摘要:
Uniform sized and shaped spheres (72) are formed by applying a minute periodic disturbance to a low viscosity liquid material. Pressure forces the material through at least one orifice in a crucible (20) as a steady laminar stream. The stream enters an enclosed controlled temperature solidification environment (14) which contains at least one heat transfer medium. A charging means (110) is applied to the stream as the stream exits the crucible and breaks into a plurality of spheres to deflect the spheres as they pass through an electric field. The enclosed controlled temperature solidification environment cools and substantially solidifies the spheres.
摘要:
In a high-speed fabrication process for producing highly uniform metallic microspheres, a molten metal (16) is passed through a small orifice (30), producing a stream of molten metal therefrom. A series of molten metal droplets forms from the break up of the capillary stream (32). To achieve high uniformity of the spheres and avoid defects, the droplets are cooled before being captured. Separating the droplets, by causing them to travel in different paths than their adjacent droplets, helps to facilitate the cooling of the droplets. The droplets can be separated by electrostatically charging them as they break off from the capillary stream. The droplets are then passed through an electric field, which can be produced by a pair of deflection plates (44). The droplets are dispersed by varying the electric field - e.g., by rotating the plates or by varying the voltage applied thereto - or by varying the charge of the droplets. Advantageously, the droplets can be actively cooled in flight by passing them through a cryogenic gas chamber.
摘要:
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Pulvermetall mit einem geheizten Tiegel (1), einem in seinem Bodenbereich (8) vorgesehenen Mundstück (5) mit einer verschließbaren Schmelzedüsc zur Ausbildung eines Schmelzestrahles (17), einer Inertgasversorgung für den Tiegel (1) und mit Inertgasdüsen (14) zum Zuführen von Inertgas zum Schmelzestrahl, um diesen zu zerstäuben Die Erfindung ist dadurch gekennzeichnet, dass der Tiegel (1) im Bereich des Mundstükkes (5) durch Gasbrenner (12) erwärmt wird. Die Erfindung betrifft auch Ausgestaltungen der Vorrichtung und ein Verfahren zur Herstellung von Pulvermetall.
摘要:
Rare earth magnetic alloy fine powders are manufactured by placing a mixture of a rare earth metal and a transition metal as raw materials in a crucible, induction heating it in an Ar gas atmosphere, melting metal elements contained in the above mixture, injecting an Ar gas at a predetermined pressure from above the molten alloy to expel the above molten alloy in a downward direction from the nozzle port of the above crucible, and applying a jet stream of an inert gas to the above expelled molten alloy to collide the above expelled molten alloy with the above inert gas so as to scatter the above molten alloy and solidify it by quenching. A rare earth bond magnet and a rare earth sintered magnet are produced using rare earth magnetic alloy fine powders obtained by the above process, which is rarely oxidized on the surface, almost spherical and uniform in diameter.
摘要:
Uniform sized and shaped spheres (72) are formed by applying a minute periodic disturbance to a low viscosity liquid material. Pressure forces the material through at least one orifice in a crucible (20) as a steady laminar stream. The stream enters an enclosed controlled temperature solidification environment (14) which contains at least one heat transfer medium. A charging means (110) is applied to the stream as the stream exits the crucible and breaks into a plurality of spheres to deflect the spheres as they pass through an electric field. The enclosed controlled temperature solidification environment cools and substantially solidifies the spheres.
摘要:
A zinc powder for use in a zinc anode, negative electrode or electrochemical cell comprising zinc metal or zinc alloy particles. The zinc particles have a narrow particle size distribution and a major portion of the having a well controlled chemistry and specific shape, such as teardrop, strand teardrop, acicular or spherical thereby providing improved discharge characteristics and reduced gassing. The powder can be produced by impulse atomisation.
摘要:
In a high-speed fabrication process for producing highly uniform metallic microspheres, a molten metal (16) is passed through a small orifice (30), producing a stream of molten metal therefrom. A series of molten metal droplets forms from the break up of the capillary stream (32). To achieve high uniformity of the spheres and avoid defects, the droplets are cooled before being captured. Separating the droplets, by causing them to travel in different paths than their adjacent droplets, helps to facilitate the cooling of the droplets. The droplets can be separated by electrostatically charging them as they break off from the capillary stream. The droplets are then passed through an electric field, which can be produced by a pair of deflection plates (44). The droplets are dispersed by varying the electric field - e.g., by rotating the plates or by varying the voltage applied thereto - or by varying the charge of the droplets. Advantageously, the droplets can be actively cooled in flight by passing them through a cryogenic gas chamber.