Process for producing high-density and high-strength carbon arti

Details Process for producing high-density and high-strength carbon arti Process for producing high-density and high-strength carbon arti

1995-09-18

1997-03-11

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

In specific atmosphere

264 121, 264 297, C01B 3102

Patent

active

056098006

ABSTRACT:
Self-adhesive carbonaceous grains for use in the manufacture of high-density and high-strength carbon artifacts containing 0.5-1.5 wt % of a quinoline-soluble but pyridine-insoluble component and at least 97 wt % of a quinoline-insoluble component and which are prepared by heat-treating in a nonoxidizing atmosphere a mesophase pitch that is obtained by polymerizing condensed polycyclic hydrocarbons or substances containing them in the presence of a superacid consisting of hydrogen fluoride and boron trifluoride. The carbonaceous grains are molded and the mold is baked at a sufficient temperature to achieve its carbonization, with the heating rate being not more than 20.degree. C./h in the temperature range from 400 .degree. to 600.degree. C. In this way, high-density and high-strength carbon artifacts showing a homogeneous fine mosaic texture of optical anisotropy can be efficiently manufactured in high carbon yield.

REFERENCES:
patent: 3956436 (1976-05-01), Honda et al.
patent: 4293533 (1981-10-01), Asano et al.
patent: 4637906 (1987-01-01), Fukuda et al.
patent: 4789455 (1988-12-01), Mochida et al.
patent: 4891128 (1990-01-01), Mochida et al.
International Symposium on Carbon, Toyohashi, Extended Abstract, p. 196 Carbon, vol. 28, 1990, p. 559 and p. 143, "Viscous Flow of Black Carbon . . . "1990 (no month avail.).
Tanso No. 155, p. 370, 1992 "Preparation, Structure and Application of Mesophase Patches . . . "1992 (no month avail.).

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