TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1977, Issue 91
Displaying 1-5 of 5 articles from this issue
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  • Polycrystalline Graphite made from Coke Powder in addition of Boron Carbide (1)
    Effect of hot-pressing temperature
    Kenji Miyazaki, Kazuo Kobayashi, Hidemasa Honda
    1977 Volume 1977 Issue 91 Pages 121-128
    Published: October 30, 1977
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1977.121
    JOURNAL FREE ACCESS
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    Polycrystalline graphite compacts were made from calcined pitch coke powder with boron carbide of 4.8wt% by hot-pressing at variou temperatures from 1400 to 2200°C under a pressure of 200kg/cm2.Effect of boron carbide and hot-pressing temperature on some propertiesof the compacts were investigated by comparing the ones made from the coke powder with no addition under the same conditions. As the results, with boron carbide, density, mechanical strength and graphitization degree of the compact were remarkably increased above about 2000°C, and at 2200°C the compact with bending strength of 200-300kg/cm2, relative density of 89%, d (002) spacing of 3.358 Å and electric resistivity of about 1×10-3Ω-cm was obtained.
    It was known that boron carbide addition has remarkable influence for acceleration of both densification and graphitization of coke above about 2000°C under the pressure.
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  • Study on the Residual Strain Associated with Compressive Stress Applied to Nuclear Graphites
    Tamotsu Saito, Tatsuo Oku
    1977 Volume 1977 Issue 91 Pages 129-133
    Published: October 30, 1977
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1977.129
    JOURNAL FREE ACCESS
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    Constituent elements of the compressive residual strain have been examined taking account of results of deformation within grist particles, deformation of pores, and crack formation which are produced after applying compressive stress to nuclear graphites. Longitudinaland transverse residual strains associated with compressive prestress have been precisely measured at room temperature both foranisotropic and isotropic nuclear graphites. The apparent volume of specimen and the Young's modulus measured by ultrasonic method decreased in approximately proportion to the increase in the longitudinal residual strain. The transverse residual strain was an order of magnitude smaller than the longitudinal one.
    The deformation within grist particles was estimated to be within the limit of detection by the X-ray analysis of layer spacing and lattice strain after prestressing.These results suggest that the decrease in the apparent volume associated with increase in the compressive prestress is mainly due to the decrease in the total porosity in which the pore deformation plays an important role.The formation of crack which is taken to be a primary cause of the decrease in the Young's modulus is considered to be an element which gives a large contribution to the residual strain, together with the deformation of pores.
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  • The Effect of Heat-treatment Temperature on the Amount of Thermally Stable Turbostratic Carbon Prepared by Catalytic Actionof Nickel
    Sugio Otani, Asao Oya, Hiroya Kakegawa
    1977 Volume 1977 Issue 91 Pages 134-135
    Published: October 30, 1977
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1977.134
    JOURNAL FREE ACCESS
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  • Graphitization of Glassy Carbon/Glassy Carbon Composite
    Hidehiko Tanaka, Shiushichi Kimura, Koshi Tamada, Michio Inagaki
    1977 Volume 1977 Issue 91 Pages 136-137
    Published: October 30, 1977
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1977.136
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1977 Volume 1977 Issue 91 Pages 138-144
    Published: October 30, 1977
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1977.138
    JOURNAL FREE ACCESS
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