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Volume 4 (1954)
- Issue 4 Pages 134-
- Issue 3 Pages 94-
- Issue 2 Pages 47-
- Issue 1 Pages 2-
Volume 4, Issue 4
Displaying 1-8 of 8 articles from this issue
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Takashi Mukaibo, Masayuki Sato1954 Volume 4 Issue 4 Pages 134-140
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIn this report we compared consumption of three groups ot graphite eiectroaes, each consisting of three or four plates. We measured ratio of current used for consumption of carbon, total weight loss and ratio of sludge to consumption, by oxidation.
The main difference between Acheson graphite and Jaban's graphite consists not in consumption by oxidation but in the ratio, of sludge to that, and according to small value of this ratio, about 0.2, Acheson graphite gives relatively small value of total consumption.View full abstractDownload PDF (906K) -
Toshikatsu Ishikawa, Kenji Ikeda1954 Volume 4 Issue 4 Pages 140-144
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSPitch Cokes carbonized from coal tar pitch (c, and c2) during 600-900°C and Great Lake petroleum coke are grinded by the steel ball mill. Surface areas of these grinded particles are measured by the permeability method (Fig 2 and Fig 3). The Energy-New Surface relationship for these grinded particles indicate a convex (ds/de>0) curve over the range studied (E-S curve of Fig 4.). The relationship between the coking temperature of coal tar pitch and new surface produced are shown over the range of energy input studied (Fig. 5). There is a tendency for the amount of new surface produced (cm2/gr) to decrease gradually during 600-800°C and then to increase slightly during 800-900°C.View full abstractDownload PDF (1202K) -
Tetsuro Akanuma, Masahiro Kumagai1954 Volume 4 Issue 4 Pages 144-153
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSRecently occurrence of failures and side wears in carbon brushes for main motors on electric ears or locomotives has been substantially cut.
Since 1946 the Authors have been engaged in the study for failure prevention and collection of basic design data for a failure-proof carbon brush and in 1951 set about its tentative production after careful examination of collected data.
Main points of basic data obtained are:
1) With the Kowanishi-made pitch coke as material, the highest mechanical properties can be secured.
2) As a binder a 3 to 7 blending of tar and pitch will give better results if -added to the extent of 30-35 % besides the main constituent.
3) Pressing under 120°C heat is recommendable.
4) Use of a certain chemical to retain as much residual coke as possible will increase the amount of fixed carbon, thus producing a strong brush.
5) Optimum forming pressure is 1.24, 5 t/cm2.
6) Brush block should be shaped thin and large for better results.
7) To ensure uniformity of production, a special operation should be made in blending and (nixing under heat.
These are the results of a statistical analysis utilizing hyper greco-latin square (design of experiment) of the 32 products of Tentative A (formed thin) and B (formed thick) Tentative A-14 turned out to be the best in both characteristic and service test.
This product has the following features:
1) The conventional limit of impact 'resistance (by the impact tester) has been 60 hours. That of this one is in the range of 120-150 hrs with no failures.
2) Layer structure is hardly observed, thus a slight or no characteristic difference between pressed and lateral surface.
3) It has a large tensile strength which is highly related with failure and side wear.
4) Almost no failure nor side wear occurred in the service test, with satisfactory characteristic of wearing and commutation.
Before proceeding to a mass production, however, there is room for further study.View full abstractDownload PDF (4454K) -
Various Properties of Acetylene Blacks in Dry CellGen-ichi Yamauchi1954 Volume 4 Issue 4 Pages 153-163
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSRecently acetylene blacks are largely used in rubbers, inks, and dry cells etc. and especially the use in dry cells as addition to graphite or substitutes for it is rapidly increasing owing to their special properties. Therefore, a series of studies on acetylene blacks produced by way of experiments has been made, in order to establish a foundamental concept and make further development of battery blacks . It has been founded that the valuable properties of acetylene black in dry cell, i. e. the high liquid adsorption, the high electrical conductivity, the small ultimate particle size and the high degree of chainlike structure correspond to their low apparent densities, therefore, a better understanding of their properties can be obtained in comparing the apparent densities of a series of acetylene blacks produced by the same method.
It will be concluded that the most important requirements for the superior battery black are its small particle size and long chain structure rather than its high degree of graphitization.View full abstractDownload PDF (1840K) -
Anodic Consumption of Carbon. Electrodes with 1% H2So4 and 1 N-Na2SO4Genkichi Ichinose, Masaichi Kawasaki1954 Volume 4 Issue 4 Pages 163-165
Published: May 01, 1955
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSAnodic consumption of carbon electrodes were studied with 1% H2SO4 and 1 N-Na2SO4 by the method which had been reported by us.
With both electrolytes, higher baking temperature of the electrodes diminish their consumption.
Lower temperature baked electrodes damaged easily with 1% H2SO4 and evidently with 1 N-Na2SO4.Graphitized electrodes, their baking temperature is sensitive to anodic consumption With 1% H2SO4 and more with 1N-Na2SO4.View full abstractDownload PDF (479K) -
[in Japanese]1954 Volume 4 Issue 4 Pages 166-169
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (1146K) -
[in Japanese]1954 Volume 4 Issue 4 Pages 169-170
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (612K) -
J. M. Reynolds, H. W. Wernstreet, T. E. Leinhardt1954 Volume 4 Issue 4 Pages 171-174
Published: May 01, 1955
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (3850K)
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