Preparation method of high-quality spherical metal powder

A metal powder, high-quality technology, applied in metal processing equipment, additive processing, transportation and packaging, etc., can solve the problems of easy powder aggregation, complex plasma system, system energy consumption, high powder cost, etc., to reduce oxygen content and Effects of other impurity content, improvement of powder spheroidization rate, and high degree of directionality

Pending Publication Date: 2022-04-01
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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AI Technical Summary

Problems solved by technology

[0008] The quality of the spherical powder obtained through the plasma spheroidization technology has been affirmed, but relatively speaking, the plasma system is relatively complicated, and the system energy consumption and powder cost are high, which greatly restricts the development of 3D printing technology
Moreover, there are still some recognized problems in plasma, such as the theoretical mechanism of a series of phenomena in the plasma spheroidization process is not yet clear, the powder is easy to agglomerate during the plasma spheroidization process, and the controllability of plasma energy is not good, etc.

Method used

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  • Preparation method of high-quality spherical metal powder
  • Preparation method of high-quality spherical metal powder
  • Preparation method of high-quality spherical metal powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of metal titanium spherical powder, see figure 1 , including the following steps:

[0033]Step S1: Hydrogen absorption treatment of the raw material powder, that is, the non-spherical metal powder with large particle size is subjected to hydrogenation treatment, followed by crushing and sieving to obtain a metal powder that completely absorbs hydrogen or partially absorbs hydrogen; specifically, in a hydrodehydrogenation furnace Intermediate treatment of sponge titanium particles, the temperature is 600-700 ℃, the hydrogen pressure is 100-200kpa, the hydrogen absorption time is 10-120min, the hydrogenation degree of the powder is controlled by controlling the hydrogen absorption time, so that the titanium powder can completely absorb hydrogen, and then cool down with the furnace; Then mechanically crush the obtained particles, and sieve the irregular titanium hydride powder of 53-75 μm as the raw material powder 5 for laser spheroidization; ...

Embodiment 2

[0038] A preparation method of titanium alloy spherical powder, comprising the steps of:

[0039] Step S1: sieve fully hydrogenated TC4 titanium alloy powder as a raw material, and sieve the powder with a size of 53-75 μm for laser treatment, and the powder shape is irregular (see figure 2 );

[0040] Step S2: Laser spheroidization treatment: The hydrogen-absorbing TC4 titanium alloy powder is uniformly and continuously delivered to the high-energy laser beam through the powder feeding equipment and powder feeding gas (Ar, 99.999%). According to the physical properties of the titanium alloy powder, the powder feeding The gas flow rate is 3-6L / min, the protective gas flow rate is 2-6L / min, and the laser power of 3-6kw is selected to cooperate to melt the titanium alloy powder transported into the laser beam and dehydrogenate it during the heating and melting process. The hydrogen generated by the dehydrogenation breaks the metal powder and forms fine droplets after melting, a...

Embodiment 3

[0046] A preparation method of titanium alloy spherical powder, which is basically the same as that of Example 2, the difference is that the hydrogen absorption degree of TC4 titanium alloy powder is 50%, the spheroidization rate is 85%, and the powder particle size (<53 μm, accounts for 80% ), decreased compared to Example 2.

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Abstract

The invention discloses a preparation method of high-quality spherical powder. The metal powder comprises a metal simple substance or / and a metal alloy capable of absorbing hydrogen and dehydrogenating. The method comprises the steps that metal elementary substance or alloy powder with the hydrogenation degree of 10%-100% is introduced into a laser beam at the powder feeding airflow of 2-10 L / min; in the inert gas atmosphere, by controlling laser power and powder physical properties, common coupling of a laser beam focusing spot and a powder beam convergent point is achieved, and meanwhile powder feeding airflow and protection airflow are regulated and controlled to be matched; under the action of laser energy, the metal elementary substance or alloy powder subjected to hydrogen absorption and hydrogenation is heated to expand, break and dehydrogenate and is quickly melted to form fine molten drops, and the molten drops are spheroidized under the action of surface tension, separated from a heating area and then quickly cooled and solidified to form spherical powder. The spherical powder obtained through the method is good in spheroidizing effect, the one-time spheroidizing rate of the powder exceeds 80%, and the powder is good in sphericity degree, concentrated in particle size distribution, high in fine powder yield and few in impurities.

Description

technical field [0001] The invention relates to a method for preparing a high-quality spherical metal powder, in particular to a method for preparing a hydrogen-absorbing-dehydrogenation metal element or alloy powder to obtain a high-quality spherical metal powder under the action of a laser. Background technique [0002] Metal additive manufacturing (3D printing) is currently one of the most potential development technologies in the field of additive manufacturing. It has significant advantages in the field of complex parts preparation and has received extensive attention and research at home and abroad. Spherical metal powder is used as the raw material for 3D printing, and the quality of the powder determines the quality and dimensional accuracy of the processed parts. Therefore, the preparation of high-quality spherical powder has become an extremely important part of the 3D printing process, and it also limits the development and application of 3D printing technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/02B22F9/08B22F1/065B33Y70/00
Inventor 刘颖王仁全李洞亭张万能高宇潘帅成
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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