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Gas atomization nozzle for preparing superfine metal powder

A gas atomization nozzle and metal powder technology, applied in the field of atomization nozzles, can solve the problems of unfavorable atomization efficiency, reduced size of atomization nozzle, coarse powder particle size, etc. small effect

Inactive Publication Date: 2012-06-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1078928A 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 coarse
In industrial applications, the catheter is made of ceramic materials, and it is not feasible to reduce the diameter to less than 10mm. Therefore, the existence of the catheter limits the further reduction of the size of the atomizing nozzle, which is not conducive to the effective improvement of the atomization efficiency.

Method used

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  • Gas atomization nozzle for preparing superfine metal powder
  • Gas atomization nozzle for preparing superfine metal powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] use figure 1 For the nozzle structure shown, the maximum operating pressure of the nozzle is 3.0MPa, and the gas flow rate is 6Nm 3 / min (nitrogen), the cone angle of the upper part of the nozzle is 65°, the cone angle of the lower inner cone is 50°, the outer diameter of the outlet of the upper nozzle is 10mm, the diameter of the central through hole is 3.5mm, and the hole extending out of the lower nozzle Air outlet end 4.5mm. The upper nozzle is made of boron nitride ceramics. The atomization test of the powder was carried out with Fe-5.4wt%Si-9.6wt%Al iron alloy as the atomization object. The test alloy was 25kg, the atomization temperature was 1500°C, and the atomization pressure was 3.0MPa. 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 96.3%, and the proportion of powder with a particle size smaller than 45 μm (...

Embodiment 2

[0026] use figure 1 For the nozzle structure shown, the maximum operating pressure of the nozzle is 3.0MPa, and the gas flow rate is 5Nm 3 / min (nitrogen), the cone angle of the upper part of the nozzle is 65°, the cone angle of the lower inner cone is 50°, the outer diameter of the outlet of the upper nozzle is 8mm, the diameter of the central through hole is 3.0mm, and the hole extending out of the lower nozzle Air outlet end 4.5mm. The upper nozzle is made of boron nitride ceramics. Ni-14wt%Cr-10wt%P alloy was used as the atomization object to carry out the atomization test of the powder, the test alloy was 20kg, the atomization temperature was 1250°C, and the atomization pressure was 2.5MPa. After atomization, use a standard analytical sieve to measure the particle size of the powder. Among the atomized powder, the proportion of powder with a particle size smaller than 75 μm (-200 mesh) is 85%, and the proportion of powder with a particle size smaller than 45 μm (-320 me...

Embodiment 3

[0028] use figure 1 For the nozzle structure shown, the maximum operating pressure of the nozzle is 3.0MPa, and the gas flow rate is 4Nm 3 / min (nitrogen), the cone angle of the upper part of the nozzle is 55°, the cone angle of the lower inner cone is 40°, the outer diameter of the outlet of the upper nozzle is 8mm, and the diameter of the central through hole is 2.5mm, extending out of the lower nozzle Air outlet end 4.5mm. The upper nozzle is made of boron nitride ceramics. The atomization test of powder was carried out with pure aluminum as the object of atomization, the test alloy was 10kg, the atomization temperature was 800°C, and the atomization pressure was 2.5MPa. After atomization, use a standard analytical sieve to measure the particle size of the powder. Among the atomized powder, the proportion of powder with a particle size smaller than 150 μm (-100 mesh) is 95.5%, and the proportion of powder with a particle size smaller than 45 μm (-320 mesh) is 70.1%. , th...

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Abstract

The invention discloses a gas atomization nozzle for preparing superfine metal powder. The nozzle is characterized in that the working portion of an upper nozzle (1) is a cone frustum and a metal outflow channel (3) is axially arranged in the center of the upper nozzle; a lower nozzle (2) is formed by connecting an inner cone frustum below a cylindrical inner cavity; an arc-shaped transition section (7) of the lower nozzle is arranged at the joint; an air inlet cavity (4) is formed between the upper nozzle (1) and the cylindrical inner cavity of the lower nozzle (2); and throats (5) and airflow expansion sections (6) are formed by combination of the cone frustum of the upper nozzle (1) and the inner cone frustum of the lower nozzle (2), thus forming a channel with Laval nozzle structure characteristics. The nozzle is suitable for atomization of all the metals and alloy melts with melting points below 1500 DEG C and especially provides a new solution to preparation of the superfine powder of such metals with low melting points as aluminium, zinc, magnesium, tin and the like and alloys.

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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