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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

AI Technical Summary

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 the material, it is difficult to prepare flake powder with high purity requirements.
Most importantly, the ball milling method is only suitable for the preparation of some metal materials with low hardness, good toughness and plasticity, such as Al, Cu, Zn, Pb, Ag, Au and other metals and alloys, while for some high hardness brittle metals, alloys or Intermetallic compounds, as well as some new amorphous and microcrystalline materials, are difficult to achieve the desired effect due to their high deformation resistance or poor deformation ability

Method used

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

Examples

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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the special equipment of the present invention includes a melting crucible 1 placed in a closed atomization chamber 4, a rotary atomizer 2, a bearing 6 and a driving motor 3. Wherein, the turntable atomizer 2 is located below the melting crucible 1, and is a concave turntable with a certain taper. The bearing is installed on the rotating shaft of the atomizer. The outer side of the rotating shaft is covered with a water cooling chamber 7, and the motor is placed in the water cooling chamber. The powder collecting tank 5 is connected to the bottom of the atomization chamber 4: the diameter of the rotary 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 leak. Vacuum the spray chamber to 2×10 -2 Pa, and then filled with high-purity argon, the pressure is -0.05MPa. Heat the metallic silver to 1100°C to melt it, use a high-speed motor to accelerate the...

Embodiment 2

[0024] Such as figure 2 As shown, the diameter of the rotary 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 leak. Vacuum the spray chamber to 2×10 -2 Pa, and then into high-purity argon, the pressure is -0.02MPa. Heat metallic silver to 1200°C to melt it, use a high-speed motor to accelerate the turntable atomizer to 25,000 rpm, open the stopper at the leak, and the melt flows out from the leak 8 at a flow rate of 10 g / s. First, it is centrifugally atomized into tiny droplets, and controlled cooling to achieve a certain degree of supercooling, and then collides with the wall of the atomization chamber to form a sheet. The aspect ratio of the sheet is 80-200, and the oxygen content of the powder is 80ppm.

Embodiment 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 spray chamber to 3×10 -2 Pa, and then filled with high-purity argon, the pressure is 0.05MPa. 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 leak nozzle, and the melt flows out from the nozzle 8 at a flow rate of 10 g / s. First, it is centrifugally atomized into tiny liquid droplets, and through controlled cooling to achieve a certain degree of supercooling, and then collides with the wall of the atomization chamber and deforms into sheets with an aspect ratio of 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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