreesC under an inert atmosphere (Ar). ... -
Microstructural characterization of reactively sintered mullites
Kara, Ferhat; Turan, Servet; Little, JA; Knowles, KM (Amer Ceramic Soc, 2000)Mullite ceramics have been produced by reaction sintering of powders prepared using pseudoboehmite-colloidal silica and aluminum sulfate-colloidal silica mixtures. The microstructural development of these mullites was ... -
Microstructural characterization of surface layers formed on a low alloy steel during erosion - oxidation in a fluidized bed
Rogers, PM; Hutchings, IM; Little, JA; Kara, Ferhat (Chapman Hall LTD, 1997)Low alloy steel specimens were subjected to erosion-oxidation in a simulated fluidized bed environ ment in the range 100-600 degrees C. Transmission electron microscopy was carried out on the surfaces which experienced ... -
Microstructure-Mechanical Properties-Wear Resistance Relationship of SiAlON Ceramics
Kumar, Ravi; Acikbas, N. Çalış; Kara, Ferhat; Mandal, Hasan; Basu, Bikramjit (Springer, 2009)In designing wear-resistant ceramics, it is important to understand the influence of the microstructure and material properties on friction and wear behavior. In addressing such issues, a series of fretting-wear tests was ... -
Microstructure-permeability relation of porous beta-Si3N4 ceramics
Topateş, Gülsüm; Mammitzsch, Lars; Petasch, Uwe; Adler, Joerg; Kara, Ferhat; Mandal, Hasan (Elsevier Sci LTD, 2013)Porous beta-Si3N4 ceramics with two distinct structures were produced by using two different Si3N4 sources to investigate the relationship between microstructure and permeability. Results showed that regardless of pore ... -
A novel approach for preparing electrically conductive alpha/beta SiAlON-TiN composites by spark plasma sintering
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2008)An effective approach for preparing electrically conductive SiAlON-TiN composites have been developed. Granules of a designed composition of alpha-beta SiAlON were obtained by spray drying and coated with varying amounts ... -
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) ... -
Novel SiAlON ceramics for cutting tool applications
Mandal, Hasan; Kara, Ferhat; Turan, Servet; Kara, Alpagut (Trans Tech Publications LTD, 2003)New alpha-beta SiAlON ceramics were produced in aqueous medium by Using Multiple oxides as densifying additives. The sintered materials were characterised using a combinations of techniques such as XRD, SEM and TEM. The ... -
Optimization of the Corrosion Behavior of Mullite Refractories Against Alkali Vapor Via Zrsio4 Addition to the Binder Phase
Başpınar, M. Serhat; Kara, Ferhat (University Chemistry & Technology, Prague, 2009)Effect of ZrSiO4 addition to the binder matrix of the reaction sintered mullite refractories on the alkali corrosion (Na2CO3, at 1370 degrees C) behaviour was investigated. Important improvements on the corrosion behaviour ... -
Performance of new ?-ß SiAlONs in turning operations
Mandal, Hasan; Kara, Ferhat; Turan, Servet; Kara, Alpagut (2001)New ?-ß SiAlON ceramics were produced, characterised and tested in turning operations of cast iron. Cutting speeds varied between 400-1200 m/min while feeding rates were between 0.3 to 0.5 mm/rev. The results were compared ... -
Phase studies of reactive infiltrated boron carbide-aluminium composites by quantitative XRD
Arslan, Gökhan; Kara, Ferhat; Turan, Servet (Trans Tech Publications LTD, 2002)Fully dense (> 98 % of theoretical) boron carbide (B4C)-aluminium (Al) composites were produced between 985 degrees and 1370 degreesC by pressureless melt infiltration of Al alloys into porous B4C compacts under an argon ... -
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 melt infiltrated non-oxide ceramic-metal composites
Kalemtaş, Ayşe; Arslan, Gökhan; Kara, Ferhat (2009)In the present study highly dense (open porosity > 1 %), light-weight (d ? 2.85 g/cm3) and Al4C3-free non-oxide ceramic-metal composites were produced at comparatively low temperatures (? 1250°C) by pressurless melt ... -
Processing of in-situ SiC reinforced AlN based composites
Kalemtaş, Ayşe; Arslan, Gürsoy; Kaya, Pınar; Turan, Servet; Kara, Ferhat (Korean Assoc Crystal Growth, Inc, 2018)In this study, highly dense (>97%) in-situ SiC reinforced AlN based ceramic-metal composites were produced by pressureless reactive infiltration of 7075 aluminium alloys into porous alpha-Si3N4, alpha-Si3N4 + 4 wt. % carbon ... -
Processing, phase evaluation and mechanical properties of MoSi2 doped 4TaC-HfC based UHTCs consolidated by spark plasma sintering
Arianpour, Farzin; Golestanifard, Farhad; Rezaie, Hamidreza; Mazaheri, Mehdi; Çelik, Ali; Kara, Ferhat; Fantozzi, Gilbert (Elsevier Sci LTD, 2016)In this research, binary 4TaC-HfC based composites were consolidated using carbide materials and addition of 0-15 vol.% MoSi2 by means of spark plasma sintering at 2000 degrees C. The nearly full dense and monophase specimens ... -
Production and permeability of porous Si 3 N 4 ceramics produced by starch addition
Topateş, Gülsüm; Petasch, U.; Adler, Joerg; Kara, Ferhat; Mandal, Hasan (Taylor and Francis Ltd., 2013)•We produce highly porous (up to 66%) Si 3 N 4 .•We enhance the permeability of Si 3 N 4 by using starch as pore former.•Increasing starch amount (?20vol.%) created large and bimodal pore channels and permeability values ... -
Quantitative X-ray diffraction analysis of reactive infiltrated boron carbide-aluminium composites
Arslan, Gökhan; Kara, Ferhat; Turan, Servet (Elsevier Sci LTD, 2003)Dense (> 98% of theoretical) boron carbide, (B4C)-aluminium (Al) composites were produced between 985 and 1370 degreesC by pressureless melt infiltration of Al alloys into porous B4C compacts under. argon (Ar) atmosphere. ...