CN113145853B - Gas atomization preparation device and method for spherical metal powder - Google Patents
Gas atomization preparation device and method for spherical metal powder Download PDFInfo
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- CN113145853B CN113145853B CN202110434166.4A CN202110434166A CN113145853B CN 113145853 B CN113145853 B CN 113145853B CN 202110434166 A CN202110434166 A CN 202110434166A CN 113145853 B CN113145853 B CN 113145853B
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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
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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
- 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
- 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
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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
- B22F2009/0832—Handling of atomising fluid, e.g. heating, cooling, cleaning, recirculating
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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
- B22F2009/0888—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 casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
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- 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
Abstract
The invention relates to a spherical metal powder gas atomization preparation device and a method, wherein the device comprises a gas atomization nozzle, a vacuum chamber, a metal powder collector and a high-temperature high-pressure gas pipeline; the gas atomization nozzle consists of a shell, a heating device and a molten metal pouring gate; the shell is internally provided with an annular gas flow passage, the annular gas flow passage is internally provided with a heating device, the outer side of the shell is provided with a preheated high-pressure inert gas inlet, and a high-temperature high-pressure gas pipeline is communicated with the annular gas flow passage through the preheated high-pressure inert gas inlet; a molten metal pouring gate is arranged in the middle of the shell, a high-pressure inert gas nozzle is arranged at the bottom of the shell at a position corresponding to a molten metal outlet, the inlet end of the high-pressure inert gas nozzle is communicated with the gas flow channel, and the outlet end of the high-pressure inert gas nozzle faces to the lower part of the molten metal outlet; the bottom of the vacuum chamber is provided with a metal powder collector. The spherical metal powder can be prepared by the method, and the device structure and the preparation process are relatively simple, easy to operate and low in preparation cost.
Description
Technical Field
The invention relates to the technical field of metal powder preparation, in particular to a device and a method for preparing spherical metal powder through gas atomization.
Background
The application range of the metal powder such as iron powder, alloy steel powder and the like comprises 3D printing, isostatic pressing and the like. The fluidity of the metal powder has a great influence on the forming precision and the like, and the most important factor influencing the fluidity of the metal powder is the appearance of the metal powder, and the fluidity of the metal powder is seriously reduced when the metal powder has edges and corners or is in a shape of a flat strip, a strip and the like. Whereas the spherical metal powder has relatively good fluidity. Therefore, how to obtain spherical metal powder is an important problem to be solved for improving the quality of the metal powder.
The Chinese patent with the publication number of CN110640156B discloses a gas atomization preparation process of iron powder for additive manufacturing and repair, wherein a nickel-boron alloy, a ferrovanadium alloy, iron, nickel, graphite carbon particles and chromium are prepared into a master alloy electrode rod; transferring a mother alloy electrode bar into an induction heating chamber, cutting a magnetic induction line in an induction coil by the mother alloy electrode to generate heat, melting the mother alloy electrode bar into molten metal, flowing molten metal flow into an atomizing chamber from the induction heating chamber, introducing argon through a high-pressure argon nozzle to carry out atomizing operation, crushing the molten metal flow into liquid drops under the impact of supersonic argon gas flow, and cooling. The invention provides a powder material which has obvious influence on powder fluidity and yield due to the temperature of a gas medium in the powder preparation process, and has good sphericity, good fluidity and low oxygen content through multi-process coupling optimization design. However, this patent does not describe a specific apparatus capable of carrying out the process.
The Chinese utility model patent with the publication number of CN208976837U discloses a "production system for atomizing vanadium-titanium iron powder", which comprises an intermediate frequency electric furnace, an atomizing charging tank for receiving vanadium-titanium molten steel in the intermediate frequency electric furnace, a high pressure water pump for atomizing the molten steel flowing down from a leakage hole of the atomizing charging tank, and a temperature control system for controlling the temperature of the vanadium-titanium molten steel in the atomizing charging tank, wherein an atomizer is arranged below the atomizing charging tank, the leakage hole extends into the atomizer, an atomizing nozzle of the high pressure water pump extends into the atomizer, and a receiving hopper is arranged below the atomizer; the temperature control system comprises a controller, a temperature measuring instrument and a medium-frequency heating coil, and the controller is electrically connected with the temperature measuring instrument; set up refractory material on the jar body inside lining of atomizing charging tank, the setting of intermediate frequency heating coil around jar external wall, intermediate frequency heating coil is connected with the power, controller and power electrical connection. The system can realize the production of vanadium-titanium atomized iron powder with various performance standards. However, this technique cannot control the shape of the iron powder, that is, spherical metal powder cannot be obtained.
