CN114951667A - Method for preventing nozzle from being blocked in preparation of metal powder through gas atomization - Google Patents
Method for preventing nozzle from being blocked in preparation of metal powder through gas atomization Download PDFInfo
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- CN114951667A CN114951667A CN202210584490.9A CN202210584490A CN114951667A CN 114951667 A CN114951667 A CN 114951667A CN 202210584490 A CN202210584490 A CN 202210584490A CN 114951667 A CN114951667 A CN 114951667A
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- 239000002184 metal Substances 0.000 title claims abstract description 79
- 239000000843 powder Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000009689 gas atomisation Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title description 4
- 230000006698 induction Effects 0.000 claims abstract description 47
- 238000000889 atomisation Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000007769 metal material Substances 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 114
- 229910052786 argon Inorganic materials 0.000 claims description 57
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 3
- 238000004886 process control Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000010146 3D printing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- B22F9/082—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 atomising using a fluid
-
- 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
- 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
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
-
- 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
- B22F9/082—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 atomising using a fluid
- B22F2009/0824—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 atomising using a fluid with a specific atomising fluid
-
- 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
- B22F9/082—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 atomising using a fluid
- B22F2009/0848—Melting process before atomisation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention relates to a method for preparing metal powder anti-spray nozzle blockage by gas atomization, which atomizes metal materials in a pressurizing mode in an induction furnace body, increases the power of metal liquid flowing through a spray nozzle by utilizing the pressure difference between the induction furnace body and an atomizing chamber, and simultaneously avoids the spray nozzle blockage by matching with other process controls. The method of the invention utilizes the original atomizing furnace without modifying the equipment. Compared with the prior art, the invention provides the pressurized atomization in the induction furnace body aiming at the problems of the existing method, the power of the metal liquid flowing through the nozzle is increased by utilizing the pressure difference between the induction furnace body and the atomization chamber, and the nozzle blockage is avoided by matching with other process controls such as tundish temperature, metal liquid superheat degree and the like. The method of the invention utilizes the original atomization furnace, does not need to transform equipment, has obvious application effect and can effectively avoid nozzle blockage in the atomization powder making process.
Description
Technical Field
The invention relates to the field of metal powder material preparation, in particular to a method for preventing a nozzle from being blocked by preparing metal powder through gas atomization.
Background
With the development of metal 3D printing technology, the quality of metal powder plays a crucial role in the development of the whole system. The gas atomization method is one of the main methods for preparing high-performance metal powder, and is characterized in that a metal melt is crushed into fine liquid drops through high-speed and high-pressure airflow generated by atomization equipment, and then the fine liquid drops are spheroidized, cooled and solidified to form metal powder. The powder prepared by the method has the structural characteristics of rapid solidification, such as fine crystal grains, little or no segregation, high solid solubility and the like. The shape of the atomized powder particles is mainly spherical and nearly spherical, the particle size is controllable, and the method is one of the ideal methods for preparing the metal powder for 3D printing. However, in the process of preparing the powder by adopting the method, the temperature of the metal liquid at the nozzle is reduced, the viscosity is increased, so that the metal liquid flows slowly, the problem of nozzle blockage is finally generated, the production is finally interrupted, and unnecessary loss is caused.
To overcome the above disadvantages, metallurgists employ techniques to minimize the problem of nozzle clogging. Patent document "anti-blocking structure of 3D printing metal powder apparatus for producing" (application number: 201821343183.7, publication number: CN 208853715U). Discloses a 3D prints stifled structure of preventing of metal powder apparatus for producing. The device comprises a metal melting device, a molten metal heat preservation device, a flow guide pipe and an air inlet device, wherein the flow guide pipe and the air inlet device are positioned at the bottom end of the heat preservation device; the air inlet device comprises an air inlet pipe and an air injection ring, the air inlet pipe is communicated with the air injection ring, the air injection ring is a plurality of air outlet holes in a circle or is an annular air outlet, and air flow is sprayed out through the air injection ring and contacts with molten metal flowing out of the flow guide pipe. The structure can reduce the problem that metal particles fall into the diversion pipe opening simultaneously to block the diversion pipe through the asymmetric structure, and the probability that the diversion pipe is blocked is reduced. However, the method needs to modify the original atomization equipment, and has high application difficulty, so that the method is not used in large quantities in industrial production.
