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Toplam kayıt 71, listelenen: 24-43
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The effect of heat-treatment on the performance of sub-micron SiCp-reinforced alpha-beta sialon composites .2. Heat-treatment studies
(Elsevier Sci LTD, 1997)The effects of heat-treatment on alpha --> beta sialon transformation in dense, agglomerate-free Ln-sialon/SiCp(Ln=Nd,Yb) composites are reported. The stability of the alpha-sialon phase is not only dependent on the ... -
The effect of heat-treatment on the performance of sub-micron SiCp-reinforced alpha-beta sialon composites .3. Mechanical properties
(Elsevier Sci LTD, 1997)Agglomerate-free SiCp-reinforced Ln-sialon (Ln=Nd and Yb) composites were fabricated by hot-pressing and by pressureless sintering to evaluate the improvement in microstructure and mechanical properties that could be ... -
The effect of heat-treatment on the performance of submicron SiCp-reinforced ?-ß sialon composites: III. Mechanical properties
(Elsevier BV, 1997)Agglomerate-free SiCp-reinforced Ln-sialon (Ln=Nd and Yb) composites were fabricated by hot-pressing and by pressureless sintering to evaluate the improvement in microstructure and mechanical properties that could be ... -
The effect of processing conditions, amount of additives and composition on the microstructures and mechanical properties of alpha-SiAlON ceramics
(Elsevier Sci LTD, 2002)A series of samples with yttrium alpha -SiAlON compositions and different amounts of additive has been fabricated from alpha -Si3N4, AIN, Al2O3 and Y2O3 starting powders, using gas pressure sintering and three different ... -
Effect of starting composition, type of rare earth sintering additive and amount of liquid phase on ? ? ß sialon transformation
(1997)Five different ?-ß sialon and ?-sialon compositions have been prepared using different rare earth oxide additives namely, neodymium, samarium, dysprosium and ytterbium. Post-sintering heat treatments have been carried out ... -
Effect of starting composition, type of rare earth sintering additive and amount of liquid phase on alpha reversible arrow beta sialon transformation
(Elsevier Sci LTD, 1997)Five different alpha-beta sialon and alpha-sialon compositions have been prepared using different rare earth oxide additives namely, neodymium, samarium, dysprosium and ytterbium., Post-sintering heat treatments have been ... -
Effect of starting Si3N4 powder type and sintering conditions on grain morphology of alpha-SiAlON ceramics
(Maney Publishing, 2002)Nitrogen rich multication alpha-SiAlON ceramics doped with Y-Ce have been densified by gas pressure sintering using alpha-Si3N4 or mixed beta/alpha-Si3N4 starting powder. The effects of alpha-SiAlON nucleation and growth ... -
Effects of cobalt, copper, manganese and titanium oxide additions on the microstructures of zinc containing soft porcelain glazes
(2002)Different types of glazes, which are nearly all based upon silicate compositions, are used to meet a wide range of requirements in service. Many artistic effects are achieved by departing from a clear, smooth, transparent ... -
Formation mechanisms and morphological changes during the hydrothermal synthesis of BaTiO3 particles from a chemically modified, amorphous titanium (hydrous) oxide precursor
(Elsevier Sci LTD, 2003)The formation mechanism of BaTiO3 under hydrothermal conditions was investigated. A coprecipitated precursor prepared from chemically modified titanium isopropoxide with acetylacetone and barium acetate was used as a ... -
Frequency-tunable microwave dielectric resonator
(IEEE-Inst Electrical Electronics Engineers Inc, 2001)A new type of tunable composite dielectric resonator (DR) has been designed. In the structure of this DR, a controllable insert was used to change the resonance frequency (f(0)) in a wide spectral range, while preserving ... -
Hard and tough ?-SiAION ceramics
(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" ?-Si3N4 powder. X-ray diffraction studies of both ... -
High resolution transmission electron microscopy of grain boundaries between hexagonal boron nitride grains in Si3N4-SiC particulate composites
(Wiley-V C H Verlag GMBH, 2000)High resolution transmission electron microscope observations of grain boundaries in hexagonal boron nitride in which adjacent grains are rotated with respect to one another about either <2 (1) over bar (1) over bar 0> or ... -
Hydrated aluminium sulfate precipitation by enzyme-catalysed urea decomposition
(Elsevier Sci LTD, 2000)Hydrated basic aluminium hydroxide precipitates were obtained from aluminium sulphate solution at room temperature and at 92 degrees C by using urea. Enzyme urease was used to decompose urea at room temperature. It was ... -
Improvement of sintering and microstructural homogeneity of a diphasic mullite
(Elsevier Sci LTD, 2001)Effect of seeding of boehmite-colloidal silica mixture with aluminium sulphate-colloidal silica mixture on its mullite formation and sintering behaviours and microstructural development was studied. It was observed that ... -
Influence of sample thickness on the performance of photostrictive ceramics
(Amer Inst Physics, 1998)Ferroelectric materials with high photovoltaic properties are of interest for new optical devices such as photostrictive ceramic actuators. However, fabrication of these devices requires development of materials exhibiting ... -
The influence of silicoferrochromium fume on concrete properties
(1995)Silicoferrochromium fume containing 85.5% SiO 2 was investigated to determine whether it could be used as an admixture in concrete to increase its strength. The fume was added at the dosage rates of 0-5 % by weight of ... -
The influence of zircon on the mechanical properties and thermal shock behaviour of slip-cast alumina-mullite refractories
(Elsevier Science BV, 2002)Mechanical properties of slip-cast alumina-mullite (AM) refractories were improved significantly by the addition of similar to 2-mu-m zircon (ZrSiO4) particles. Fracture behaviour showed mainly transgranular, with some ... -
Interactions between an ABS type leadless glaze and a biscuit fired bone china body during glost firing. Part I: preparation of experimental phases
(Elsevier Sci LTD, 2002)In this paper, part of an extended study, crystalline phases of a biscuit fired bone china body, namely anorthite and beta-tricalcium phosphate (beta-TCP), were produced experimentally to be used in subsequent interface ...