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Method and device for preparing micro-uniform grain using harmonic method

A harmonic method and uniform technology, which is applied in the field of micro-particle preparation, can solve problems such as instability and blocked jets of nozzles, and achieve the effect of small size, reduced equipment investment and good product quality.

Inactive Publication Date: 2008-10-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of Rayleigh jet stability conditions, the diameter of particles produced by uniform droplet injection technology is about 1.5 to 2.5 times the diameter of the nozzle. Cause nozzle clogging and jet instability

Method used

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  • Method and device for preparing micro-uniform grain using harmonic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Open the crucible loam cake, add the metallic material Sn-3.5Ag-0.5Cu 100g that needs melting in the crucible, and seal;

[0034] (2) Add cooling liquid into the collection device, move the baffle to the top of the collection device, and seal the vacuum chamber;

[0035] (3) vacuumize the crucible and the vacuum chamber, and fill it with nitrogen;

[0036] (4) Heating the crucible, melting the metal material in the crucible, and keeping warm for 20 minutes after the metal material is melted;

[0037] (5) Turn on the piezoelectric oscillator to generate a main frequency of 5KH Z , Harmonic vibration with a frequency ratio of 4, apply a voltage of 250V to the electrode plate, and use the pressure control system to achieve a stable pressure difference of 1.3P between the crucible and the vacuum chamber 0 , so that the molten metal is ejected from the nozzle at the bottom of the crucible in the form of a laminar jet. Under the action of the vibrating head of the piezo...

Embodiment 2

[0042] (1) Open the crucible loam cake, add the metal material Sn-5%Pb that needs melting in the crucible, and seal;

[0043] (2) Add cooling liquid into the collection device, move the baffle to the top of the collection device, and seal the vacuum chamber;

[0044] (3) vacuumize the crucible and the vacuum chamber, and fill it with nitrogen;

[0045] (4) Heating the crucible, melting the metal material in the crucible, and keeping warm for 30 minutes after the metal material is melted;

[0046] (5) Turn on the piezoelectric oscillator to generate a main frequency of 12KH Z Harmonic vibration with a frequency ratio of 2, apply a voltage of 300V to the electrode plate, and use the pressure control system to achieve a stable pressure difference of 1.5P between the crucible and the vacuum chamber 0 , so that the molten metal is ejected from the nozzle at the bottom of the crucible in the form of a laminar jet. Under the action of the vibrating head of the piezoelectric oscilla...

Embodiment 3

[0051] (1) Open the crucible loam cake, add the metallic material Sn-9%Zn ​​that needs melting in the crucible, and seal;

[0052] (2) Add cooling liquid into the collection device, move the baffle to the top of the collection device, and seal the vacuum chamber;

[0053] (3) vacuumize the crucible and the vacuum chamber, and fill it with nitrogen;

[0054] (4) heat the crucible, melt the metal material in the crucible, and keep warm for 25 minutes after the metal material is melted;

[0055] (5) Turn on the piezoelectric oscillator to generate a main frequency of 14KH Z , Harmonic vibration with a frequency ratio of 3, apply a voltage of 300V to the electrode plate, and use the pressure control system to achieve a stable pressure difference of 1P between the crucible and the vacuum chamber 0 , so that the molten metal is ejected from the nozzle at the bottom of the crucible in the form of a laminar jet. Under the action of the vibrating head of the piezoelectric oscillator,...

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Abstract

The invention discloses a method which adopts the harmonic method for preparing micro-even particles, and the method comprises the following steps: (1) metal material to be melted is added in a crucible; (2) cooling liquid is added in collection devices, and a vacuum cavity is sealed; (3) the vacuum extraction of the crucible and the vacuum cavity is carried out, and protective gas is filled; (4) the metal material in the crucible is melted; (5) a piezoelectric oscillator is opened; (6) the diameter of liquid drops is calculated; (7) charged main liquid drops and micro-liquid drops are separated when passing a deflecting electric field; (8) the main liquid drops and the micro-liquid drops are fallen into the respective collection devices after the separation of a deflecting polar plate. The device and the method for preparing the micro-even particles have strong process controllability, which can directly obtain the even particles with more micro-size, the process flow is short, the product quality is good, and the equipment investment is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of micro-particle preparation, in particular to a method and device for preparing micro-uniform particles using a harmonic method, which utilizes harmonic oscillation to control jet fracture to obtain micro-spherical droplets or particles. Background technique [0002] Chun and Passow from the Massachusetts Institute of Technology (MIT) proposed a new uniform droplet production method based on Rayleigh's capillary flow instability theory - uniform droplet ejection technology. By controlling the fracture behavior of the continuous molten metal jet, this technology can obtain spherical metal droplets or particles with uniform size. Compared with the traditional particle preparation method, it has the advantages of short process flow, good controllability, low equipment investment, high production efficiency and high product quality. Good quality and other characteristics. On the basis of this technology, Wu P...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 吴萍刘立娟周伟李宝凌王艺
Owner TIANJIN UNIV
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