Disclosure of Invention
The invention provides a gas atomization preparation device and method of spherical metal powder, which can be used for preparing the spherical metal powder, and has the advantages of relatively simple device structure and preparation process, easiness in operation and lower preparation cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas atomization preparation device of spherical metal powder comprises a gas atomization nozzle, a vacuum chamber, a metal powder collector and a high-temperature high-pressure gas pipeline; the gas atomizing nozzle is fixed at the top of the vacuum chamber and consists of a shell, a heating device and a molten metal pouring gate; an annular gas flow channel is arranged in the shell, a heating device is arranged in the annular gas flow channel, a preheated high-pressure inert gas inlet is arranged on the outer side of the shell, and a high-temperature high-pressure gas pipeline is communicated with the annular gas flow channel through the preheated high-pressure inert gas inlet; a molten metal pouring gate is arranged at the inner side of the annular gas flow channel in the middle of the shell, a vertical molten metal flow channel is arranged at the molten metal pouring gate, the upper opening of the molten metal flow channel is a molten metal inlet, and the lower opening of the molten metal flow channel is a molten metal outlet; a high-pressure inert gas nozzle is arranged at the bottom of the shell and corresponds to the molten metal outlet, the inlet end of the high-pressure inert gas nozzle is communicated with the gas flow channel, and the outlet end of the high-pressure inert gas nozzle faces to the lower part of the molten metal outlet; the bottom of the vacuum chamber is provided with a metal powder collector.
The heating device is an electric heating wire, a wire threading hole is formed in the shell, and the electric heating wire is connected with an external power supply through a wire; and a high-temperature resistant insulating lining is arranged in the annular gas flow channel.
The gas atomizing nozzle and the vacuum chamber and the metal powder collector are detachably connected, and sealing structures are respectively arranged at the joints.
The shell of the gas atomizing nozzle is of a middle split structure and consists of an upper shell and a lower shell.
The electric heating wires are provided with a plurality of groups; the high-temperature high-pressure gas pipelines are arranged in a plurality and are uniformly arranged along the circumferential direction of the shell.
The molten metal pouring gate is a conical body, and the diameter of an upper opening is larger than that of a lower opening; the bottom surface of the molten metal pouring gate is higher than the bottom surface of the shell, and the bottom surface of the shell corresponding to the outer side of the molten metal pouring gate is a conical surface with a high middle part and a low outer side part; the high-pressure inert gas nozzles are multiple and are uniformly arranged on the conical surface along the circumferential direction.
The high-pressure inert gas nozzle is a Laval circular seam nozzle.
A gas atomization preparation method of spherical metal powder comprises the following steps:
1) Preheating high-pressure normal-temperature inert gas with the pressure of 3-10 atm to 300-600 ℃ to obtain preheated high-pressure inert gas;
2) After preheating, high-pressure inert gas enters an annular gas flow channel of the gas atomizing nozzle through a high-temperature high-pressure gas pipeline and is further heated to 500-800 ℃ by a heating device;
3) The molten metal enters the vacuum chamber through a molten metal flow channel of the molten metal pouring gate, and is impacted into metal liquid drops with the diameter less than 70 microns by supersonic speed high-temperature inert gas emitted by the high-pressure inert gas nozzle when flowing out of a molten metal outlet; under the impact of high-pressure inert gas, the metal liquid drops are in irregular shapes;
4) The metal liquid drops become spherical or nearly spherical due to the action of surface tension in the process of continuously falling;
5) In the subsequent falling process of the spherical or near-spherical metal liquid drops, cooling and solidifying spherical or near-spherical metal powder, and falling into a metal powder collector below;
6) And screening the collected metal powder to obtain spherical metal powder.
Compared with the prior art, the invention has the beneficial effects that:
1) A heating device is arranged in an annular gas flow passage of the gas atomizing nozzle shell, and jet gas is heated to a high temperature of more than 600 ℃, so that the metal liquid is still in a liquid state after being crushed, the metal liquid drops recover to be spherical or nearly spherical due to the action of surface tension in the further falling process, and the metal liquid drops are cooled and solidified into spherical or nearly spherical metal powder in the following falling process;
2) The device structure and the preparation process are relatively simple, the operation is easy, and the preparation cost is low.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for preparing spherical metal powder by gas atomization according to the present invention.
