TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1961, Issue 29
Displaying 1-9 of 9 articles from this issue
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  • Dislocation Theory of Graphitization
    Takuro Tsuzuku, Hirokuni Kobayashi
    1961 Volume 1961 Issue 29 Pages 2-6
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_2
    JOURNAL FREE ACCESS
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    It has been attempted to explain the mechanism of graphitization in terms of the dislocation theory.Eight fundamental modes of the inter-crystallite boundaries proposed, which are characterized severallyby the arrays of dislocations and point imperfections.
    The lateral extension of crystallites taking place even in the early stage of graphitization is attributed to the movement and consolidation of the so-called tilt boundaries which are mostly represented by the vertical alignments of edge-type dislocations. Possible driving forces of the crystallite growth are discussed, and the so-called graphitization stress caused by the interference between the anisotropically expanding crystallites is concluded to be most powerful one. Completion of tri-dimensional graphite structure at high temperatures above 2000°C is suggested to be made through the diffusion of the scrcw dislocation grid out of the so-called twist boundary face, which may lead to the apparent rotation of crystallites arround the common c-axis. Basing on some appropriate assumptions, the driving force of the crystallite rotation computed at about 1010 dyne/cm2, which is in same order as the graphitization stress.
    Finally, some attentions are focussed on the contribution of the material flow which may be respon-sible for the third stage of graphitization taking place nearby 3000°C.
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  • X-ray Study of Electrographitized Garbon Products
    III. Profiles of X-ray Diffraction
    Tokiti Noda, Isamu Natsume
    1961 Volume 1961 Issue 29 Pages 7-10
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_7
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    Lattice constants and size of graphite crystallites in electrographitized carbon products were reportedin the previous papers (This Journal, 7 (3), 79, (1959); 8 (1), 2 (1960)). However, when a carbonproduct is composed of carbons of different origins, the X-ray diffraction profile of the product shouldalso be composed of diffraction profiles of component carbons. Therefore, values of crystal size calculated from the composite diffraction profile must be different from true values.
    Experimentally several carbon brushes were found to have composite asymmetric profiles of 004diffraction. It can be seen in the figures that profiles of brushes of carbon black base, such as Superior-E 47, C-1 and C-1*, can be separated into profiles of carbons of carbon black origin and coke origin.Angles of diffraction of brushes of carbon black base seem to give an estimation of carbon black variety, even when the profiles are symmetrical. Profiles of some brushes of coke base are asymmetric, havingsmaller inclination at the low angle side than at the high angle side, suggesting admixture of smallquantity of carbon black or other less graphitizable carbons. Diffraction angles of almost all brushes ofcoke base were smaller than those of electrodes and anodes. Half intensity breadths of 004 diffractionsof these brushes were larger than those of electrodes and anodes. More detailed and quantitative investigation on diffraction profiles of mixtures of different varieties of carbons will be published in theJournal of the Chemical Society, Japan, Industrial Chemistry Edition.
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  • Experimental Study on Consumption of Artificial Graphite
    Jun Okada
    1961 Volume 1961 Issue 29 Pages 11-15
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_11
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    Evidence for the internal consumption of artificial graphites in oxidation is obtained from experimen-tal data by introducing a parameter difined by the equations (1) and (2) and plotting log δ versusoxidation time. The parameter δ changes with oxidation time according to the empirical formula (3) and δ∞ (limiting value of δ) changes with temperature (T°K) according to the empirical formula (4) or (8). A dependence of the consumption rate on the apparent density of the graphite was found ofthe type given by the empirical formula (10) where the value of n is approximately 1.6.
    Dependences of the consumption rate on the binder content and heat treatment temperature werealso measured and discussed.
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  • The micro-strength of carbon brush for mechanical abrasion Wear.
    J. Inagaki, K. Ito
    1961 Volume 1961 Issue 29 Pages 15-21
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_15
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    The mechanical wear of carbon brushes is due to the abrasion action caused by the uneven surface of commutators or slip rings. The micro strength of carbon brushes regarding mechanical wear was investigated by means of the emery paper method which was adopted to test the abrasion action of surface irregularity. The emery paper method is an experimental process designed so that the brush rubs on the emery paper, and the brush surface becomes worn with emery grains. In this way, the micro strength of carbon brushes was investigated on several different brush samples. It was concluded from our experiments that the micro-strength is proportional to the grain diameter of the carbon black in the brush and tospecific resistance of the brush, and it is inversely proportional to the macro-strength of the brush, e.g., the Shore-hardness and the breaking strength.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1961 Volume 1961 Issue 29 Pages 22-27
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_22
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  • [title in Japanese]
    [in Japanese]
    1961 Volume 1961 Issue 29 Pages 27-29
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_27
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1961 Volume 1961 Issue 29 Pages 30-37
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_30
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  • [title in Japanese]
    W. Bollmann, J. Spradborough
    1961 Volume 1961 Issue 29 Pages 38-39
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_38
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  • [title in Japanese]
    1961 Volume 1961 Issue 29 Pages 39-42
    Published: July 30, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1961.29_39
    JOURNAL FREE ACCESS
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