TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 5, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • On the Spiral Growth of Graphite Crystals
    Takuro Tsuzuku
    1955 Volume 5 Issue 1 Pages 2-7_2
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.2
    JOURNAL FREE ACCESS
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    Layer growth patters, concentric hexagonal and circular loops, have been observed on the artificial graphite prepared by heat-treatment of carbon black seast 116. Some electron microscope and diffraction data are given. And it is concluded that these patterns are taken as the spiral growth steps, in accordance with the prediction of Frank's theory, expected when some screw dislocation rows emerge on the crystal faces.
    From the view point of dislocation theory a brief discussion is tried on certain features of graphite. The numerical values of radii of the critical nuclei are calculated 80-270Aring; as well as the supersaturation of vapour pressure 2.5-8%. The step heights in spirals have been estimated to be 150-250Å, which may suggest that scores of initial dislocation with unit strength are crowded in the core. of each crystal.
    A new concepts, termed as “turbinal layer structure”, is proposed to explain the characteristic structure of those crystals which produce circular growth patterns in micrograph and sporty Debye-Scherrer rings, accompanied by ellipses in diffraction diagram.
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  • The Electrical Conductivity of Carbons
    Hiroo Inokuchi, Kazumi Tooi
    1955 Volume 5 Issue 1 Pages 7-11
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.7
    JOURNAL FREE ACCESS
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    The electrical resistivity of carbons was measured by the potential drop methods. When car-bons were used as powdered form, the measurement of resistivity (ρ) depended strikingly upon the compressive pressure (p), and their relation was illustrated as follows;
    ρ=a/p+b
    The extrapolated values of resistivity (ρ∞= b) were classified to next groups by their linear extensions of layer planes of crystallites (a); graphite 0.029Ωcm., a > 400Å, acethylene black 0.077Ωcm., -40Å, pitch cokes (calcinated at-1100°C) 0.083Ωcm., -40 Å, pitch cokes 0.26Ωcm., -20 A, carbon black 0.32Ωcm., 20Å - 30Å, charcoal-103Ωcm., -10Å. and the resistivity of pitch is 107Ωcm. The activation energy (Δ∈) calculated from the temperature dependency of resistivity is very small, for example Δ∈ of carbon black is the order of 10-2- 10-3 eV. While some sorts of graphites (carbon brush) have shown transition from semi-conduction to metallic conduction at a certain temperature, ranged from 400°C to 500°C.
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  • Research on Metal-Graphite Brush
    Tatsuo MATSUKAWA, Keiichirii SHOJI
    1955 Volume 5 Issue 1 Pages 11-17
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.11
    JOURNAL FREE ACCESS
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    Metal-graphite brushes are produced by 10-40% graphite, 0.1-10% lead and the rest copper by powder metallurgy. In this investigation copper-lead-alloy coated graphite powder invented by the author is used instead of employing individual powder. In this coated powder method, the distribution of copper, lead and graphite is uniform and the combination of metal and graphite is tight remarkably as compared with in ordinary method. Therefore, the characteristics of the brush…abrasiveness, cross braking strength, electrical resistivity, wearing etc…show superior results.
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  • Studies on Acetylene Blacks (Part 2)
    Crystal Structure, Particle Size and its Shape
    Gen-ichi Yamauchi
    1955 Volume 5 Issue 1 Pages 18-22
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.18
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    It was previously shown that the most suitable blacks for dry cells must simultaneously satisfy three conditions. In this paper, studies of graphitic nature of the primary particle, size of the secondary aggregated particle and degree of the chainlike structure have been made by the Xvay diffraction patterns and the electron micrographs.
    The obtained results seem to show that as the crystal structure of acetylene black approaches to a more graphitic forme, size of the aggregated particle decreases and length of the chainlike structure increases in some conditions applied in the production process.
    However it is not so much important to makes develope the graphitic structure rather than the secondary and chainlike structure.
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 5 Issue 1 Pages 23-26
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.23
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  • [title in Japanese]
    J. F. Archard
    1955 Volume 5 Issue 1 Pages 27-30
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.27
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 5 Issue 1 Pages 31
    Published: November 04, 1955
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.5.31
    JOURNAL FREE ACCESS
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