Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 41, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Preparation of Au/Ag Alloy Particles by Spray Pyrolysis and Its Applications
    Noritaka Iida, Kazutaka Nakayama, Kikuo Okuyama, I. Wuled Lenggoro
    2004 Volume 41 Issue 4 Pages 246-251
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.246
    JOURNAL FREE ACCESS
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    Submicron particles of Au-Ag (gold-silver) binary alloy were directly prepared using an ultrasonic spray pyrolysis (SP) method. A stable solution of Au(OH)3/HNO3 and AgNO3/HNO3 was prepared without hydrochloric acid. The particles prepared were spherical in shape and had prescribed composition ratio of Au-Ag. The applications of Au-Ag particles as electronic and ornamental materials were investigated by fabricating electrode pastes as well as paint for use in pottery. The electrode made by the present alloy particles had a higher heat resistance than those of mechanically mixed Au/Ag particles. The paint on the pottery plate derived from Au/Ag alloy particles was slightly-blue mat gold color.
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  • Mechanism and Rate of Composition by the Rotating Drum Method
    Mikihiko Kobayashi, Takeshi Konno, Mitsuru Egashira, Kyoko Saito, Nori ...
    2004 Volume 41 Issue 4 Pages 252-258
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.252
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    We developed a rotating drum method for preparing composite particles of PTCR (positive temperature coefficient of resistivity) and solder. The mechanism and the rate of composition by the rotating drum method are studied, because the surface coverage of the PTCR particles is an important factor in order to fabricate thin and flexible PTCR sheets from the composite particles. Since semiconducting BaTiO3 is irregular in size and shape, zirconia balls of 200, 400 and 650μm are used. Composition rapidly proceeded during the initial first hour. After 1 hour, the solder particles adhered at a constant rate. The rate decreased linearly with a decrease of particle size, and the composition of 200μm zirconia balls did not progress after 1 hour. Analysis of solder particles showed that the average particle size of residual solder increased with the processing time. Observation by SEM showed that the surface of solder particles was marred by collisions resembling the shot peening after 12 hours' processing of composition. It was concluded that the change of composition rate at 1 hour processing is due to the variation of size distribution and work hardening of solder particles.
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  • Production of Polymeric Nanocomposites Using Mechanochemical Polymerization
    Mitsumasa Kimata, Itsuo Takahashi, Masahiro Hasegawa
    2004 Volume 41 Issue 4 Pages 259-265
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.259
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    Polymerization of styrene and methyl methacrylate were mechanochemically initiated by grinding montmorillonite particles in a vibrating ball mill. The effectiveness of mechanochemical polymerization was discussed through the characterizations of the polymer/particle composites and montmorillonite particles. As a result, it was shown that both monomers are polymerized by the grinding of montmorillonite. The products obtained were the composites of montmorillonite particles and polymer with size ranging from several tens nm to several hundreds nm. Relevant measurements suggested that the polymerization of styrene proceeds by cationic polymerization whereas that of methyl methacrylate occurs by radical polymerization. The large molecular weight of the resulting polymer could be explained by the lamellar structure of montmorillonite particles filled with monomers. Mechanochemical polymerization is expected to be one of the promising processes for polymeric nanocomposite production.
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  • Analysis for Flow and Feed Rate Characteristics of Injection Feeder with Bleeding Holes
    Hiroshi Ueda, Kiyoshi Horii, Yuji Tomita
    2004 Volume 41 Issue 4 Pages 266-274
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.266
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    The effect of bleeding holes has been studied on a pneumatic conveying system consisting of injection feeder. The essential feature of the system is the control of particle feeding rate by bleeding off supplemental air just behind the feeder which results in an increase in particle flow rate. In this paper, the characteristics were investigated theoretically. The theoretical results agree well with the measurements in terms of air flow rate and particle flow rate.
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  • Shape Problem on Laser Diffraction Method
    A Discussion on Particle Shape and Case Studies
    Tatsushi Matsuyama, Hideo Yamamoto
    2004 Volume 41 Issue 4 Pages 275-282
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.275
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  • [title in Japanese]
    Kuniaki Gotoh
    2004 Volume 41 Issue 4 Pages 292-294
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.292
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  • [title in Japanese]
    [in Japanese]
    2004 Volume 41 Issue 4 Pages 296
    Published: April 10, 2004
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.41.296
    JOURNAL FREE ACCESS
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