Patent document "anti-clogging nozzle device for producing metal powder by gas atomization" (application No. 201520391626.X, publication No. CN 204747508U). Discloses an anti-clogging nozzle device for preparing metal powder by a gas atomization method. The device comprises a flow guide pipe and an air cavity positioned around the flow guide pipe, wherein the air cavity is connected with an air inlet pipe, and a nozzle circular seam communicated with the air cavity is arranged around the lower end of the flow guide pipe; an air guide seam surrounding the flow guide pipe is arranged between the air cavity and the flow guide pipe, and an opening of the air guide seam is positioned between the flow guide pipe and the nozzle annular seam; and the cavity wall of the air cavity is provided with an air guide hole communicated with the air guide seam. The nozzle device can reduce the nodulation of molten metal at the nozzle and prevent the guide pipe from being blocked. The method also needs to modify the original atomization equipment, and has high application difficulty, so that the method is not used in large quantities in industrial production.
Based on the current situation of atomization powder preparation, a convenient and practical gas atomization method is urgently needed to avoid nozzle blockage, so that the production is smooth and the production requirement is met.
Disclosure of Invention
The invention aims to provide a method for preparing metal powder blowout prevention nozzle blockage through gas atomization, which provides atomization in a pressurization mode in an induction furnace body, increases the power of metal liquid flowing through a nozzle by utilizing the pressure difference between the induction furnace body and an atomization chamber, and avoids the nozzle blockage by matching with other process control. The method can utilize the original atomizing furnace, does not need to transform equipment, and has practicability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preventing the nozzle from being blocked by preparing metal powder by gas atomization is characterized in that a metal material is atomized by pressurizing in an induction furnace body, the power of the metal liquid flowing through the nozzle is increased by utilizing the pressure difference between the induction furnace body and an atomization chamber, and the nozzle is prevented from being blocked by matching with other process controls. The method of the invention utilizes the original atomization furnace without modifying the equipment.
The specific method comprises the following steps:
1) and putting the metal material to be melted into an induction furnace, vacuumizing, and then electrifying and heating until the metal material is completely melted.
2) And (3) closing the vacuum system, filling argon or other inert gases into the induction furnace body, wherein the pressure is 1.0-2.0MPa, adding other alloys to obtain molten metal with required components, and controlling the superheat degree of the molten metal to be 250-350 ℃.
The pressure of argon gas filled into the induction furnace body is 1.0-2.0MPa, so that sufficient pressure difference exists between the induction furnace body and the atomizing chamber during atomization to increase the power of metal liquid flowing through the nozzle. The superheat degree of the metal liquid is controlled at 250-350 ℃ to avoid the problem that the viscosity of the metal liquid is increased to block a nozzle due to low temperature of the metal liquid in the atomization process, but the superheat degree cannot be larger than 350 ℃, otherwise, the problem that the sphericity of the powder is reduced or the powder particles are sintered is easily caused.
3) Opening a blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely; the blow-off valve of the tank body of the atomizing chamber is opened, so that the gas pressure in the atomizing chamber is reduced, and a larger pressure difference is formed between the gas pressure and the inside of the induction furnace body.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is 20-30 ℃ higher than the melting point of the alloy.
The temperature of the tundish is 20-30 ℃ higher than the melting point of the alloy, so that the problem of nozzle blockage caused by the increase of the viscosity of the molten metal due to the reduction of the temperature of the molten metal in the atomization process is avoided.
5) After the atomization of the metal liquid is finished, continuously blowing high-pressure atomized argon, reducing the pressure of the argon to 0.5-1MPa, and controlling the blowing time to be 30-60 seconds; and simultaneously, closing an inflation valve in the induction furnace body and stopping filling argon or other inert gases. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
After complete atomization is finished, high-pressure atomized argon is continuously blown, the pressure of the argon is reduced to 0.5-1MPa, and the blowing time is 30-60 seconds, so that the problem that a small amount of residual metal liquid enters the gas nozzle after atomization is finished to cause the blockage of the gas nozzle is avoided.
And starting to electrify and heat after the vacuum degree in the induction furnace in the step 1) is less than 2 Pa. The vacuum degree in the induction furnace is less than 2Pa so as to prevent the metal material from being oxidized when being melted.
And 4) pouring the molten metal in the crucible of the induction furnace into a tundish, wherein the molten metal flows through a high-pressure low-temperature argon spraying area through a guide pipe, and the pressure of atomized argon is 4-8 MPa.
