High-pressure gas atomizing nozzle

A high-pressure gas atomization and nozzle technology, applied in the direction of liquid injection devices, injection devices, etc., can solve the problems of atomization termination, nozzle clogging, coarse powder particle size, etc., achieve particle size refinement, ensure continuity, and increase powder output ratio Effect

Inactive Publication Date: 2005-12-21
ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1282282A describes a rectangular Laval nozzle, which accelerates the atomization of molten metal into fine droplets according to the principle of laminar flow atomization. High metal liquid superheat, and it is easy to cause the metal liquid to be supercooled and cause the nozzle to be blocked, resulting in the phenomenon of atomization termination
Chinese patent CN 1078928A describes a

Method used

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Examples

Experimental program
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Example Embodiment

[0019] Example 1:

[0020] A Laval nozzle throat is such as figure 2 The high-pressure gas atomizing nozzle of the annular slot structure shown, the cross-sectional view is as follows figure 1 As shown, it contains a draft tube 1, which is provided with an air cavity 2 surrounding it, the walls 21a, 21b of the outer cavity wall 21 of the air cavity 2 and the wall surfaces 22a, 22b of the inner cavity wall 22 A Laval nozzle structure 3 is formed near the top of the draft tube 1. The Laval nozzle structure 3 includes a convergent part 31, a throat 32, and a divergent part 33. The outer side of the tube wall near the top of the draft tube 1 is a cone 4 with a cone surface. The extension line of 41 forms an included angle β, the extension line of the inner cavity wall 22b of the air cavity 2 in the divergent part 33 of the Laval nozzle structure 3 forms an included angle θ, and the angle θ is greater than or equal to the angle β, and the divergent part 33 of the Laval nozzle structu...

Example Embodiment

[0027] Example 2:

[0028] A Laval nozzle throat 32 is such as figure 2 The high-pressure gas atomization nozzle of the annular slot structure shown, the angle β=30°, the angle α=40°, the angle δ=10°, L=2mm, the annular slot cross-sectional area is 16mm 2 , The ratio of бe to бt is 5:1, and the central aperture of the draft tube 1 is 4.2mm. The basic composition of the material is Fe70Ni30. Put 21Kg pure iron rod and 9Kg pure nickel plate into the MgO crucible of the atomization furnace. The atomization system is evacuated, and the intermediate frequency power is 90KW for 45min. The charge is melted. The melting point of the charge is about 1480℃. After the furnace temperature rises to 1600°C, pour the liquid into the tundish for atomization. The atomization adopts an atomization pressure of 3.8Mpa, and the gas is high-purity nitrogen. The particle size distribution of the atomized powder is as Figure 6 As shown, 9.2 wt% of the powder obtained by atomization is less than 10 μm, ...

Example Embodiment

[0029] Example 3:

[0030] In this embodiment, a nozzle with a nozzle throat 32 as a ring hole structure is used, which is composed of 20 individual ring holes. Angle β=40°, angle α=30°, angle δ=24°, L=5mm, the ratio of бe to бt is 5:1, the total cross-sectional area of ​​the ring hole is 20mm 2 , The central aperture of the draft tube 1 is 4.5mm. The basic composition of the material is FeSi9.6Al5.4. Put 21.3Kg pure iron and 2.4Kg industrial pure silicon into the crucible of the atomization furnace. The atomization system is evacuated. The medium frequency power is 70KW for 40 minutes. The charge is melted. Add 1.35Kg aluminum in a protective atmosphere and wait for the furnace temperature. The temperature is raised to 1550°C to prepare for atomization, the atomization pressure is 4.5MPa, and the gas is high-purity nitrogen. The particle size distribution of the atomized powder is as Figure 8 As shown, the average particle size of the powder obtained by atomization is 18.8 μm, 3...

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Abstract

The present invention relates to the equipment using gassy pulverization high temperature coulee to make super thin powder, especially heavy-fisted gassy pulverization muzzle. It comprises guiding flow pipe outside which there is gas cavity whose ektexine and wall form Laval spout frame. The ektexine of pipes around the top of guiding flow pipe takes on taper. This invention can be applied to material with pulverization high melting point and the need to liquid's superheat temperature is not high. The air current of high-handed gas pulverizations melting liquid make super thin powder by very kinetic energy. It can not only make the most use of gas energy and make sure of the continuity on craftwork but also slender the powder and improve productivity.

Description

technical field [0001] The invention relates to a device for producing superfine powder by atomizing high-temperature molten liquid with gas, in particular to a high-pressure gas atomizing nozzle. Background technique [0002] Gas atomization of molten metal is a commonly used method for producing metal powder, while conventional gas atomization nozzles are mostly non-constrained nozzles in which molten metal falls freely. The powder particles produced by atomization of such nozzles are very coarse, and the atomization The average particle size of the powder is in the range of 60~75μm. The ultrasonic atomizer (US Patent N.4778516) invented by Professor N.T. Grant of the Massachusetts Institute of Technology uses the principle of the Hartmman ultrasonic oscillator wave tube to generate a jet atomized metal liquid with a frequency of 20~100KHz and a flow rate of Mach 2.5 with a high-pressure gas of 3MPa. . Use this atomizer to reduce the average particle size of the powder t...

Claims

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Application Information

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IPC IPC(8): B05B7/06
Inventor 陈新国
Owner ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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