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 10
Displaying 1-7 of 7 articles from this issue
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  • Some Findings Necessary for the Analyses of a Solid-Solid Reaction
    Masahiro SHIRAI, Tatsuo TANAKA
    1985 Volume 22 Issue 10 Pages 683-687
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.683
    JOURNAL FREE ACCESS
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    A theoretical approach to the solid-solid reaction mechanism was first proposed by Jander with a model in which a component diffused through the contacting plane. Furthermore, Komatsu proposed a model in which a component diffused through the points in contact with the other component. However, in evaluating the number of contact points, an unsound assumption was made for a random packing of particles having different sizes, leading to erroneous reaction conversion. The mistake is proved in this paper for computing the correct conversion, and an important relationship is introduced stoichiometrically between the diffusivity ratio of two components through a contacting plane and that through a contacting point. The latter is likely to be misunderstood when both models are applied on a common basis.
    The present reaction model, in which by starting with a contact point the concentric spherical products are advancing towards the centre of a sphere of the other component, should be transformed, for simplicity, into the “shell model” before the ends of the product layers hit one another. This transition point is discussed in relationship to the number of contact points from different points of view.
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  • Calculating the Conversion of a Diffusion Controlled Solid-Solid Reaction
    Masahiro SHIRAI, Tatsuo TANAKA
    1985 Volume 22 Issue 10 Pages 688-692
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.688
    JOURNAL FREE ACCESS
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    Volumetric conversion of a solid-solid reaction, in which solid particles of one component are randomly packed with particles of the other component, is calculated with a model in which the reaction proceeds by mutual diffusion through the contacting points.
    Two periods are considered, i. e., the initial concentric spheres model period followed by the shell model period after the transition point. The both conversions are theoretically expressed as functions of four factors-dimensionless time, the diffusivity ratio, the size ratio and the volume fraction.
    The calculated conversion at the transition point can be regarded as a measure of a reaction of high efficiency for a given system and is graphically shown for design purposes.
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  • [title in Japanese]
    Shigeki TOYAMA, Hidetoshi MORI, Takeshi TANAKA
    1985 Volume 22 Issue 10 Pages 693-695
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.693
    JOURNAL FREE ACCESS
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  • Radomness in Glass Structure
    Itaru YASUI
    1985 Volume 22 Issue 10 Pages 696-700
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.696
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1985 Volume 22 Issue 10 Pages 712-723
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.712
    JOURNAL FREE ACCESS
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  • Erratum to : A New Measuring System of the Porosity Distribution Generated in Powder Bed
    1985 Volume 22 Issue 10 Pages 723
    Published: 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.10_723
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Shinichi YUU
    1985 Volume 22 Issue 10 Pages 724-725
    Published: October 10, 1985
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.22.724
    JOURNAL FREE ACCESS
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