TANSO

Direct Preparation of Carbon Solids from Green Coke pulverized by Vibratory-Ball-Mill

Ichitaro Ogawa, Tsuyoshi Hagio, Hisayoshi Yoshida, Kazuo Kobayashi

1982 Volume 1982 Issue 109 Pages 41-45
Published: April 30, 1982
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1982.41

JOURNAL FREE ACCESS

Show abstractHide abstract

Carbon solids were directly prepared from green petroleum coke powder without using any binder material.
Green petroleum coke powder was milled with a vibratory-ball-mill for various periods from30min to8hr in addition with water of8vol% and then pressed into a cylindrical shape with diameter of20mm under a pressure of2000kg/cm².The formed samples were heat-treated at 1000°C and then to final temperature at 2800°C.
Particle size decreased to about 1μm within4hr-milling.By milling for longer period, secondary aggregated particles with about10μm in maximum size were formed. The pulverized particles were not uniform in size and shape as was observed in the case of motar grinding.(002) diffraction peak of the green coke became broader after milling.
Some properties of the carbon solids thus obtained were investigated in relation to milling time and compared with the case of motar grinding.From the powder milled for1to4hr, carbon solids with bulk density of about1.9g/cm³, d (002) spacing of3.39-3.40A, compressive strength of600-1000kg/cm² and shore hardness of about90were obtained.When milling time was prolonged more than1hr the strength decreased.The milling time of1hr to4hr was much shorter but the strength and the hardness were lower than the case of using agate mortar.

View full abstract

Download PDF (3754K)
Effect of Existence of Carbon Fiber on Carbonization of Coal-Tar Pitch under Pressure

Kazuro Kawamura, Shiushichi Kimura, Eiichi Yasuda, Michio Inagaki

1982 Volume 1982 Issue 109 Pages 46-52
Published: April 30, 1982
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1982.46

JOURNAL FREE ACCESS

Show abstractHide abstract

Carbon fiber/coal-tar pitch composite (51wt%carbon fiber) and a coal-tar pitch were carbonized up to 650°C in argon atmosphere at300kg/cm².The carbonization under pressure was carried out in sealed gold tube, which was set in a stellite bomb.The composite and the pitch thus carbonized were re-heated under normal pressure to investigate the effect of carbon fiber on the mesophase formation at the initial stage of carbonization, coke yield and graphitization of the pitch.
The mesophase formation in the pitch matrix of the composite was delayed under pressure.At the appearance of the mesophase spheres it was found to coalesce with each other, which seemed to accelerate by the presence of carbon fiber.Under pressure and with the presence of carbon fiber the coke yield from pitch increased.The stacking of lammelar molecules was oriented concentrically around the carbon fibers, when the bulk mesophase formed at 650°C.
The composite obtained at 650°C under pressure was re-heated from 1000°C to2500°C under normal pressure, formation of crack was observed in the coke matrix and also at the boundary of coke matrix and carbon fiber.The graphitizability of the coke matrix in the composite measured from the crystallite size and the interlayer spacing showed similar behaviour as the coke obtained from the pitch alone.

View full abstract

Download PDF (6748K)
[title in Japanese]

[in Japanese]

1982 Volume 1982 Issue 109 Pages 53-65
Published: April 30, 1982
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1982.53

JOURNAL FREE ACCESS

Download PDF (1912K)
[title in Japanese]

[in Japanese], [in Japanese]

1982 Volume 1982 Issue 109 Pages 66-74
Published: April 30, 1982
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.7209/tanso.1982.66

JOURNAL FREE ACCESS

Download PDF (1374K)

Register with J-STAGE for free!