High-performance powder metallurgy metal material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of alloys, and particularly discloses a high-performance powder metallurgy metal material, a preparation method and application thereof. A preparation method of a high-performance powder metallurgy metal material comprises the steps that argon serves as a fluidizing medium, metallurgical metal powder continuously collides, rubs and shears with powder particles and the wall of a fluidized bed reactor in the fluidized bed reactor, and primary edge and corner polishing is achieved; then, the metallurgical metal powder and the spherical tungsten steel are jointly fluidized, the metallurgical metal powder and the spherical tungsten steel are continuously collided, rubbed and sheared, further edge and corner grinding is achieved, finally, sound waves moving up and down are increased, adhesion aggregates among the metallurgical metal powder are decomposed, the fluidization quality is improved, and the metallurgical metal powder and the spherical tungsten steel are uniformly mixed. And the high-performance powder metallurgy metal material with high roundness is obtained, and basically no adhesion exists among particles. The prepared high-performance powder metallurgy metal material is high in roundness, good in fluidity, low in oxygen content, high in tap density and capable of being used for additive manufacturing.

Description

Technical Field

[0001] The invention belongs to the technical field of alloys, and in particular relates to a high-performance powder metallurgy metal material, a preparation method and application thereof. Background Art

[0002] SS-430L powder is a low-carbon ferritic stainless steel powder with good corrosion resistance, high-temperature oxidation resistance and moderate strength. It has the following advantages in the field of additive manufacturing: (1) Composition characteristics: low carbon content (carbon content ≤ 0.03%), which further reduces the risk of pores and cracks in the cladding layer and ensures the formation of a dense and uniform structure during the additive manufacturing process. (2) Good corrosion resistance: It has the characteristics of acid and alkali corrosion resistance and oxidation resistance, and can work stably for a long time in high temperature, high humidity or salt spray environment, so that the manufactured parts can be used in harsh environments.

[0003] There are relatively strict requirements on the shape and particle size of metal powder in additive manufacturing. In most additive manufacturing technologies, such as selective laser melting and electron beam melting, metal powder with high sphericity is expected to be used. This is because spherical powder has good fluidity and can be spread evenly during the powder spreading process to ensure the uniformity of the thickness of the powder layer, which is conducive to improving the precision and surface quality of additively manufactured parts. In addition, spherical powder is heated more evenly under the action of laser or electron beam, which can better realize the melting and solidification process and reduce the generation of defects. The smooth surface of the powder can reduce the friction and agglomeration between particles, further improve the fluidity and spreadability of the powder; at the same time, the smooth surface helps to form a good metallurgical bond during the melting process, and improve the density and mechanical properties of the parts. Additive manufacturing usually requires the use of metal powder with a narrow particle size distribution, which can ensure the consistency of the powder during the melting process. If the particle size distribution is too wide, small particles of powder may be over-melted under the action of laser or electron beam, while large particles of powder may not be completely melted, resulting in defects such as pores and cracks inside the parts.

[0004] SS-430L powder is usually prepared by mechanical ball milling, water atomization, gas atomization and other methods. Mechanical ball milling is relatively simple to operate and has low cost, but it has problems such as irregular powder shape, easy pollution during ball milling, and low production efficiency. The gas atomization method has the advantages of high powder sphericity and low oxygen content, but it has high cost and low production efficiency; the water mist method is used to prepare SS-430L powder, which has the characteristics of low cost, high purity, excellent microstructure, environmental protection, and controllable particle size, but it has the disadvantage of irregular powder shape. Summary of the invention

