C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/83 (2006.01) B28B 3/20 (2006.01) B28B 3/24 (2006.01) B28B 3/26 (2006.01) B28B 21/52 (2006.01) C04B 35/532 (2006.01)
Patent
CA 2362391
This invention relates to a process and a device for producing components and semi-finished product from synthetic graphite or from ceramic granules, in particular for producing graphite tubes, involving shaping of a material to be mixed preferably containing petroleum coke or graphite granules, by means of an extrusion press (22) or an extruder, wherein the process provides the following steps: a) Pre-pressing the material (20) to be mixed in static or quasi-static manner, flow movement of the material (20) to be mixed being stopped or impeded in such a way that particles previously irregularly arranged in the material to be mixed are initially aligned transversely to the direction of pressing, b) Pressing out of the pre-pressed material (20) to be mixed through an outlet opening (28) of the extrusion press (22) or the extruder in such a way that owing to adjusted flow properties of the material (20) to be mixed, the particles within the pre-compressed material (20) to be mixed realign, starting from their transverse alignment, by an angle (.beta.) of a maximum of 75° in the direction processing.
L'invention concerne un procédé et un dispositif destinés à la fabrication de composants et de produits corroyés en graphite de synthèse, en particulier de tubes graphite, faisant intervenir le façonnage au moyen d'une presse à filage (22) ou d'une extrudeuse, d'un mélange contenant de préférence du coke de pétrole ou du granulat de graphite. Ledit procédé consiste a) à préformer le mélange (20) de manière statique ou quasi-statique, des mouvements de flux dans le mélange (20) étant éliminés ou limités de manière que des particules du mélange ayant au préalable une orientation quelconque s'orientent perpendiculairement à la direction de compression, et b) à exprimer le mélange préformé (20) hors d'une ouverture de sortie (28) de la presse à filage (22) ou de l'extrudeuse, de manière que, du fait de propriétés d'écoulement réglées, les particules du mélange préformé (20) se décalent d'un angle ( beta ) inférieur ou égal à 75 DEG dans la direction de compression à partir de leur orientation perpendiculaire.
Kuenzel Juergen
Mueller Holger
Schmid Manfred
Fetherstonhaugh & Co.
Sgl Carbon Ag
Sgl Technik Gmbh
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