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Volume 1966 (1966)
- Issue 47 Pages 2-
- Issue 46 Pages 2-
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Volume 1966, Issue 47
Displaying 1-5 of 5 articles from this issue
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Yasugoro Tsunoda, Muneyoshi Kurosaki, Sakae Ikegami1966 Volume 1966 Issue 47 Pages 2-7
Published: November 30, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSPlasticity and thermal analysis of some pitches were examined up to the temperature of coking with Gieseler plastometer which is used for the study of coking reaction of coals.
The pitches studied absorbed considerable heat of coking from about 440°C, suddenly increased their plasticity at 480-500°C, temporarily ceased the increase of plasticity at 490-510°C, and finally changed to solid state from about 510°C.
The temperature of coking was also certified by differential thermal analysis.
The differences among the sample pitches were compared in detail, and the heat of coking reaction of each pitch was calculated from D.T.A. data.View full abstractDownload PDF (805K) -
II-X-ray Diffraction and ESR of Vitro CarbonH. Honda, S. Toyoda, K. Kobayashi, S. Sugawara, H. Teranishi1966 Volume 1966 Issue 47 Pages 8-14
Published: November 30, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe X-ray analysis shows that Vitro Carbon is a typical non-graphitizing carbon. The crystallite spacing, d (002) and d (110) , the crystallite thickness, J.c (110) and the crystallite size, I, a (110) change stepwisely with heat treatment temperature (HTT). The value of La (110) is almost constant over the range of HTT about 1000-1500°C, increases with HT over the HTT range of about 1500-2000°C, is almost constant again over the HTT range of about 2000-2500°C, and increases suddenly with HT above about 2500°C.
The ESR signal for Vitro Carbons in vacuum shows the presence of a new narrow component and a broad component in the HTT range about 2000-2600°C. The g-value for the narrow component is almost equal to that of free spin all over the HTT range but the g-value for the broad component is different from that of free spin above HTT about 2500°C. The ESR signal of Vitro Carbons in the HTT range of about 500-1000°C is oxygen sensitive and that of Vitro Carbons in the HTT range of about 1300-1800°C and HTT 3000°C is oxygen insensitive. In the HTT range of about 2000-2600°C, the narrow component is oxygen sensitive and the broad component is oxygen insensitive. Therefore, it seems that the narrow component is attributable to the localized spin centers produced by the edge defects of graphite layers having three-dimensional twisted stacking, and that the broad component is attributable to the unlocalized spin centers originated in the charge carriers.View full abstractDownload PDF (979K) -
T. Noda, M. Iwatsuki, M. Inagaki1966 Volume 1966 Issue 47 Pages 14-23
Published: November 30, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe probability of nearest neighbour layers having the graphite relation (P1) and the probabilities of second neighbour layers being in the ABA sequence (PABA) and in the ABC sequence (PABC) were determined for the heat-treated samples of a petroleum coke, a thermal black and a channel black. The profiles of (10) and (11) diffraction lines were measured by using Ni-filtered Cu Kα radiation. A propotional counter furnished with a puls-heights analyser was used to cut off the white ray component. The observed profiles were corrected for instrumental broadening by the Stokes' method, for low absorption effect by the method of Keating and Warren, and for Lorentz polarization and scattering factors. An electronic computor was used for the corrections and also for the calculations of Fourier coefficients.
Observed values of P1 and a3 (=co/2) were very well represented by the Warren's relation, that is,
a3=P1·a3+ (1-P1) ·a'3 (1)
where a3= 3.354 and a'3=3.44Å.
According to Maire and Mering,
Pn=gn+1 (2)
where Pn is the probabilty of n-th neighbour layers being ordered in the graphite relation and
a3=g·a3+ (1-g) ·a'3·
They verified experimentally,
P1=g2 (3)
From Eq.(1), on the other hand, one can obtain,
P1=g (4)
In the present experiment, Eq.(4) was verified. For P2, however, the equivalent relation to Eq.(2) (P2=g3) was obtained. In order to discuss on these relations in more detail, the further experimental works are needed.
The probabilities PABA and PABC were almost equal in the range of p1≤0.8. Above that value of P1, PABA increased rapidly, while PABC remained as unchanged at a value of 0.23 or PABC/P1=0.3. The latter relation corresponds to a reported value (33%) for the concentration of rhombohedral modification in the well-pulverized natural graphite.View full abstractDownload PDF (1388K) -
I-Electro-Discharging Properties in Air and Physical Properties of CarbonsH. Honda, Y. Sanada, S. Harazaki, K. Sugai1966 Volume 1966 Issue 47 Pages 23-29
Published: November 30, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe electro-discharging tests in air under repeating, continuous and impulsive discharges have been examined respectively on the carbon electrode made of the commercial carbon brush materials. Although the photomicrographs of the carbon electrode exposed to the stable discharge show a rather smooth fine surface, those of the carbon electrode exposed to the unstable discharge show an uneven rough surface and large craters.
The larger the electric conductivity, the flexibility (flexural strength/Young's modulus), and the thermal shock resitivity (thermal conductivity x flexural strength/Young's modulus x thermal expansion coefficient) of the carbon electrode are, the smaller the consumption rate due to continuous discharge, the voltage change and the degree of stiort-circuit due to impusive discharge.
It seems that the above mentioned physical properties of carbon electrode do not contribute separately but in combined form to the electro-discharging properties. These relations are discussed by using the dimensional analysis and the consumption resitivity has been deduced from thermal eqilibrium equation assuming that the consumption of electrode is due to only the thermal effect of electric discharge. The larger the consumption resitivity of carbon electrode is the smaller the consumtion rate due to continuous discharge and the degree of short-circuit due to impulsive discharge.View full abstractDownload PDF (3325K) -
[in Japanese]1966 Volume 1966 Issue 47 Pages 30-34
Published: November 30, 1966
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (823K)
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