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Method for preparing flaky metal powder

A flake metal and powder technology, which is applied in the field of flake metal powder preparation, can solve problems such as the inability to continue the preparation and the adhesion of the metal drop tank wall, so as to avoid secondary processing and poor adaptability, short process cycle and high powder quality. high effect

Inactive Publication Date: 2010-12-01
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process of the atomized liquid droplets colliding with the atomized tank wall and deformed into flakes, since the atomized tank body is still, the metal droplets are easily adhered to the tank wall, making it impossible to continue the preparation.

Method used

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  • Method for preparing flaky metal powder
  • Method for preparing flaky metal powder

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 Shown is a schematic diagram of the process of preparing flake metal powder in the present invention. Among them, a melting crucible 1, a tundish crucible 2, a nozzle 3, a rotary atomizer 4, a water-cooled roller 5, an atomization chamber 6, and a powder collection tank 7.

[0027] Take 15 kg of metal tin and put it into the melting crucible 1; vacuumize the atomization chamber 6 to -0.1MPa, and then fill it with high-purity argon with a pressure of -0.07MPa. Put metal tin into the melting crucible 1, use resistance heating, melt and overheat and keep warm to 600°C, start and adjust the rotation speed of the rotary atomizer 4 to 5000 rpm, rotate clockwise, and the rotation speed of the water-cooled copper roller 5 to 1000 rpm Rotate counterclockwise; pour the metal melt into the tundish crucible 2, and the melt flows out from the nozzle 3 at a flow rate of 20 g / s. Impact deformation into flake powder. The flaky powder has a round and bright appearanc...

Embodiment 2

[0029] Take 20 kg of metal aluminum and put it into the melting crucible 1; vacuumize the atomization chamber 6 to 10-20Pa, and then fill it with high-purity argon gas with a pressure of 0.1MPa. Put metal aluminum into the melting crucible 1, use medium frequency induction heating, melt and overheat and keep warm to 800°C, start and adjust the rotation speed of the turntable atomizer 4 to 20000 rpm, rotate clockwise, and the rotation speed of the water-cooled copper roller 5 to 2000 rpm / min, rotate counterclockwise; pour the metal melt into the tundish crucible 2, the melt flows out from the diversion nozzle 3, the flow rate is 15 g / s, the melt is centrifugally atomized into tiny droplets, and then the water-cooled copper roller 5 The inner wall is impacted and deformed into flake powder. The flaky powder has a round and bright appearance; the particle size of the powder is 15-100 μm; the aspect ratio is concentrated between 100-200, and the oxygen content is 800 ppm.

Embodiment 3

[0031] Get 50 kilograms of metal iron and put it into the melting crucible 1; keep the normal pressure in the atomization chamber 6. Put metal iron into the melting crucible 1, use medium frequency induction heating, melt and overheat and keep warm to 1800°C, start and adjust the rotation speed of the turntable atomizer 4 to 50,000 rpm, rotate clockwise, and the rotation speed of the water-cooled stainless steel roller 5 to 20,000 rpm / min, rotate counterclockwise; pour the metal melt into the tundish crucible 2, the melt flows out from the nozzle 3, the flow rate is 100 g / s, the melt is centrifugally atomized into tiny droplets, and the water-cooled stainless steel roller 5 The inner wall is impacted and deformed into flake powder. The flaky powder has a round and bright appearance; the particle size of the powder is 1-75 μm; and the oxygen content is 2000 ppm.

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Abstract

The invention relates to a method for preparing flaky metal powder by deforming metal droplets by double-stage atomization, and belongs to the technical field of metal powder preparation. The method comprises the following steps of: heating metal to melt the metal, overheating the liquid metal and preserving the heat; guiding the liquid metal into a tundish crucible; pouring the liquid metal on a rotating disk atomizer with a rotation speed of between 5,000 and 50,000r / m by using a guide nozzle at the bottom of the tundish crucible at a stable flow rate (1 to 100 gram / second); atomizing the liquid metal into fine metal droplets under the action of centrifugal force; and colliding the metal droplets flying at a high speed with the inner wall of a water-cooled metal (copper, molybdenum, stainless steel and the like) roll with the rotation speed of between 1,000 and 20,000r / m (or the linear velocity of the surface of the roll is 0 to 100m / s) to deform and rapidly condensing the droplets into flaky powder. The obtained flaky metal powder is in the shape of a regular or irregular circular disk with a microcrystalline, nanocrystalline or non-crystalline structure. The method and equipment have the advantages of simple process, high efficiency, high powder quality and suitability for industrial production.

Description

technical field [0001] The invention relates to a method for preparing flake metal powder, in particular to a method for preparing flake metal powder by deformation of two-stage atomized metal droplets, which can be widely used in large-scale production of various flakes with rapid solidification characteristics. The metal powder belongs to the technical field of metal powder preparation. Background technique [0002] The flake metal powder with two-dimensional planar structure has been widely used in the fields of coatings and conductive pastes due to its good adhesion, significant shielding effect, strong ability to reflect light and excellent electrical conductivity. application. It can be used in decorative pigments, anti-corrosion coatings, electromagnetic shielding coatings, etc. In telecommunications, radar, television, power supply and other technologies, the magnetic powder core made of flake metal powder has the advantages of good high-frequency characteristics a...

Claims

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Application Information

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IPC IPC(8): B22F9/10
Inventor 李成栋朱学新徐骏郭宏石力开张乾向
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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