TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1972, Issue 68
Displaying 1-5 of 5 articles from this issue
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  • Determination of Electric Current Capacity of Electrode by Means of Fracture with Electric Current (2)
    Masahiko Okamura, Junichi Kon
    1972 Volume 1972 Issue 68 Pages 2-9
    Published: February 05, 1972
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1972.2
    JOURNAL FREE ACCESS
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    Graphite specimens were fractured with an electric current under tensile load for the purpose of determining the electric current capacity of electrodes. Judging from the phemomena attending the fracture, it is presumed that the fracture was caused by sublimation of the specimens.
    The following relationship exists between the current density and the fracture time.
    i=At-n
    where i is the electric current density and t, the fracture time. n=0.4. The constant A is decided according to the specimen used.
    The changes of temperature distribution and thermal stress distribution during the experiment were calculated with an electronic computer. The same relationship was obtained as that between the current density and the fracture time. Judging from the calculated results, it is also presumed that the fracture is caused by sublimation of the specimens.
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  • Catalytic Graphitization of Carbon by Iron
    Sugio OTANI, Asao OYA, Takeshi UTSUGI
    1972 Volume 1972 Issue 68 Pages 10-15
    Published: February 05, 1972
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1972.10
    JOURNAL FREE ACCESS
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    It was studied by using Fe powder that the effects of the kind of carbon on the catalytic graphitization.
    Raw carbon materials used in this experiment were three kinds of carbons with various graphitizability from coal tar pitch and typical non-graphitizable carbon from phenol formaldehyde resin. The raw carbons were heated up to 900°C and then were crushed to under 100 mesh. The additional amounts of Fe powder (under 325 mesh) were 1, 3, and 5 wt% respectively. The mixture of the carbon and Fe powder were heat-treated at the temperature range from 1200°C to 1800°C for 1 hour under N2 gas.
    Three kinds of effects were caused by the addition of Fe powder, that is, (1) the deposition of the graphitic structure component, (2) the deposition of turbostratic structure component, and (3) the improvement of the crystallinity of residual broad component. Behavior of (3) was observed in all kinds of the carbons and was more remarkable in the graphitizable carbon. In addition, this behavior was enhanced with the increase of HT T. The behavior of (1) was also observed in all carbons, and the depositting amount of this component was increased with the deterioration of the graphitizability of carbon specimens and with the increase of HT T. The turbostratic structure component was depositted only in the non-graphitizable carbons at above 1400°C of HTT.
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  • [title in Japanese]
    [in Japanese]
    1972 Volume 1972 Issue 68 Pages 16-22
    Published: February 05, 1972
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1972.16
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1972 Volume 1972 Issue 68 Pages 23-29
    Published: February 05, 1972
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1972.23
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1972 Volume 1972 Issue 68 Pages 29-33
    Published: February 05, 1972
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1972.29
    JOURNAL FREE ACCESS
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