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Method for lowering powder size and changing powder shape in atomization process of molten metal

A metal melt and atomization process technology, applied in the field of powder metallurgy, can solve the problems of increased energy consumption, difficulty in obtaining flake powder, complicated technology, etc., and achieve the effect of reducing particle size

Inactive Publication Date: 2016-02-03
POCO HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous technology is to increase the pressure and flow of the atomized fluid, which is achieved by using special nozzles (such as high-pressure nozzles, supersonic nozzles, close-coupled nozzles, etc.), which are complicated in technology and high in energy consumption.
In addition, in the gas atomization process of metal melts, generally only spherical, spherical and complex shape powders can be obtained, and most of these powders can only be used in powder metallurgy products
It is difficult to obtain flake powder during the atomization process. The flake powder is obtained by ball milling and rolling the atomized powder. The follow-up process is complicated and the energy consumption increases

Method used

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  • Method for lowering powder size and changing powder shape in atomization process of molten metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 , an atomizing device for reducing the particle size of powder and changing the shape of powder during the atomization process of molten metal, comprising an intermediate leakage bag 20 and an atomization chamber for accommodating molten metal 10, the connection between the intermediate leakage bag 20 and the atomization chamber There is a leak nozzle 30 in between which allows the molten metal 10 to enter the atomization chamber from the middle leak bag 20. The leak nozzle 30 is provided with a leak nozzle head 40, and the leak nozzle head 40 is provided with one or more holes.

[0029] Described hole can be any shape, for example circle ( figure 2 a), rectangle ( figure 2 b, 2c), cross ( figure 2 d) etc.

[0030] use figure 2 The nozzle head 40 shown in a changes one hole of the original nozzle into 2-10 small holes without changing the area of ​​the metal liquid flow column, and the diameter of the single-hole metal melt column becomes small...

Embodiment 2

[0031] Embodiment 2 prepares Sn powder

[0032] Sn powder is prepared by using the existing technology, using a pressure of 1.2Mpa and a flow rate of 8m 3 / min nitrogen gas, Sn powder is prepared through the annular nozzle, the hole diameter of the leak nozzle is 5mm, the flow rate of the molten metal is 15Kg / min, and the average particle size of the atomized powder is 80μm.

[0033] Also adopt the same pressure and flow nitrogen to prepare Sn powder through the annular nozzle, the flow rate of the molten metal is the same, and the nozzle head hole is changed from one hole in the prior art to 6 holes ( figure 2 a), the diameter of each small hole is 2.1 mm, and the average particle size of the atomized powder is 44 μm. This process greatly reduces the average particle size of Sn powder.

Embodiment 3

[0034] Embodiment 3 prepares stainless steel powder

[0035] The stainless steel powder is prepared by the existing technology, and the stainless steel powder is atomized by high-pressure water. The particle size is 30 μm.

[0036] Using high-pressure water with the same flow rate and the same pressure, using annular nozzles, the flow rate of the molten metal is 20kg / min, and the nozzle head hole is changed from one hole in the prior art to 5 holes, and the diameter of each small hole is 2.5mm. The average particle size of the powder is 20 μm.

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Abstract

The invention provides a method for lowering the powder size and changing the powder shape in the atomization process of molten metal. A discharge spout head is arranged at the position, where the molten metal enters an atomization chamber through a leak tundish, of a discharge spout. The discharge spout head is provided with one or more holes. The molten metal enters the atomization chamber through the holes in the discharge spout head and is beaten and smashed into metal powder through high-pressure gas or high-pressure water. Under the conditions that the pressure or flow or nozzle structure of original fluid is not changed, and the atomization productivity is not changed, only the discharge spout structure of metal liquid is changed, the grain size of metal powder can be effectively reduced, and the average grain size can be reduced to 20-40 micrometers. The method can be used for preparing flaky or elliptical flaky powder or powder in other shapes, and the problem that flaky powder can be obtained through subsequent processing in the prior art is solved.

Description

technical field [0001] The present invention relates to the field of powder metallurgy, in particular to a method for reducing powder particle size and changing powder shape during metal melt atomization, and also relates to a method for reducing powder particle size and changing powder shape during metal melt atomization device. Background technique [0002] The atomization method is a common method for preparing metal powder, which uses water or inert gas to crush the metal or alloy melt to produce powder. The previous technology is to increase the pressure and flow of the atomized fluid, and use special nozzles (such as high-pressure nozzles, supersonic nozzles, close-coupled nozzles, etc.) to achieve this. The technology is complicated and the energy consumption is high. In addition, in the gas atomization process of metal melts, generally only spherical, spherical and complex shape powders can be obtained, and most of these powders can only be used in powder metallurgy...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 郭雄志
Owner POCO HLDG CO LTD
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