CN112024900A - Spherical metal vanadium powder and preparation method and application thereof - Google Patents
Spherical metal vanadium powder and preparation method and application thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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Abstract
The invention provides spherical metal vanadium powder and a preparation method and application thereof. The preparation method can comprise the following steps: placing a metal vanadium raw material rod in a vacuum environment filled with inert gas; rotating the metal vanadium raw material rod; melting the surface of the metal vanadium raw material rod by using an induction coil; atomizing liquid drops or liquid beams after the metal vanadium raw material rod is melted into liquid particles; cooling and solidifying to obtain the spherical metal vanadium powder. The spherical metal vanadium powder can comprise vanadium powder prepared by the preparation method. The application may comprise an application in the field of laser or electron beam additive manufacturing, and/or an application in the field of laser or electron beam cladding. The beneficial effects of the invention can include: the production efficiency is high and the cost is low; the prepared spherical metal vanadium powder has the characteristics of fine powder particle size, narrow particle size distribution interval, high sphericity, good fluidity, high apparent density, high tap density, few impurities and the like, and can meet the technical requirements of additive manufacturing.
Description
Technical Field
The invention relates to the technical field of preparation of spherical metal vanadium powder, in particular to spherical metal vanadium powder and a preparation method and application thereof.
Background
Vanadium metal is internationally recognized as an ideal candidate material for a certain key structural component of a fusion reactor, and the most remarkable advantages are low activation characteristic and excellent high-temperature strength performance under neutron irradiation. In addition, the vanadium metal also has the advantages of good radiation induced expansion and damage resistance, good dimensional stability, good heat conduction performance, lower thermal expansion coefficient and elastic modulus, low biohazard safety and environmental protection characteristics, good creep resistance, good processability, good corrosion resistance to liquid lithium and the like. The vanadium metal is one of the most important candidate structural materials of the fusion reactor, so that the vanadium metal has wide application prospects in structural designs of a first wall, a cladding, a divertor and the like of the fusion reactor, and in the fields of aerospace and high temperature.
In the application of vanadium metal, various structural parts, such as a space curved surface shell and the like, are generally required to be manufactured. V is generated due to metal vanadium at high temperature2O5The material is a highly toxic substance, so that a vacuum sheath forging method is generally adopted in the preparation process of the material, such as ingot cogging, extrusion and the like, and if the method is also adopted in the shell forming process, the risk of releasing toxic substances due to sheath rupture exists because the deformation amount is large, and the problems of complex process, large allowance, high cost and the like are solved.
At present, the main production method of the metal vanadium powder comprises the following steps: reduction method, fused salt electrolysis method, mechanical alloying method, crushing method, inert gas atomization method and the like. CN201811156064.5 discloses a method for preparing metal vanadium powder by metal gas-based reduction, which comprises the following steps: vanadium oxide is used as a raw material, active metal is used as a reducing agent, the active metal contacts the raw material in a gas form to generate a thermal reduction reaction, and a reaction product is subjected to acid washing, filtering and drying to obtain metal vanadium powder. CN201811222443.X discloses a preparation method of vanadium powder, mixing vanadium-containing material with alkali metal or alkaline earth metal chloride salt, mixing with calcium hydride, and performing vacuum thermal reduction to obtain a reduction product; washing with ammonium chloride solution, alkali liquor and acid liquor in sequence, and finally carrying out dehydrogenation treatment to obtain metal vanadium powder; CN201410335895.4 discloses a preparation method of titanium-aluminum-vanadium alloy powder, which comprises the following steps: a. preparing an electrode: evenly mixing TiO2, Al2O3 and V2O5 powder, pressing and molding, and sintering at high temperature to prepare a titanium-aluminum-vanadium electrode; b. molten salt electrolysis reaction: and (3) carrying out molten salt electrolysis reaction by taking the prepared titanium-aluminum-vanadium alloy electrode as a cathode, a graphite rod as an anode and NaCl-CaCl2 as molten salt electrolyte, wherein the powder obtained in the cathode frame is the titanium-aluminum-vanadium alloy powder. CN109628731A discloses a method for preparing vanadium and alloy powder by processing vanadium-containing raw materials in a short process, firstly oxidizing and roasting the vanadium-containing raw materials and alkaline compounds to generate vanadate which is easy to dissolve in water, removing impurities and precipitating vanadium to form an intermediate product CaV2O6 with sphericity, dissolving the intermediate product CaV2O6 and other raw materials in a molten salt medium to form a uniform reaction system, then adding a reducing agent for reduction, and obtaining vanadium or metal vanadium powder with the particle size of 50-800 nm and the purity of more than or equal to 99.0 wt.% after separation, washing and drying. The sphericity and cleanliness of the vanadium metal or high-purity vanadium metal powder prepared by the method are low.