[0005] In view of the above problems, the present invention proposes a high-performance powder metallurgy metal material, a preparation method and an application thereof, which effectively solves the problem of irregular sphericity of metallurgical metal powders on the basis of water atomization.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for preparing a high-performance powder metallurgy metal material, comprising the following steps: S1, preparing metallurgical metal powder by a water mist method; S2, primary fluidization: adding metallurgical metal powder to a fluidized bed reactor under an argon atmosphere at 400-420°C; then adjusting the argon gas flow rate to 0.6-0.8L / min, fluidizing, and maintaining for 10-12min; S3, secondary fluidization: adjusting the argon gas flow rate to 1.2-1.5L / min, cooling to 200-250°C, adding an auxiliary agent to the fluidized bed reactor, turning on a magnetic field generating device, The fluidized bed reactor is fluidized by the magnetic field for 15-20 minutes, the magnetic field generating device is turned off, and the auxiliary agent is removed; S4, three-stage fluidization: the argon gas flow rate is adjusted to 0.8-1.0L / min, the temperature is adjusted to 250-300°C, the sound field generating device is started, the fluidized bed reactor is fluidized by the sound field for 20-30 minutes, and the sound field generating device is turned off; S5, the heat source is turned off, the argon gas flow rate is adjusted to 0.2-0.3L / min, and the temperature is cooled to room temperature, and the metallurgical metal powder after fluidization is collected, which is the high-performance powder metallurgy metal material.

[0007] By adopting the above technical scheme, argon gas is used as the fluidizing medium, and the metallurgical metal powder continuously performs reciprocating circulation in the fluidized bed reactor, and the metallurgical metal powder continuously collides, rubs and shears with the powder particles themselves and the wall of the fluidized bed reactor, thereby achieving preliminary edge grinding; then the metallurgical metal powder and the spherical tungsten steel auxiliary agent are fluidized together, and the metallurgical metal powder and the spherical tungsten steel auxiliary agent also continuously collide, rub and shear, thereby achieving further edge grinding, and finally, the up and down moving sound waves are added to decompose the adherent agglomerates between the metallurgical metal powders, improve the fluidization quality, and obtain a high-performance powder metallurgy metal material powder with higher roundness, and there is basically no adhesion between the particles.

[0008] Furthermore, the metallurgical metal powder is SS-430L ferritic stainless steel powder; the average particle size of the SS-430L ferritic stainless steel powder is 20-24 μm.

[0009] By adopting the above technical solution, although the metallurgical metal powder prepared by the water mist method has many edges and corners, low sphericity, poor fluidity, and is difficult to be directly used in additive manufacturing, it is low in price and can save costs.

[0010] Furthermore, the auxiliary agent is spherical tungsten steel, and the particle size of the spherical tungsten steel is 26-28μm.

[0011] Furthermore, the mass ratio of the auxiliary agent to the metallurgical metal powder is (10-20): (80-90).

[0012] Furthermore, the magnetic field generating device is composed of a voltage-stabilized power supply and a Helmholtz coil, the Helmholtz coil is movably sleeved on the fluidized bed reactor, and the magnetic direction generated by the voltage-stabilized power supply is downward and parallel to the radial direction of the fluidized bed.

[0013] Furthermore, the magnetic field strength generated by the magnetic field generating device is 4.21-4.53 mT.

[0014] By adopting the above technical solution, under the above magnetic field strength and argon flow rate, the spherical tungsten steel auxiliary agent of the particle size is fluidized together with the metallurgical metal powder, and continuously moves in the fluidized bed reactor. At the same time, the spherical tungsten steel auxiliary agent is more conducive to the grinding of small edges and corners of the metallurgical metal powder. At this ratio, the metallurgical metal powder can more fully collide, rub and shear with the spherical tungsten steel auxiliary agent, thereby further improving the roundness of the spherical tungsten steel auxiliary agent.

[0015] Furthermore, the method for removing the auxiliary agent is: use a magnet ring to be movably mounted on the outside of the fluidized bed reactor, so that the metallurgical metal powder is fixed by the magnet, and then the auxiliary agent is poured out from the outlet, and then the outlet is closed and the magnet ring is removed.

[0016] By adopting the above technical solution, the metallurgical metal powder is fixed to the side wall of the fluidized bed reactor by magnetic force, which facilitates the removal of auxiliary agents and is beneficial to the subsequent tertiary fluidization.

[0017] Furthermore, the sound field generating device includes a digital signal generator, a power amplifier and a speaker, and the speaker is located on the top of the fluidized bed reactor; the sound wave frequency is 200-360Hz, and the sound pressure level generated in the fluidized bed reactor is equal to 150-185dB.

[0018] By adopting the above technical solution, the adhered agglomerates between metallurgical metal powders are fluidized and decomposed under the conditions of sound waves, gravity and argon gas flow rate, thereby improving the fluidization quality.

