TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1968, Issue 54
Displaying 1-5 of 5 articles from this issue
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  • Relations among X-ray parameters and Graphitization
    Process II.-Polyvinylchloride Coke
    Michio INAGAKI, Yoshio MURASE, Tokiti NODA
    1968 Volume 1968 Issue 54 Pages 80-83
    Published: August 31, 1968
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1968.80
    JOURNAL FREE ACCESS
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    The coke PV-7, prepared by carbonizing polyvinylchloride to 680°C, was heat-treated at different temperatures and residence times in the flow of nitrogen and under reduced pressure of about 0.02 Torr. On these heat-treated samples, the relations between mean lattice spacing c0 and crystallite sizes Lc (00l) and between strain along the c-axis εc and -c0 were investigated.The results are summarized as follows,
    1) The graphitization process of PV-7 seems to consist of two stages (-c0>6.85Å and c0<6.85Å), which were also found in the case of a petroleum coke as reported previously.
    2) The apparent crystallite size Lc (00l) of PV-7 is larger than that of the petroleum coke. This difference is explained to come from the difference in the real size of crystallite between them.
    3) The relation between εc and -c0 in the second stage of graphitization can be explained by the assumption that two kinds of interlayer spacing, 3.354 and 3.44Å, coexist in a packet of graphite-like layers.
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  • ON THE SHAPE OF PROFILES OF (00l) DIFFRACTION LINES OF GRAPHITE AND CARBONS
    Michio INAGAKI, Kan-ichi KAMIYA, Hajime SAITO
    1968 Volume 1968 Issue 54 Pages 84-92
    Published: August 31, 1968
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1968.84
    JOURNAL FREE ACCESS
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    The shape of the (00l) diffraction profiles of natural graphite and polyvinylchloride cokes (PV-7) heat-treated at various temperatures was investigated. In order to reduce the effect of X-ray absorption by the sample, the thickness of the specimen for X-ray diffraction was limited to 0.2mm. The observed diffracted intensity was corrected for Lorentzpolarization, atomic scattering and absorption factors by a conventional method.
    The observed profile of (002), (004), (006) and (008) diffraction lines of natural graphite was symmetrical. The profile of (002) and (004) diffraction lines of PV-7 heat-treated at various temperatures in the flow of nitrogen was also symmetrical, and it was concluded that each of these carbons consists of only one component having one kind of mean interlayer spacing. The carbons (PV-7) heattreated at relatively low temperature under 3 and 5 kbar had symmetrical profiles of (00l) diffraction lines. At higher temperature of heat treatment, however, the heat-treated carbons had composite profiles. These composite profiles could be separated into two symmetrical component profiles which corresponded to the structures having different mean interlayer spacings.
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  • Studies on Stress-Strain Relationships in Graphite (II)
    Junichi Kon, Masahiro Ohtani, Masayuki Katase
    1968 Volume 1968 Issue 54 Pages 92-98
    Published: August 31, 1968
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1968.92
    JOURNAL FREE ACCESS
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    The stress-strain relationships in tension were studied, by using several kinds of commercial graphite. These stress-strain relationships satisfy the empirical formula previously proposed by the authors in the case of compression.
    It has been found, however, that both the static modulus of elasticity and the decrease ratio of the apparent modulus are different from those in the case of compression.
    The discrepancy between the experimental results and the empirical formula at very low stress is considered to be attributable to the existence of residual stress.
    The stress-strain relationships under cyclic tension were also measured, and the relationships between maximum stress and residual strain in such cases were studied.
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  • THERMOELECTRIC POWER AND INTERNAL FRICTION OF SOME GRAPHITIC CARBONS
    R.E. Taylor, D.E. Kline, P.L. Walke
    1968 Volume 1968 Issue 54 Pages 99-101
    Published: August 31, 1968
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1968.99
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1968 Volume 1968 Issue 54 Pages 102-107
    Published: August 31, 1968
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1968.102
    JOURNAL FREE ACCESS
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