Method for lowering powder size and changing powder shape in atomization process of molten metal

A metal melt and atomization process technology, applied in the field of powder metallurgy, can solve the problems of increased energy consumption, difficulty in obtaining flake powder, complicated technology, etc., and achieve the effect of reducing particle size

Inactive Publication Date: 2016-02-03

POCO HLDG CO LTD

5 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The previous technology is to increase the pressure and flow of the atomized fluid, which is achieved by using special nozzles (such as high-pressure nozzles, supersonic nozzles, close-coupled nozzles, etc.), which are complicated in technology and high in energy consumption.

In addition, in the gas atomization process of metal melts, generally only sphe...

Method used

Adopt same pressure and flow nitrogen equally, prepare Sn powder by annular nozzle, the flow rate of molten metal is identical, and the tip hole of leakage nozzle changes 6 holes (Fig. 2a) by a hole in the prior art, and the diameter of each aperture is 2.1mm, the average particle size of the powder after atomization is 44μm. This process greatly reduces the average particle size of Sn powder.

Adopt the nitrogen of same pressure and same flow rate, metal liquid flow rate is 20kg/min, the hole ...

Abstract

The invention provides a method for lowering the powder size and changing the powder shape in the atomization process of molten metal. A discharge spout head is arranged at the position, where the molten metal enters an atomization chamber through a leak tundish, of a discharge spout. The discharge spout head is provided with one or more holes. The molten metal enters the atomization chamber through the holes in the discharge spout head and is beaten and smashed into metal powder through high-pressure gas or high-pressure water. Under the conditions that the pressure or flow or nozzle structure of original fluid is not changed, and the atomization productivity is not changed, only the discharge spout structure of metal liquid is changed, the grain size of metal powder can be effectively reduced, and the average grain size can be reduced to 20-40 micrometers. The method can be used for preparing flaky or elliptical flaky powder or powder in other shapes, and the problem that flaky powder can be obtained through subsequent processing in the prior art is solved.

Technology Topic

TundishMicrometer +7

Image

Examples

Experimental program(4)

Example Embodiment

[0027] Example 1

[0028] Reference figure 1 , An atomizing device for reducing powder particle size and changing powder shape during the atomization of molten metal, comprising an intermediate leaking bag 20 containing the molten metal 10 and an atomizing chamber, the intermediate leaking bag 20 and the atomizing chamber There is a spout 30 that allows the molten metal 10 to enter the atomization chamber from the intermediate leaking bag 20, the spout 30 is provided with a spout head 40, and one or more holes are provided on the spout head 40.

[0029] The hole can be of any shape, such as circular ( figure 2 a), rectangle ( figure 2 b, 2c), cross ( figure 2 d) etc.

[0030] use figure 2 The spout head 40 shown in a changes one hole of the original spout into 2-10 small holes without changing the area of the molten metal flow column, and the diameter of the single-hole metal melt column becomes smaller. Before atomization It is refined by the tip of the nozzle in advance, and the melt column is fully broken by the fluid column during atomization, which greatly reduces the average particle size of the powder. use figure 2 In the tip 40 shown in b, the molten metal column becomes a rectangular parallelepiped with an aspect ratio of (1.5-5):1. After the liquid metal column is crushed, it becomes a flake-like liquid, and after solidification, it becomes a flake-like liquid. Powder and elliptical flake powder. When used figure 2 In the tip 40 shown in c, the powder becomes a tiny flake powder. use figure 2 In the tip 40 shown in d, the powder becomes a special shape powder.

Example Embodiment

[0031] Example 2 Preparation of Sn powder

[0032] Using existing technology to prepare Sn powder, using pressure 1.2Mpa, flow rate 8m 3 /min nitrogen, Sn powder is prepared through a ring-slit nozzle, the hole diameter of the leak nozzle is 5mm, the flow rate of the molten metal is 15Kg/min, and the average particle size of the atomized powder is 80μm.

[0033] The same pressure and flow of nitrogen are also used to prepare Sn powder through the annular slot nozzle. The flow of the molten metal is the same, and the nozzle head hole is changed from one hole in the prior art to six holes figure 2 a) The diameter of each small hole is 2.1mm, and the average particle size of the powder after atomization is 44μm. This process greatly reduces the average particle size of Sn powder.

Example Embodiment

[0034] Example 3 Preparation of stainless steel powder

[0035] The stainless steel powder is prepared by the existing technology, the stainless steel powder is atomized by high-pressure water, the water pressure is 25MPa, the flow rate is 310L/min, the ring hole nozzle is used, the metal liquid flow rate is 20kg/min, the leak nozzle hole is 5.5mm, and the atomized powder is average The particle size is 30 μm.

[0036] Using the same flow rate and the same pressure of high-pressure water, using a ring hole nozzle, the metal liquid flow rate is 20kg/min, the tip hole of the tip is changed from one hole in the prior art to five holes, and the diameter of each small hole is 2.5mm. The average particle size of the powder is 20μm.

PUM

Property	Measurement	Unit
Diameter	<= 3.0	mm

Description & Claims & Application Information

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small particle size

Method for lowering powder size and changing powder shape in atomization process of molten metal

A metal melt and atomization process technology, applied in the field of powder metallurgy, can solve the problems of increased energy consumption, difficulty in obtaining flake powder, complicated technology, etc., and achieve the effect of reducing particle size

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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