Kurum Yazarı "Mandal, Hasan" WoS İndeksli Yayınlar Koleksiyonu İçin Listeleme
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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 ... -
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 ... -
Hard and tough alpha-SiAlON ceramics
Mandal, Hasan; Hofmann, J. Michael (Trans Tech Publications LTD, 2000)Yb, Nd/Ca and Ce/Ca containing a-sialon starting compositions have been densified by either pressureless sintering or capsul free sinter/HIP'ing using "conventional" alpha-Si3N4 powder. X-ray diffraction studies of both ... -
Improvement of elongated alpha-SiAlON ceramics by variation of the processing conditions and amounts of additives
Kurama, Semra; Herrmann, M; Mandal, Hasan (Trans Tech Publications LTD, 2002)Two types of Y-alpha -SiAlON composition, with different amounts of additional liquid phase were densified in a gas pressure sintering furnace using three different sintering cycles. One series of samples was heated up to ... -
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 of the phase composition and stability of the alpha-SiAlONs by the Rietveld method
Herrmann, M; Kurama, S; Mandal, Hasan (Elsevier Sci LTD, 2002)Different compositions of Y- and Nd-alpha-SiAlONs were sintered at 1825 degreesC and analysed by the XRD method. The Rietveld technique was used for characterisation of the diffraction pattern and the x value of alpha-SiAlON, ... -
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 ... -
Luminescence properties of terbium-, cerium-, or europium-doped alpha-sialon materials
van Krevel, JWH; van Rutten, JWT; Mandal, Hasan; Hintzen, HT; Metselaar, R (Academic Press Inc Elsevier Science, 2002)… -
Mechanical characterization of highly porous beta-Si3N4 ceramics fabricated via partial sintering & starch addition
Kalemtaş, Ayşe; TopAteş, Gülsüm; özcoban, Hüseyin; Mandal, Hasan; Kara, Ferhat; Janssen, Rolf (Elsevier Sci LTD, 2013)In this study, porous beta-Si3N4 ceramics containing limited amount of Sm2O3 and CaO as sintering aids were produced by addition of potato starch (10 and 20 vol.%) and partial sintering. Two different Si3N4 powders, alpha- ... -
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-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 ... -
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 ... -
New developments in alpha-SiAlON ceramics
Mandal, Hasan (Elsevier Sci LTD, 1999)Two different alpha-sialon compositions have been densified by either pressureless sintering or capsul-free sinter HIPing using either single cation namely strontium, lanthanum, cerium, neodymium or their equimolar mixtures ... -
New heat treatment methods for glass removal from silicon nitride and sialon ceramics
Mandal, Hasan; Thompson, D. P. (Kluwer Academic Publ, 2000)Sialon ceramics were discovered simultaneously (but independently) in late 1971 at Newcastle University and also at the Toyota Research Laboratories in Japan. During the 30 years since their original discovery, the Newcastle ... -
Novel developments in alpha-SiAlON ceramics
Mandal, Hasan; Hofmann, J. Michael (Trans Tech Publications LTD, 2000)Densification and stabilization of alpha-sialon ceramics have been investigated by using oxides of large cations (Sr2+, La3+, Ce3+, Nd3+) and their equimolar mixtures with calcium or ytterbium as a principal cation. All ... -
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 ...