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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 self-priming supersonic annular jet atomizer, which uses vortex airflow to atomize the liquid. The feature of this invention is that the atomization melting point Lower metal liquid (lead, tin, aluminum and other materials), but the particle size of the powder atomized by this device is relatively coarse, and it is not suitable for atomizing high melting point metal materials (melting point above 1000 ℃)

Method used

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Embodiment 1

[0020] A Laval nozzle throat is such as figure 2 The high-pressure gas atomizing nozzle with the annular gap structure shown, its cross-sectional view is as follows figure 1 As shown, it includes a guide tube 1, the guide tube 1 is provided with an air cavity 2 surrounding it, the wall surfaces 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 converging portion 31, a throat 32, and a divergent portion 33. The outside of the tube wall near the top of the draft tube 1 is conical 4, and its conical surface The extension line of 41 forms an included angle β, and the extension line of the inner cavity wall surface 22b of the air chamber 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 ...

Embodiment 2

[0028] A kind of Laval nozzle throat 32 is such as figure 2 For the high-pressure gas atomizing nozzle with circular seam structure shown, the angle β=30°, the angle α=40°, the angle δ=10°, L=2mm, and the cross-sectional area of ​​the annular seam is 16mm 2 , The ratio of бe to бt is 5:1, and the central aperture of the guide tube 1 is 4.2mm. The basic composition of the material is Fe70Ni30. Add 21Kg of pure iron rod and 9Kg of pure nickel plate into the MgO crucible of the atomization furnace. The atomization system is evacuated, and the intermediate frequency power supply is 90KW for 45min. When the furnace temperature rises to 1600°C, pour the liquid into the tundish for atomization. The atomization adopts the atomization pressure of 3.8Mpa, and the gas is high-purity nitrogen. The particle size distribution of atomized powder is as follows: Figure 6 As shown, 9.2wt% of the atomized powder is less than 10 μm, 31.2wt% is less than 20 μm, and 76.3wt% is less than 40 μm....

Embodiment 3

[0030] In this embodiment, the nozzle with the throat 32 of the nozzle as an annular hole structure is adopted, which is composed of 20 individual annular holes. Angle β=40°, angle α=30°, angle δ=24°, L=5mm, the ratio of бe to бt is 5:1, and the total cross-sectional area of ​​the ring hole is 20mm 2 , The central aperture of the guide tube 1 is 4.5mm. The basic composition of the material is FeSi9.6Al5.4. Put 21.3Kg of pure iron and 2.4Kg of industrial pure silicon into the crucible of the atomization furnace. The atomization system is vacuumed, and the intermediate frequency power supply is 70KW. After 40 minutes, the charge is melted, and 1.35Kg of aluminum is added in a protective atmosphere. Rise 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 atomized powder is as follows: Figure 8 As shown, the average particle size of the atomized powder is 18.8 μm, 31.6 wt% is less tha...

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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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