The powder was collected when the powder temperature was below 50 ℃. The powder is collected at a temperature below 50 ℃ to prevent high-temperature oxidation of the powder.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for preventing a nozzle from being blocked in a process of preparing metal powder by gas atomization. Aiming at the problems of the existing method, the atomization is carried out in a pressurization mode in the induction furnace body, the power of the metal liquid flowing through the nozzle is increased by utilizing the pressure difference between the induction furnace body and the atomization chamber, and the nozzle is prevented from being blocked by matching with other process controls such as tundish temperature, metal liquid superheat degree and the like. The method of the invention utilizes the original atomization furnace, does not need to transform equipment, has obvious application effect and can effectively avoid nozzle blockage in the atomization powder making process.
Detailed Description
The present invention is described in more detail by way of examples, which are merely illustrative of the best mode of carrying out the invention and are not intended to limit the scope of the invention in any way.
Several embodiments of the invention are described below:
example 1:
name of powder product: 316
1) And putting the metal material to be melted into an induction melting furnace, vacuumizing, electrifying and heating until the metal material is completely melted after the vacuum degree is less than 2 Pa.
2) And (3) closing the vacuum system, filling argon into the induction furnace body, wherein the pressure is 1.2MPa, and adding other alloys to obtain molten metal with the required components of 316. The superheat degree of the molten metal is controlled at 260 ℃.
3) And opening the blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is higher than the melting point of the alloy by 22 ℃. And pouring the molten metal in the crucible of the induction furnace into a tundish, wherein the molten metal flows through a high-pressure low-temperature argon spraying area through a guide pipe, and the pressure of the high-pressure atomization argon is 4.5 MPa.
5) After the metal liquid is completely atomized, continuously blowing high-pressure atomized argon, reducing the argon pressure to 0.9MPa, and controlling the blowing time to 35 seconds. And simultaneously closing an argon filling valve in the induction furnace body and stopping argon filling. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
6) Collecting powder when the temperature of the powder is lower than 45 ℃.
Example 2:
name of powder product: 316
1) And putting the metal material to be melted into an induction melting furnace, vacuumizing, and electrifying and heating until the metal material is completely melted after the vacuum degree is less than 2 Pa.
2) And (3) closing the vacuum system, filling argon into the induction furnace body, wherein the pressure is 1.5MPa, and adding other alloys to obtain molten metal with the required components of 316. The superheat degree of the molten metal is controlled at 300 ℃.
3) And opening the blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is higher than the melting point of the alloy by 28 ℃. And pouring the molten metal in the crucible of the induction furnace into a tundish, wherein the molten metal flows through a high-pressure low-temperature argon spraying area through a guide pipe, and the pressure of the high-pressure atomization argon is 5 MPa.
5) After the metal liquid is completely atomized, continuously blowing high-pressure atomized argon, reducing the argon pressure to 0.8MPa, and controlling the blowing time to be 40 seconds. And simultaneously closing an argon filling valve in the induction furnace body and stopping argon filling. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
6) Collecting powder when the temperature of the powder is lower than 40 ℃.
Example 3:
name of powder product: t91
1) And putting the metal material to be melted into an induction melting furnace, vacuumizing, electrifying and heating until the metal material is completely melted after the vacuum degree is less than 2 Pa.
2) And (3) closing the vacuum system, filling nitrogen into the induction furnace body, wherein the pressure is 1.8MPa, and adding other alloys to obtain molten metal with components required by T91. The superheat degree of the molten metal is controlled at 320 ℃.
3) And opening the blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is higher than the melting point of the alloy by 25 ℃. And pouring the molten metal in the crucible of the induction furnace into a tundish, wherein the molten metal flows through a high-pressure low-temperature argon spraying area through a guide pipe, and the pressure of the high-pressure atomization argon is 6 MPa.
5) After the metal liquid is completely atomized, continuously blowing high-pressure atomized argon, reducing the argon pressure to 0.6MPa, and blowing for 50 seconds. And simultaneously closing a nitrogen charging valve in the induction furnace body and stopping charging nitrogen. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
6) Collecting powder when the temperature of the powder is lower than 35 ℃.
Example 4:
name of powder product: 430
1) And putting the metal material to be melted into an induction melting furnace, vacuumizing, electrifying and heating until the metal material is completely melted after the vacuum degree is less than 2 Pa.
2) And (3) closing the vacuum system, filling argon into the induction furnace body, wherein the pressure is 1.9MPa, and adding other alloys to obtain the molten metal with the required components of 430. The superheat degree of the molten metal is controlled at 330 ℃.
