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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 1
Displaying 1-8 of 8 articles from this issue
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Hisao Hirabayashi, Hiroo Toyoda1954 Volume 4 Issue 1 Pages 2-8
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon powder baked from phenol-formaldehyde resin at 1200°C, was oxidized in air between 200-900°C. Contact resistance, alkali, humidity and methylene-blue adsorptions show maxima at 500-500°C. By thermal decomposition of the oxidized carbon, humidity and methyleneblue adsorptions do not change, but on the other hand, contact resistance and alkali adsorption diminish, followed by the gas evolution, thereby some functional relation exists among them. From these, the resistance increase by oxidation may be regarded as mainly due to the surface oxide formation.View full abstractDownload PDF (3556K) -
Tatsuo Matsukawa1954 Volume 4 Issue 1 Pages 9-12
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMetal-graphite alloys have many superior properties which are not possessed by other metallic alloys, i.e. lubrication, refractoriness and porosity of graphite; strength, handness and good conductivities of heat and electricity.
The typical examples of these composite are as follows:
Self-lubricating Bearing Metals (graphite 1-3%)
Copper-base alloys and Iron-base alloys.
Pantograph Slide (graphite 2-5%)
Sintered Steel (graphite 0.5-4%)
Friction Products (graphite 5-10%)
Electrical Contacts (graphite 5-50%)
Lower graphite product (graphite below 10%) and Higher graphite products (graphite 20-50%)
Metallic-Carbon Brushes (graphite 10-50%)
The above alloys are manufactured by sintering process. Brief descriptions of the alloys are given.View full abstractDownload PDF (945K) -
Tadayoshi Tanaka, Jun Okada, Tatsuo Ikegawa1954 Volume 4 Issue 1 Pages 12-16
Published: April 15, 1954
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe combustion rate of artificial graphites, which are self-heated from 700°C up to 2000°C in 1 atm. air of room temperature, were measured. The specimens were heated up to 2000°C in 1 atm. air by passing the electric current throngh the specimens.
The typical curves among the many similar curves measured as to several grades of the artificial graphites were indicated in Figure 6.
The results were discussed in reference to the literatures of A. C. Riddiford, Tu and H. Honda ete.View full abstractDownload PDF (1008K) -
Characteristics of an ashless natural flake graphite and deviation of density of the graphite by pycnometer method using different immersion liquidsGenkichi Ichinose, Masaichi Kawasaki1954 Volume 4 Issue 1 Pages 16-18
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA natural flake graphite, “CB-150”, ash content 1.43%, treated with HF and heated to 2600°C. Its ash content became zero by chemical analysis, trace of B, however, detected yet by spectral analysis.
The graphites, original and treated, did not altered their crystal lattice constants, similar to the values previously reported by Bacon and other authors. Densities of the grahites by pycnometer method with C6H6, however, observed too high, as 2.29, while as 2.26 with C Cl4.
Heating temperature-oxydation loss curves of the graphites by thermobalance method were also obtained. Their shapes had been altered to steeper formes by decreasing ash contents of the qraqhite. The shape of the curve of pure graphite quite resembled to a highly graphitised soot brush.View full abstractDownload PDF (693K) -
Tetsuo Yamaguchi1954 Volume 4 Issue 1 Pages 19-24
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThermal expansion of various carbons brerared at 1200°C or graphitized, have been measured over the temperature range frome room temperature (20°C) to about 600°C by using a dilatometer, shown in Fig 1.
The mean thermal expansion coefficient “α” of various carbons are found to differ largely with each other in its kind. Some of these as anthracite and Ceylon graphite was anisotropic in α. Particulary, pitch coke which is anisotropic in its bubble pore and is heated at 1200°C or graphitized, and anthracite which is graphitized, have showed a “negative α”, up to certain temperature along its layer direction. A specimen, molded with mixed powder of Ceylon graphite and pitch, showed also a negative α in a direction perpendicular to the molding pressure. Expansion of most carbons and contraction of anisotropic pitch cokes with increasing temperature is seen in Fig 2. The α values of these specimens showed a linear increase with increasing temperature in these temperature range as is seen in Fig 3. The coefficient of the temperature dependence of α was 1.8×10-9 for petroleum or pitch cokes and this is not affected whether it is block of raw material or formed article and it is graphitized or not. Other carbons such as metallurgical coke have different cofficient of thermal dependence of α respectively.View full abstractDownload PDF (1282K) -
II Effect of the baking temperature of the electrodesTakashi Mukaibo, Masayuki Sato1954 Volume 4 Issue 1 Pages 25-29
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFollowing the first paper, we examined the consumption of carbon anodes baked at various temperatures in the electrolysis of caustic soda and sulphric acid. It was found that the remarkable change of consumption occurred at the baking temperature between 1500 and 1900°C, and the electrodes baked below 1500°C resembled each other in one side, and those baked above 1900°C, and of the artificial graphite resembled each other in another side.
It was found also that the effect of SO4= was very weak in the concentrated alkaline solutions, and that in dilute alkaline solution the effect of SO4= appeared and the consumption of the electrodes increased.View full abstractDownload PDF (762K) -
[in Japanese]1954 Volume 4 Issue 1 Pages 30-37
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1297K) -
[in Japanese]1954 Volume 4 Issue 1 Pages 38-41
Published: April 15, 1954
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (992K)
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