CN116511493B - Device and method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder - Google Patents
Device and method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 206
- 239000002184 metal Substances 0.000 title claims abstract description 78
- 238000010494 dissociation reaction Methods 0.000 title claims abstract description 30
- 230000005593 dissociations Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 13
- 238000010926 purge Methods 0.000 claims abstract description 13
- 238000005054 agglomeration Methods 0.000 claims abstract description 7
- 230000002776 aggregation Effects 0.000 claims abstract description 7
- 150000002500 ions Chemical class 0.000 claims description 43
- 238000010884 ion-beam technique Methods 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 14
- 229910001111 Fine metal Inorganic materials 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims 1
- 238000013022 venting Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005411 Van der Waals force Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000011858 nanopowder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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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
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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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
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Abstract
The invention relates to the technical field of metal powder material preparation processes, and discloses a device and a method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder. Aims to solve the technical problems that the fluidity improving effect of the superfine metal powder is poor, the superfine metal powder is easy to generate space agglomeration, and the whole fluidity of the powder is influenced macroscopically in the prior art. The invention comprises a powder cylinder with an internal cavity; the powder cylinder is provided with a powder inlet pipeline, a powder outlet and an air inlet and outlet pipeline; the powder inlet pipeline is provided with a closed valve, and the air inlet pipeline is provided with a screen component; a screw rod, an ion source and a purging component are arranged in the cavity inside the powder cylinder; the screw rod is connected with a driving motor which can drive the screw rod to rotate. By adopting the device and the process method, the agglomerated ultrafine metal powder without Hall flow rate is enabled to have Hall flow rate again, so that the fluidity of the ultrafine metal powder with D95<20 mu m is recovered, and the yield of the Hall flow inspection powder is more than or equal to 95%.
Description
Technical Field
The invention relates to the technical field of metal powder material preparation processes, in particular to a device and a method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder.
Background
In recent years, heat exchange devices for the fields of aerospace, energy, military industry and the like in China are gradually developed towards the directions of high precision, high conformality, light weight and small special essence, so that the additive manufacturing technology using metal powder with the particle size of 15-53 μm in the prior art cannot meet the preparation capability of a micro heat dissipation device with a complex flow path, and with the development of micro nano additive manufacturing equipment in recent years, the market is urgent to need 1-20 μm superfine metal powder with excellent fluidity. Besides the additive manufacturing industry, china is used as a large country of powder metallurgy, and has great market demands on superfine metal spherical powder with fluidity in the technical fields of metal powder flux-cored wires, powder hot press forming and the like. At present, the prior art has poor fluidity improving effect on ultrafine spherical metal powder, and the reason for losing fluidity is that the ultrafine metal powder has larger specific surface energy, so that Van der Waals force among the powder is taken as main attractive force at the moment, and the Van der Waals force of the ultrafine metal powder is even larger than the gravity of the powder, so that space aggregation occurs among the powder, and the whole fluidity of the powder is influenced macroscopically.
Therefore, it is necessary to design an anti-agglomeration device for superfine metal powder and develop a matched superfine powder fluidity reproduction process method.
Disclosure of Invention
In view of the above technical problems, the present disclosure provides a device and a method for airflow dispersion-ion dissociation of ultra-fine metal powder agglomeration, which solve the technical problems in the prior art that the fluidity improvement effect of ultra-fine metal powder is poor, the ultra-fine metal powder is easy to spatially agglomerate, and the overall fluidity of the powder is affected macroscopically.
According to one aspect of the present disclosure, there is provided an apparatus for gas flow dispersion-ion dissociation of ultra-fine metal powder agglomerates, comprising a powder cylinder having an internal cavity; the powder cylinder is provided with a powder inlet pipeline, a powder outlet and an air inlet and outlet pipeline; the powder inlet pipeline is provided with a closed valve, and the air inlet pipeline is provided with a screen component; a screw rod, an ion source capable of spraying charged ions in multiple directions and a purging component capable of spraying inert gas at a specific angle are arranged in the inner cavity of the powder cylinder; the screw rod is connected with a driving motor which can drive the screw rod to rotate, the ion source comprises a plurality of ion nozzles, and the purging component comprises a plurality of air flow nozzles; the ion source and the purging component are arranged on the inner side surface of the powder cylinder; the spiral rod rotates to throw out ultrafine metal powder, and the throwing direction is in a quasi-orthogonal state with the direction of the air flow sprayed out by the annular air flow dispersing device.
