Fine metal powder atomizing spray nozzle with molten metal easily flowing out

A technology of atomizing nozzles and metal powders, which is applied in the field of fine metal powder atomizing nozzles, can solve the problems of shortening the length of the catheter, reducing the efficiency of atomization, and affecting the nozzle, so as to overcome the plugging phenomenon and improve the fog Improve efficiency and increase stability

Active Publication Date: 2012-12-26
HUNAN HENGJI POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to existing knowledge and experience, the length of the catheter has an important influence on the stability of the atomization process, especially for metals with high melting points. Too long catheters (such as more than 30mm) will affect the stability of the atomization. sex brings many problems
The liquid catheter of the atomizing nozzle used in general industry is not directly heated (direct heating is more complicated and has an impact on the nozzle), but relies on the radiation heating of the tundish. A long catheter will lead to insufficient radiation temperature and lead to The outlet temperature of the tube is not high, which is easy to cause plugging and flow interruption
The use of too long catheter for high melting point metals often makes it difficult for the melt to flow down, and the success rate of atomization is not high. In industrial practice, the diameter of the catheter is often increased (such as increased to 6mm or above) to solve this problem. a question
Although increasing the diameter can solve the problem of plugging and flow interruption, it will also significantly increase the flow rate of the molten metal and the size of the atomizer, which will lead to a significant decrease in the atomization efficiency and a significant coarsening of the

Method used

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  • Fine metal powder atomizing spray nozzle with molten metal easily flowing out

Examples

Experimental program
Comparison scheme
Effect test

Example

[0032] example 1

[0033] use figure 1 The nozzle structure shown has a spray angle of 55°, a linear expansion section length of 5 mm, an outer diameter φ of the catheter 8 is 15 mm, an inner diameter of 4.0 mm, and a length in the nozzle of 30 mm. The atomization test of powder was carried out with 304L stainless steel as the atomization object. The test alloy was 50kg, the atomization temperature was 1600°C, and the atomization pressure was 4.5MPa. After atomization, use a standard analytical sieve to determine the particle size of the powder. In the atomized powder, the proportion of powder with a particle size of less than 150μm (-100 mesh) is 95.0%, and the proportion of powder with a particle size of less than 45μm (-320 mesh) is 69.3% , The proportion of powder smaller than 23μm (-600 mesh) is 53.2%, and the average particle size of the powder is d 50 About 20μm.

Example

[0034] Example 2

[0035] use figure 1 The nozzle structure shown has a spray angle of 50°, a straight expansion section length of 3mm, the outer diameter of the catheter is 15mm, the inner diameter is 4.0mm, and the length inside the nozzle is 25mm. The atomization test of the powder was carried out with 17-4ph stainless steel as the atomization object. The test alloy was 50kg, the atomization temperature was 1580°C, and the atomization pressure was 4.5MPa. After atomization, the powder is measured with a standard analytical sieve. The proportion of powder with a particle size of less than 150μm (-100 mesh) in the atomized powder is 95.5%, and the proportion of powder with a particle size of less than 45μm (-320 mesh) is 75.0% , The proportion of powder smaller than 23μm (-600 mesh) is 62.3%, and the average particle size of the powder is d 50 About 18μm.

Example

[0036] Example 3

[0037] use figure 1 The nozzle structure shown has a spray angle of 60°, a linear expansion section length of 5mm, an outer diameter of a catheter of 15mm, an inner diameter of 4.5mm, and a length of 25mm in the nozzle. The powder atomization test was conducted with 316L stainless steel as the atomization object. The test alloy was 50kg, the atomization temperature was 1600°C, and the atomization pressure was 4.5MPa. After atomization, the powder is measured with a standard analytical sieve. The proportion of powder with a particle size of less than 150μm (-100 mesh) in the atomized powder is 93.5%, and the proportion of powder with a particle size of less than 45μm (-320 mesh) is 70.8% , The proportion of powder smaller than 23μm (-600 mesh) is 56.5%, and the average particle size of the powder is d 50 About 22μm.

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Abstract

The invention discloses a fine metal powder atomizing spray nozzle with molten metal easily flowing out. The fine metal powder atomizing spray nozzle is formed by a first assembly and a second assembly, wherein the first assembly is formed by connecting a cone frustum with the lower part of a cylindrical table; a liquid guide pipe is arranged at the center of the first assembly; the second assembly is formed by connecting a conical inner cavity with the lower part of a cylindrical inner cavity; an annular groove is formed in the wall of the cylindrical inner cavity of the second assembly; a horizontal ring surface and an inner arc rotating body which are sequentially connected are arranged at the connected part of the cylindrical table and the cone frustum; a horizontal ring surface and an outer arc rotating body which are sequentially connected are arranged at the connected part of the cylindrical inner cavity and the conical inner cavity; the annular groove forms an air inlet cavity; a three-section type Laval gas channel is formed between the first assembly and the second assembly; the first section is a horizontal air inlet retraction section formed by the horizontal ring surfaces of the first assembly and the second assembly; the second section is an arc expansion section formed by the inner arc rotating body of the first assembly and the outer arc rotating body of the second assembly; and the third section is a linear expansion section formed by the cone frustum of the first assembly and the cylindrical inner cavity of the second assembly.

Description

technical field [0001] The invention relates to an atomizing nozzle which uses a supersonic airflow to atomize liquid metal into small liquid droplets and solidify into powder, in particular to a fine metal powder atomizing nozzle from which the metal liquid flows out easily. Background technique [0002] Gas atomization technology is used in the production of metal powder. The principle of powder making is the process of crushing liquid metal flow into small droplets and solidifying into powder with a high-speed airflow. Gas atomized powder has the advantages of high sphericity and controllable powder particle size. [0003] The atomizer is the core of the gas atomization powder making technology, and the atomizer determines the performance and atomization efficiency of the atomized powder. It is the development trend of the atomizer to improve the yield of fine powder (powder with a particle size of less than 45 μm) and the controllability of the powder, and to reduce the...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 陈仕奇
Owner HUNAN HENGJI POWDER TECH
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