TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
Volume 1966, Issue 46
Displaying 1-5 of 5 articles from this issue
  • I-Some Studies on Hardening, Carbonization and Graphitization of A-F Resin
    H. Honda, Y. Sanada, T. Furuta, H. Teranishi
    1966 Volume 1966 Issue 46 Pages 2-9
    Published: September 10, 1966
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    It seems that the hardening reaction of acetone-furfural resin (A-F resin) is a condensation polymerization eliminating water, receiving more or less oxidation. The carbonization reaction of A-F resin is mainly dehydration up to HTT about 250®C In the range between HTT about 250®C and HTT about 500®C dehydration is combined with decarbonylation and decarboxylation. Dehydrogenation predominates above HTT about 500®C with demethanation.
    The variation of specific density against HTT shows that Vitro Carbon (A-F resin carbon) is a typical non-graphitizing carbon. The aromaticity and the ring condensation of Vitro Carbon below HTT 1000®C were deduced by the graphical densimetric method of van Krevelen. The aromaticity increases with HTT and reaches a maximum value of unity at HTT about 600®C. The ring condensation index increases above HTT about 500®C and reaches 0.85 at HTT 1000®C.
    Download PDF (1079K)
  • Junichi Kon, Masayuki Katase, Kenjiro Murata, Amane Ishihara
    1966 Volume 1966 Issue 46 Pages 10-15
    Published: September 10, 1966
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Further studies of the in-vacuum Young's modulus as a function of temperature ranging from room temperature up to 1000®C have been examined on various artificial and natural graphites. The modulus (E) vs. temperature (T) relationship when temperature is elevated up has been found to satisfy the following empirical formular;
    ET/E50=a+bT+cT2,
    where E50 denotes the modulus at 50®C. The minimum value of Young's modulus for porous graphites is indicated at about 400®C, while that for dense specimens appears around 250®C. Also in the increasing rate of modulus, the porous ones definitely predominate the dense ones. As to the effect of heat treatment temperature (HT), the characteristic hysteresis in the E vs. T curve tends to diminish with decreasing HT. The coefficient c in the above formular is found to increase as HT is elevated. The temperature dependency of E for natural graphite compacts is strongly affected by the apparent density as well as by the presence of binder materials.
    Download PDF (629K)
  • On the trial electrostatic decomposition method
    [in Japanese]
    1966 Volume 1966 Issue 46 Pages 16-23
    Published: September 10, 1966
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Recently, the physical mechanisms of the vacuum deposition method have achieved far more progress than that of the pyrolytic cracking method.
    The thermal cracked carbon film resistors are going to be deprived of their position by those new film resistors such as metals, oxide-metals and nitrogen-metals which are produced by the so-called vacuum deposition method.
    This report is concerned in the first place, with the influence that the manufacturing conditions of thermalcracked carbon film resistors gives to their constructions and characteristics, as observed as the result of the writer's experiments.
    In the second place is introdued the manufacturing method of the cracked carbon films in the electrostatic field, and the characteristics of the film resistors obtained.
    Download PDF (3849K)
  • K. Takeya, T. Okuo
    1966 Volume 1966 Issue 46 Pages 24-31
    Published: September 10, 1966
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The radioactivation analysis by proton bombardment has been examined on the nitrogen-doped pyrolytic graphites which were prepared through the pyrolysis of pyridine at 2000°C under the pressure of a few milimeter mercury. Long slab test pieces with the dimension of 22mm×12mm each were cut out and exposed to the proton irradiation of 25 MeV-5μA for ten minutes, which led to the nuclear reaction of 14N (pα) C11.
    The excitation function was measured by the so-called stacked-foil method. It has been found that the presence of 1ppm nitrogen in graphite gives rise to the saturation activity (thick target) of 5.3×103 dpm by 11C after the proton irradiation of 15MeV-5μA. The nitrogen concentration was observed to vary from a few ppm up to several hundreds ppm as a function of depsite and annealing temperatures. X-ray diffraction works examined at the same time verifies that the layer spacing is independent of the nitrogen contetent.
    Download PDF (781K)
  • [in Japanese]
    1966 Volume 1966 Issue 46 Pages 32-41
    Published: September 10, 1966
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Download PDF (1901K)
feedback
Top