[0019] In a second aspect, the present invention provides a high-performance powder metallurgy metal material prepared by the above-mentioned method for preparing the high-performance powder metallurgy metal material.

[0020] In a third aspect, the present invention provides an application of a high-performance powder metallurgy metal material, and the prepared high-performance powder metallurgy metal material can be used for additive manufacturing.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a triple fluidization process based on water atomization to modify metallurgical metal powder with poor original performance into a high-performance powder metallurgy metal material that can be used for additive manufacturing and has high roundness, good fluidity, low oxygen content and high tap density.

[0022] 2. In the present application, argon is preferably used as the fluidizing medium. The metallurgical metal powder is continuously subjected to reciprocating circulation in the fluidized bed reactor, and the powder particles themselves and the wall of the fluidized bed reactor are continuously collided, rubbed and sheared, thereby achieving preliminary edge grinding. Then, the metallurgical metal powder and the spherical tungsten steel auxiliary agent are fluidized together, and the metallurgical metal powder and the spherical tungsten steel auxiliary agent are also continuously collided, rubbed and sheared, thereby achieving further edge grinding. Finally, the up and down moving sound waves are added to decompose the adhered agglomerates between the metallurgical metal powders, improve the fluidization quality, and obtain a high-performance powder metallurgy metal material powder with a higher roundness, and there is basically no adhesion between the particles.

[0023] 3. The high-performance powder metallurgy metal material prepared by the preparation method of the present application has high roundness, good fluidity, low oxygen content, high tap density, and can be used for additive manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The scanning electron microscope morphology images of the high-performance powder metallurgy metal materials prepared in this application, wherein (a) is the metallurgical metal powder prepared by the water mist method; (b) is the comparative example 1; (c) is the comparative example 2; (d) is the comparative example 3; (e) is the embodiment 1; Figure 2 This is a schematic diagram of the process flow of a two-stage fluidization device for high-performance powder metallurgy metal materials for this application; Figure 3 This is a schematic diagram of the process flow of a three-stage fluidization device for high-performance powder metallurgy metal materials in this application; In the figure: 1. Reactor; 11. Feed inlet; 12. Discharge outlet; 13. Air inlet; 14. Air outlet; 15. Heating plate; 16. Temperature controller; 17. Air flow controller; 18. Fluidized bed; 21. Helmholtz coil; 22. Voltage stabilizer; 31. Speaker; 32. Power amplifier; 33. Digital signal generator. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1 A method for preparing a high-performance powder metallurgy metal material comprises the following steps: S1, preparing metallurgical metal powder by water mist method: molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 20 μm; S2, primary fluidization: heating to 400°C at a rate of 10°C / min. Argon was introduced, and 400 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.6 L / min, and fluidization was performed and maintained for 10 min; S3, secondary fluidization: adjust the argon gas flow rate of the fluidized bed reactor to 1.2 L / min, cool to 200°C, add 50 g of spherical tungsten steel auxiliary agent with an average particle size of 26 μm to the fluidized bed reactor, turn on the magnetic field generating device, and fluidize the auxiliary agent and metallurgical metal powder in the fluidized bed reactor under the action of the magnetic field. Keep for 15 minutes, turn off the magnetic field generating device, adjust the argon gas flow rate to 0.4 L / min, cool to room temperature, use the magnet ring to move and set it on the outside of the fluidized bed reactor, so that the metallurgical metal powder is fixed by the magnet, and then pour the auxiliary agent from the outlet, then close the outlet, and remove the magnet ring; S4, three-stage fluidization: the temperature of the fluidized bed reactor is adjusted to 250°C, the argon gas flow rate is adjusted to 0.8 L / min, the acoustic field generator is started, the fluidized bed reactor is fluidized under the action of the acoustic field, maintained for 20 minutes, and the acoustic field generator is turned off; S5, turn off the heat source, adjust the argon gas flow rate to 0.2L / min, cool to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0027] like Figure 2 As shown, the fluidized bed reactor includes a heating plate 15, a temperature controller 16, a reactor 1, a fluidized bed 18, an air inlet 13, an air outlet 14, a feed port 11, a discharge port 12 and an air flow controller 17; the inner diameter of the reactor bed is 0.25m and the height is 1.65m.