The conventional metal vanadium powder preparation mainly adopts a reduction method and a molten salt electrolysis method. Because the oxygen content of the metal vanadium powder prepared by the reduction method is higher, the use ratio of the metal vanadium powder is in a descending trend. The powder of the molten salt spray electrolysis method is dendritic, and the pressure of the post-treatment environment is high. The gas atomization method using a crucible is a method in which a high-speed rotating gas is blown into a crucible to prepare a powder when a molten metal is melted in the crucible and then dropped through a fine nozzle. Vanadium metal is a high-melting-point metal, is very sensitive to structure, has high smelting difficulty when being melted in a crucible, is easily polluted by refractory materials, and cannot ensure the purity of the vanadium metal.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, an object of the present invention is to provide a spherical vanadium metal powder, a method for preparing the same, and applications thereof, so as to meet the requirements of additive manufacturing technology and laser cladding.
In order to achieve the above objects, one aspect of the present invention provides a method for preparing spherical vanadium metal powder.
The preparation method can comprise the following steps: placing a metal vanadium raw material rod in a vacuum environment filled with inert gas; rotating the metal vanadium raw material rod; melting the surface of the metal vanadium raw material rod by using an induction coil; atomizing liquid drops or liquid beams after the metal vanadium raw material rod is melted into liquid particles; cooling and solidifying to obtain the spherical metal vanadium powder.
Further, the mass fraction of vanadium in the metal vanadium raw material rod may be 99.5% or more, for example, 99.6%, 99.7%, or the like.
Further, the metal vanadium raw material rod can be processed by a vanadium cast ingot or a rod.
Furthermore, the rotating speed of the metal vanadium raw material rod can be 4-10 r/min, such as 6, 7, 9r/min and the like.
Furthermore, the output power of the induction coil is 80-120 kW, such as 90, 100, 110 kW.
Further, the step of atomizing the molten liquid drops or liquid beams of the metal vanadium raw material rod into liquid particles under high-pressure gas flow comprises the following steps: making the molten liquid drops or liquid beams of the metal vanadium raw material rod enter an atomizing nozzle; atomizing the liquid drops or the liquid beams into liquid particles in an atomizing tower by using an atomizing nozzle, wherein the pressure of atomizing gas used by the atomizing nozzle is 5.0-7.5 MPa, and the gas flow is 300-700L/S-1. For example, the pressure of the atomizing gas may be 5.5, 6, 7MPa, etc., and the gas flow rate may be 350, 450, 55, 650L/S-1And the like.
Furthermore, the upper part of the atomizing tower is provided with an auxiliary air inlet, and air is introduced into the atomizing tower through the auxiliary air inlet during atomization so as to eliminate vortex generated by the atomizing air in the atomizing tower. Furthermore, the pressure of the gas introduced through the auxiliary gas inlet can be 0.1-1.5 MPa, and the flow rate of the gas can be 10-100L/S-1E.g., 0.2, 0.5, 0.8, 1.3MPa, etc., 15, 30, 70, 90L/S-1And the like.
Further, the step of placing the metal vanadium raw material rod in a vacuum environment filled with inert gas may include: placing the metal vanadium raw material rod at a pressure of 9 x 10-3In a vacuum atmosphere of less than PaThen inert gas is introduced to replace the air.
