TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
Volume 1993, Issue 159
Displaying 1-8 of 8 articles from this issue
  • Takeo Ohte, Akira Kojima, Mizuki Mori, Sugio Otani
    1993 Volume 1993 Issue 159 Pages 177-184
    Published: October 18, 1993
    Released on J-STAGE: July 05, 2011
    JOURNAL FREE ACCESS
    Surface modification of carbon fiber by cold plasma of tetrafluoromethane was investigated.PAN-based and pitch-based carbon fibers were used. Plasma treatment was carried out by high-frequency discharge in tetrafluoromethane. The surface of carbon fiber was modified to be hydrophobic by treatment. The carbon fiber underwent heat-treatment or immersion in water, after which stability of the fluorine introduced was examined by measuring the contact angle with water, fluorine content, and estimating F/C in ESCA spectra.
    The results revealed the following three types of the fluorine introduced by plasma treatment: (1) covalent bond type, insoluble in water and stable to heat, (2) layer interstitial type, insoluble in water and unstable to heat, (3) adsorption type, spluble in water and unstable to heat.
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  • Hideto Matsuo, Fumiaki Kobayashi, Kazuhiro Sawa
    1993 Volume 1993 Issue 159 Pages 185-191
    Published: October 18, 1993
    Released on J-STAGE: July 05, 2011
    JOURNAL FREE ACCESS
    Two kinds of hot-pressed and cold-pressed boronated graphites, of which boron contents are 3wt%and 30wt%, were irradiated up to a maximum neutron fluence 2×1025n/m2 (E>29fJ) at 550-1070°Cin the JMTR (Japan Materials Testing Reactor).
    Irradiation-induced changes in length, thermal expansivity and thermal conductivity were measured after the irradiation. The changes depended on the direction measured and the fabrication method inaddition to irradiation conditions. Thermal conductivity decreased and its temperature dependence changed after the irradiation.
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  • Shinsuke Hoshii, Akira Kojima, Hirohisa Endou, Sugio Otani, Tasuku Sat ...
    1993 Volume 1993 Issue 159 Pages 192-196
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    This work was aimed at preparing carbon fiber (CF) / ceramics composites with oxidation resistance. Matrix material, diphenylborosiloxane (PBS) was prepared from diphenylsilanediol and boric acid, their mole ratio (Si/B) being 3/2. PBS with high boron content was combined with CF, and calcined at 100°C to form a composite (UD, 3mm in diameter).
    The surface of the composite was covered with a compact glassy film. According to X-ray diffractometry ingredients of the composite were carbon, β-SiC and B2O3. Thermogravimetry on this composite up to 1000°C in the air gave a weight reduction of 24%. The composite coated by a compact oxidation resistant film containing B2O3 showed a greater oxidation resistivity than that from PBS with low boron content.
    The composite was heat-treated up to the temperature of 2000°C, and its crystal structure were examined.
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  • Tadao Kaneko, Meiko Iida, Akira Kojima, Sugio Otani
    1993 Volume 1993 Issue 159 Pages 197-201
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The purpose of this study is to prepare a high strength FRM. Aluminum covering was carried out over carbon materials such as CF in order to increase their wettability to molten metals such as aluminum. A sputtering apparatus with a cylindrical target was fabricated to carry out the covering. Sputtering was caused by glow discharge between the target (aliminum cylinder) and the two anode plates attached to its top and bottom. As the substrate for priliminaly test, a thin carbon rod (lead of mechanical pencil, 0.3 mm in diameter) was used instead of CF, and the rod was placed at the central axis of the target. Aluminum coating was formed on the whole surface of the substrate. The formation rate and structure of coating were varied by controlling the electrical potential of substrate. When the substrate was electrically isolated, coating with columnar structure was formed with a formation rate of 15μm/hr. In case of grounded substrate, coating with amorphous structure was formed with a formation rate of 7μm/hr.
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  • Tadao Kaneko, Mieko Iida, Akira Kojima, Sugio Otani
    1993 Volume 1993 Issue 159 Pages 202-206
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The purpose of this study is to prepare a high-strength FRM. Aluminum covering over carbon fibers was made to increase their wettability to molten aluminum. A cylindrical sputtering apparatus was used for the covering. One tow of carbon fibers was placed along the central axis of the cylindrical target. Aluminum was uniformly coated around the carbon fiber tow. But in case of CF without sizing treatment, aluminum spread into the inside of the tow. Preforms of carbon fiber/aluminum composite were made by impregnating cabon fibers with molten aluminum. Contact angle of molten aluminum to the aluminum-coated carbon fiber was about 30°. The fractured section of preform was obserbed by SEM, which showed that molten aluminum wetted the outer part of the tow well but had not penetrated into the center, and that adhesion betwenn CF and aluminum matrix was in good condition.
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  • Hiroshi Shioyama, Kuniald Tatsumi
    1993 Volume 1993 Issue 159 Pages 207-221
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The preparation of graphite bi-intercalation compounds (GBCs) from stage-n GIC (n=2-4) is reviewed on the basis of experimental results. Twelve groups of GBCs were obtained by electrochemical, vapour phase and liquid phase methods. The c axis repeat distance Ic of the GBCs was very close to the sum of the interplanar distances of the two intercalates, measured in binary compounds. The bi-intercalation process is in competition with several kinds of other reactions such as displacement of intercalate.
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  • Michio Inagaki, Masahiko Ohira
    1993 Volume 1993 Issue 159 Pages 222-233
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The formation process of ternary graphite intercalation compounds (GICs) containingtwo metalchlorides was discussed by reviewing the experimental results on the reactions betweeen the binarymetal chloride-GICs with either stage 1 or 2structure and another metal chloride, and also on thereaction between the mixtur of these two metal chlorides and host graphite. From the results on four systems (CuCl2-FeCl3, CuCl2-NiCl2, FeCl3-NiCl2, AlCl3-FeCl3), it was concluded that threefundamental reactions for the formation of ternary GICs wereessential; 1) intercalation into un-occupied graphite gallery; 2) exchangereaction between the intercalates, and 3) de-intercalation from the graphite gallery. The interaction between two intercalates, such as the formationof gaseous complex and molten salt, was shown to be also important tounderstand the formation process of ternary GICs.
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  • [in Japanese]
    1993 Volume 1993 Issue 159 Pages 234-237
    Published: October 18, 1993
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
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