Abstract: A method of powder-metallurgical production of objects, specifically tubes, rods, or the like, wherein a metal and/or metal alloy powder is charged into a thin-walled capsule is provided. The capsule is closed and exposed to a cold-isostatic pressure so as to form a compression of the capsule for subsequent hot-working, specifically hot extrusion. Prior to the cold-isostatic pressure, a mixture of nitrogen and hydrogen is introduced into the capsule together with the powder of metal and/or metal alloys. Simultaneously, pre-compaction of the powder is created by way of vibration or the like, to a density of approximately 60 t0 80% such as, in particular 70% of the theoretical density. After the cold-isostatic pressing step, the capsule is subjected to porosity or leakage testing in a vacuum chamber to monitor or establish the escape of hydrogen. Non-leaking capsules or pressings are then heated and subjected to hot-working such as hot extrusion.

Abstract: Method of and apparatus for powder-metallurgical manufacture of tubes or like elongated profiles, in which metal and/or metal alloy powder (3) is filled--if applicable with pre-compacting by means of vibrations or the like--into a thin-walled capsule, the latter is subsequently closed and cold and/or hot-pressed by means of universally acting isostatic pressure, and the thus obtained compact is further processed, especially extruded. For forming the tubular compact, the capsule filled with powder (3) after closing (cover 9; 9'; 9") and isostatic pressing is centrally pierced (hole 26) by means of a mandrel (4, 5) whereby the powder (3) is correspondingly radially compacted from the inside towards the outside. The capsule features a cylindrical outer casing (8), a bottom (14) and a cover (9; 9'; 9").