Circumferential seam type supersonic nozzle for metal gas atomization

A technology of supersonic nozzle and gas atomization, which is applied in liquid injection devices, injection devices, etc., can solve the problems of gas energy loss, the existence of shock waves, and large turbulence, so as to reduce energy loss and turbulence, reduce effect of chance

Active Publication Date: 2012-07-18
有研增材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be known from the aerodynamic analysis that the airflow generated by this structure does not reach the throat uniformly, the degree of turbulence is high, and there are shock waves in the flow field, resulting in energy loss of the gas.

Method used

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  • Circumferential seam type supersonic nozzle for metal gas atomization
  • Circumferential seam type supersonic nozzle for metal gas atomization
  • Circumferential seam type supersonic nozzle for metal gas atomization

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, the FeNi30 alloy melt flows out of the nozzle at a temperature of 1650°C. The ratio of the throat slit width c of the gas nozzle to the exit slit width d is 1:1.7, and the stable section L 1 The ratio to a is 1:1, the ratio of the stable section a to the throat c is 5:1, and the length of the contraction section is L 2 The ratio to b is 1:2, and the angle α is 15°. The atomizing gas is nitrogen, the atomizing pressure is 4.0MPa, and the pressure in the atomizing chamber is 0.1MPa. The particle size distribution curve of the metal powder is as follows Figure 5 As shown, the SEM photo of the metal powder is as follows Image 6 shown. The average particle diameter of the produced powder is 27.1 μm, 10 wt% is less than 11.2 μm, and 90 wt% is less than 60.6 μm.

Embodiment 2

[0046] The material is 17-4PH stainless steel melt, which is sprayed from the diversion nozzle at a temperature of 1600°C, and the inner diameter of the diversion nozzle is 4.0mm. The ratio of the throat slit width c of the gas nozzle to the exit slit width d is 1:3, and the stable section L 1 The ratio to a is 1:2, the ratio of the stable section a to the throat c is 4:1, and the length of the contraction section is L 2 The ratio to b is 1:2, and the angle α is 20°. The atomizing gas is nitrogen, the atomizing pressure is 3.5MPa, and the pressure in the atomizing chamber is 0.1MPa. The SEM photo of 17-4PH stainless steel powder is as follows Figure 7 shown. The powder achieved an average particle diameter of 22.1 μm, with 16 wt% smaller than 9.1 μm and 84 wt% smaller than 41.7 μm.

Embodiment 3

[0048] In this embodiment, the ratio of the throat slit width c of the gas nozzle to the exit slit width d is 1:2, and the stable section L 1 The ratio to a is 1:2, the ratio of the stable section a to the throat c is 5:1, and the length of the contraction section is L 2 The ratio to b is 1:2, and the angle α is 20°. The atomization gas is argon, the atomization pressure is 2.0MPa, and the pressure in the atomization chamber is 0.1MPa. The atomization temperature of CuSn20 alloy melt is 1200℃. The SEM photo of CuSn20 powder is as Figure 8 shown. 10 wt% of the atomized powder is less than 5.6 μm, 90 wt% is less than 25.2 μm, and the average diameter D50 is 13.6 μm.

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Abstract

A circumferential seam type supersonic nozzle for metal gas atomization comprises a gas inlet pipe (4) connected with an external gas bottle. The gas inlet pipe is connected with an annular gas chamber (1) of the nozzle, the center of the nozzle is provided with a central hole (2), a supersonic gas spray pipe (3) of a circumferential seam structure is formed on the inner chamber wall and the outer chamber wall below the gas chamber and comprises stabilizing sections, contracting sections, throats and diffusion sections, a seam profile consists of symmetric curves, the profile of the whole spray pipe is the seam profile formed by the curves AB, BC and CD to take the axis of central hole (2) as the symmetry axis, the profile rotates by 360 degrees around the axis of the central hole (2) so that a curved surface is obtained, and an included angle alpha ranging from 0 degree to 6 degrees but not equal to 0 degree is formed by an extension line of a central line of each seam passage and the axis of the central hole of the nozzle in the profile of the gas spray pipe (3) passing through the axis of the central hole of the nozzle. The supersonic nozzle for gas atomization has the advantages that gas flow is uniform, turbulence level is low, and shock waves are absent in a flow field.

Description

technical field [0001] The invention relates to a nozzle for rapidly solidifying gas to atomize metal melt to prepare fine powder, in particular to a supersonic annular slot gas atomizing nozzle including a special airflow profile. Background technique [0002] In the industry of preparing metal powders, gas atomization technology has become one of the main methods to produce high-performance metal powders. Due to its high cooling rate (10 4 ℃ / s~10 6 ℃ / s) and supercooling degree, so the preparation of ultrafine spherical metal powder by gas atomization has many attractive characteristics, for example, it can effectively reduce the segregation of alloy components, and obtain alloy powder with fine microstructure and uniform composition . In addition, powders with non-equilibrium structures such as amorphous, quasicrystalline, microcrystalline or supersaturated solid solutions can be obtained by controlling the condensation rate. It is widely used in high-tech fields such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B05B7/06
Inventor 赵新明徐骏朱学新张少明
Owner 有研增材技术有限公司
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