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Loop type supersonic nozzle device for atomizing metal gas

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

Inactive Publication Date: 2009-04-15
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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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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  • Loop type supersonic nozzle device for atomizing metal gas
  • Loop type supersonic nozzle device for atomizing metal gas
  • Loop type supersonic nozzle device for atomizing metal gas

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the FeNi30 alloy melt flows out from the diversion nozzle at a temperature of 1650°C. Laval type gas nozzle throat diameter d 2 And outlet diameter d 4The ratio is 1:1.7, stable section L 1 With d 1 The ratio is 1:1, the diameter of the stable section d 1 With d 2 The ratio is 4:1, the length of the contraction section is L 2 With d 1 The ratio is 8:3, the nozzle throat d 3 With d 2 The ratio is 8:1. The angle α is 11°, and the angle β is 11.7°. The atomizing gas is nitrogen, the atomizing pressure is 2.6 MPa, and the pressure in the atomizing chamber is 0.1 MPa. The particle size distribution curve of metal powder is as Figure 5 As shown, the SEM photo of the metal powder is as Figure 6 , 7 Shown. The average particle diameter reached by the powder is 13.1021 μm, 40 wt% is less than 11.4014 μm, 70 wt% is less than 17.2511 μm, and 90 wt% is less than 25.6048 μm.

Embodiment 2

[0039] The material is NiMnCo alloy melt sprayed from a diversion nozzle at a temperature of 1450℃, and the inner diameter of the diversion nozzle is 4.0mm. Laval type gas nozzle throat diameter d 2 And outlet diameter d 4 The ratio is 1:2.5, stable section L 1 With d 1 The ratio is 1:2, the diameter of the stable section d 1 With d 2 The ratio is 4:1, the length of the contraction section is L 2 With d 1 The ratio is 1:1, the nozzle throat d 3 With d 2 The ratio is 8:1. The angle α is 11°, and the angle β is 20°. The atomizing gas is nitrogen, the atomizing pressure is 3.5 MPa, and the pressure in the atomizing chamber is 0.1 MPa. 50wt% of the powder obtained by atomization is less than 10.5μm, 80wt% is less than 17.05μm, and the average particle diameter is 12.06μm.

Embodiment 3

[0041] In this embodiment, the throat diameter d of the Laval gas nozzle 2 And outlet diameter d 4 The ratio is 1:2, stable section L 1 With d 1 The ratio is 1:2, the diameter of the stable section d 1 With d 2 The ratio is 5:1, the length of the contraction section is L 2 With D 1 The ratio is 1:1, the nozzle throat d 3 With d 2 The ratio is 8:1. The angle α is 11°, and the angle β is 11.7°. The atomizing gas is argon, the atomizing pressure is 1.1 MPa, and the pressure in the atomizing chamber is 0.1 MPa. The atomization temperature of Al20Sn1Cu alloy melt is 740℃. 50wt% of the powder obtained by atomization is less than 27.7μm, 80wt% is less than 40.24μm, and the average particle diameter is 30.05μm.

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Abstract

The invention provides an annular ring type supersonic nozzle device used for metal gas atomization, which comprises an inlet pipe (4) connecting an external gas cylinder, wherein the inlet pipe is connected with a nozzle annular air-chamber (1); the center of a nozzle is provided with a central hole (2); a plurality of supersonic gas nozzles (3) are evenly distributed on the chamber wall under the air chamber; each supersonic gas nozzle comprises a stable section, a contraction section, a throat part and a diffusion section; and an extension line of the central line of the gas nozzle and an axial line of the central hole form an included angle alpha. A line segment AB of the stable section is a straight line parallel to the axial line of the nozzle; contraction section BC of the nozzle is a contraction type curve; the throat part CD of the nozzle is a section of circular arc; a segment type line of the extension section DEF consists of a straight line DE and a curve EF; the section of the whole nozzle is a circle; and the profile of the nozzle is a streamline curved surface produced by rotating ABCDEF curves in the nozzle around the axial line of the nozzle. The device has the advantages that the supersonic atomization nozzle with even and uniform air flow and small turbulence scale without compression wave in a flow field can fulfill the technical requirement of quickly solidifying metal atomization; and the prepared metal powder achieves the aim of small granularity and narrow distribution of grain diameter.

Description

Technical field [0001] The invention relates to a nozzle for rapidly solidifying gas atomized metal melt to prepare fine powder, in particular to a supersonic gas atomizing nozzle including a gas flow nozzle. Background technique [0002] In the metal powder industry, gas atomization technology is widely used. Due to its high cooling rate (10 4 ℃ / sec~10 6 ℃ / sec) and supercooling degree, so the preparation of ultrafine spherical metal powder by gas atomization has many attractive characteristics. For example, the powder can effectively reduce the segregation of alloy components through rapid solidification gas atomization and obtain microstructure Fine alloy powder with uniform composition. In addition. By controlling the condensation rate, powders with non-equilibrium structures such as amorphous, quasicrystalline, microcrystalline or supersaturated solid solution can be obtained. It can be widely used in aerospace, electronic information, catalyst powder for synthetic diamond sy...

Claims

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Application Information

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IPC IPC(8): B05B1/34B05B17/06
Inventor 徐骏赵新明朱学新
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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