3) And opening the blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is higher than the melting point of the alloy by 22 ℃. And pouring the molten metal in the crucible of the induction furnace into a tundish, and enabling the molten metal to flow through a high-pressure low-temperature argon spraying area through a guide pipe, wherein the pressure of the high-pressure atomization argon is 4.8 MPa.
5) After the metal liquid is completely atomized, continuously blowing high-pressure atomized argon, reducing the argon pressure to 0.7MPa, and controlling the blowing time to be 55 seconds. And simultaneously closing an argon filling valve in the induction furnace body and stopping argon filling. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
6) Collecting powder when the temperature of the powder is lower than 25 ℃.
Example 5:
name of powder product: h13
1) And putting the metal material to be melted into an induction melting furnace, vacuumizing, electrifying and heating until the metal material is completely melted after the vacuum degree is less than 2 Pa.
2) And (3) closing the vacuum system, filling nitrogen into the induction furnace body, wherein the pressure is 1.2MPa, and adding other alloys to obtain molten metal with the components required by H13. The superheat degree of the molten metal is controlled at 340 ℃.
3) And opening the blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be discharged freely.
4) And detecting the temperature of the tundish, and starting high-pressure argon in the atomization system to atomize when the temperature of the tundish is higher than the melting point of the alloy by 23 ℃. And pouring the molten metal in the crucible of the induction furnace into a tundish, wherein the molten metal flows through a high-pressure low-temperature argon spraying area through a guide pipe, and the pressure of the high-pressure atomization argon is 6.2 MPa.
5) After the metal liquid is completely atomized, continuously blowing high-pressure atomized argon, reducing the argon pressure to 0.9MPa, and controlling the blowing time to 35 seconds. And simultaneously closing a nitrogen charging valve in the induction furnace body and stopping charging nitrogen. And closing the diffusing valve of the tank body of the atomizing chamber after the high-pressure atomized argon is blown.
6) Collecting powder when the temperature of the powder is lower than 45 ℃.
In the process of preparing the powder, the molten metal is completely atomized, and the problem of nozzle blockage does not occur in the process.
Claims (5)
1. A method for preparing metal powder blowout prevention nozzle blockage through gas atomization is characterized in that metal materials are atomized in a pressurizing mode in an induction furnace body, and the power of metal liquid flowing through a nozzle is increased by utilizing the pressure difference between the induction furnace body and an atomization chamber, so that the nozzle blockage is avoided.
2. The method for preparing the blockage of the metal powder blowout prevention nozzle through gas atomization according to claim 1, wherein the specific method comprises the following steps:
1) putting a metal material to be melted into an induction furnace, vacuumizing, and then electrifying and heating until the metal material is completely melted;
2) closing a vacuum system, filling argon or other inert gases into the induction furnace body, wherein the pressure is 1.0-2.0MPa, adding other alloys to obtain molten metal with required components, and controlling the superheat degree of the molten metal to be 250-350 ℃;
3) opening a blow-off valve of the tank body of the atomizing chamber to enable gas in the atomizing chamber to be freely discharged;
4) detecting the temperature of the tundish, and starting high-pressure argon in an atomization system to atomize when the temperature of the tundish is 20-30 ℃ higher than the melting point of the alloy;
5) after the atomization of the metal liquid is finished, continuously blowing high-pressure atomized argon, reducing the pressure of the argon to 0.5-1MPa, and controlling the blowing time to be 30-60 seconds; and simultaneously, closing an inflation valve in the induction furnace body and stopping filling argon or other inert gases.
3. The method for preparing the metal powder anti-spray nozzle blockage through the gas atomization according to claim 2, wherein the induction furnace starts to be electrified and heated after the vacuum degree in the induction furnace in the step 1) is less than 2 Pa.
4. The method for preparing the metal powder nozzle plug through gas atomization according to claim 2, wherein the step 4) is to pour the metal melt in the crucible of the induction furnace into the tundish, and the metal liquid flows through the argon gas injection area through the flow guide pipe, and the pressure of the atomized argon gas is 4-8 MPa.
5. The method of claim 2, wherein the powder is collected when the powder temperature is below 50 ℃.
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| CN110640156A (en) * | 2019-10-25 | 2020-01-03 | 西安交通大学 | Gas atomization preparation process of iron powder for additive manufacturing and repairing |
| CN111992728A (en) * | 2020-08-23 | 2020-11-27 | 苏州超弦新材料有限公司 | Preparation method of spherical metal powder for additive manufacturing |
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