[0028] The magnetic field generating device comprises a voltage-stabilized power supply 22 and a Helmholtz coil 21. The Helmholtz coil 21 is movably mounted on the fluidized bed reactor. The magnetic direction generated by the voltage-stabilized power supply 22 is downward and parallel to the radial direction of the fluidized bed. The magnetic field strength generated by the magnetic field generating device is 4.21 mT.

[0029] like Figure 3As shown, the sound field generating device includes a digital signal generator 33, a power amplifier 32 and a speaker 31, and the speaker 31 is located at the top of the fluidized bed reactor; the sound wave frequency is 200 Hz, and the sound pressure level generated in the fluidized bed reactor is equal to 150 dB.

[0030] The magnet ring is movably sleeved outside the fluidized bed reactor, and the magnetic direction is perpendicular to the radial direction of the fluidized bed, so that metallurgical metal powder can be adsorbed on the inner wall of the fluidized bed reactor.

[0031] Example 2 A method for preparing a high-performance powder metallurgy metal material comprises the following steps: S1, preparing metallurgical metal powder by water mist method: the molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 22 μm; S2, primary fluidization: the temperature was raised to 410°C at a rate of 10°C / min. Argon was introduced, and 425 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.7 L / min, and fluidization was performed and maintained for 11 minutes; S3, secondary fluidization: adjust the argon gas flow rate of the fluidized bed reactor to 1.35 L / min, cool to 230°C, add 75 g of spherical tungsten steel auxiliary agent with an average particle size of 27 μm to the fluidized bed reactor, turn on the magnetic field generator, and fluidize the auxiliary agent and metallurgical metal powder in the fluidized bed reactor under the action of the magnetic field for 18 minutes, turn off the magnetic field generator, adjust the argon gas flow rate to 0.45 L / min, cool to room temperature, use the magnet ring to move and set it on the outside of the fluidized bed reactor, so that the metallurgical metal powder is fixed by the magnet, and then pour the auxiliary agent from the outlet, then close the outlet, and remove the magnet ring; S4, three-stage fluidization: the temperature of the fluidized bed reactor is adjusted to 280°C, the argon gas flow rate is adjusted to 0.9 L / min, the acoustic field generator is started, the fluidized bed reactor is fluidized under the action of the acoustic field, maintained for 25 minutes, and the acoustic field generator is turned off; S5, turn off the heat source, adjust the argon gas flow rate to 0.25L / min, cool to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0032] Example 3 A method for preparing a high-performance powder metallurgy metal material comprises the following steps: S1, preparing metallurgical metal powder by water mist method: molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 24 μm; S2, primary fluidization: the temperature was raised to 420°C at a rate of 10°C / min. Argon was introduced, and 450 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.8 L / min, and fluidization was performed and maintained for 12 min; S3, secondary fluidization: adjust the argon gas flow rate of the fluidized bed reactor to 1.5 L / min, cool to 250°C, add 100 g of spherical tungsten steel auxiliary agent with an average particle size of 28 μm to the fluidized bed reactor, turn on the magnetic field generating device, and fluidize the auxiliary agent and metallurgical metal powder in the fluidized bed reactor under the action of the magnetic field. Keep for 20 minutes, turn off the magnetic field generating device, adjust the argon gas flow rate to 0.5 L / min, cool to room temperature, use the magnet ring to move and set it on the outside of the fluidized bed reactor, so that the metallurgical metal powder is fixed by the magnet, and then pour the auxiliary agent from the outlet, then close the outlet, and then remove the magnet ring; S4, three-stage fluidization: the temperature of the fluidized bed reactor is adjusted to 300°C, the argon gas flow rate is adjusted to 1.0 L / min, the acoustic field generating device is started, the fluidized bed reactor is fluidized under the acoustic field, maintained for 30 minutes, and the acoustic field generating device is turned off; S5, turn off the heat source, adjust the argon gas flow rate to 0.3L / min, cool to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0033] Comparative Example 1 The same as Example 1, except that only one-stage fluidization is performed to obtain a high-performance powder metallurgy metal material. The specific steps are: S1, preparing metallurgical metal powder by water mist method: molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 20 μm; S2, primary fluidization: heating to 400°C at a rate of 10°C / min. Argon was introduced, and 400 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.6 L / min, and fluidization was performed and maintained for 10 min; S3, turn off the heat source, adjust the argon gas flow rate to 0.2L / min, drop to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0034] Comparative Example 2 The same as Example 1, except that high-performance powder metallurgy metal materials are obtained by only primary fluidization and secondary fluidization. The specific steps are: S1, preparing metallurgical metal powder by water mist method: molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 20 μm; S2, primary fluidization: heating to 400°C at a rate of 10°C / min. Argon was introduced, and 400 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.6 L / min, and fluidization was performed and maintained for 10 min; S3, secondary fluidization: adjust the argon gas flow rate of the fluidized bed reactor to 1.2 L / min, cool to 200°C, add 50 g of spherical tungsten steel auxiliary agent with an average particle size of 26 μm to the fluidized bed reactor, turn on the magnetic field generating device, and fluidize the auxiliary agent and metallurgical metal powder in the fluidized bed reactor under the action of the magnetic field. Keep for 15 minutes, turn off the magnetic field generating device, adjust the argon gas flow rate to 0.2 L / min, cool to room temperature, use the magnet ring to move and set it on the outside of the fluidized bed reactor, so that the metallurgical metal powder is fixed by the magnet, and then pour the auxiliary agent from the outlet, then close the outlet, and remove the magnet ring; S4, turn off the heat source, adjust the argon gas flow rate to 0.2L / min, drop to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0035] Comparative Example 3 The same as Example 1, except that high-performance powder metallurgy metal materials are obtained by only one-stage fluidization and three-stage fluidization. The specific steps are: S1, preparing metallurgical metal powder by water mist method: molten SS-430L ferritic stainless steel liquid flow is crushed into fine droplets by high-pressure water impact, and the droplets are rapidly cooled and solidified into powder in water to obtain metallurgical metal powder; the average particle size of the prepared metallurgical metal powder is 20 μm; S2, primary fluidization: heating to 400°C at a rate of 10°C / min. Argon was introduced, and 400 g of metallurgical metal powder was added to the fluidized bed reactor under argon atmosphere; then the argon gas flow rate was adjusted to 0.6 L / min, and fluidization was performed and maintained for 10 min; S3, three-stage fluidization: the temperature of the fluidized bed reactor is adjusted to 250°C, the argon gas flow rate is adjusted to 0.8 L / min, the acoustic field generator is started, the fluidized bed reactor is fluidized under the action of the acoustic field, maintained for 20 minutes, and the acoustic field generator is turned off; S4, turn off the heat source, adjust the argon gas flow rate to 0.2L / min, drop to room temperature, and collect the fluidized metallurgical metal powder, which is the high-performance powder metallurgy metal material.

