Güncel Gönderiler: Fakülteler
Toplam kayıt 10075, listelenen: 961-980
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Sintering behaviour of precursor mullite powders and resultant microstructures
(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 ... -
Reaction-bonded aluminium oxide (RBAO) process: II, the solid-state oxidation of RBAO compacts
(2000)The oxidation kinetics and the fraction of aluminum that is oxidized via solid-gas reaction in reaction-bonded aluminum oxide (RBAO) compacts are shown to be strongly dependent on the oxidation temperature and the ... -
Mechanical properties of magnesia-spinel composites
(2002)A set of dense magnesia-magnesium aluminate spinel composites has been prepared by hot-pressing magnesia powder using 0 to 30 wt.% of spinel powder of mean particle size 3, 11 and 22 µm. Bend stength, modulus, and fracture ... -
The Microstructural Studies in Limonite Containing Satin and Opaque Wall Tile Glazes
(2003)There have been a number of studies to investigate possible use of limonite and limonite-based pigments in different ceramic glaze systems. In these researches it was reported that Eskisehir Mihaliccik region's limonite ... -
Preparation of cordierite ceramics from talc with boron oxide addition
(2004)Thermal reactions of impure materials of talc, silica and alumina with moderate particle sizes were investigated to obtain a dense cordierite ceramic by boron oxide addition as a sintering aid. Mixed powders were uniaxially ... -
Synthesis of the CeO2 based pigments by using enriched rare-earth oxides located at eskişehir kizilcaören region
(2004)Pigments based on CeO2 structure are known to give various pink-orange and red brown colour in ceramic glazes. This type of pigments is prepared by high temperature calcination of CeO2 and Pr 6O11 with admixed rare-earth ... -
The characterization and the utilization of the waste clays from gümüşköy silver mine in brick industry
(2004)In this study, the main characteristics and technological properties of the waste clays from silver deposit located in the northern part of Kutahya (mid-south of Turkey) are presented. The clays were characterized by X-ray ... -
Mg+2 and Ce+3 doped ?-SiAlON ceramics
(2004)In the present work, stabilization of MgO and CeO2 in ?-SiAlON structure is studied. Mg and CeO2 were used in 50:50 molar ratios as additives. The mixture was sintered at 1830°C for 1 hour in gas pressure sintering furnace ... -
Effect of different nucleation temperatures on the microstructural development of ?-SiAlON ceramics
(2004)?-SiAlON ceramics with elongated grains were previously observed in different studies. Sintering conditions are known to have a significant role on the microstructural development. By the nucleation treatment application ... -
Microstructural evolution R-?-SiAlON ceramics (R=Y, Y+Sm and Sm)
(2004)Yttrium or samarium doped ?-SiAlON composition was sintered using gas pressure sintering through two different sintering procedures. One group of samples was heated up to 1800°C and then held for 1h while another group of ... -
Formation of ?-SiAlON ceramics containing scandium
(2004)?-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 an ... -
Composite transducer arrays for the treatment of diabetes
(Wiley, 2005)A portable transdermal drug delivery system using a composite transducer array has been designed to promote insulin transmission through the skin using ultrasound. Previous investigators used large, heavy sonicators in ... -
Structural characterisation of Er-Si-Al-O-N glasses by Raman spectroscopy
(Elsevier Sci LTD, 2007)Er-Si-Al-O-N glasses have been prepared with cation ratio Er:Si:AI=3.45:3:2 containing various amounts of nitrogen (N=O, 5, 8, 15 and 22equiv.%). Glass properties such as microhardness, glass transition temperature and ... -
Effects of red mud based pigments on wall and floor tile glazes
(2005)In the present study, high iron oxide containing red mud appeared and disposed during the metallic aluminium production of Seydisehir aluminium factory of Turkey was combined with several colouring oxides for the purpose ... -
Deaging of heat-treated iron-doped lead zirconate titanate ceramics
(Amer Inst Physics, 2006)Doping strongly influences the properties of ferroelectric perovskite materials. One striking difference between donor- and acceptor-doped materials is the transition from "soft" to "hard" ferroelectric behavior. The ... -
Chemical durability behaviour of bulk glasses in the Er-SiAlON system: Surface characterisation by SEM
(Trans Tech Publications LTD, 2004)Er-SiAlON glasses were produced by melting appropriate powder mixtures under nitrogen at 1715 degreesC using a cation ratio composition of Er:Si:Al = 3.45:3:2 and with varying nitrogen contents (N= 5 to 22 equivalent %). ... -
Pressure limitations of miniature hollow sphere hydrophones
(Taylor & Francis LTD, 2005)Ultrasonic probes that can withstand high pressures and temperatures are needed for deep oil wells, underwater sonar systems, the processing of chemicals, and as automotive actuators. Pressure limits of hollow spherical ... -
Pressure dependence of cymbal transducers
(IEEE-Inst Electrical Electronics Engineers Inc, 2007)The hydrostatic pressure limit that a receiver can withstand without failure is of major importance in underwater sonar systems. In this paper, the hydrostatic pressure tolerance and sensitivity of cymbal receivers were ... -
Possible use of trachyte as a flux in floor tile production
(Techna Srl, 2006)The possible use of trachyte as an alternative fluxing agent in a commercial floor tile body was investigated. The experiments were carried out two parts: In the first part, standard tests were applied to the products ... -
Image analysis of sulfate attack on hardened cement paste
(Elsevier Sci LTD, 2008)This paper presents an investigation conducted on the sodium sulfate resistance of Portland cements with various C(3)A contents, and on two blended cements produced by replacing 40% Of low C3A cement with fly ashes having ...
