Method for preparing superfine spherical aluminum powder by high-pressure atomization

A high-pressure atomization and spherical aluminum powder technology, which is applied in the field of aluminum powder preparation, can solve the problems of low yield of fine spherical aluminum powder, wide powder size distribution, and limited application range, etc., and achieve small grain size and good sphericity , the effect of low control difficulty

Active Publication Date: 2020-09-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcomings of this preparation process are: low atomization efficiency, low yield of fine spherical aluminum powder, large aluminum powder particle size and low activity, and long condensation time lead to wide powder size distribution, which limits its pra

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  • Method for preparing superfine spherical aluminum powder by high-pressure atomization
  • Method for preparing superfine spherical aluminum powder by high-pressure atomization
  • Method for preparing superfine spherical aluminum powder by high-pressure atomization

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The method for preparing fine spherical aluminum powder by high-pressure atomization:

[0052] S1. Melting: Under the protection of a mixed gas of nitrogen and helium (volume ratio: 90%:10%), the aluminum ingot is heated to 850°C in a smelting furnace, melted into molten aluminum, and continues to heat to maintain the aluminum The liquid temperature was 800°C.

[0053] S2. High-pressure atomization: The aluminum liquid obtained in step S1 is transported through the aluminum liquid catheter to the atomization chamber with nitrogen-helium mixed gas as the ambient gas, and sprayed out at a flow rate of 400Kg / h. At the same time, the mixed gas pretreated by compression and heating is sent into the tightly coupled annular gap gas atomization nozzle (such as figure 2 As shown, the protruding length of the nozzle is 3mm), and the preheating temperature is 400°C, and the atomization pressure is 3.0MPa. 3 / h flow rate, the atomization process is carried out, and the aluminum ...

Embodiment 2-6

[0064] The difference from Example 1: in the mixed gas, the volume ratio of nitrogen and helium is set differently, and other steps are the same as those in Example 1, and will not be repeated here.

[0065]

[0066]

[0067] see image 3 As shown, compared with the effect of pure nitrogen medium atomization powder making in Comparative Example 1, the aluminum powder prepared by atomization of nitrogen helium inert mixed gas provided by the present invention has higher fine powder yield and smaller average particle size, and the spherical structure is better.

[0068] This is mainly because the density of helium is lower than that of nitrogen, and it can achieve a higher jet velocity under the same pressure. At the same time, due to the special physical characteristics of helium, its cooling effect is better than that of nitrogen. Therefore, under the nitrogen-helium mixed atomization condition, the atomization ejection speed of the mixed gas is faster, and the temperat...

Embodiment 5-10

[0073] The difference from Example 1: the settings of atomization pressure and preheating temperature are different, and other steps are the same as in Example 1, which will not be repeated here.

[0074] Example Atomization pressure / MPa Preheating temperature / ℃ Average particle size / μm -20μm fine powder rate / % Example 1 3.0 400 13.8 89 Example 5 4.0 400 12.8 91 Example 6 6.0 400 9.8 94 Example 7 8.0 400 8.3 96 Example 8 3.0 350 14.0 86 Example 9 3.0 600 13.4 90 Example 10 3.0 800 12.8 87 Comparative example 3 3.0 / 18.5 72

[0075] see Figure 4 As shown, the higher the atomization pressure, the greater the outlet velocity of the atomized gas. When the aluminum liquid flow rate is constant, the high-pressure energy acting on the unit aluminum liquid melt is greater, and the impact on the aluminum liquid is intensified, so that the melt The relative displacement of the inner and outer...

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Abstract

The invention provides a method for preparing a superfine spherical aluminum powder by high-pressure atomization. Firstly, under the protection of the mixed gas of nitrogen and helium, aluminum ingotsare heated and melted in a melting furnace to become aluminum liquid and warm is kept; then the obtained aluminum liquid is transported through an aluminum liquid catheter to an atomization chamber where the above mixed gas is used as the ambient gas, and meanwhile, the mixed gas is sprayed out through a tightly coupled gas atomization nozzle to atomize the aluminum liquid to form mist-like aluminum liquid droplets; then the liquid aluminum droplets are cooled and rapidly solidified under the cooling and protection of the ambient gas to form atomized aluminum powder; and then the mixed gas isused as a transmission medium, and the atomized aluminum powder is sent to a grading system for graded screening treatment to obtain the superfine spherical aluminum powders of different particle sizes. The method for preparing the superfine spherical aluminum powder by high-pressure atomization provided by the invention uses the mixed gas of nitrogen and helium as the atomization medium, and hasthe advantages of high atomization efficiency, high fine powder yield, uniform particle size distribution, good aluminum powder sphericity and uniform size.

Description

technical field [0001] The invention relates to a method for preparing aluminum powder, in particular to a method for preparing fine spherical aluminum powder by high-pressure atomization. Background technique [0002] Aluminum powder is an important metal powder material, which is widely used in chemical industry, coating, refractory material, aluminothermic alloy, thermal spray composite powder, gunpowder, solid rocket propellant and other fields, and plays an important role in construction and national defense industry. [0003] As the mainstream aluminum powder preparation technology, the atomization method has a wide range of productivity and can produce a variety of spherical powders with different particle sizes according to market demand. The process of atomization pulverization is actually a process of diverging molten metal by ejection and atomization. The Venturi effect of high-pressure nitrogen through the atomizer creates a vacuum in the nozzle area, and the mo...

Claims

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Application Information

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IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0824B22F2009/084B22F2009/0844
Inventor 周建安王怡裴培炎付晓晨王宝成日金
Owner WUHAN UNIV OF SCI & TECH
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