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Volume 2 (1951 - 1952･･･
- Issue 4 Pages 221-
- Issue 3 Pages 91-
- Issue 2 Pages 41-
- Issue 1 Pages 5-
Volume 2, Issue 4
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1952 Volume 2 Issue 4 Pages 221-223
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (651K) -
Hiroo Toyoda1952 Volume 2 Issue 4 Pages 224-232
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAs a study to clarify the mechanism of the electrical conductivity of carbon, the, measurements of electric resistance and thermoelectric power are reported this paper, also, involves some description of the recent works on this problem by other authors.
To trace the carbonization process, author choose the phenol-formaldehyde resin and the anthracite as starting material, They were thermally decomposed in hydrogen or other reducing gas, between 550° and 1000°C. Electric measurements were done at the-temperature range from 20° to 350°C.
The results satisfy the intrinsic semiconductive formula, the constants involved varying markedly with the temperature of heat treatment. In this considerable change, the crystallite seems to play the more decisive role than the crystallite boundary. This model. explains some other experiments quoted here.View full abstractDownload PDF (1818K) -
Tetsuro Akanuma1952 Volume 2 Issue 4 Pages 232-235
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon brush block is a product of powder material pressed into form and burnt. Naturally it is not perfectly homogeneous but considerably heterogeneous. Investigation should be made therefore into the degree of heterogeneity and the possible regularity governing the heterogeneity. Experimental results show that the upper surface of the same piece of block has higher values of Young's modulus and tensile strength than the lower one; the edges give higher values of these than the centre; in Young's modulus the sides are superior to the pressed surfaces, while in tensile strength, the former is inferior to the latter.
If these facts are fully studied, the results will contribute to the clarification of the inner structure of carbon brush block.View full abstractDownload PDF (769K) -
Tadayoshi Tanaka, Jun Okada1952 Volume 2 Issue 4 Pages 236-237
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSElectric conductivities of carbon and artificial graphite were measured by the electric potential drop method, and thermal conductivities were measured by the Kohlrausch's method.
As the result, it was found that there was some definite relationship between the electric conductivity and the thermal conductivity of the artificial graphite. It was shown in Fig. 1 as K-σ curve of graphitized carbon.
The relationship between the both characteristics of carbon in graphitizing process was shown in Fig. 2· The characteristics of sufficiently graphitized carbon by heating up to higher temperature were plotted on this K-σ curve.View full abstractDownload PDF (353K) -
Sei Sengoku, Kimio Ito, Toshio Furusawa1952 Volume 2 Issue 4 Pages 238-239
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSComposition carbon resistors were made using 18 kinds of carbon blacks of various manufacturing processes as raw conductive materials and phenol resins as binders on a definite condition, and their voltage coefficients and noises were estimated. Comparing those results with the chemical and physical properties of carbon blacks used, following facts were convinced. Carbon blacks of smaller particle sizes and of better uniformity inparticle sizes are more suitable for resistors from the view points of those properties, almost without connection with their chemical properties. An acetylene black showed an exceptional case in spite of its smaller size and better uniformity, but the reasons were not made clear.View full abstractDownload PDF (379K) -
Mainly on the measurement of the degree of graphitisationShigeru Yamaguchi, Toshio Noguchi, Saburo Hatta, Mitsuo Hino1952 Volume 2 Issue 4 Pages 239-244
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSPetroleum coke, pitch coke, charcoal, acetylene black and anthracite were exposed to heat treatment, and their degrees of graphitisation were estimated by specific gravity measurement, graphitic acid analysis and X-ray particle size determination. These values were mutually compared, and correlations were calculated.
The specific gravity value is greatly influenced by the kind of raw material, but the rate of its increase has rather good mutual relation to the graphitic acid analysis value and the height of orienteted graphite layers (calculated from the (hkl) line breadth). Their coefficients of correlation are 0.90 and 0.82 respectively. The graphitic acid analysis value and the height of orienteted graphite layers are also combined with the coefficient 0.89.View full abstractDownload PDF (1038K) -
Tomoyuki Somiya1952 Volume 2 Issue 4 Pages 245-247
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
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H.L. Riley1952 Volume 2 Issue 4 Pages 248-254
Published: July 30, 1952
Released on J-STAGE: March 01, 2011
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[in Japanese]1952 Volume 2 Issue 4 Pages 255-261
Published: July 30, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1614K)
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