Method and device for efficiently preparing uniform spherical micro-particle through pulse small-hole multi-vibrating-rod injection process
A spray method and multi-vibration technology, applied in the field of spherical microparticle preparation, can solve the problems of low production efficiency, uneven particle size, uncontrollable particle size, etc., and achieve high production efficiency, low cost and simple structure.
Active Publication Date: 2013-04-03
DALIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a device for efficiently preparing uniform spherical microparticles by the pulse small hole multi-vibrating rod spraying method. The device increases the number of molten pools on the basis of the existing pulse small hole spraying method. sheet, so that under the drive of the same piezoelectric ceramics, uniform spherical metal particles with different particle sizes can be mass-produced at the same time; the pulse small-hole multi-vibrating rod injection method of the present invention efficiently prepares uniform spherical micro-particles. Under the condition of Ar gas, the heater is used to heat the crucible until the inner metal is in a molten state, and a certain pulse signal is applied to the piezoelectric ceramic, so that it drives the transmission rod to produce a small longitudinal displacement, and this displacement acts on the metal melt at the bottom of the crucible , so that tiny droplets are ejected from the small hole at the bottom of the crucible, and the droplets solidify into uniform spherical metal particles without a container during the falling process; it solves the problems of uneven particle size, low production efficiency, and uncontrollable particle size in the existing preparation technology insufficient
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[0023] Specific implementation of batch preparation of Sn-0.3Ag-0.7CuBGA encapsulated balls:
[0024] (1) Cut the Sn-0.3Ag-0.7Cu metal wire into a metal rod of equal length, put it into the crucible 15 after ultrasonic vibration, and select the aperture size of the ceramic sheet 7 according to the requirement; the Sn-0.3Ag-0.7Cu metal The amount of rods put in reaches 3 / 4 of the molten pool 5, such as figure 1 shown;
[0025] (2) Use the mechanical pump 12 to pump the crucible 15 and the vacuum chamber 17 of the ejection part to a low vacuum of 5 Pa, and then use the diffusion pump 13 to pump the crucible 15 and the vacuum chamber 17 of the ejection part to a high vacuum of 0.001 Pa; use the upper vent pipe 2 and the lower vent pipe 6 are fed with inert gas Ar gas, so that the pressure in the crucible 15 of the injection part and the vacuum chamber 17 reaches 0.1 MPa;
[0026] (3) Set the power of heater 4 to 400W and the heating temperature to 260 o C, close the switch to ...
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Abstract
The invention relates to a method and a device for efficiently preparing uniform spherical micro-particles through a pulse small-hole multi-vibrating-rod injection process, belonging to the technical field of spherical micro-particle preparation. The method is characterized in that under the condition that inert gas Ar is fed to produce backpressure, heaters are used for heating metal materials in a plurality of melting baths in a crucible to a molten state, then certain pulse signals are input into piezoelectric ceramic to enable a transmission rod to produce a longitudinal micro displacement, the transmission rod acts on molten metal, a certain quantity of micro liquid is enabled to be sprayed out from small holes at the bottoms of the melting baths to form liquid drops, the dimension data of the liquid drops is analyzed in real time through an image pickup system in combination with computer software, parameters are adjusted to be optimal, and finally the liquid drops are solidified without using a container to form uniform spherical metal particles. The method and the device for efficiently preparing uniform spherical micro-particles through the pulse small-hole multi-vibrating-rod injection process have the beneficial effects that the uniform spherical particles with different sizes can be efficiently prepared at the same time, the heat history of the particles is consistent, the sphericity is good, the size is controllable, the production efficiency is greatly improved and the production is saved.
Description
technical field [0001] The invention belongs to the technical field of preparation of spherical microparticles, and in particular relates to a method and a device for efficiently preparing uniform spherical microparticles by means of a pulse small-hole multi-vibrating rod injection method. 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 particles with required roundness and particle size, and can be applied to special occasions, such as spherical solar cells (silicon particles), B...
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Inventor 董伟谭毅鲁栋
Owner DALIAN UNIV OF TECH