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  • 1
    Electronic Resource
    Electronic Resource
    Sintering Shrinkage Anisotropy of Spherical Alumina Powder Compacts with Particle Orientation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 293-296 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Spherical alumina powder and dispersant were mixed with distilled and deionized water, and ballmilled to make alumina slurry. The slurry was dried in a high magnetic field to make a compact.Subsequently, the compact was cold-isostatic-pressed (CIP) to enhance the homogeneity in particle packingdensity. Anisotropy of shrinkage during sintering was examined for the alumina compacts in detail. Particleorientation existed in the spherical alumina powder compacts prepared in 10T, and made them shrinkanisotropically during sintering. Sintering shrinkage was larger in the direction parallel to magnetic fielddirection (i.e., the c-axis direction of alumina crystal) than that in its perpendicular direction. The particleorientation structure in the compacts was confirmed with the immersion liquid method of polarized lightmicroscope, and the grain alignment structure in the sintered bodies was also observed with X-ray diffraction,the c-plane was perpendicular to the magnetic field direction. On the other hand, isotropic sintering shrinkageoccurred in the spherical alumina powder compacts prepared in 0T, which did not hold the particle orientation.The experimental results indicate that sintering shrinkage of spherical alumina powder compact depends onalumina crystal axis direction. Origin of the sintering shrinkage anisotropy for the spherical alumina powdercompacts can be attributed to the particle orientation caused by high magnetic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.293.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and Microstructure of Bauxite Ceramic Microsphere (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1124-1126 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, microspheres were prepared by using Chinese bauxite as raw materials throughcentrifugal spray drying method. The microstructure and composition of ceramic microsphere wereinvestigated by X-ray diffraction, scanning electron microscope and X-ray energy spectrum. The particlesize was 10~100#m. The XRD analysis reveals that the main crystalline phase of the ceramic microspherewere α-Al2O3 and mullite (3Al2O3•2SiO2). The Al2O3 content (chemical composition) of the microsphereswas little more than 70%, and the molar ratio of Al2O3/SiO2 was near to the molar ratio of aluminaand silica of mullite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1124.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Photocatalytic Degradation of Methyl Orange on ZnO in Aqueous (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1983-1985 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The photocatalyst of nanometer ZnO powder was prepared by precipitation method withZnSO4⋅7H2O and Na2CO3 as raw materials. Laboratory experiments with methyl orange (MO) as themodel pollutant have been carried out to evaluate the photocatalytic activity of nanometer ZnOphotocatalyst. A high-pressure mercury lamp was used as the energy source for the photocatalyticexperiments. The effects of process parameters such as catalyst loading, initial methyl orange concentration,pH and electrolyte on the photodegradation have been investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1983.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Control of Ceramic Material Microstructure with Super High Magnetic Field (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 688-690 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A new control method of the particle orientation structure with super high magnetic field isstudied for Al2O3 ceramics. Al2O3 slurry was made with two types of Al2O3 particles, which one wasspherical shape of, and the other one was elongated shape of. The Al2O3 ceramics of orientation structurewas fabricated by drying the Al2O3 slurry under the super high magnetic field, cold isostatic pressing (CIP)and sintering. Effects of particle shape, particle size, the solid loading, slurry viscosity, dispersant contentand the magnetic field strength on the particle orientation structure were examined in detail. Theexperimental results indicate that even the spherical Al2O3 particles can align under the magnetic field;the particle orientation degree changes with the particle shape and the solid loading under same magneticfield strength conditions, and the elongated particle system is easier to align than the spherical particlesystem; the particle orientation degree of the Al2O3 ceramics can be controlled by adjusting the particleshape, particle size, solid loading, slurry viscosity, dispersant content and magnetic field strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.688.pdf
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