A kind of preparation device and preparation method of uniform spherical microparticles

Abstract

The invention discloses a device and a method for manufacturing uniform spherical micro-particles. The device comprises a crucible, an induction heater, an induction coil, a concentrator, a mechanical pump, a diffusion pump, a cavity, a high-speed camera and a collector. The device and the method have the advantages that capillary jet flow is cut by the aid of electromagnetic force to manufacture the uniform spherical micro-particle, metal materials molten in the crucible are ejected from small holes in the bottom of the crucible under the effect of pressures to form the capillary jet flow, the electromagnetic force is generated by the induction coil and acts on the capillary jet flow via the concentrator, sausage-shaped liquid droplet strings are gradually formed by the capillary jet flow under the disturbance effects of surface tension and the electromagnetic force and can be ultimately dispersed to form liquid droplets with consistent sizes and equal distances, and metal particles can be formed by the liquid droplets in containerless solidification procedures; the metal particles manufactured by the aid of the method are uniform in particle size (the relative deviation of the particle sizes is smaller than 1.8%) and are high in sphericity, and manufacturing materials can be prevented from being polluted by the crucible in the solidification procedures.

Description

technical field [0001] The invention belongs to the technical field of preparation of spherical microparticles, and in particular relates to a preparation device and a preparation method of uniform spherical microparticles. Background technique [0002] Uniform spherical micron-sized particles range in size from nanometers to millimeters, and are special spherical powder particles. This kind of microparticle bears the upper limit of nano-processing and the lower limit of mechanical processing. It has an irreplaceable position and role in both size connection and performance requirements, as well as in the field of net shape and micro-processing manufacturing. Solidification of droplets through containerless drop solidification or cooling liquid quenching can obtain the required sphericity and particle size particles, and can be applied to special occasions, such as spherical solar cells (silicon particles), BGA electronic packaging (lead-free Solder ball particles, copper-t...

AI Technical Summary

Problems solved by technology

The dispersion of spherical particles prepared by the atomization method is relatively wide, and particles that can meet the requirements of use must be obtained through multiple screening and testing; the shredding method or punching and remelting method is difficult for materials with poor plastic processing. The prepared spherical particles must be degreased; during the production process of the uniform droplet forming method, the metal jet is easily affected by the environment, resulting in a certain particle size distribution of the produced particles, which cannot be adjusted and controlled in real time during the production process

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