In another aspect, the invention provides spherical metal vanadium powder. The spherical metal vanadium powder can comprise the spherical metal vanadium powder prepared by the preparation method of the spherical metal vanadium powder.
In a further aspect, the invention provides an application of the spherical metal vanadium powder, wherein the application can include an application in the field of laser or electron beam additive manufacturing, and/or an application in the field of laser or electron beam cladding, such as an application in electron beam 3D printing.
Compared with the prior art, the beneficial effects of the invention can include: the production efficiency is high and the cost is low; the prepared spherical metal vanadium powder has the characteristics of fine powder particle size, narrow particle size distribution interval, high sphericity, good fluidity, high apparent density, high tap density, few impurities and the like, and can meet the technical requirements of additive manufacturing.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a schematic view of the generation and removal of gas vortices within an atomizing tower;
FIG. 2 shows a morphology of spherical vanadium metal powder prepared in example 1;
fig. 3 shows a schematic diagram of a particle size distribution of spherical vanadium metal powder prepared in example 1.
Detailed Description
Hereinafter, the spherical metal vanadium powder of the present invention, the preparation method thereof, and the use thereof will be described in detail with reference to the accompanying drawings and exemplary embodiments.
Because the metal vanadium belongs to refractory metal, the difference between each process parameter of the gas atomization powder preparation process and the gas atomization process of common metal is larger, and the gas atomization similar process of the common metal is difficult to prepare qualified spherical vanadium powder.
Therefore, the invention provides spherical metal vanadium powder and a preparation method thereof.
In an exemplary embodiment of the present invention, the method for preparing the spherical metal vanadium powder may include: metal vanadium ingot or bar → machining to raw material bar → induction heating → high pressure inert gas atomization powder manufacturing → cooling → sieving and packaging.
Specifically, the preparation method may comprise the steps of:
A. processing a vanadium ingot or bar into a raw material rod with the diameter of phi 30-70 mm and the length of 300-1000 mm, namely a metal vanadium raw material rod, according to the required size of atomizing equipment by adopting a machining method; wherein, the diameter of the raw material rod is too small, the production efficiency is not high, and the power of the equipment is too large to meet the requirement; the long raw material rod increases the height of the vacuum chamber of the equipment and the height of a factory building, and the short raw material rod is inefficient. Wherein the bar material may comprise forged and rolled bar material.
B. The melting chamber and the atomizing chamber of the atomizing equipment are vacuumized, and the vacuum degree is higher than 9 multiplied by 10-3Pa (i.e. pressure at 9X 10)- 3Below Pa) is filled with other inert gases such as argon or helium, the raw material rod is sent into the melting cavity, and the feeding rotating speed of the raw material rod is controlled to be 4-10 r/min. Wherein, too high vacuum in the equipment of extraction will prolong equipment production preparation time and improve and equip the level, reduces work efficiency, and the equipment of extraction is interior vacuum is low excessively, and the oxygen content is higher in the atomizer chamber, need to rush into more inert gas in order to replace and get rid of oxygen and the time spent is longer, uneconomic.
C. The method comprises the steps of feeding a raw material rod into an induction coil at a constant speed, controlling the output power of the induction coil to be 80-120 kW, melting metal on the surface of the raw material rod, forming liquid drops at the tip end of the raw material rod, and dropping the liquid drops into an atomizing nozzle. Wherein the induction coil may comprise a high frequency induction coil.
D. Metal liquid drops or liquid beams are atomized into powder particles through a tightly coupled gas atomization nozzle, the pressure of atomization gas can be controlled to be 5-7.5 MPa, and the flow rate of the gas can be controlled to be 400-700L/S-1. The gas may include inert gases such as argon, helium, and other inert gases (except nitrogen).