[0036] Performance testing The morphology of the high performance powder metallurgy metal materials prepared in Example 1 and Comparative Examples 1 to 3 was characterized by scanning electron microscopy. Figure 1 .from Figure 1 It can be seen that the morphology of the high-performance powder metallurgy metal material prepared by the water mist method is extremely irregular, with a large number of edges and corners, and a large number of large particles are attached to the surface of fine powder; the morphology of the high-performance powder metallurgy metal material obtained by only the primary fluidization in Comparative Example 1 is improved, the surface smoothness and sphericity are improved, and the edges and corners are reduced. This may be that the high-performance powder metallurgy metal material is in the primary fluidization stage. Under the joint action of the airflow and gravity from bottom to top, the high-performance powder metallurgy metal material continuously reciprocates in the reactor, and continuously collides, rubs and shears with the powder particles and the reactor wall, thereby achieving preliminary edge grinding. The morphology of the high-performance powder metallurgy metal material obtained by only the primary fluidization and the secondary fluidization in Comparative Example 2 is further improved. This may be because the high-performance powder metallurgy metal material is subjected to secondary fluidization on the basis of the primary fluidization, and is continuously moved in the reactor under the action of gravity and the upward magnetic field and airflow. In addition to the action of the first fluidization, the high-performance powder metallurgy metal material and the tungsten steel auxiliary agent also continuously collide, rub and shear, thereby achieving further edge grinding, but there is adhesion and agglomeration between particles. The shape improvement effect of the high-performance powder metallurgy metal material obtained by only primary and tertiary fluidization in Comparative Example 3 is not as good as that of Comparative Example 2, but the particles are relatively dispersed and less adhered. This may be because the high-performance powder metallurgy metal material is subjected to the three-stage fluidization on the basis of the primary fluidization, and the adhesion agglomerates of the high-performance powder metallurgy metal material are decomposed by the combined action of gravity, upward airflow, and up and down sound waves, so that the dispersion is better and the fluidization quality is improved. The high-performance powder metallurgy metal material obtained in Example 1 after primary, secondary, and tertiary fluidization has a smooth surface, the highest sphericity, basically no edges and corners, and basically no adhesion between particles.

