Method and device for preparing uniform-particle-diameter metal powder through quantitative centrifugal atomization method

Abstract

The invention discloses a method and a device for preparing uniform-particle-diameter metal powder through a quantitative centrifugal atomization method. According to the method, a perforated crucibleis driven by a motor to rotate, and then a molten metal liquid in the crucible is jetted from tiny holes in the crucible under the action of centrifugal force; after being jetted from the tiny holes,the metal liquid is atomized into metal liquid drops under the action of centrifugal force; under the action of gravity and surface tension, spherical metal liquid drops are formed; and during the falling process, uniform-particle-diameter metal spheres are formed. The method is matched with different crucible tiny-hole diameters and crucible rotation speeds, so that metal powder of different types can be prepared; the particle diameters are controllable; and the metal powder prepared according to the method has the characteristics being controllable in particle diameter, high in sphericity and uniform in particle size.

Description

technical field [0001] The invention belongs to the technical field of metal spherical powder preparation, in particular to a method and device for preparing metal powder with uniform particle size by quantitative centrifugal atomization method. Background technique [0002] With the development of material science, the position of spherical metal powder in material processing has been increasing day by day. At present, spherical metal powders have been widely used in solar cells, semiconductor integrated circuits, electronic packaging, precision manufacturing, chemical catalysis, biomaterials and other fields. The size, sphericity and particle size uniformity of spherical powders have become the key factors affecting product quality. [0003] At present, the methods for preparing spherical metal powder at home and abroad mainly include remelting method, uniform droplet spraying method and atomization method. Among them, the remelting method is to make metal raw materials ...

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Problems solved by technology

Among them, the remelting method is to make metal raw materials into filaments and cut them into uniform small pieces, and then immerse them in hot oil at an appropriate temperature to melt and solidify them into spherical particles. This method is simple in principle, but requires high manufacturing progress, and for small Materials with poor particle size or plasticity are difficult to process, and the production efficiency is low; the uniform droplet injection method is to melt the metal raw material, and extrude the liquid metal from the bottom of the crucible with holes through vibration extrusion to form a liquid pellet, thereby solidifying into Spherical metal powder, the spherical powder prepared by this method has uniform size and good quality, but the preparation process must adopt the method of vibration extrusion, which will have a certain impact on the stability of the liquid raw material in the crucible, especially as the liquid raw material decreases, its stability The performance will become worse and worse, and the preparation efficiency of this method is low, which is not suitable for industrial mass production; the atomization method is mainly divided into gas atomization method, water atomization method and centrifugal atomization method, because of the high production efficiency of this type of method, It has become the most commonly used spherical metal powder production method at present. The gas atomization method and the water atomization method both use the high-speed medium to form an impact on the liquid metal, thereby crushing the liquid metal flow to prepare metal powder, while the centrifugal atomization method uses the liquid metal Flowing into a high-speed rotating disc, thereby using centrifugal force to break liquid metal to prepare metal powder. The biggest defect of this type of method is that it cannot carry out quantitative crushing of liquid metal, which leads to uncontrollable particle size of the prepared spherical metal powder. The powder with suitable particle size can be obtained by layer-by-layer screening, and it is easy to produce a large number of satellite droplets, which seriously affects the performance of spherical metal powder

[0004] To sum up, there is still a lack of continuous and stable production of spherical metal powders with controllable size, high sphericity and uniform particle size distribution at home and abroad.

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