The important disadvantage of the gas atomization process is that the powder product is prone to satellite powder, so that the flowability of the powder is reduced. FIG. 1 (a) is a diagram showing the production of high-pressure gas atomization in an atomization towerThe schematic diagram of the vortex is generated, and the main factor of the satellite powder generation is that the atomizing airflow generates airflow vortex above the atomizing tower, so that part of atomized powder collides and adheres with the powder which is just atomized to form the satellite powder. For this purpose, the invention adds an auxiliary air inlet on the upper part of the atomizing tower to eliminate the eddy of the air flow while atomizing, and the schematic diagram of the secondary auxiliary air inlet in the eliminating tower shown in (b) of fig. 1 shows. The pressure of the gas in the auxiliary gas inlet can be controlled to be 0.1-1.5 MPa, and the flow can be controlled to be 10-100L/S-1. The included angle between the air inlet direction of the auxiliary air inlets and the vertical direction can be 0-30 degrees, the number of the auxiliary air inlets can be multiple, the multiple auxiliary air inlets can be uniformly arranged on the upper portion of the atomizing tower, and the gas introduced into the auxiliary air inlets can be inert gas, such as argon, helium and other inert gases (except nitrogen).
E. And carrying out cyclone classification or ultrasonic screening on the atomized and solidified powder particles to obtain spherical metal vanadium powder. The powder can be used for laser cladding or additive manufacturing.
In this embodiment, the close-coupled gas atomizing nozzle may comprise a double-sided symmetrical tangential air inlet laval-style ring seam close-coupled nozzle.
In this embodiment, the cyclone classification or ultrasonic screening may classify the atomized vanadium metal powder according to different particle size grades, and further, the screening may be followed by vacuum or inert gas encapsulation.
In the embodiment, further, the vacuum degree of the melting cavity and the atomizing chamber can be controlled to be 7.6 x 10-3Pa or less, e.g. 7.5. + -. 0.1X 10-3Pa，5×10-3Pa, and the like.
In summary, the invention makes a metal vanadium raw material rod slowly descend through an induction coil, melts the metal on the front end surface of the vanadium raw material rod into liquid under the high-frequency induction heating condition, drops the liquid to a nozzle, is crushed and atomized into fine liquid vanadium particles by high-pressure argon or helium, and is cooled and solidified into powder under the action of surface tension.
The invention can adjust and control the granularity and the appearance of the powder by changing the feeding rotating speed of the metal vanadium raw material rod, the output power of the induction coil, the pressure and the flow of the atomizing gas, increasing the shapes of the auxiliary air inlet and the nozzle and other parameters. Because the molten metal does not contact with crucible and other utensils, the powder is not polluted, so that it can prepare the metal vanadium powder with high cleanliness, low oxygen content and good sphericity.
The chemical components and the powder physical properties of the spherical metal vanadium powder prepared by the method meet the technical requirements of additive manufacturing. The invention has the advantages that the prepared powder has good sphericity, high purity, less satellite powder, good fluidity and high powder yield. The sphericity of the prepared powder reaches 81-89%, and the yield of the powder is 75-90%. Wherein the oxygen content in the metal vanadium powder is 500-1050 ppm when the particle size is less than 53 μm.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
Example 1
A metal vanadium ingot casting rod with the vanadium content of 99.5 percent (mass fraction) is processed into a raw material rod meeting the required size of atomizing equipment by a machining method, wherein the diameter of the raw material rod is phi 30 +/-1 mm, and the length of the raw material rod is 500 +/-5 mm. And after cleaning impurities on the surface of the bar stock, putting the electrode bar into atomization equipment.