In the figure: 1. an upper shell 2, a lower shell 3, an electric heating wire 4, a high-pressure inert gas nozzle 5, a molten metal sprue 6, a lead 7, a high-temperature high-pressure gas pipeline 8, a vacuum chamber 9, a high-temperature resistant insulating liner 10, a preheated high-pressure inert gas inlet
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the apparatus for preparing spherical metal powder by gas atomization of the present invention comprises a gas atomization nozzle, a vacuum chamber 8, a metal powder collector and a high temperature and high pressure gas pipeline 7; the gas atomizing nozzle is fixed at the top of the vacuum chamber 8 and consists of a shell, a heating device and a molten metal pouring gate 5; an annular gas flow channel is arranged in the shell, a heating device is arranged in the annular gas flow channel, a preheated high-pressure inert gas inlet 10 is arranged on the outer side of the shell, and a high-temperature high-pressure gas pipeline 7 is communicated with the annular gas flow channel through the preheated high-pressure inert gas inlet 10; a molten metal pouring gate 5 is arranged at the inner side of the annular gas flow channel in the middle of the shell, the molten metal pouring gate 5 is provided with a vertical molten metal flow channel, the upper opening of the molten metal flow channel is a molten metal inlet, and the lower opening of the molten metal flow channel is a molten metal outlet; a high-pressure inert gas nozzle 4 is arranged at the bottom of the shell and corresponds to the molten metal outlet, the inlet end of the high-pressure inert gas nozzle 4 is communicated with the gas flow channel, and the outlet end faces to the lower part of the molten metal outlet; the bottom of the vacuum chamber 8 is provided with a metal powder collector.
The heating device is an electric heating wire 3, a wire threading hole is formed in the shell, and the electric heating wire 3 is connected with an external power supply through a wire 6; and a high-temperature resistant insulating lining 9 is arranged in the annular gas flow passage.
The gas atomizing nozzle and the vacuum chamber 8, and the vacuum chamber 8 and the metal powder collector are detachably connected, and sealing structures are respectively arranged at the joints.
The shell of the gas atomizing nozzle is of a middle split structure and consists of an upper shell 1 and a lower shell 2.
The electric heating wires 3 are provided with a plurality of groups; the high-temperature high-pressure gas pipelines 7 are arranged in a plurality and are uniformly arranged along the circumferential direction of the shell.
The molten metal pouring gate 5 is a conical body, and the diameter of an upper opening is larger than that of a lower opening; the bottom surface of the molten metal pouring gate 5 is higher than the bottom surface of the shell, and the bottom surface of the shell corresponding to the outer side of the molten metal pouring gate 5 is a conical surface with a high middle part and a low outer side; the high-pressure inert gas nozzles 4 are arranged on the conical surface uniformly along the circumferential direction.
The high-pressure inert gas nozzle 4 is a Laval circular seam nozzle.
A gas atomization preparation method of spherical metal powder comprises the following steps:
1) Preheating high-pressure normal-temperature inert gas with the pressure of 3-10 atmospheric pressures to 300-600 ℃ to obtain preheated high-pressure inert gas;
2) After preheating, high-pressure inert gas enters an annular gas flow channel of the gas atomizing nozzle through a high-temperature high-pressure gas pipeline 7 and is further heated to 500-800 ℃ by a heating device;
3) The molten metal enters a vacuum chamber 8 through a molten metal runner of the molten metal pouring gate 5, and is impacted into metal liquid drops with the diameter less than 70 microns by supersonic speed high-temperature inert gas emitted by a high-pressure inert gas nozzle when flowing out of a molten metal outlet; under the impact of high-pressure inert gas, the metal liquid drops are in irregular shapes;
4) The metal liquid drop is spherical or nearly spherical due to the surface tension in the process of continuously falling;
5) In the subsequent falling process of the spherical or near-spherical metal liquid drops, cooling and solidifying spherical or near-spherical metal powder, and falling into a metal powder collector below;
6) And screening the collected metal powder to obtain spherical metal powder.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
As shown in fig. 1, in this embodiment, the housing of the gas atomizing nozzle is composed of an upper housing 1 and a lower housing 2, an electric heating wire 3 is arranged in an annular gas flow passage of the housing, and an insulating lining 9 is adhered to the inner wall of the housing outside the annular gas flow passage. The bottom of the gas atomization nozzle is sequentially connected with the vacuum chamber 8 and the metal powder collector 8 in a sealing way. The molten metal gate 5 is installed in the middle of the gas atomizing nozzle. 2 high-temperature high-pressure gas pipelines 7 are relatively welded on the shell outside the preheated high-pressure inert gas inlet 10 to form a closed gas inlet channel. The high-pressure inert gas nozzle 4 adopts a Laval circular seam nozzle.
