TANSO

Catalytic Graphitization of Carbon by Clay Minerals

Asao OYA, Hirokazu HANAOKA, Sugio OTANI

1975 Volume 1975 Issue 81 Pages 49-55
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.49

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In order to clarify whether carbon products deposited on smoked tiles are catalytically graphitized in the manufacturing process, some clay minerals and related substances were examined on their abilities to promote catalytic graphitization. These compounds were added by 20 w/o into carbon black and carbon powders derived from phenol formaldehyde resin, followed by heat-treatment at various temperatures from 900°C to 2200°C under nitrogen gas.
The catalytic graphitization was observed more remarkably in phenolic resin carbon than in carbon black. The phenolic resin carbons containing the clay minerals were catalytically graphitized in the two stages which were observed at 1200-1500°C and at 2200°C respectively. The catalytic effect was slightly detectable in the first stage but remarkably pronounced in the second stage, while it was not observed at all in the temperature range below 1200°C. On the other hand, the carbon product deposited on the surface of smoked tile exhibited the same appearance as that of the isotropic pyrolytic carbon produced at a low temperature, and its crystallite thickness was estimated to be only 18Å. From these results and the fact that the smoked tile is generally manufactured at temperatures below 1000°C, it was concluded that carbon on the smoked tile is not subject to the catalytic graphitization at the temperature range used in the manufacturing process.

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Effects of Neutron-Irradiation and Isochronal Annealing on the Galvanomagnetic Properties of Natural Grapllite Compact

Kiyoshi KAWAMURA, Takuro TSUZUKU

1975 Volume 1975 Issue 81 Pages 56-57
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.56

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Graphitization of Coke Investigated with Magnetoresistance Technique

Yutaka KABURAGI, Akio ONO, Yoshihiro HISHIYAMA

1975 Volume 1975 Issue 81 Pages 58-59
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.58

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[title in Japanese]

[in Japanese]

1975 Volume 1975 Issue 81 Pages 60-67
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.60

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Structural Changes of Graphitizing Carbons during Graphitization^*1-Review

M. Inagaki, A. Oberlin, T. Noda

1975 Volume 1975 Issue 81 Pages 68-72
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.68

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The correspondencies among many published data of various experiments on graphitizing carbons are discussed as a function of interlayer spacing. Many data considered here are consistent with a model in which the graphite-like layers in the cokes with d₀₀₂>3.42Å consist of small elemental domains which are of 10-30Å in diameter and tilt by an angle of roughly 10° with their neighbors. The main change at the initial stage of graphitization (>3.42Å and<1900-2000°C) is the elimination of tilt and twist boundaries between the elemental domains in a layer and also of tilt boundaries between the layers. After straightening of layers (<3.42Å), the elimination of α-axis misorientation between domains occurs in the straightened layers and consequently the stacking misorientation between layers is eliminated.

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[title in Japanese]

[in Japanese]

1975 Volume 1975 Issue 81 Pages 73-79
Published: April 30, 1975
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1975.73

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