Abstract: The invention relates to the production of a metallic powder consisting of surface-fissured, so-called irregular particles, namely a water-atomised metallic powder. The aim of the invention is to obtain an irregular surface form of powder grains (23) in a narrow weight class and to impart a high porosity with a homogeneous distribution to the sintered body. To this end, in a first step, the pouring stream (2) is deviated in its flow direction and is enlarged on its surface, and in a second step, the surface-enlarged pouring stream (21) is deviated again its flow direction and is divided, and the liquid metallic particles (22) formed are accelerated, and in a third step, the displaced liquid metallic particles (22) are applied and divided, at an angle ? of between 10 and 90° in relation to the displacement direction of the same, with a high speed current (51) formed at least partially from a liquid medium, and the particles (23) are then solidified.

Abstract: A metal powder produced by a process which comprises directing at least three successive gas beams at a molten metal stream inside an atomization chamber, the at least three gas beams being oriented in different directions. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: The invention relates to the production of a metallic powder consisting of surface-fissured, so-called irregular particles, namely a water-atomised metallic powder. The aim of the invention is to obtain an irregular surface form of powder grains (23) in a narrow weight class and to impart a high porosity with a homogeneous distribution to the sintered body. To this end, in a first step, the pouring stream (2) is deviated in its flow direction and is enlarged on its surface, and in a second step, the surface-enlarged pouring stream (21) is deviated again its flow direction and is divided, and the liquid metallic particles (22) formed are accelerated, and in a third step, the displaced liquid metallic particles (22) are applied and divided, at an angle &ggr; of between 10 and 90° in relation to the displacement direction of the same, with a high speed current (51) formed at least partially from a liquid medium, and the particles (23) are then solidified.

Abstract: A metal powder produced by a process which comprises directing at least three successive gas beams at a molten metal stream inside an atomization chamber, the at least three gas beams being oriented in different directions. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: Process and a device for producing metal powders from molten metal. The process includes directing at least three successive gas beams at a molten metal stream inside an atomization chamber, the at least three gas beams being oriented in different directions. The device includes a metallurgical vessel for holding molten metal provided with a nozzle element for discharging a molten metal stream into an atomization chamber as well as at least three gas nozzle elements for providing at least three gas beams of different orientation and directed at different points of the molten metal stream inside the atomization chamber.

Abstract: The invention relates to a process for the powder metallurgical production of objects from tool steel as well as to such an object.

Abstract: Apparatus and process for manufacturing metal powder from a molten mass. The process occurs in an apparatus that includes at least one metallurgical vessel adapted to at least one of treat and prepare a batch of the molten mass, and an atomizing chamber including a nozzle part adapted to sputter a portion of the molten mass, a feed side coupled to the metallurgical vessel, and a discharge side. The atomizing chamber has a longitudinal axis arranged inclined downwardly from the feed side to the discharge side. The apparatus also includes a separator adapted for classifying the metal powder, and an encapsulating facility including at least one container. The metal powder is to be inserted and enclosed within the at least one container. A conveyance unit for powder transport includes an ascending pipe oriented to guide the metal powder upwardly.

Abstract: Process and a device for producing metal powders from molten metal. The process includes the provision of molten metal in a metallurgical vessel having a nozzle element, the nozzle element being directed into an atomization chamber associated with the metallurgical vessel. The molten metal is allowed to flow through the nozzle element of the metallurgical vessel into the atomization chamber whereby a molten metal stream is fed into the atomization chamber. At least three successive gas beams are directed at the molten metal stream inside the atomization chamber, the at least three gas beams being oriented in different directions. Thereby the molten metal stream is broken down into droplets which subsequently freeze into grains that are collected.

Abstract: Process and a device for producing metal powders from molten metal. The process includes directing at least three successive gas beams at a molten metal stream inside an atomization chamber, the at least three gas beams being oriented in different directions. The device includes a metallurgical vessel for holding molten metal provided with a nozzle element for discharging a molten metal stream into an atomization chamber as well as at least three gas nozzle elements for providing at least three gas beams of different orientation and directed at different points of the molten metal stream inside the atomization chamber.

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").

Abstract: A method of making pipes by powder metallurgy, in which powder of metal and/or metal alloys (17) is filled into a thin-walled casing consisting of inner pipe wall (12), outer pipe wall (11) and a bottom (13), subsequently the casing is closed on its side remote from the bottom (13) by an annular cover (14) and is subjected to a cold-isostatic pressure whereby the powder (17) is compacted within the casing to produce a solid or dimensionally stable pipe blank or compact (10), which is then hot-worked, e.g. extruded. In order to prevent thermal cracks on the inner pipe or inner pipe wall (12), especially in the region of the ends thereof, the inner pipe or inner pipe wall (12) is provided prior to hot-working on at least one end region thereof with at least one circumferentially extending bulge (15 or 16, respectively).

Abstract: A method of making powder-metallurgical articles, in which powder of metal and/or metal alloys is filled into a thin-walled casing, whereupon the casing is closed and subjected to cold-isostatic pressure. Thereby the powder within the casing is compacted to form a strong or, respectively, dimensionally stable article. When the casing wall includes a joining weld seam, said casing wall is provided with an elastically expandable layer in the close vicinity of the weld seam in order to prevent formation of a fold, preferably in such a way that an approximately uniform prestress is applied to the wall surface.

Abstract: This invention relates to a capsule for pressings pressed by isostatic pressure and to these pressings used for extruding metallic objects, particularly tubes, of stainless steel, the outer and inner wall of the capsule consisting of thin-walled sheet metal, and at least the outer wall having substantially the same strength properties in the axial direction along its circumference and particularly consisting of a spiral-welded tube, and preferably at least on the front end of the capsule an insert being provided, which consists of one or more pieces of a ductile solid material or a ductile material pressed from powder. The invention further relates to a process for the production of such capsules and pressings and to a process for extruding tubes and to the tubes obtained according to this process.