HYDROSTATIC EXTRUSION OF CARBON AND GRAPHITE MATERIALS

In the hydrostatic extrusion method, the powder is enclosed in a rubber membrane and compressed in a hydraulic cylinder. According to Pascal's law, all sections on the exterior surface of the rubber bag are under identical pressure. Since in hydrostatic extrusion there is no friction in the outside layers, the rubber membrane is moved together with the particles adhering to it and the given density of the rod is attained at a pressure which is less by 20-30% than in the case of extruding in a mold. This type of rod has a more uniform density distribution throughout the volume than one which is extruded in a mold at the same pressure. It is suggested that this progressive method of extrusion be quickly introduced into industry. (Author) Unedited rough draft trans. of Konstruktsionnye Uglegrafitovye Materialy (USSR), n1 p30-3 1964, tr. F. Dion.