TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1969, Issue 56
Displaying 1-5 of 5 articles from this issue
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  • Pressure Distribution in Compacting Carbon Paste
    Fumio Mochizuki, Tadashi Sugiyama
    1969 Volume 1969 Issue 56 Pages 149-155
    Published: April 15, 1969
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1969.149
    JOURNAL FREE ACCESS
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    Pressure distribution in compacting carbon paste was measured by using strain-gages mounted on the outer surface of the steel molds . Compression of the carbon paste was performed by two methods, tamping and pressing, which were selected as typical impact and static compression methods, respectively.
    The results are summarized as follows:
    1) Under static compression, the pressure along an axial direction of the molded paste of low binder concentration decreases exponentially with the increase of depth . Pressure along a radial direction of the paste amounts only to about a half of that along an axial direction.
    2) Impact compression gives more uniform pressure distribution than static compression. Pressure induced in the paste depends on the height of the packing layer .
    3) The pressure distribution changes suddenly from the state of powder compression to that of liquid compression when the binder content exceeds a certain amount . This phenomenon gives a good estimation of the optimum binder content for carbon aggregates.
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  • Determination of Electric Current Capacity of Electrode by Means of Fracture with Electric Current (1)
    Junichi Kon, Masahiko Okamura
    1969 Volume 1969 Issue 56 Pages 156-161
    Published: April 15, 1969
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1969.156
    JOURNAL FREE ACCESS
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    Graphite specimens (diameter 15-25 mm) were fractured with electric current (current density 1, 000-2, 000 A/cm2) for purpose of determining the electric current capacity. Judging from the phenomena attending the fracture and an approximate calculation of thermal stress distribution, the fracture is presumed to be due to thermal stress and sublimation of specimens.
    The results obtained were as follows:
    (1) The relationship between the current density and length of time required for fracture is obtained by the following formula:
    i=At-n
    where n=0.3-0.4. The constant A is decided according to the specimen used.
    (2) When the fracture time is t=10 sec and the specimen's diameter is 20∅, the following relationships exist between fracture current density (i) and physical properties:
    Bulk density: i=430d2.5 d (g/cm3)
    Electric conductivity: i=25K0.6 K (mho/cm)
    Compressive strength: i=370S0.25 S (kg/cm2)
    Modulus of elasticity: i=60E0.5 E (kg/mm2)
    If the required time is extended to infinity, fracture does not occur. In this case fracture current density (i∞) represents the current capacity of the electrode.
    (3) Relationship between i∞ (A/cm2) and the radius of the specimen r (cm) is,
    i∞=Br-m
    In the case of an electrode whose properties are bulk density 1.57 (g/cm3) and specific electric resistance 1.18 (mΩ-cm), B is 260 and m is 0.7.
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  • Electron Spin Resonance in Sucrose Induced by Pyrolysis and X-ray Irradiation
    Sanchi Mizushima, Shigetaka Sugita, Kazuhiro Fujii
    1969 Volume 1969 Issue 56 Pages 162-164
    Published: April 15, 1969
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1969.162
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    Electron spin resonance studies were made on charred sucrose, which had been irradiated with x-rays after heat-treatment at different temperatures, to clarify the nature of spin centers produced by pyrolysis. Preliminary experiments were done on irradiated single- and poly-crystalline sucrose, the result agreeing with previous studies by other researchers. It was shown that in most cases the resonance due to irradiation behaves in different manner from that due to pyrolysis; the latter is quenched by the presence of air while the former is not, even when both types of spin centers are present in the specimen together. This and other observations indicate a possibility that irradiation-induced spin centers are immobile σ electrons whereas pyrolysis-induced ones mobile πelectrons.
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 1969 Issue 56 Pages 165-176
    Published: April 15, 1969
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1969.165
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  • [title in Japanese]
    [in Japanese]
    1969 Volume 1969 Issue 56 Pages 177-182
    Published: April 15, 1969
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1969.177
    JOURNAL FREE ACCESS
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    [in Japanese]
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