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 48, Issue 7
Displaying 1-4 of 4 articles from this issue
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  • Particle Size Measurement by Hydrostatic Pressure Measurement Method —Effect of Initial Concentration
    Hiroshi Satone, Kazuki Nishiuma, Kenji Iimura, Michitaka Suzuki, Takam ...
    2011 Volume 48 Issue 7 Pages 456-463
    Published: July 10, 2011
    Released on J-STAGE: July 20, 2011
    DOIhttps://doi.org/10.4164/sptj.48.456
    JOURNAL FREE ACCESS
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    The hydrostatic pressure measurement method is one of the settling methods of a particle size distribution measurement. We measured the particle size distribution of the alumina slurries by this method and investigated the effects of the slurry concentration. However, the measured cumulative undersize is evaluated to be smaller than the true value at the high concentration because of the hindered settling. Therefore, in order to correct this phenomenon, we tried to use several equations of hindered settling suggested until now and the experimental equation. As a result, the particle size distribution of high concentration slurry can be measured without any dilution operations by using fitted experimental equation. Furthermore, the mean particle size measured by this method was closer to nominal value than the one measured by the laser diffraction method.
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  • Fundamental Study on a Structure Simulation for the Powder Products
    Shin Mizutani, Mikio Sakai, Kazuya Shibata
    2011 Volume 48 Issue 7 Pages 464-472
    Published: July 10, 2011
    Released on J-STAGE: July 20, 2011
    DOIhttps://doi.org/10.4164/sptj.48.464
    JOURNAL FREE ACCESS
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    There are many products manufactured by powder compacting presses. In the past studies, the structural analyses of the product were performed by Finite Element Method (FEM). In these analyses, cavities which were occurred in the injection could not be taken into consideration. Namely, the analyses were performed under the assumption that the products were packed homogeneously. On the other side, the simulations of powder process were often performed by the Discrete Element Method (DEM). Accordingly, the structural analysis taking into account the particle condition could not be performed practically. Thereat, a new structure analytical method, which is referred to Finite Deformation theory based Particle Method (FD-PM), was developed to introduce the packing condition into the structural analyses. In this method, the particle location, i.e., random packing, could be simulated by the DEM. This location is used in the FD-PM as the calculation points. Numerical simulations of a cantilever oscillation were performed to investigate the adequacy of the FD-PM. Effects of the particle location on the structural analyses were investigated in this study. The oscillation cycle obtained from the simulations was compared with the theoretical one. The oscillation cycles were in good agreement between the simulations and the theoretical results. It is concluded that the FD-PM can simulate the oscillation of the cantilever composed of the randomly packed powder accurately.
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  • Effect of Carbon Addition on Structural Formation and Battery Characterization of LiMnPO4 Particles
    Jun Yoshida, Shinji Nakanishi, Hideki Iba, Hiroya Abe, Makio Naito
    2011 Volume 48 Issue 7 Pages 473-478
    Published: July 10, 2011
    Released on J-STAGE: July 20, 2011
    DOIhttps://doi.org/10.4164/sptj.48.473
    JOURNAL FREE ACCESS
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    Li-ion batteries are paid attention because of its high energy density and high power. LiMnPO4 is a good candidate for a cathode material due to high potential (4.1V) and high thermal stability. However, LiMnPO4 has to be coated carbon on the surface of particles to compensate the low electron conductivity. In this study, we investigated the influence of carbon addition to LiMnPO4 particles for crystal structure and particle size changes. These characters have been measured by XRD. It can be stated that the carbon layer on the surface hinder from growing the particle size. As a result of this, the size of crystallite was smaller as compared with that of pristine LiMnPO4 particles. The sample heated at 700°C exhibited a specific capacity of 70 mAh / g at 0.2 C. This was the reason why the resistivity of the battery has become small with reducing particle size.
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