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  • 1
    Electronic Resource
    Electronic Resource
    Spray-Dried YSZ Ceramic Powders: Influence of Slurry Stability on Physical Characteristics of Agglomerates (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 465-470 
    Details
    ISSN: 1662-9752
    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: Zirconia stabilized with 8 mol% yttria (YSZ) is the most effective material for use aselectrolytes in solid oxide fuel cell. Ceramic powders of YSZ were synthesized in IPEN bycoprecipitation route and are composed by fine particles (less than 01μm) with large surface area(~60m2.g-1). These powders have a strong tendency to agglomerate. and it make difficult thecompaction process and to achieve a good density. To exert control over the compaction process.the powders were spray dried to obtain spherical granules. Thus the stability of slurries of thesepowders was studied by adding ammonium polyacrylate (Duramax D3005) as dispersant and thesuspension stability was measured by electrophoretic mobilities. Slurries prepared with the betterconditions were dried in a laboratory scale spray dryer. The prepared granules were characterizedby morphology observation (SEM). surface area (BET). Vickers hardness and sintered ceramicsbodies density were measured
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.465.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Combustion Synthesis of NiO/YSZ Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 777-783 
    Details
    ISSN: 1662-9752
    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: Nickel oxide-yttria stabilized zirconia (NiO-YSZ) anode materials were synthesized bycombustion process involving metal nitrate-urea decomposition. The precursor was heated toevaporate water undergoing dehydration, and then the mixtures froth and swell. Further heatingproduces large amounts of gases that ignite at ambient atmosphere. Different nitrate/urea initialmolar ratios were employed in order to investigate the influence of the reaction temperature in thephysical characteristics of the powder composite. The flame temperature was measured by infraredoptical pyrometer. The combustion was rapid and self-sustaining, with flame temperatures rangingfrom 870 to 1330°C. The as-synthesized powders were uniaxially pressed and sintered in air.Powders were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy(SEM), helium picnometry for density measurements and gas adsorption technique (BET). Theceramic samples were evaluated by SEM and Archimedes density measurements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.777.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of NiO-8YSZ Powders by Coprecipitation Route (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 498-499 (Nov. 2005), p. 612-617 
    Details
    ISSN: 1662-9752
    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: Nickel oxide – 8 mol% yttria stabilized zirconia (NiO-8YSZ) powders containing 25 to 75 wt% of NiO were prepared by coprecipitation. The entire process includes the reaction of metals aqueous chloride solutions (heated at 95 oC) with ammonium hydroxide, washing steps of the resulting gel, butanol azeotropic distillation treatment to prevent the formation of hard agglomerates, drying, calcination and ball milling. The yield of precipitation of metals was determined by inductively coupled plasma atomic emission spectroscopy analysis (ICP-AES). Powders were characterized by X-ray and laser diffraction, infrared analysis, gas adsorption (BET) and scanning electron microscopy. It was observed that zirconium and yttrium hydroxides are easily precipitated in alkaline medium, while nickel precipitation yield is in the range of 80 to 95% due to the formation of soluble complexes. NiO appears as a second phase in synthesized powders and contributes to decreasing of specific surface area and agglomerate mean size
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.498-499.612.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Particle Size Distribution Analysis of an Alumina Powder: Influence of Some Dispersants, pH and Supersonic Vibration (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 498-499 (Nov. 2005), p. 73-78 
    Details
    ISSN: 1662-9752
    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: It is well known that colloidal powder particles (between 1 mm and 0.001 mm) tend to agglomerate due to electrostatic forces. Then assuring an optimal dispersion condition is essential for good particle-size analysis results, since aggregates or weak agglomerates can be measured as single particles. In this paper the particle size distribution of an alumina powder A1000SG (ALCOA) was measured using distinct dispersion procedures. Distilled water was used as dispersant liquid in the pure state and with additives (citric acid and Duramax D-3005). Dispersion by supersonic vibration was also investigated, but only the application time was varied. Particle size analysis was accomplished by laser scattering technique and the dispersion condition was evaluated through zeta potential. The results showed that the Duramax’s electrosteric impediment is more efficient than citric acid’s electrostatic force, thereby providing better dispersion. Although useful, the supersonic vibration was not good enough to assure an optimal dispersion, at least for the material tested here
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.498-499.73.pdf
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