Method and apparatus for preparing sheet-type metal pwoder by atomized drop deformation

A flake metal and powder technology, applied in the field of metal powder preparation, can solve the problems of difficulty in preparing flake powder, cumbersome process operation, long process cycle, etc., and achieve the effects of reducing the degree of oxidation, simplifying the process process, and shortening the process cycle

Inactive Publication Date: 2005-10-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, ball milling is based on the basic principle of cold working deformation of metal materials. As the degree of deformation intensifies, the concentration of crystal defects increases during the formation of flake metal powder, and the material undergoes work hardening, which makes further deformation difficult and has become The flake powder is broken and pulverized, and the shape of the prepared flake powder tends to be irregular. Moreover, due to the cumbersome process operation, long process cycle, and easy contamination of th

Method used

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  • Method and apparatus for preparing sheet-type metal pwoder by atomized drop deformation

Examples

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Example Embodiment

[0020] Implementation example 1:

[0021] Such as figure 1 As shown, the special equipment of the present invention includes a smelting crucible 1, a turntable atomizer 2, a bearing 6 and a driving motor 3 placed in a closed atomization chamber 4. Among them, the turntable atomizer 2 is located below the melting crucible 1. It is a concave turntable with a certain taper. The bearing is installed on the rotating shaft of the atomizer. The outside of the rotating shaft is covered with a water-cooled chamber 7, and the motor is placed in the water-cooled chamber. The bottom of the atomization chamber 4 is connected with a powder collecting tank 5: the diameter of the turntable atomizer is Φ35mm, and the motor is a high-speed motor driven by a belt.

[0022] Take 2 kg of metallic silver and put it into a crucible with a spout. Vacuum the atomization chamber to 2×10 -2 Pa, then filled with high-purity argon at a pressure of -0.05MPa. Heat the metallic silver to 1100°C to melt it, use ...

Example Embodiment

[0023] Implementation example 2:

[0024] Such as figure 2 As shown, the diameter of the turntable atomizer is Φ25mm, and the motor is a high-speed motor coaxial with the atomizer.

[0025] Take 2 kg of metallic silver and put it into a crucible with a spout. Vacuum the atomization chamber to 2×10 -2 Pa, then enter high-purity argon at a pressure of -0.02MPa. Heat the metallic silver to 1200°C to melt it, use a high-speed motor to accelerate the turntable atomizer to 25000 rpm, open the stopper at the leak nozzle, and the melt flows out from the leak nozzle 8 at a flow rate of 10 g / sec. First, it is centrifugal atomized into tiny droplets, and through controlled cooling to reach a certain degree of supercooling, and then collides with the wall of the atomization chamber to deform into flakes, the aspect ratio of the flakes is 80-200, and the oxygen content of the powder is 80ppm.

Example Embodiment

[0026] Implementation example 3:

[0027] The diameter of the turntable atomizer is Φ30mm, and the motor is a high-speed motor coaxial with the atomizer. Take 2 kg of metal aluminum and put it into a crucible with a leak. Vacuum the atomization chamber to 3×10 -2 Pa, then filled with high-purity argon at a pressure of 0.05 MPa. Heat the metal aluminum to 800°C to melt it, use a high-speed motor to accelerate the turntable atomizer to 45,000 rpm, open the stopper at the drain nozzle, and the melt flows out from the drain nozzle 8 at a flow rate of 10 g / sec. It is firstly atomized by centrifugal atomization into tiny droplets, and through controlled cooling to reach a certain degree of supercooling, then, it collides with the wall of the atomization chamber and deforms into a sheet, the aspect ratio of the sheet is 200-300.

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Abstract

The present invention relates to a method for preparing flake metal powder by means of atomizing liquid drop deformation. Said method includes the following steps: heating and melting metal raw material, then making the molten metal be passed through the discharge spout of crucible bottom portion according to stable flow rate of 3-30g/sec. And be poured onto the center of disk rotated at high speed, the rotating speed of the disk is 1000-5000 rpm, under the action of centrifugal force atomizing and forming so as to obtain the invented product. Said equipment comprises, smelting crucible, rotating disk atomizer, drive motor, atomizing chamber, bearing and water-cooling chamber.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation, and in particular provides a method and equipment for preparing flake metal powder by deforming atomized liquid droplets. Background technique [0002] Flake metal powder materials are widely used in coatings and electronics, and can be used in decorative pigments, anti-corrosion coatings, electromagnetic shielding coatings, conductive pastes, conductive polymers, and conductive sintered bodies. In addition, in telecommunications, radar, television, power supply and other technologies, the use of flake metal powder to manufacture magnetic powder cores can significantly reduce its high-frequency eddy current loss and improve the high-frequency characteristics of magnetic powder cores. [0003] At present, the method of preparing flake metal powder at home and abroad is mainly the ball milling method, that is, the flake metal powder is prepared by the secondary processing deformati...

Claims

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Application Information

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IPC IPC(8): B22F9/10
Inventor 叶荣昌龙毅
Owner UNIV OF SCI & TECH BEIJING
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