In this embodiment, the preparation of 304 stainless steel powder by using the gas atomization preparation apparatus for spherical metal powder provided by the invention comprises the following specific processes:
1. preheating high-pressure normal-temperature argon to 400-450 ℃, wherein the pressure of the argon is 5 atmospheric pressures;
2. the preheated argon enters the shell of the gas atomization nozzle through a high-temperature high-pressure gas pipeline 7 and is further heated to 650-700 ℃ by an electric heating wire 3;
3. the 304 stainless steel liquid enters the vacuum chamber 8 through the molten metal gate 5, and after flowing out of a molten metal outlet, the molten stainless steel is impacted into 304 stainless steel liquid drops by supersonic speed high-temperature argon emitted by the Laval circular seam nozzle, and under the impact action of gas, the 304 stainless steel liquid drops have irregular shapes, some flat shapes and some spindle shapes. Because the jet gas is high-temperature gas, the 304 stainless steel liquid is still in a liquid state after being crushed;
4. the 304 stainless steel liquid drop becomes spherical or nearly spherical due to the surface tension in the further falling process;
5. in the next falling process, the 304 stainless steel liquid drops are cooled and solidified into spherical or nearly spherical 304 stainless steel powder, and fall into a metal powder collector;
6. and screening to obtain spherical 304 stainless steel powder with particle size less than 50 microns, wherein the sphericity rate reaches 95.7%.
[ example 2 ]
In this embodiment, the same apparatus for preparing 316 stainless steel powder by gas atomization of spherical metal powder as in embodiment 1 is used, and the specific process is as follows:
1. preheating high-pressure normal-temperature argon to 500-550 ℃, wherein the pressure of the argon is 5 atmospheric pressures;
2. the preheated argon enters the gas atomization nozzle shell through a high-temperature high-pressure gas pipeline 7 and is further heated to 750-780 ℃ by an electric heating wire 3;
3. the 316 stainless steel liquid enters the vacuum chamber 8 through the molten metal pouring gate 5, and after the molten steel flows out from the molten metal outlet, the molten steel is impacted into metal droplets by supersonic high-temperature argon gas ejected by a Laval circular seam nozzle, and under the impact action of gas, the 316 stainless steel liquid droplets have irregular shapes, some are flat and some are spindle-shaped. Because the jet gas is high-temperature gas, the 316 stainless steel liquid is still in a liquid state after being crushed;
4. the 316 stainless steel liquid drop becomes spherical or nearly spherical due to the surface tension in the further falling process;
5. in the next falling process, the 316 stainless steel liquid drops are cooled and solidified into spherical or nearly spherical 316 stainless steel powder, and then fall into a metal powder collector;
6. spherical 316 stainless steel powder with the grain diameter less than 60 microns is obtained by screening, and the sphericity rate reaches 94.9 percent.
[ example 3 ]
In this embodiment, the same apparatus for preparing spherical metal powder by gas atomization as in embodiment 1 is used to prepare pure aluminum powder, and the specific process is as follows:
1. preheating high-pressure normal-temperature argon to 400-450 ℃, wherein the pressure of the argon is 4.5 atmospheric pressures;
2. the preheated argon enters the shell of the gas atomization nozzle through a high-temperature high-pressure gas pipeline 7 and is further heated to 530-580 ℃ by an electric heating wire 3;
3. the molten aluminum enters the vacuum chamber 8 through the molten metal pouring gate 5, and after flowing out of a molten metal outlet, the molten aluminum is impacted into metal droplets by supersonic high-temperature argon emitted by the Laval circular seam nozzle, and the molten aluminum droplets have irregular shapes, some flat and some spindle shapes under the impact action of gas. Because the jet gas is high-temperature gas, the aluminum liquid is still in a liquid state after being crushed;
4. the aluminum liquid drops become spherical or nearly spherical due to the action of surface tension in the further falling process;
5. in the next falling process, the aluminum liquid drops are cooled and solidified into spherical or nearly spherical aluminum powder, and the spherical or nearly spherical aluminum powder drops into a metal powder collector;