[0037] The particle size distribution, oxygen content and fluidity of the high performance powder metallurgy metal materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were tested, and the results are shown in Table 1: Table 1. Performance test results of high performance powder metallurgy metal materials As can be seen from Table 1, compared with Comparative Examples 1 to 3, the high-performance powder metallurgy metal materials prepared in Examples 1 to 3 of the present application have moderate particle size distribution, good fluidity, low oxygen content, high tap density, and are suitable for additive manufacturing.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a high-performance powder metallurgy metal material, characterized in that: The following steps are involved: S1, preparation of metallurgical metal powder by water mist method; S2, primary fluidization: adding metallurgical metal powder to a fluidized bed reactor under argon atmosphere at 400-420°C; then adjusting the argon flow rate to fluidize the metallurgical metal powder for 10-12 minutes; S3, secondary fluidization: cool down to 200-250°C, add auxiliary agent, adjust the argon gas flow rate, turn on the magnetic field generator, and fluidize the metallurgical metal powder and auxiliary agent under the action of the magnetic field. Keep for 15-20 minutes, turn off the magnetic field generator, and remove the auxiliary agent; S4, three-stage fluidization: adjust the argon gas flow rate, adjust the temperature to 250-300°C, start the acoustic field generating device, fluidize the metallurgical metal powder under the action of the acoustic field, maintain for 20-30 minutes, and turn off the acoustic field generating device; S5, turn off the heat source, adjust the argon gas flow rate, drop to room temperature, collect the metallurgical metal powder after fluidization, which is the high-performance powder metallurgy metal material.

2. The method for preparing a high-performance powder metallurgy metal material according to claim 1, characterized in that: The metallurgical metal powder is SS-430L ferritic stainless steel powder; the average particle size of the SS-430L ferritic stainless steel powder is 20-24 μm.

3. The method for preparing a high-performance powder metallurgy metal material according to claim 2, characterized in that: The auxiliary agent is spherical tungsten steel, and the particle size of the spherical tungsten steel is 26-28 μm.

4. The method for preparing a high-performance powder metallurgy metal material according to claim 3, characterized in that: The mass ratio of the auxiliary agent to the metallurgical metal powder is (10-20): (80-90).

5. The method for preparing a high-performance powder metallurgy metal material according to claim 4, characterized in that: The magnetic field generating device is composed of a voltage-stabilizing power supply and a Helmholtz coil, and the Helmholtz coil is movably sleeved on the fluidized bed reactor.

6. The method for preparing a high-performance powder metallurgy metal material according to claim 5, characterized in that: The magnetic direction generated by the voltage-stabilized power supply in the magnetic field generating device is downward and parallel to the radial direction of the fluidized bed.

7. The method for preparing a high-performance powder metallurgy metal material according to claim 6, characterized in that: The method for removing the auxiliary agent is: use a magnet ring to be mounted on the outside of the fluidized bed reactor so that the metallurgical metal powder is fixed by the magnet, and then pour the auxiliary agent out of the outlet, then close the outlet, and then remove the magnet ring.

8. The method for preparing a high-performance powder metallurgy metal material according to claim 7, characterized in that: The sound field generating device comprises a digital signal generator, a power amplifier and a loudspeaker, and the loudspeaker is located on the top of the fluidized bed reactor.

9. A high performance powder metallurgy metal material, characterized in that: The high-performance powder metallurgy metal material is prepared by the preparation method of any one of claims 1-8.

10. The use of a high-performance powder metallurgy metal material according to claim 9, characterized in that: For additive manufacturing.

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