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Even-sized particles producing device and method for preparing the same

A preparation device and uniform technology, applied in the field of metal powder preparation, can solve problems such as inability to perform real-time adjustment and control, and achieve the effects of good product quality, reduced errors, and reduced equipment investment

Inactive Publication Date: 2008-03-12
TIANJIN UNIV
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Problems solved by technology

However, since the metal jet is easily affected by the environment during the production process, the metal particles produced have a certain particle size distribution, and real-time adjustment and control cannot be performed during the production process.

Method used

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  • Even-sized particles producing device and method for preparing the same

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Embodiment Construction

[0024] The present invention mainly injects inert gas (such as nitrogen) into the crucible and the vacuum chamber, uses the pressure control system to make the crucible and the vacuum chamber reach a stable pressure difference, and makes the metal melt flow from the micro nozzle at the bottom of the crucible in a laminar flow. According to the principle of Rayleigh jet instability, the vibration generated by the piezoelectric oscillator is used to disturb the metal jet, so that the metal jet breaks into uniform droplets. The real-time size parameters of the generated droplets are obtained through the camera device combined with the computer image analysis software, and then for the optimized parameters, the loop feedback control system is used to control the frequency of the oscillator to reduce the difference between the generated metal droplets and the set droplet size. error. The metal droplets are charged by the electrode plate induction, so as to avoid mutual agglomeratio...

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Abstract

The present invention belongs to technology field of manufacturing metal powder, which specifically relates to a method and a device of manufacturing spheroid metal and alloy granular by making use of uniform liquid drop spray application techniques. Inert gas used by the present invention is bled into a crucible and a vacuum tight chamber that can obtain steady differential pressure by means of pressure control system, which makes mental fusant ejected in the form of laminar jet from a micro-nozzle positioned on a bottom of the crucible. Vibration disturbance mental shooting flow produced by a piezoelectric oscillator turns metal shooting flow into uniform droplets. And real-time size parameters of the droplets mentioned-above can be obtained by camera system and computer analysis software. Subject to the optimum parameters, frequency of control oscillator is fed back, thereby reducing size error of the metal droplets and predetermined droplets. The present invention is able to directly manufacture granular that is homogenized in size, shape and thermodynamic condition. The present invention has short technological process and products have good quality, which greatly reduces equipment investments.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation, and in particular relates to a device and method for preparing spherical metal and alloy particles by using a uniform droplet spraying technology. Background technique [0002] The preparation methods of metal powder can be roughly divided into two categories: physical chemical method and mechanical method. The mechanical method is mainly mechanical pulverization method and direct atomization method of metal melt, including mechanical grinding, cold air current pulverization, centrifugal pulverization and atomization, etc. method. Table 1 gives a comparison of various powder preparation technologies. It can be seen that the above-mentioned traditional particle or powder preparation methods have disadvantages such as large equipment investment, poor process controllability, and low product qualification rate. [0003] Table 1. Comparison of several common powder preparation techn...

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李述
Owner TIANJIN UNIV
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