Güncel Gönderiler: Seramik Mühendisliği
Toplam kayıt 272, listelenen: 21-40
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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 ... -
a-SiAION ceramics densified with mixed oxide sintering additives
(2000)Densification and stabilization of ?-sialon ceramics were investigated by using oxides of large cations (Sr2+, La3+, Ce3+, Nd3+) and their equi-molar mixtures with CaO or Yb2O3. All multi-cation and single cation (only ... -
The design of compositions for multi-cation doped ?-ß SiAlON ceramics by the Rietveld method
(2003)Although densification of ?-ß-SiAlON ceramics is easier by using sintering additives, it is difficult to achieve the designed composition and therefore the mechanical properties after sintering. This is mainly due to the ... -
Improvement of elongated ?-SiAlON ceramics by variation of the processing conditions and amounts of additives
(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 ... -
Performance of new ?-ß SiAlONs in turning operations
(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 ... -
The effect of different nucleation temperatures on the grain morphology of ?-SiAlON ceramics
(2003)Nitrogen rich yttrium-cerium containing multi-cation ?-SiAlON starting compositions were prepared by gas pressure sintering using conventional ?-Si3N4 powder. Microstructural characterization of the two stage sintered ... -
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 ... -
Preparation of Ce and Nd beta-sialon ceramics by alpha ->beta sialon transformation
(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 ... -
alpha ->beta sialon transformation in calcium-containing alpha-SiAlON ceramics
(Elsevier Sci LTD, 1999)Recent studies on rare earth densified a-sialon ceramics have shown that the resulting alpha-sialon product, present either as a single phase or in conjunction with beta-sialon, is unstable when heat treated at lower ... -
New heat treatment methods for glass removal from silicon nitride and sialon ceramics
(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 ... -
Transmission electron microscopy of interfaces in structural ceramic composites
(Blackwell Science LTD, 1999)Ceramic composites based either on a particulate, fibre or a lamellar architecture are potentially useful as damage-tolerant high-temperature engineering materials. The ability of the interfaces in such systems to deflect ... -
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 ... -
Boron nitride-silicon carbide interphase boundaries in silicon nitride-silicon carbide particulate composites
(Elsevier Sci LTD, 2002)Interphase boundaries between SiC and h-BN grains in hot isostatically pressed Si3N4-SiC particulate composites made from both as-received powders and deoxidised powders, in which sub-micron size h-BN particles occur as a ... -
The dependence of equilibrium film thickness on grain orientation at interphase boundaries in ceramic-ceramic composites
(Elsevier Science BV, 2000)High-resolution transmission electron microscope observations of hexagonal boron nitride - 3C silicon carbide interphase boundaries suggest that where one or more phases is highly anisotropic, an orientation dependence on ... -
Use of perlite in wall tile production
(Amer Ceramic Soc, 1999)Raw perlite was added to monoporous tile bodies in different proportions. Their mechanical, physical and thermal characteristics were compared to ones having no perlite. Adding perlite to wall tile bodies offers both weight ... -
Phase development of barium titanate from chemically modified-amorphous titanium (hydrous) oxide precursor
(Elsevier Sci LTD, 2002)A synthesis procedure for barium titanate involving a chemically modified titanium precursor has been developed. Using a titanium isopropoxide precursor modified with acetylacetone and barium acetate, coprecipitated gels ... -
Microstructural characterization of surface layers formed on a low alloy steel during erosion - oxidation in a fluidized bed
(Chapman Hall LTD, 1997)Low alloy steel specimens were subjected to erosion-oxidation in a simulated fluidized bed environ ment in the range 100-600 degrees C. Transmission electron microscopy was carried out on the surfaces which experienced ... -
Displacement amplification of electroactive materials using the cymbal flextensional transducer
(Elsevier Science Sa, 2001)High performance electroactive materials were studied as the driver element for the "cymbal" flextensional transducer. The compositions included were commercially available Navy Type I and PKT552 lead zirconate titanate ... -
Piezoelectric hollow spheres for microprobe hydrophones
(Taylor & Francis LTD, 1999)Miniature hollow spheres of lead zirconate titanate have been prepared with a coaxial nozzle process using fine grain slurry of PZT-5. Following the binder burnout and sintering, the spheres were poled radially and ... -
Nanocomposite PLZT ceramic materials in comparison with other processing technique for photostrictive application
(Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2001)The performance of photostrictive materials can be enhanced by controlling the materials and microstructural characteristics through processing methods, ceramic composition and dopant type/content. In this paper the influence ...