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  • 2005-2009  (4)
  • 1995-1999  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    A Chemical Route to Large-Scale Preparation of Spherical and Monodisperse Ni Powders (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A facile chemical route to prepare a well-defined Ni powder on a mass-production scale without external heating was suggested. A highly concentrated Ni complex was formed between NiCl2 and N2H4 solution, and subsequent addition of NaOH solution triggered serial reactions from the Ni complex decomposition via Ni(OH)2 formation to the reduction of a Ni(OH)2 gel into well-defined Ni spheres. The high temperature necessary for the reaction was attained not by external heating but by exothermic reactions such as complex formation and reduction. The preparation of monodisperse and spherical Ni powder was attributed to uniform distribution of the reducing agent (N2H4) within the Ni(OH)2 gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00582.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Uniform Coating of Nanometer-Scale BaTiO3 Layer on Spherical Ni Particles via Hydrothermal Conversion of Ti-Hydroxide (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A uniform BaTiO3 nano layer was coated on spherical Ni particles for multilayer ceramic capacitor applications via a Ti-hydroxide coating using the controlled hydrolysis of a TiCl4 butanol solution containing (C2H5)2NH (diethylamine, DEA) and its subsequent hydrothermal reaction at various [Ba(OH)2], residual [DEA], and hydrothermal temperatures. The hydrothermal conversion was successful at [Ba(OH)2]≥0.065M (Ba/Ti≥1.3) and T≥150°C, and the residual DEA in the Ti-hydroxide coating layer not only affected the formation of the BaTiO3 phase but also resulted in a rough surface morphology. When a minimal amount of DEA was involved in the formation of Ti-hydroxide, a uniform BaTiO3 coating with a clean surface morphology could be attained, which was confirmed by elemental mapping of the coated powder and the observation of hollow spheres after removing the Ni core. The BaTiO3 coating was very effective not only in preventing Ni oxidation but also in shifting the starting point of Ni densification to a higher temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00104.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nano Magnetite Particles Prepared under the Combined Addition of Urea and Ammonia (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 203-206 
    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: Magnetite (Fe3O4) particles were prepared for biomedical application through threedifferent routes. Each route had the difference in the selection of pH controlling agents. Ammonia,Urea and combined use of ammonia and urea were tested in the synthesis through co-precipitation.With the combined use of urea and ammonia, the size of particles could be reduced as small as 10 nmwhile effectively suppressing the agglomeration among particles. The surface charge measured atphysiological condition explained the good dispersion behavior of nano-magnetite particles. Thesuperparamagnetism observed in nano magnetite particles was expected to be useful for biomedicalapplication in the respect of magnetic localization and dispersion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.203.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructures and Tensile Properties of Fe-40Al Intermetallic with High Boron Content (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 350-353 
    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: The effects of B addition up to 0.4 wt% (i.e., 1.61 at%) to Fe-40Al alloy onmicrostructures and tensile properties were investigated. The vacancy-annealed specimens following casting and extrusion were examined by optical and scanning electron microscopy and thermal neutron-induced microradiography. The addition of a large amount of B resulted in grain refinement and changed the fracture mode from intergranular to transgranular to increase the tensile elongation. Especially, the alloy containing 0.3wt% B exhibited the elongation of 16.4% under the strain rate of 1x100s-1 at room temperature. The increase in elongation with increasing strain ratewas discussed in terms of suppression of hydrogen embrittlement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.350.pdf
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of spherical Pb(Zr, Ti)O3 powders by ultrasonic spray pyrolysis (1995)
    Springer
    Journal of materials science 6 (1995), S. 84-89 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Spherical Pb(Zr,Ti)O3 powders were prepared from the aqueous acetate-base solution by ultrasonic spray pyrolysis. The raw materials were Pb(C2H3O2)-3H2O, ZrO(C2H3O2)2 and a mixture of Ti(C3H7O)4 and C5H7O2. A single-phase PZT was formed at 900
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188189
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of spherical Zr0.8Sn0.2TiO4 powder by ultrasonic spray pyrolysis (1995)
    Springer
    Journal of materials science 30 (1995), S. 3274-3278 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fine, spherical Zr0.8Sn0.2Tio4 powders were prepared by spray pyrolysis, using an ultrasonic transducer, from an aqueous solution of metal chlorides. The synthesized powders had a spherical morphology and many shell fragments. The observed shell fragments were attributed to the impermeable surface crust formed during thermal decomposition of the droplets. The raw materials for the preparation of Zr0.8Sn0.2TiO4 were analysed prior to any treatments because the properties of the surface crust could be related to those of the raw materials. ZrOCl2·8H2O was supposed to affect the shell fragments as well. Spherical Zr0.8Sn0.2TiO4 powders without shell fragments could be prepared using ZrO(CH3COO)2 in place of ZrOCl2·8H2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209249
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    Paper (German National Licenses)
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