Improved process for the production of carbon bodies

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 31/02 (2006.01) C01B 31/04 (2006.01)

Patent

CA 2601610

A method of forming a graphitic carbon body employs compression and resistance heating of a stock blend of coke and pitch. Preferably, the stock includes raw coke, high melting point pitch, and carbon fibers derived from pitch. Optionally, the stock may also include calcinated coke, graphite, carbon fibers, coal tar or petroleum pitch, or coking catalysts such as sulfur. During molding of the body, resistance heating is accompanied by application of mechanical pressure to increase the density and carbonization of the resulting preform body. The preform is then subjected to a graphitization temperature to form a graphitic carbon body, such as a graphite electrode or pin. Optionally, after hot-pressing, the preform electrode or pin may be subjected to one or more densification steps employing a carbonizable pitch to further increase the density of the preform prior to the graphitization step.

L'invention concerne un procédé permettant de former un corps en graphite et mettant en oeuvre un chauffage par compression et résistance d'un mélange de pâte de coke et de brai. La pâte comprend, de préférence, de la coke brute, du brai à point de fusion élevé et des fibres de carbone dérivées du brai. La pâte peut éventuellement également renfermer de la coke calcinée, du graphite, des fibres de carbone, du goudron de houille ou du brai de pétrole ou des catalyseurs de cokéfaction, tels que du soufre. Au cours du moulage du corps, le chauffage par résistance est accompagné d'une application de pression mécanique, aux fins d'augmentation de la densité et de la carbonisation du corps de préforme obtenu. La préforme est ensuite soumise à une température de graphitisation afin de former un corps en graphite, tel qu'une électrode ou broche en graphite. Après le pressage à chaud, l'électrode ou broche en préforme peut éventuellement être soumise à une ou plusieurs étapes de densification mettant en oeuvre un brai carbonisable, aux fins d'augmentation de la densité de la préforme avant l'étape de graphitisation.

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