TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1982, Issue 111
Displaying 1-6 of 6 articles from this issue
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  • Effect of Hot-pressing Pressure on Some Properties of Polycrystalline Graphite made from Coke Powder with addition of Boron Carbide
    Kenji Miyazaki, Tsuyoshi Hagio, Kazuo Kobayashi
    1982 Volume 1982 Issue 111 Pages 141-148
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.141
    JOURNAL FREE ACCESS
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    Polycrystalline graphites were made from a calcined pitch coke powder with boron carbide (B4C) additive in amounts varying from0to16.7wt% by hot-pressing at 2200°C under various pressures from 20 to 400 kg/cm2. The effect of hot-pressing pressure was investigated on some properties such as density, bending strength, electrical resistivity, graphitization degree and oxidation behaviour of the hot-pressed solids.
    It was found that the density and bending strength of the hot-pressed solids increased remarkably with increasing hot-pressing pressure. The obtained values were, however, depended on the content of B4C additive;that is, in the cases of4.8wt% and16.7wt% B4C additions, the bending strength was about900kg/cm2 and about1400kg/cm2 respectively for solids made at a maximum pressure of400kg/cm2.
    Electrical resistivity decreased with the increase of hot-pressing pressure and was abou 0.5-0.6×10-3 ohm-cm for all the hot-pressed solids with B4C additive made at400kg/cm2.
    The d (002) spacings of the hot-pressed solids expanded slightly and three dimensional disordering of graphite structure occurred with the increase of hot-pressing pressure.Their graphitization degree, however, progressed much more than those for the solids without B4C additive. The degradation behaviour of graphite structure is thought to be due to boron diffusion and its interstitial occupation between layers in addition to substitutional positions.
    All the hot-pressed solids made with B4C additive showed excellent resistance against air oxidation and H2SO4-HNO3acid solution, compared with those of solids without B4C additive and some conventional graphites.
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  • Fourier Transform Infrared Spectra of Activated Carbons
    Hisayoshi Yoshida, Yoshio Adachi, Katsumi Kamegawa
    1982 Volume 1982 Issue 111 Pages 149-153
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.149
    JOURNAL FREE ACCESS
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    Fourier transform infrared spectroscopy (FT-IR) was applied to the study of the chemical surface structures of activated carbons and the carbons oxidized with air (400°C, 3hr) and nitric acid (3N HNO3, 100°C, 2hr).A FT-IR instrument used in this study is Digilab FTS-20C/D.KBr pellets of the carbons were prepared at a concentration of about 0.1 wt% and dried at 65°C for 3hr in vacuo.IR spectra were obtained by accumulating 800 scans (interferograms) at a resolution of 4 cm-1.
    The activated carbon prepared from wood by ZnCl2 activation method gave the aliphatic (alicyclic) C-H bands at 2960, 2920, 2860, 1450 and 1380 cm-1, the aromatic C-H bands at 3060, 870, 820 and 760 cm-1, the aromatic nucleus band at 1590 cm-1, and the carboxyl group bands at 1710 and 1260 cm-1.When the carbon was treated with KOH or Ca (OH) 2 aqueous solution, the band at 1710 cm-1 disappeared and the new band at 1400 cm-1 appeared, demonstrating that a carboxyl group (COOH) was converted into an ionized carboxyl group (COO-).It is, therefore, clear that carboxyl groups are present on activated carbon as surface acidic oxides.
    The activated carbons prepared from wood, coconut shell and coal by a steam activation method gave the aromatic nucleus band at 1590 cm-1 and the carboxyl group band at 1710 cm-1.The hydrogen contents of these carbons are so small that the absorption bands due to C-H bonds scarcely appeared.The band intensity at 1710 cm-1 was increased by oxidation of the carbon with air or nitric acid, indicating that the carboxyl groups were formed on the carbon by oxidation.
    It was very difficult in the past to obtain the IR spectra of activated carbons.The high resolution IR spectra of activated carbons were obtained by the use of FT-IR as shown in this paper.FT-IR is considered to be a very useful technique in the studies of chemical structures of carbons.
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  • Test-results on Utilization of Carbon-Glass Fiber Composite as a Surface Heater (IV)
    Michio Horie
    1982 Volume 1982 Issue 111 Pages 154-156
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.154
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  • Oxidation of Raw Petroleum Coke by Grinding
    Hisayoshi Yoshida, Ichitaro Ogawa, Yoshio Adachi, Kazuo Kobayashi
    1982 Volume 1982 Issue 111 Pages 157-159
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.157
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  • [title in Japanese]
    [in Japanese]
    1982 Volume 1982 Issue 111 Pages 160-170
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.160
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1982 Volume 1982 Issue 111 Pages 171-178
    Published: October 30, 1982
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1982.171
    JOURNAL FREE ACCESS
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