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Volume 1963 (1963)
- Issue 36 Pages 2-
- Issue 35 Pages 2-
- Issue 34 Pages 2-
Volume 1963, Issue 35
Displaying 1-6 of 6 articles from this issue
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Yasugoro Tsunoda1963 Volume 1963 Issue 35 Pages 2-8
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSOxygen consumptions of twelve coal tar pitches variing their characteristics for artificial electrode were studied at 240°C. Pitches were put in sealed ampoules with sufficient air for oxydation and heated in an electric thermostat. The oxygen consumed with pitch was determined by analysis of the gas after reaction in the ampoule with a gaschromatograph with a column of active charcoal.
All of pitches consumed above 3×10 mol of oxygen per unit gram of pitches. The relation between the characteristics of pitchs and their oxygen consumptions was not distinctly observed. Therefore the reactivity of pitch with oxygen may be depend upon the origin of raw coal and the manufacturing process.
The coking values of typical hard and soft pitches after oxydation were also measured and it was confirmed that oxygen in air promoted the condensation polymerization of pitches and increased their coking values from initial 51 and 45 to 67 and 69, respectivily.View full abstractDownload PDF (901K) -
Kinjiro Ito, Riichi Ano1963 Volume 1963 Issue 35 Pages 8-14
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWhen operation of electric machines, current flowing through their carbon brushes is not always uniform, and the heavy loaded brush is apt to be destrayed. A non uniform current distribution may be caused by the quality of electrographitic brushes.
The current distribution factor are compared with gas Permeability of carbon materials, then a closerelation between them is found.
The method of experiments and results shall be shown in this report.View full abstractDownload PDF (1473K) -
Kotaro Higashi, Yusai Ishio1963 Volume 1963 Issue 35 Pages 14-19
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWhen selecting a brush grade compatible with reactive gas atmosphere, there are many aspects thatmust be considered. We studied the effects of ambient gas (Cl2, SO2, H2S) on brush-Cu slip ring contact. Resalts obtained are as follows.
(1) When a highly concentrated Chlorine gas-air mixture was passed by brush slip ring contact, the contact voltage drop of positive brush (motor notation) increased rapidly, while the contact voltagedrop of negative brush decreased gradually and the negative brushes started to pick up copper withinabout an honr.
(2) Considering the effect of brush grade on the result of above experiment, it isdesirable to applynatural graphite grade or coke type electrographite grade brush in chlorine gas atmosphere.
(3) It seems that chlorine attacks copper slip ring, forms heavy porous film on slip ring, and thefilm absorbs water vapour.
(4) It is concluded that the anomalous change of the contact voltage drop of positive brush in the presense of chlorine gas is due to the film formation on ring, and the copper picking of negative brush is owing to the electrolytic phenomena on brush slip ring contact.
(5) The behauiour of brush slip ring contact characteristics in sulphur dioxde or hydrogen sulphide atmosphere, looks alike to that of chlorine, but it should be noted that the effects of brush grade on the brush slip ring contact are not clear.View full abstractDownload PDF (890K) -
[in Japanese]1963 Volume 1963 Issue 35 Pages 20-26
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1155K) -
[in Japanese]1963 Volume 1963 Issue 35 Pages 27-34
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1231K) -
[in Japanese]1963 Volume 1963 Issue 35 Pages 35-38
Published: August 30, 1963
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (740K)
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