In some embodiments of the disclosure, the powder cylinder is of an inverted truncated cone structure, the powder inlet pipeline is arranged above the powder cylinder, the powder outlet is arranged below the powder cylinder, the air inlet and outlet pipeline is arranged at the side of the powder cylinder, and one end of the screw rod penetrates through the upper surface of the powder cylinder and is externally connected with the driving motor.
In some embodiments of the present disclosure, the purge component further includes an annular airflow dispersing device and a driving motor for controlling the airflow direction ejected by the airflow nozzles, and the annular array of airflow nozzles is disposed outside the annular airflow dispersing device.
In some embodiments of the present disclosure, the screw rod includes a screw shaft and a screw blade provided at a periphery of the screw shaft.
In some embodiments of the present disclosure, the screen member comprises a screen mesh having a mesh diameter of between 2 and 3 μm.
In some embodiments of the disclosure, the ion source further includes an annular ion beam device and a driving motor for controlling ion direction ejected by the ion nozzles, wherein the annular array of ion nozzles is arranged outside the annular ion beam device; the annular ion beam equipment is provided with two ion beam devices, one ion beam device is arranged on the upper surface of the inner side of the powder cylinder, and the other ion beam device is arranged on the side wall of the inner side of the powder cylinder.
In some embodiments of the present disclosure, a vibrator is mounted outside the powder cylinder and is rapped once every 3 minutes to remove ultra-fine metal powder adhered to the inside surface of the powder cylinder.
According to another aspect of the present disclosure, there is provided a method for reproducing fluidity of ultra-fine metal powder, using an apparatus for gas flow dispersion-ion dissociation of ultra-fine metal powder agglomeration, comprising the steps of:
(1) Powder filling: filling superfine metal powder with D95 less than 20 mu m into a powder cylinder through a powder inlet pipeline, and closing a closed valve;
(2) Ventilation and exhaust: repeatedly introducing N2 with the total volume of more than 2/3 into the powder cylinder through the air inlet and outlet pipeline, discharging in the follow-up process, and reciprocating for at least 3 periods;
(3) Stirring: starting a driving motor, setting the output rotating speed of the driving motor between 100 and 120r/min, and setting the helix angle of a helical blade to be 45 degrees; the driving motor drives the screw rod to rotate, so that the superfine metal powder at the bottom of the powder cylinder is separated from the screw rod at a high speed and is thrown out along the screw blade at a high speed, the throwing direction is in a quasi-orthogonal state with the direction of the air flow sprayed out by the annular air flow dispersing device, the space dissociation of the superfine metal powder is further realized, and meanwhile, the superfine metal powder is driven by the resultant force of the action of the superfine metal powder to move discretely towards the upper part of the powder cylinder;
(4) Gas injection: the annular airflow dispersing device is arranged to spray N through the airflow nozzle 2 The jet pressure is more than 0.5Mpa, the jet direction is perpendicular to the inner tangent plane of the annular airflow dispersing device where the nozzle is positioned, and the error range is +/-3 degrees;
(5) Ion spraying: the annular ion beam devices are arranged to continuously spray N+ for 30-60 min, the ion spraying wind speed is more than or equal to 0.5m/s, and the N+ sprayed by the two annular ion beam devices is close to the superfine metal powder in discrete motion along two directions, so that the superfine metal powder in discrete motion has forward charges, a mutual repulsive effect is generated, and the secondary dissociation of the superfine metal powder is realized;
(6) And (3) screening: the diameter of the mesh of the filter screen provided with the air inlet and outlet pipeline is 2-3 mu m, and ultrafine metal powder with the diameter smaller than 1 mu m is sieved out.
