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Spherical metal powder and preparation method thereof

A metal powder and spherical technology, which is applied in the field of spherical metal powder and its preparation, can solve the problems of powder dependence on the original powder particle size, difficulty in mass production, difficulty in fine powder agglomeration, powder delivery, etc., to achieve narrow particle size distribution, reliable technology, and product particle size easy to control effects

Active Publication Date: 2016-08-17
GUANGZHOU NALIAN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder prepared by plasma spheroidization depends on the particle size of the original powder, and it is difficult to mass produce due to the difficulty of powder feeding due to the agglomeration of fine powder

Method used

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  • Spherical metal powder and preparation method thereof
  • Spherical metal powder and preparation method thereof
  • Spherical metal powder and preparation method thereof

Examples

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Effect test

preparation example Construction

[0042] Such as figure 1 Shown, a kind of preparation method that can prepare the spherical metal powder that particle size is less than 53 μ m and does not contain satellite particle, comprises the following steps:

[0043] S10: heating the metal bar in a heating device until it melts to obtain a molten liquid;

[0044] S20: Using the flame of the plasma device to break the molten liquid into small liquid droplets;

[0045] S30: cooling and solidifying the small droplets, and collecting spherical metal powder.

[0046] Such as figure 2 As shown, the spherical metal powder preparation device according to one embodiment of the method of the present application includes a metal rod 110 , an atomizing tower 120 , a tower neck 130 , a heating device 140 , a conveying device 150 and a plasma device 160 .

[0047] Metal rod 110, one end is tapered; atomization tower 120, has an atomization chamber for atomizing metal rod 110, the two ends of the atomization chamber are respective...

Embodiment 1

[0056] This embodiment is a preparation process of industrial pure titanium powder for 3D printing of spherical metal powder. The gas source 171 is filled with inert gas. Turn on the heating device 140 to heat and make the pure titanium rod melt to form a molten liquid, and adjust the angle between the axis of the plasma flame sent by the plasma device 160 and the axis of the metal rod 110 to be 44°, and the top of the plasma flame of the plasma device 160 is conical with the rod. The end distance is 54mm, the molten liquid falls to the plasma flame of the plasma device 160 and is broken into small droplets, the output power of the plasma device is 14-15KW, the working gas is high-purity argon, and the jet velocity is 850-1000m / s. The argon gas pressure in the atomization tower 120 is kept at 0.3-0.5 MPa, and the small droplets after plasma crushing are cooled and solidified in the argon environment, and collected and taken out after cooling to room temperature. Then use an u...

Embodiment 2

[0060] This embodiment is a preparation process of TC4 titanium alloy powder for spherical metal powder 3D printing. The specific operation is as follows: after removing surface impurities and oxides on the special Ti6Al4V rod with a lathe, put it into the conveying device 150, turn on the inert gas Source 171, filled with inert gas. Turn on the heating device 140 to heat the Ti6Al4V rod to melt to form a melt, adjust the angle between the axis of the plasma flame sent by the plasma device 160 and the axis of the metal rod 110 to be 46 °, the top of the plasma flame of the plasma device 160 and the tapered end of the rod The distance is 50mm, the molten liquid falls to the plasma flame of the plasma device 160 and is broken into small droplets, the output power of the plasma device is 14-15KW, the working gas is high-purity argon, and the jet velocity is 850-1000m / s. The argon gas pressure in the atomization tower 120 is kept at 0.3-0.5 MPa, and the small droplets after plasma...

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Abstract

The invention relates to a preparation method of spherical metal powder. The preparation method comprises the steps of heating a metal bar to melt in a heating device, so as to obtain melted liquid, and breaking the melted liquid into small droplets by using plasma as droplet breakage power, so that the small droplets are cooled and solidified and are collected so as to obtain the spherical metal powder. According to the spherical metal powder prepared by adopting the preparation method, almost no satellite particle exists, the oxygen content is less than 1200 ppm, and the occupancy of the powder below 53 mum reaches 90% according to weight percent; the spherical metal powder has the advantages of high degree of sphericity, narrow particle size distribution, low impurity content, good flowability, low oxygen content, no satellite particle, simple process, reliable technique, easiness in control over product particle size, high production efficiency and low inert gas consumption and is suitable for mass production, and the particle size distribution satisfies the 3D printing requirements.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a spherical metal powder and a preparation method thereof. Background technique [0002] In recent years, since 3D printing technology can directly produce parts with complex shapes, it has been widely developed in aerospace, health care, automobiles, art, architecture and other fields. The 3D printing technology of selective laser sintering and electron beam melting requires metal powders with good sphericity, narrow particle size distribution (particle size distribution between 15 and 53 μm), low oxygen content, and good fluidity. However, domestic research on this type of metal powder has been relatively slow. There are many domestic manufacturers of this type of powder, but they have not fully matched metal 3D printing technology. Many manufacturers use the metal powder used in metal injection molding in selective laser or electron beam. On the fusion equipment, but the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14
CPCB22F9/14B22F1/065
Inventor 李爱红王骏杨金文
Owner GUANGZHOU NALIAN MATERIAL TECH CO LTD
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