Yazar "Kara, Ferhat" için Makale Koleksiyonu listeleme
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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. ... -
Sintering behaviour of precursor mullite powders and resultant microstructures
Kara, Ferhat; Little, J. A. (Elsevier BV, 1996)Crystallization and sintering behaviour of two structurally different diphasic precursor mullite powders were studied. Powder derived from boehmite and colloidal silica formed mullite at around 1250°C and could be sintered ...