Process for manufacturing a molded article made of high density

Details Process for manufacturing a molded article made of high density Process for manufacturing a molded article made of high density

1997-07-18

1999-11-02

Jones, Deborah

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428 345, 428 361, 428218, 428402, 428913, 428920, 4234472, 4234474, 423448, 4234491, 264113, 264137, 264319, B32B 900

Patent

active

059766972

ABSTRACT:
The invention relates to a process for manufacturing an article of a high-density carbon. To produce an un-fired compact, binderless, self-sintering, fine-grained carbon powder, particularly carbon mesophases, with a powder density of more than 1 g/cm.sup.3, particularly more than 1.4 m/cm.sup.3, and an average grain size of between 5 and 20 .mu.m, is precompacted at a low pressure and is pressed in a mold to at a pressure of between 50 and 150 MPa, particularly at approximately 100 MPa. After pressing, the contact pressure is slowly lowered. Then, the un-fired compact is carbonized in a temperature gradient of maximally 20 K/min. The temperature is held constant at a holding temperature of between 500 and 700.degree. C. for a defined holding time and is subsequently raised to a maximal temperature of between 800 and 1,200.degree. C., particularly approximately 1,000.degree. C. Finally, the carbonized compact is graphitized at an end temperature of between 2,500-3,000.degree. C. in an inert atmosphere, preferably a noble gas and particularly preferably argon and/or nitrogen.

REFERENCES:
patent: 4046863 (1977-09-01), Kobayashi et al.
patent: 4874564 (1989-10-01), Sudani et al.
R. Fujiura, et al., "Mechanical Properties of Binderless Carbon Mould Prepared from Heart-Treated . . . ", Carbon vol. 33, No. 8, pp. 1061-1068, 1995 (No Month).

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