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 44, Issue 11
Displaying 1-7 of 7 articles from this issue
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  • Effect of Adding Methods of Neutralizer on Rheological Behavior of Alumina Water-base Suspension and Properties of Green Sheets Using Acrylic Polymer
    Kouichi Nagata
    2007 Volume 44 Issue 11 Pages 784-789
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.784
    JOURNAL FREE ACCESS
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    The effect of adding methods of neutralizer of ammonium hydroxide on the rheological behavior of alumina/water suspension with acrylic polymer and the properties of green sheets prepared from the suspension was investigated. The acrylic polymer used in the present work had the acid value of 20mgKOH/g and glass transition temperature of -15 degrees Celsius. The viscosity of aqueous polymer solution increased from 0.1 to 10.0 Pa·s with the added amount of ammonium hydroxide, indicating that the polymer was a kind of polyelectrolyte. The neutralizer was added (1) after the preparation of the suspension, (2) during the preparation of suspension, and (3) prior to the preparation of suspension i. e., mixed with the aqueous polymer solution. With method (1), the suspension required a long period of time to have a stable viscosity because the viscosity increased after the addition of ammonium hydroxide and then gradually decreased with the maximum viscosity of suspension at 24 h after the mixing. The measurement of adsorbed amount of polymer on Al2O3 suggested that neutralization of free polymer occurred competing the polymer desorption from Al2O3. On the other hand, with methods (2) and (3), the viscosity did not change with time. The packing degree of green sheets prepared from the suspension was large in the order of (1), (2), (3), indicating that the adding method of ammonium hydroxide greatly alters the properties of the suspension and green sheets.
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  • Effect of Pipe Diameter Ratio on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe
    Minoru Fukuhara, Tomohiro Omure, Akihiro Ikeguchi, Hiroshi Katanoda, N ...
    2007 Volume 44 Issue 11 Pages 790-797
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.790
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    In the negative pressure system of pneumatic conveying, the authors previously proposed a highly-dense and therefore highly-efficient feeding of a powder, which was equipped with an injection pipe in the center of the suction nozzle. In this paper, we examined the effect of pipe diameter ratio of injection pipe to suction nozzle on the loading ratio and nozzle efficiency. As a result, it was found that the optimum pipe diameter ratio exists for a given condition. The particles behavior near the suction nozzle at a different pipe diameter ratio was identified through the particle flow visualization.
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  • Preparation of Aluminum Nitride Ceramics by Aqueous Slip-Casting
    Hisanori Yokoyama, Yoshihiro Todaka, Yasushi Imoto, Hiroya Abe, Makio ...
    2007 Volume 44 Issue 11 Pages 798-805
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.798
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    Aqueous formulations were developed for slip casting of aluminum nitride (AlN) powder without surface treatment. The hydrolysis reaction was suppressed by preparation of the aqueous slurry with the polymer dispersant mixed under 15°C. The 80mass% slurries with dispersant content of above 0.3mass% showed low viscosity and the AlN powders prepared from these slurries by drying had a low oxygen content. The sintered bodies prepared by the aqueous slip casting retained high density and good thermal conductivity. The thermal conductivity of the AlN sintered body with 5mass% Y2O3 prepared from aqueous processing reached to 177W/(m·K).
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  • Particle Size Distribution Measurement Methods by Use of Classification Effect during Anisokinetic Sampling
    Hirofumi Tsuji, Hisao Makino, Hideto Yoshida
    2007 Volume 44 Issue 11 Pages 806-812
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.806
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    This article reviews the advanced measurement methods for particle size distribution in gas-particle flow by use of anisokinetic sampling. These methods utilize the classification effect during anisokinetic sampling. When the sampling velocity is different from the main flow velocity, the measured particle concentration deviates from the concentration in the main flow. This sampling error is expressed as a function of velocity ratio (main flow velocity/sampling velocity), sampling probe diameter and the particle size. The classification effect and the procedure to measure particle size distribution are summarized in the present paper. This review also presents the application results of these methods to the particle size distribution measurements of dusts and fly ash generated in a pulverized coal combustion test furnace.
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  • DOCTORAL THESIS INTRODUCTIONS
    2007 Volume 44 Issue 11 Pages 823-824
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.823
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  • International Conference on Multiphase Flow 2007: Leipzig
    Takuya Tsuji
    2007 Volume 44 Issue 11 Pages 825-826
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.825
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  • Annual Report of Working Group on Measurement and Analysis of Powder Properties, 2005·2006
    Masayoshi Fuji
    2007 Volume 44 Issue 11 Pages 827
    Published: November 10, 2007
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.44.827
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