Kurum Yazarı "Mandal, Hasan" Seramik Mühendisliği İçin Listeleme
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Improvement of elongated ?-SiAlON ceramics by variation of the processing conditions and amounts of additives
Kurama, Semra; Herrmann, M.; Mandal, Hasan (2001)Two types of Y-?-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 1825°C ... -
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 ... -
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, ... -
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)… -
New developments in ? -SiAlON ceramics
Mandal, Hasan (1999)Two different ?-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 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 a-SiAION ceramics
Mandal, Hasan; Hofmann, J. Michael (2000)Densification and stabilization of ct-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 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 ... -
Optimization and improvement of sialon ceramics with new heat treatment techniques
Mandal, Hasan; Thompson, D. P. (1997)Sialons are of interest for use as engineering materials for high temperature (>1000°C) applications becuase they retain good mechanical properties at these temperatures, whereas competing metallic materials are weak and ... -
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 ... -
Performance of new alpha-beta SiAlONs in turning operations
Mandal, Hasan; Kara, Ferhat; Turan, Servet; Kara, Alpagut (Trans Tech Publications LTD, 2002)New alpha-beta 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 ... -
The preparation of Ce alpha-sialons and related unstable phases
Thompson, DP; Mandal, Hasan (Iom Communications LTD, 1998)It has previously been accepted that lanthanum and cerium do not form alpha-sialon structures because their ions are too large to enter the interstices in the structure. Recent work on heat-treatment of rare-earth densified ... -
Preparation of Ce and Nd beta-sialon ceramics by alpha ->beta sialon transformation
Thompson, DP; Mandal, Hasan (Inst Materials, 1997)It has previously been accepted that lanthanum and cerium do not form alpha-sialon structures because their ions are too large to enter the interstices in the structure. Recent work on heat treatment of rare earth densified ... -
Preparation of multiple-cation ?-SiAlON ceramics containing lanthanum
Mandal, Hasan; Hofmann, J. Michael (1999)Until recently, it was accepted that Ce 3+ cations, with an ionic radius (r) of 1.03 Å, were too large to form an ?-SiAlON structure. However, more-recent studies have shown that cerium cations can be incorporated into ... -
Preparation of multiple-cation alpha-SiAlON ceramics containing lanthanum
Mandal, Hasan; Hofmann, J. Michael (Amer Ceramic Soc, 1999)Until recently, it was accepted that Ce3+ cations, with an ionic radius (r) of 1.03 Angstrom, were too large to form an alpha-SiAlON structure. However, more-recent studies have shown that cerium cations can be incorporated ... -
Thermal stability of rare earth densified ?-sialon ceramics
Mandal, Hasan; Thompson, D. P. (1997)Typical ?-sialon and mixed ?-ß sialon starting compositions were densified by either hot pressing or pressureless sintering using the oxides of Yb, Dy, Sm and Nd. The resulting materials were heat-treated at 1450°C for up ... -
Transmission electron microscopy of SrO containing multi-cation doped ?-SiAlON ceramics
Turan, Servet; Mandal, Hasan; Kara, Ferhat (2002)An advantage of ?-SiAlON is that it can accommodate cations of sintering additives and hence reduces the amount of deleterious remnant intergranular amorphous phase. However, it is believed that relatively large cations ... -
Transmission electron microscopy of SrO containing multi-cation doped alpha-SiAlON ceramics
Turan, Servet; Mandal, Hasan; Kara, Ferhat (Trans Tech Publications LTD, 2002)An advantage of alpha-SiAlON is that it can accommodate cations of sintering additives and hence reduces the amount of deleterious remnant intergranular amorphous phase. However, it is believed that relatively large cations ...