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 21, Issue 11
Displaying 1-7 of 7 articles from this issue
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  • Effects of Measurement Conditions on Particle Sizing in the Laser Diffraction Technique
    On the Spatial Density, Sampling Position and Optical Setting
    Mitsushige NAKAYAMA, Takahisa ARAKI, Chuji TAKAHASHI
    1984 Volume 21 Issue 11 Pages 691-696
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.691
    JOURNAL FREE ACCESS
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    It usually takes time to measure the particle size and/or size distribution. Using a novel laser particle sizer based on Fraunhofer diffraction theory, the measurements are done in situ and rapidly.
    The purpose of this report is to investigate the effects of measurement conditions on the representative particle size XR and index W in the Rosin-Rammler equation, that is, spatial number density, sampling position from a Fourier transform lens and so on.
    By the use of glass beads of a known size, the results of measured values, XR and W, were compared with the value from microphotograph method. These experimental results indicated that the upper limits of spatial number densities in this experiment were, for example, 8×104 particles/cm3 for beads below 44μm sieve and 103/cm3 for 177μm-250μm respectively, and the most suitable sampling position for satisfactory accuracy was within a distance from the lens equal to the focal length of the Fourier transform lens. Setting three different focal lengths of the lens for the same sample, the results of the measured values XR and W agree fairly well with each other.
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  • Crystallite Size and Lattice Strain of Various Kinds of Silicon Nitride Powders
    Yoshinori KANNO
    1984 Volume 21 Issue 11 Pages 697-698
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.697
    JOURNAL FREE ACCESS
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    Crystallite size and lattice strain of commercial silicon nitride powders were calculated by Hall's equation from the powder X-ray diffraction patterns. α-percent in the crystal phase of silicon nitride powders was determined by using a calibration curve. Silicon nitride powder obtained from the nitridation of metallic silicon powders have a tendency to show little lattice strain and large crystallite size. The powder produced from silica showed large lattice strain. The powder synthesized from ammonolysis of SiCl4 and vapor phase reaction showed little crystallite size and a large littice strain.
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  • [title in Japanese]
    Shinya HAYASHI
    1984 Volume 21 Issue 11 Pages 699-703
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.699
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yoshihisa MATSUDA, Etsuko TATSUMI
    1984 Volume 21 Issue 11 Pages 704-714
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.704
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Akira YOKOGAWA
    1984 Volume 21 Issue 11 Pages 715-723
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.715
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1984 Volume 21 Issue 11 Pages 724-731
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.724
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Nobuyoshi NISHIHARA
    1984 Volume 21 Issue 11 Pages 732-733
    Published: November 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.732
    JOURNAL FREE ACCESS
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