Atomizing nozzle for efficiently preparing fine metal and alloy powder

A technology of alloy powder and atomizing nozzle, which is applied in the field of atomizing nozzle, can solve the problem of coarse powder particle size, etc., and achieve the effect of increasing production rate, reducing production cost and reducing dosage

Active Publication Date: 2009-12-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1078928A invented a supersonic annular jet atomizer, which atomizes low-melting point metals under low pressure, which is not suitable for atomizing high-melting point metals, and the powder particle size is relatively coars

Method used

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  • Atomizing nozzle for efficiently preparing fine metal and alloy powder
  • Atomizing nozzle for efficiently preparing fine metal and alloy powder

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Experimental program
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Effect test

Embodiment 1

[0021] use figure 2 For the nozzle structure shown, the maximum operating pressure of the nozzle is 4.0MPa, and the gas flow rate is 8Nm 3 / min (nitrogen), the cone angle of the upper cone of the nozzle is 65°, the cone angle of the lower inner cone is 50°, and a catheter with a tapered outlet is used. The outer diameter of the catheter is 12mm and the inner diameter is 3.5 mm, the catheter protrudes 4.5mm from the air outlet end of the nozzle. 316L stainless steel was used as the atomization object to carry out the atomization test of the powder, the test alloy was 30kg, the atomization temperature was 1600°C, and the atomization pressure was 4.0MPa. After atomization, use a standard analytical sieve to measure the particle size of the powder. In the atomized powder, the proportion of powder with a particle size smaller than 150 μm (-100 mesh) is 98.5%, and the proportion of powder with a particle size smaller than 45 μm (-320 mesh) is 71.3%. , the proportion of powder sma...

Embodiment 2

[0023] use figure 2 For the nozzle structure shown, the maximum operating pressure of the nozzle is 4.0MPa, and the gas flow rate is 8Nm 3 / min (nitrogen), the cone angle of the upper cone of the nozzle is 65°, the cone angle of the lower inner cone is 50°, and a catheter with a tapered outlet is used. The outer diameter of the catheter is 10mm and the inner diameter is 3.5 mm, the catheter protrudes 4.5mm from the air outlet end of the nozzle. The atomization test of the powder was carried out with Cu-10wt% Al alloy as the atomization object, the test alloy was 30kg, the atomization temperature was 1200°C, and the atomization pressure was 4.0MPa. After atomization, the powder is measured with a standard analytical sieve for powder particle size. Among the atomized powder, the proportion of powder with a particle size smaller than 75 μm (-200 mesh) is 87.2%, and the proportion of powder with a particle size smaller than 45 μm (-320 mesh) is 78.3%. , the proportion of powder...

Embodiment 3

[0025] use figure 2 For the nozzle structure shown, the maximum operating pressure of the nozzle is 4.0MPa, and the gas flow rate is 8Nm 3 / min (nitrogen), the cone angle of the upper cone of the nozzle is 55°, the cone angle of the lower inner cone is 40°, and a catheter with a tapered outlet is used. The outer diameter of the catheter is 12mm and the inner diameter is 3.5 mm, the catheter protrudes 4.8mm from the air outlet end of the nozzle. 316L stainless steel was used as the atomization object to carry out the atomization test of the powder, the test alloy was 30kg, the atomization temperature was 1600°C, and the atomization pressure was 4.0MPa. After atomization, use a standard analytical sieve to measure the particle size of the powder. In the atomized powder, the proportion of powder with a particle size smaller than 150 μm (-100 mesh) is 94.5%, and the proportion of powder with a particle size smaller than 45 μm (-320 mesh) is 65.8%. , the proportion of powder sma...

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Abstract

The invention discloses an atomizing nozzle for efficiently preparing fine metal and alloy powder. A working part of an upper part is a truncated cone; a lower part is that an inner truncated cone is connected under a cylindrical inner cavity; the upper and lower truncated cones form a gas channel after the combination; and the gas channel is narrowest at an outlet of an air cavity, and then gradually diverges to form a channel with structural characteristics of an Laval nozzle. The atomizing nozzle has the advantages that the gas channel of the nozzle has the structural characteristics of the Laval nozzle, can produce high-speed airflow, improve the kinetic energy of atomizing gas, further improve the impact grinding effect of the airflow on liquid metal by adopting a liquid delivery tube with a large injection angle and a small diameter, and greatly increase the yield of fine powder. The nozzle is also suitable for the atomization of all metal and alloy melts the melting points of which are lower than 1,600 DEG C, and provides a solution for the preparation and application of most of gas-atomized powder.

Description

technical field [0001] The invention relates to an atomizing nozzle which breaks liquid metal and alloy melt into small droplets and solidifies into powder by using high-pressure airflow, especially the atomizing nozzle which prepares the powder with fine particle size and spherical characteristics. Background technique [0002] Gas atomization technology is a production method of metal and alloy powder. The principle of powder making is to use a high-speed airflow to crush the liquid metal flow from the catheter tube into small droplets and solidify into powder during the subsequent flight. . Gas-atomized powder has the advantages of high sphericity and controllable powder particle size, and has become the main direction for the preparation of high-performance and special alloy powders. [0003] The atomizing nozzle is the core of the gas atomization technology. The nozzle controls the action process of the airflow on the metal liquid flow, so that the kinetic energy of th...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 陈仕奇
Owner CENT SOUTH UNIV
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