Güncel Gönderiler: Fakülteler
Toplam kayıt 10075, listelenen: 1021-1040
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Optimization of alpha-sialon microstructure by heat treatment
(Trans Tech Publications LTD, 2008)Nd-doped alpha-SiAlON starting composition (Nd(0.33)Si(9.38)Al(2.62)O(1.62)N(14.38)) was prepared by gas pressure sintering at 1825 degrees C for 3 hrs. In order to explore the effect of post heat treatment on the developments ... -
Anisotropic sintering shrinkage in alumina ceramics containing oriented platelets
(Wiley, 2006)The effect of oriented alpha-Al2O3 platelets on densification and shrinkage behavior of tape-cast alpha-Al2O3 during solid-state sintering was studied using dilatometric sintering shrinkage experiments and microstructural ... -
Experimental and finite element study of the thermal conductivity of alpha-SiAlON ceramics
(Blackwell Publishing, 2007)The thermal conductivity of monolithic Y-Sm/alpha-SiAlON was evaluated using experimental data and finite element analysis. The thermal diffusivities of Y, Y-Dy, and Y-Ce/alpha-SiAlON ceramics were also investigated ... -
Fabrication of functionally graded SiAlON ceramics by tape casting
(Blackwell Publishing, 2006)Functionally graded SiAlON ceramics (FG-SiAlONs) were successfully prepared by the tape casting and lamination approach. Non-aqueous SiAlON slurries with five different alpha to beta-SiAlON ratios (85 alpha:15 beta, 70 ... -
Preparation of nanosized tin oxide (SnO2) powder by homogeneous precipitation
(Elsevier Sci LTD, 2007)Synthesis of nanosized SnO2 ceramic particles via homogeneous precipitation was investigated as a function of processing parameters such as initial concentration and calcination temperature. Hydrous tin oxide was precipitated ... -
Synthesis of nanosized tin oxide (SnO2) particles via homogeneous precipitation
(Trans Tech Publications LTD, 2004)Synthesis of nanosized SnO2 ceramic particles via homogeneous precipitation was investigated as a function of processing parameters such as initial concentration and calcination temperature. Hydrous tin oxide was precipitated ... -
Effect of different nucleation temperatures on the microstructural development of alpha-SiAlON ceramics
(Trans Tech Publications LTD, 2004)alpha-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 ... -
Effect of the particle size distribution of spinel on the mechanical properties and thermal shock performance of MgO-spinel composites
(Elsevier Sci LTD, 2003)The influence of varying the amounts of spinel with a similar median particle size, but with different distribution, on the mechanical properties and thermal shock performance of MgO-spinel composites was investigated. ... -
Young's modulus measurements of magnesia-spinel composites using load-deflection curves, sonic modulus, strain gauges and Rayleigh waves
(Elsevier Sci LTD, 2003)The extent of interlinking of the microcracking and a decrease in strength and modulus values were determined to be a function of both spinel particle size and volume fraction to allow calculation of thermal shock parameter, ... -
Fracture behaviour of magnesia and magnesia-spinel composites before and after thermal shock
(Elsevier Sci LTD, 2004)Microstructural changes, as a consequence of the thermal expansion mismatch between magnesia and spinel phases, and fracture behaviour of magnesia and spinel composites have been investigated as a function of spinel content ... -
The influence of zircon in a model aluminosilicate glass tank forehearth refractory
(Elsevier Sci LTD, 2003)Standard aluminosilicate forehearth refractories are normally fabricated with a small proportion of zircon to improve their performance. To identify possible bases for the action of the zircon, fine-grain aluminosilicate ... -
The corrosion resistance of alumina-mullite-zircon refractories in molten glass
(Trans Tech Publications LTD, 2004)Corrosion measurements on a set of alumina-mullite-zircon refractories have been carried out using a static crucible test consisting of a "hole in a block". Rates of corrosion of the refractory at 1370 degreesC for 72 h ... -
Textured ZnO-Based varistors via templated grain growth
(Trans Tech Publications LTD, 2004)Textured ZnO-based varistors were produced by using templated grain growth technique (TGG). Rod-like ZnO particles which used as templates in TGG were synthesized by homogeneous precipitation method from the 0.01 M zinc ... -
Investigation of parameters affecting grain growth of sintered magnesite refractories
(Elsevier Sci LTD, 2005)The parameters influencing grain size of sintered magnesite such as temperature (1700 and 1800degreesC), time (19 and 50 min), cooling rate (5, 10 and 25degreesC min(-1)) and various particle size (-3; +3,-5; +5,-8; +8,-10 ... -
Thermal shock behaviour of magnesia-spinel composites
(Elsevier Sci LTD, 2004)The incorporation of up to 30% of spinel powder of median particle sizes 3, 11 and 22 mum into dense magnesia gives improved resistance to thermal shock as indicated both by the R''' thermal shock resistance parameters ... -
Functionally graded SiAlON ceramics
(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 ... -
The influence of fine alumina particles on the mechanical properties and thermal shock behaviour of slip-cast alumina-mullite refractories
(Trans Tech Publications LTD, 2004)The object of this work is to improve understanding of relationships between microstructure and those mechanical properties likely to affect thermal shock behaviour of slip-cast alumina-mullite refractories. The incorporation ... -
Sr2+-Mg2+-doped SiAlON ceramics
(Blackwell Publishing, 2006)In the present work, multi-cation-doped (Sr2+-Mg2+) SiAlON ceramics were investigated. MgO and SrO were used in 100:0 and 50:50 molar ratios. The mixture was sintered at 1800 degrees and 1830 degrees C for 1 h in a gas ... -
Thermal stability of yittrium-and-neodymium-doped alpha/beta-SiAlON ceramics
(Belgian Ceramic Society, 2004)A series of samples of yttrium and neodymium containing alpha-SiAlON (Rx+vSi12-(m+n)Alm+nOnN16-n with R = Y, Nd) has been synthesised at different temperatures and isothermal sintering times. The Rietveld technique was ... -
Mg+2 and Ce+3 doped alpha-SiAlON ceramics
(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 ...