The melting cavity and the atomizing chamber are vacuumized, and the vacuum degree is 7.5 +/-0.1 multiplied by 10-3And introducing argon gas when the pressure is Pa, controlling the feeding rotation speed of the bar stock to be 7 +/-1 r/min, and conveying the bar stock into a melting cavity. And feeding the electrode rod into the induction coil at a constant speed, controlling the output power of the high-frequency induction coil to be 85 +/-1 kW, melting metal on the surface of the electrode rod, forming liquid drops at the tip of the raw material rod, and dropping the liquid drops into the atomizing nozzle. Atomizing molten metal droplets into fine liquid particles by a tightly coupled gas atomizing nozzle, cooling and solidifying the liquid particles into powder particles under the action of surface tension, and controlling the pressure of atomizing gas to be 6.0 +/-0.1 MPa and the flow of argon gas to be 500 +/-10L/S-1. The pressure of the gas in the auxiliary gas inlet can be controlled to be 0.5MPa, and the flow rate of the gas can be controlled to be 50L/S-1。
And (3) carrying out ultrasonic screening on the powder obtained by atomization through 100 meshes, 325 meshes and 900 meshes to obtain spherical metal vanadium powder with the granularity of 45-15 mu m and 150-45 mu m and meeting the requirements of laser cladding or additive manufacturing.
The granularity of the prepared spherical vanadium powder is between 150 and 45 mu m, the sphericity reaches 88 percent, and the powder fluidity is 23s/50g-1The morphology of the powder particles is schematically shown in FIG. 2. When the powder granularity is below 150 mu m, the oxygen content in the metal vanadium powder is 850ppm, the yield of the metal vanadium powder is more than 93 percent from the bar stock to the prepared spherical metal vanadium powder with the granularity below 150 mu m, and the powder granularity distribution is shown in figure 3.
Example 2
A metal vanadium rolling bar with the vanadium content of 99.9 percent (mass fraction) is processed into a raw material bar which meets the required size of atomizing equipment by a machining method, the diameter of the raw material bar is phi 45 +/-1 mm, and the length of the raw material bar is 600 +/-10 mm. And after cleaning impurities on the surface of the bar stock, putting the electrode bar into atomization equipment.
The melting cavity and the atomizing chamber are vacuumized, and the vacuum degree is 8 plus or minus 0.1 multiplied by 10-3And introducing argon gas when the pressure is Pa, and conveying the bar stock with the feeding rotating speed of 9 +/-1 r/min into the melting cavity. And feeding the electrode rod into the induction coil at a constant speed, controlling the output power of the high-frequency induction coil to be 110 +/-1 kW, melting metal on the surface of the electrode rod, forming liquid drops at the tip of the raw material rod, and dropping the liquid drops into the atomizing nozzle. Atomizing molten metal droplets into fine liquid particles by a tightly coupled gas atomizing nozzle, cooling and solidifying the liquid particles into powder particles under the action of surface tension, controlling the pressure of atomizing gas to be 7.0 +/-0.1 MPa and the flow of argon gas to be 600 +/-10L/S-1. The pressure of the gas in the auxiliary gas inlet can be controlled to be 0.6MPa, and the flow rate of the gas can be controlled to be 80L/S-1。
And (3) carrying out ultrasonic screening on the powder obtained by atomization through 100 meshes, 325 meshes and 900 meshes to obtain spherical metal vanadium powder with the granularity of 45-15 mu m and 150-45 mu m and meeting the requirements of laser cladding or additive manufacturing.
The prepared powder with the granularity of 150-45 mu m has the sphericity of 90 percent and the powder fluidity of 21s/50g-1The oxygen content in the metal vanadium powder was 810 ppm. From a bar stock to powder with the particle size of the metal vanadium powder below 150 mu mThe yield is more than 96 percent.
The invention also provides spherical metal vanadium powder and application thereof. The spherical metal vanadium powder can comprise the spherical metal vanadium powder prepared by the preparation method. The application can include the application of the spherical metal vanadium powder in the laser cladding or additive manufacturing field, such as the high-speed laser cladding deposition field, the electron beam selective melting field and the like.
In summary, the advantages of the spherical vanadium metal powder, the preparation method and the application thereof of the present invention can include:
(1) the preparation method has high production efficiency and low cost.
(2) The invention adopts a crucible-free gas atomization method to prepare spherical metal vanadium powder, and the produced spherical metal vanadium powder has the following characteristics: fine powder grain diameter, narrow grain diameter distribution interval, high powder grain sphericity, good fluidity, large apparent density, high tap density and less impurities.