6. and (3) screening to obtain spherical aluminum powder with the particle size of less than 45 micrometers, wherein the sphericity rate reaches 93.0%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The gas atomization preparation method of the spherical metal powder is characterized by being realized based on a gas atomization preparation device, wherein the gas atomization preparation device comprises a gas atomization nozzle, a vacuum chamber, a metal powder collector and a high-temperature high-pressure gas pipeline; the gas atomizing nozzle is fixed at the top of the vacuum chamber and consists of a shell, a heating device and a molten metal pouring gate; an annular gas flow passage is arranged in the shell, a heating device is arranged in the annular gas flow passage, a preheated high-pressure inert gas inlet is arranged on the outer side of the shell, and a high-temperature high-pressure gas pipeline is communicated with the annular gas flow passage through the preheated high-pressure inert gas inlet; a molten metal pouring gate is arranged at the inner side of the annular gas flow channel in the middle of the shell, a vertical molten metal flow channel is arranged at the molten metal pouring gate, the upper opening of the molten metal flow channel is a molten metal inlet, and the lower opening of the molten metal flow channel is a molten metal outlet; a high-pressure inert gas nozzle is arranged at the bottom of the shell and corresponds to the molten metal outlet, the inlet end of the high-pressure inert gas nozzle is communicated with the gas flow channel, and the outlet end of the high-pressure inert gas nozzle faces to the lower part of the molten metal outlet; the bottom of the vacuum chamber is provided with a metal powder collector;
the gas atomization preparation method of the spherical metal powder comprises the following steps:
1) Preheating high-pressure normal-temperature inert gas with the pressure of 3-10 atm to 300-600 ℃ to obtain preheated high-pressure inert gas;
2) After preheating, high-pressure inert gas enters an annular gas flow channel of the gas atomizing nozzle through a high-temperature high-pressure gas pipeline and is further heated to 500-800 ℃ by a heating device;
3) The molten metal enters the vacuum chamber through a molten metal flow channel of the molten metal pouring gate, and is impacted into metal liquid drops with the diameter less than 70 microns by supersonic speed high-temperature inert gas emitted by the high-pressure inert gas nozzle when flowing out of a molten metal outlet; under the impact of high-pressure inert gas, the metal liquid drops are in irregular shapes;
4) The metal liquid drop is spherical or nearly spherical due to the surface tension in the process of continuously falling;
5) In the subsequent falling process of the spherical or near-spherical metal liquid drops, cooling and solidifying spherical or near-spherical metal powder, and falling into a metal powder collector below;
6) And screening the collected metal powder to obtain spherical metal powder.
2. The method for preparing spherical metal powder through gas atomization of claim 1, wherein the heating device is an electric heating wire, a wire threading hole is formed in the shell, and the electric heating wire is connected with an external power supply through a wire; and a high-temperature resistant insulating lining is arranged in the annular gas flow passage.
3. The method according to claim 1, wherein the gas atomizing nozzle and the vacuum chamber, and the vacuum chamber and the metal powder collector are detachably connected, and the joints are respectively provided with a sealing structure.
4. The method of claim 1, wherein the housing of the atomizing nozzle is a split structure comprising an upper housing and a lower housing.
5. The method for preparing spherical metal powder through gas atomization according to claim 2, wherein the electric heating wires are provided with a plurality of groups; the high-temperature high-pressure gas pipelines are arranged in a plurality and are uniformly arranged along the circumferential direction of the shell.
6. The gas atomization preparation method of spherical metal powder as claimed in claim 1, wherein the molten metal gate is a cone, and the diameter of the upper opening is larger than that of the lower opening; the bottom surface of the molten metal pouring gate is higher than the bottom surface of the shell, and the bottom surface of the shell corresponding to the outer side of the molten metal pouring gate is a conical surface with a high middle part and a low outer side part; the high-pressure inert gas nozzles are uniformly arranged on the conical surface along the circumferential direction.
7. The method of claim 1, wherein the high pressure inert gas nozzle is a laval circular seam nozzle.
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| CN114012101A (en) * | 2021-09-30 | 2022-02-08 | 山西省化工研究所（有限公司） | Preparation method of high-strength high-toughness stainless steel powder for selective laser melting additive manufacturing |
| CN114653955A (en) * | 2022-02-12 | 2022-06-24 | 山东汇嘉磁电科技有限公司 | Gas atomization powder making method and gas atomization powder making system using same |
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| AT410640B (en) * | 2000-07-07 | 2003-06-25 | Tribovent Verfahrensentwicklg | METHOD AND DEVICE FOR SPRAYING METAL MELT |
| CN202147010U (en) * | 2010-12-27 | 2012-02-22 | 山东信发金属粉末有限公司 | Pneumatic atomizer with heater for producing metal powder |
| CN204075228U (en) * | 2014-10-15 | 2015-01-07 | 江西悦安超细金属有限公司 | A kind of supersonic gas powder by atomization gas heating system device |
| CN206145974U (en) * | 2016-10-20 | 2017-05-03 | 中国科学院金属研究所 | Gaseous heating device of atomizing and pulverizing equipment |
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