Preparation method for fine metal powder and equipment achieving method

A metal powder and fine technology, which is applied in the field of preparation of fine metal powder, can solve the problems of high production cost, huge equipment, high tank body, etc., and achieve the effect of low cost, convenient operation and simple equipment structure

Active Publication Date: 2016-03-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the water atomization method has a large cooling rate and controllable powder particle size, microstructure and shape, but there are many shortcomings: (1) due to the interaction between the molten liquid flow and the water flow, the obtained powder is easy to form oxides, High oxygen content; (2) The shape of the powder is irregular, and it is easy to form ellipsoidal particles
The gas atomization method can prepare powders with high sphericity, but there are the following disadvantages: (1) the powder particle size distribution range is wide, and high-quality amorphous powders with uniform particle sizes cannot be obtained in large quantities; To prevent the high-speed flying droplets from hitting the atomization tank wall before solidification, the vertical arrangement is often adopted, and the tank body is very high; (3) a large amount of inert gas is consumed, and the production cost is high; (4) the continuous preparation time is short, The powder quality is not high enough to meet the requirements of high-quality metal powder materials
However, the problem with this cooling method is that the metal droplets are cooled before they are broken, which is not conducive to the breakage of the droplets into smaller droplets, resulting in a larger particle size of the final powder

Method used

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  • Preparation method for fine metal powder and equipment achieving method
  • Preparation method for fine metal powder and equipment achieving method
  • Preparation method for fine metal powder and equipment achieving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the schematic diagram of the preparation equipment structure of fine metal powder is as follows figure 1 As shown, it includes a melting furnace (not shown in the figure), a crucible 1 , a gas atomization device 3 , a rotary disk 4 and a cooling device 5 .

[0040] The melting furnace communicates with the crucible 1, and the crucible 1 is provided with at least one nozzle 2. After the metal material is melted into a melt in the melting furnace, it is sprayed out by at least one nozzle 2 under a certain pressure. After the melt sprayed out of each nozzle 2 passes through the gas atomization device, the smaller droplets are due to the effect of surface tension. , Condensate and shrink into a spherical powder, relatively large unsolidified or semi-solidified droplets fall down and spray.

[0041] The rotary disk 4 is arranged below the metal droplet, and the surface of the rotary disk is perpendicular to the central axis of the metal droplet falling d...

Embodiment 2

[0052] In this example, the structure of the fine metal powder preparation equipment is exactly the same as the preparation equipment in Example 1, and the method of using this equipment to prepare metal powder is exactly the same as the preparation method in Example 1.

[0053] Using the above equipment to prepare fine copper powder, the main process parameters for control and adjustment are: the heating temperature in the melting furnace is 280°C above the melting point of copper, and the melting process is protected by argon; the gas atomization pressure is 2.5MPa, and the melt The flow rate is 4kg / min; the distance between the nozzle and the rotary disc is 100mm, the diameter of the rotary disc is 600mm, and the rotation speed is 10000 rpm; the cooling water pressure is 1.5MPa.

[0054] The SEM image of the Cu powder prepared according to the above parameters shows that the particle size of the powder is small, the average particle size is 9-12 μm, the sphericity is good, t...

Embodiment 3

[0056] In this example, the structure of the fine metal powder preparation equipment is exactly the same as the preparation equipment in Example 1, and the method of using this equipment to prepare metal powder is exactly the same as the preparation method in Example 1.

[0057] The quasicrystalline powder whose composition is Al-Cu-Fe-Cr-Mn is prepared by using the above-mentioned equipment. The main process parameters to be controlled and adjusted are: the heating temperature in the melting furnace is 200°C for the superheating of the melt, and the melting process is protected by argon; The atomization pressure is 0.8MPa, the melt flow rate during atomization is 3kg / min; the distance between the nozzle and the lower rotary disc is 80mm, the diameter of the rotary disc is 600mm, and the rotation speed is 10000 rpm; the cooling water pressure is 1.5 MPa.

[0058] The SEM image of the Al-Cu-Fe-Cr-Mn quasicrystalline powder prepared according to the above parameters shows that t...

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Abstract

The invention provides a preparation method for fine metal powder and equipment achieving the method. On the one hand, metal materials are fused and atomized into liquid drops to be sprayed to a high-speed rotation disc and smashed into small liquid drops, and the center spraying axis of the liquid drops is perpendicular to the rotation disc face; on the other hand, the liquid drops sprayed to the high-speed rotation disc are cooled after being smashed, and the metal powder is obtained. Compared with the prior art, the metal powder prepared through the method is fine in grain size, good in degree of sphericity and narrow in grain size distribution range and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation, in particular to a method for preparing fine metal powder and equipment for realizing the method. Background technique [0002] As a kind of powder material, the high-performance functional powder material itself has certain physical and chemical characteristics, such as excellent mechanical properties, special magnetic properties, high electrical conductivity and diffusivity, high reactivity and catalytic properties, and electromagnetic wave absorption. In addition, the characteristics of powder materials: small particle size, large specific surface area, and many properties different from conventional materials can effectively improve the performance of materials and reduce production costs, so that high-performance functional powder materials are gradually being widely used. , especially in the context of global resource and energy shortages, all kinds of high-tech products ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10
Inventor 董亚强常春涛满其奎黎嘉威李润伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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