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 22, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • The Surface Active Site Distribution of Ceramic Powders Produced by the Ultra-fine Grinding
    SiC, Si3N4, SiO2
    Yoshinori KANNO
    1985 Volume 22 Issue 3 Pages 139-143
    Published: March 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.139
    JOURNAL FREE ACCESS
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    Silicon carbide, silicon nitride and silicon dioxide powders were finely ground by a vibration ball mill, a pot and balls which were made of silicon nitride ceramics, in a purified methanol medium free from water. The surface active site distribution of ground powders has been measured by Temperature-Programmed Desorption technique which was carried out by applying gas-chromatography, where ammonia gas was used as the probative molecule.
    As the result of the mechanochemical activation caused by the fine grinding, the concentration of active sites of ground powders increased remarkably with an increase in grinding time. The active sites were composed of weak and strong active centers. The surface active site distribution of ground powders varied with the grinding time, and differed from each compound powder. A method for seizing the topochemical information of active sites has been proposed.
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  • The Effect of the Pre-shear on the Shear Test of a Powder Bed
    Mitsuaki HIROTA, Toshio KOBAYASHI, Hironori TAJIRI, Hiroyuki MURATA, M ...
    1985 Volume 22 Issue 3 Pages 144-149
    Published: March 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.144
    JOURNAL FREE ACCESS
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    A parallel plate-type shear tester and Jenike's shear tester have been used to measure the failure properties of the powder beds formed by uniaxial compression and by pre-shear using Jenike's method. The experimental results were compared to each other in order to discuss the effects of the pre-consolidation method on the yield locus of the powder bed. The results are summarized as follows:
    1) The yield locus obtained from the tests of the pre-sheared powder bed is not affected by the type of shear tester.
    2) Under the same pre-consolidation stress, the yield locus of a pre-sheared powder bed is larger than that of a uniaxially compressed powder bed.
    3) The region of normal stress where a uniaxially compressed powder bed dilates with shear strain is confined to the low stress region in comparison with pre-consolidation stress.
    4) It is presumed that the void fraction near the shear plane of a pre-sheared powder bed is larger than the average void fraction of a powder bed.
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  • The Utilization of Wasted Fine Clayey Particles as Carriers in Solid Formulations
    Hideharu HIROSUE, Noriyuki YAMADA, Eiichi ABE
    1985 Volume 22 Issue 3 Pages 150-158
    Published: March 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.150
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    This paper describes How two kinds of porous particles made of wasted fine clayey particles (roseki) can be utilized as carriers in solid formulations.
    Firstly, spray-dried particles having a mass median diameter of approximately 24μm, which have been produced from roseki slurry by a spray drying method, have been utilized as a carrier in DL dust. Next, the other agglomerates having a mass median diameter of approximately 130μm, which have been made by coating pulverized Toyoura sand with roseki particles, have also been utilized as a carrier in F micro-granules.
    The conclusions obtained are summarized as follows:
    1.It was clarified by measuring the adhesive property of particles that both the spray-dried particles and the coated particles have to a certain degree the ability to imbibe liquids into them. This is completely different from the ability of carriers on the market.
    2. The DL dust and the F micro-granule prepared by impregnating the spray-dried particles and the coated particles, respectively, with agricultural chemicals, were found to nearly satisfy the standards which are generally used between the makers and users in regard to solid formulations. Then, the biological effectiveness of the newly developed solid formulations for insects was also recognized to be approximately equal to the effectiveness of the solid formulations on the market.
    3. The influence of the size and density of a particle on the distance drifted by air flow, was analyzed on the basis of the equation of motion of a spherical particle, and the analytical results were tabulated.
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  • [title in Japanese]
    Yoshiteru KANDA, Takashi YAMASHITA, Hisato SASAKI
    1985 Volume 22 Issue 3 Pages 159-160
    Published: March 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.159
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  • [title in Japanese]
    Yoshiaki ARAKAWA
    1985 Volume 22 Issue 3 Pages 161-170
    Published: March 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.161
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  • Erratum
    1985 Volume 22 Issue 3 Pages 195a
    Published: 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.3_195a
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  • Erratum
    1985 Volume 22 Issue 3 Pages 195b
    Published: 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.3_195b
    JOURNAL FREE ACCESS
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