(3) The atomization device is good in sealing effect, and the mode of vacuum and inert gas protection is adopted in the atomization cavity, so that the risk of leakage of fine powder is reduced.
(4) The prepared spherical metal vanadium powder can be used for developing important parts required by a nuclear reactor through an additive manufacturing technology.
Although the present invention has been described above by reference to the accompanying drawings and exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.
Claims (10)
1. The preparation method of the spherical metal vanadium powder is characterized by comprising the following steps:
placing a metal vanadium raw material rod in a vacuum environment filled with inert gas;
rotating the metal vanadium raw material rod;
melting the surface of the metal vanadium raw material rod by using an induction coil;
atomizing liquid drops or liquid beams melted by the metal vanadium raw material rod into liquid particles under high-pressure airflow; cooling and solidifying to obtain the spherical metal vanadium powder.
2. The method for preparing spherical metal vanadium powder according to claim 1, wherein the mass fraction of vanadium in the metal vanadium raw material rod is 99.5% or more.
3. The method for preparing spherical metal vanadium powder according to claim 1, wherein the metal vanadium raw material rod is processed by a vanadium ingot or bar.
4. The method for preparing the spherical metal vanadium powder according to claim 1, wherein the rotation speed of the metal vanadium raw material rod is 4-10 r/min.
5. The method for preparing spherical metal vanadium powder according to claim 1, wherein the output power of the induction coil is 80 to 120 kW.
6. The method for preparing spherical vanadium metal powder according to claim 1, wherein the step of atomizing the molten liquid drops or liquid beams of the vanadium metal raw material rods into liquid particles under a high-pressure gas flow comprises:
making the molten liquid drops or liquid beams of the metal vanadium raw material rod enter an atomizing nozzle;
atomizing the liquid drops or the liquid beams into liquid particles in an atomizing tower by using an atomizing nozzle, wherein the pressure of atomizing gas used by the atomizing nozzle is 5.0-7.5 MPa, and the gas flow is 300-700L/S-1。
7. The method for preparing spherical metal vanadium powder according to claim 6, wherein an auxiliary gas inlet is arranged at the upper part of the atomizing tower, and gas is introduced into the atomizing tower through the auxiliary gas inlet while atomizing, so as to eliminate vortex generated by the atomizing gas in the atomizing tower.
8. According to claim 7The preparation method of the spherical metal vanadium powder is characterized in that the pressure of gas introduced through the auxiliary gas inlet is 0.1-1.5 MPa, and the flow rate of the gas is 10-100L/S-1。
9. A spherical metal vanadium powder, characterized in that the spherical metal vanadium powder comprises a spherical metal vanadium powder prepared by the method for preparing a spherical metal vanadium powder according to any one of claims 1 to 8.
10. The spherical metal vanadium powder of claim 9, which is applied to the field of laser or electron beam additive manufacturing and laser or electron beam cladding.
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| CN113770349A (en) * | 2021-09-14 | 2021-12-10 | 有研工程技术研究院有限公司 | High-purity spherical metal vanadium powder and preparation method and application thereof |
| CN116984618A (en) * | 2023-09-28 | 2023-11-03 | 季华实验室 | Air atomizing equipment |
| CN117259770A (en) * | 2023-11-21 | 2023-12-22 | 西安赛隆增材技术股份有限公司 | Gas control system for preparing powder based on PREP and application method thereof |
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| CN113770349A (en) * | 2021-09-14 | 2021-12-10 | 有研工程技术研究院有限公司 | High-purity spherical metal vanadium powder and preparation method and application thereof |
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| CN117259770A (en) * | 2023-11-21 | 2023-12-22 | 西安赛隆增材技术股份有限公司 | Gas control system for preparing powder based on PREP and application method thereof |
| CN117259770B (en) * | 2023-11-21 | 2024-02-13 | 西安赛隆增材技术股份有限公司 | Gas control system for preparing powder based on PREP and application method thereof |
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