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 15, Issue 9
Displaying 1-8 of 8 articles from this issue
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  • A Characteristic Classification of Powders by Direct Shear Test
    Kejiro TERASHITA, Kei MIYANAMI, Motoshige YOSHIDA, Takeo YANO
    1978 Volume 15 Issue 9 Pages 515-525
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.515
    JOURNAL FREE ACCESS
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    A direct shear tester with constant vertical loads has been developed which can measure simultaneously the shearing force and vertical displacement of powder bed under shearing with variable shearing cell diameter and shearing rate. The relations of the shearing stress and the vertical strain to the horizontal shearing strain (shearing process diagrams) have been determined under venous test conditions for 34 variety of powders, and it has been found that the patterns of the shearing process diagrams can be classified into one of 15 categories according to the characteristics of the powders and the test conditions.
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  • Internal Friction Factors of Powders by Direct Shear Test
    Keijiro TERASHITA, Kei MIYANAMI, Takao YAMAMOTO, Takeo YANO
    1978 Volume 15 Issue 9 Pages 526-534
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.526
    JOURNAL FREE ACCESS
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    Apparent internal friction factors of powders have been evaluated under various test conditions by a direct shear tester providing the following four sets of shearing stress-normal stress diagram, and compared with each others; (i) maximum shearing stress (τx, max)—applied normal stress (σz, w), (ii) steady shearing stress (τx, s)—σz, w, (iii) τx, max—actual normal stress (σz, m—measured directly by three pressure sensors in the vicinity of the shearing plane and averaged), and (iv) τx, s—σz, m diagrams. Among these diagrams, the τx, s—σz, m relation gives the internal friction factor which is fairly independent of the test conditions and can be arranged in the order of Carr's flowability index for respective powders.
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  • Changes in Surface Properties of Potassium Halide Mixtures Due to Moisture Absorption
    Masatoshi CHIKAZAWA, Mamoru KAIHO, Takafumi KANAZAWA
    1978 Volume 15 Issue 9 Pages 535-540
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.535
    JOURNAL FREE ACCESS
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    Two samples, A and B, were prepared by manual mixing of KBr and KI powders and by pouring an aqueous mixed solution of KBr and KI into ethyl alcohol, respectively. Water vapor absorption isotherms, changes in surface area and surface electrical conductivity with water vapor pressure were studied for the above samples. The thickness of the adsorbed water layers required to cause changes in their surface properties was estimated from the water vapor adsorption isotherms. The monolayer adsorption on the samples A and B were accomplished at 10%rH. On the other herd, water molecules of two times volume of the monolayer capacities were adsorbed at 27 and 40%rH for A and B, respectively, and subsequently the surface areas of the mixed salts began to decrease. When these adsorptions are completed, the adsorbed molecules are considered to contact each other, assuming the a cross-sectional area of 10.6Å2 for a water molecule. Therefore, two-dimentional contact among the adsorbed water molecules will be necessary for forming hydrated ions, which can easily migrate on the surface. The characteristics of the mixed salts in a moisture absorption process are found to be as follows: (I) The surface of a mixed salt is more heterogeneous than that of single salt powder. (II) The volume of adsorbed water molecules per unit surface area of the mixed salt is larger than that obtained for KBr or KI sample under a fixed water vapor pressure. (III) A water vapor pressure under which a surface property of the mixed salt begins to change is lower than that determined in the case of KBr or KI particle.
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  • [title in Japanese]
    [in Japanese]
    1978 Volume 15 Issue 9 Pages 568
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.568
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1978 Volume 15 Issue 9 Pages 568a-569
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.568a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1978 Volume 15 Issue 9 Pages 569-570
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.569
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1978 Volume 15 Issue 9 Pages 570-571
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.570
    JOURNAL FREE ACCESS
    Download PDF (289K)
  • [title in Japanese]
    1978 Volume 15 Issue 9 Pages 571
    Published: September 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.571
    JOURNAL FREE ACCESS
    Download PDF (145K)
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