The invention has the beneficial effects that:
1. by adopting the device and the process method, the agglomerated ultrafine metal powder without Hall flow rate is enabled to have Hall flow rate again, so that the fluidity of the ultrafine metal powder with D95 less than 20 mu m is recovered, and the yield of the Hall flow inspection powder is more than or equal to 95%;
2. the powder inlet pipeline is provided with the airtight valve, so that the external environment can be isolated, and the sealing performance is reliable;
3. the air inlet and outlet pipeline is provided with the filter screen, the mesh diameter of the filter screen is between 2 and 3 mu m, so that excessive loss of secondary dissociated ultrafine powder along with air flow in the powder cylinder through the air inlet and outlet pipeline caused by overlarge mesh diameter is avoided, the powder yield is effectively ensured to be more than or equal to 95%, meanwhile, the air separation screening effect is achieved on nano powder below 1 mu m, and the phenomenon that the nano powder is agglomerated with other powder again due to Van der Waals force after later sedimentation is effectively avoided;
4. the annular airflow dispersing equipment is arranged to spray N through the nozzle 2 The jet pressure is more than 0.5Mpa, the jet direction is perpendicular to the inner tangent plane of the annular airflow dispersing device where the nozzle is positioned, and the error range is +/-3 degrees; setting the helix angle of the helical blade to be 45 degrees, setting the output rotating speed of the driving motor to drive the helical rod to rotate between 100 and 120r/min, so that the superfine metal powder at the bottom of the powder cylinder is carried out at a high speed, and is thrown out along the helical blade, the throwing direction is in a quasi-orthogonal state with the air flow direction of the ion nozzle of the annular air flow dispersing device, so that the space dissociation of the superfine metal powder is realized, and meanwhile, the superfine powder is driven to move discretely towards the upper part of the powder cylinder by the resultant force of the action of the superfine metal powder;
5. two annular ion beam devices are arranged to continuously spray N+ for 30-60 min, the spraying speed is more than or equal to 0.5m/s, and the N+ sprayed along the two directions is randomly close to the superfine powder in discrete motion, so that the superfine metal powder in discrete motion has forward charges, a mutual repulsive effect is generated, and the secondary dissociation of the superfine metal powder is realized;
6. repeatedly introducing N2 with the total volume of more than 2/3 into the powder cylinder through the air inlet and outlet pipeline, discharging in the follow-up process, and reciprocating for at least 3 periods; so as to reduce the oxygen content in the powder cylinder as soon as possible and improve the working efficiency.
Drawings
FIG. 1 is a schematic diagram of an apparatus for gas flow dispersion-ion dissociation of ultra-fine metal powder agglomerates;
the names of the components in the figure are as follows: 1. a powder cylinder; 2. a powder inlet pipeline; 3. a powder outlet; 4. an air inlet and outlet pipeline; 5. a closed valve; 6. a filter screen; 7. a screw rod; 71. a screw shaft; 72. a helical blade; 8. a ring-shaped ion beam device; 81. an ion nozzle; 9. an annular airflow dispersion device; 91. an air flow nozzle; 10. a driving motor; 11. a vibrator.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1
9. The present example discloses an apparatus for air flow dispersion-ion dissociation of ultra-fine metal powder agglomeration, see fig. 1, comprising a powder cylinder 1 having an internal cavity; the powder cylinder 1 is provided with a powder inlet pipeline 2, a powder outlet 3 and an air inlet and outlet pipeline 4; a closed valve 5 is arranged on the powder inlet pipeline 2, and a screen component is arranged on the air inlet pipeline 4; the internal cavity of the powder cylinder 1 is internally provided with a screw rod 7, an ion source capable of ejecting charged ions in a plurality of directions and a purging component capable of ejecting inert gas at a specific angle; the ion source comprises a number of ion nozzles 81 and the purge component comprises a number of gas flow nozzles 91; the screw rod 7 is connected with a driving motor 10 which can drive the screw rod to rotate, and the ion source and the purging component are annularly arranged on the inner side surface of the powder cylinder 1; the spiral rod 7 rotates to throw out ultrafine metal powder, and the throwing direction is in a quasi-orthogonal state with the direction of the air flow sprayed out by the annular air flow dispersing device 9. The powder cylinder 1 is of an inverted truncated cone-shaped structure, the powder inlet pipeline 2 is arranged above the powder cylinder 1, the powder outlet 3 is arranged below the powder cylinder 1, the air inlet and outlet pipeline 4 is arranged on the side of the powder cylinder 1, one end of the screw rod 7 penetrates through the upper surface of the powder cylinder 1, and the screw rod is externally connected with the driving motor 10. The purging component further comprises an annular airflow dispersing device 9 and a driving motor capable of controlling the airflow direction sprayed by the airflow nozzles, the airflow nozzles 91 are annularly arranged on the outer side of the annular airflow dispersing device 9, and the annular airflow dispersing device 9 comprises at least one row of annularly arranged nozzles. The screw rod 7 includes a screw shaft 71 and screw blades 72 provided at the periphery of the screw shaft 71. The screen member comprises a screen mesh 6, the mesh diameter of the screen mesh 6 being between 2 and 3 μm. The ion source also comprises annular ion beam equipment 8 and a driving motor which can control the ion direction ejected by the ion nozzle 81, and the annular array of the ion nozzles 81 is arranged outside the annular ion beam equipment; the annular ion beam device is provided with two, one is arranged on the upper surface of the inner side of the powder cylinder, the other is arranged on the side wall of the inner side of the powder cylinder, and the annular ion beam device 8 comprises at least one row of nozzles which are distributed in an annular mode; the annular ion beam device 8 is provided with two ion beam devices, one ion beam device is arranged on the upper surface of the inner side of the powder cylinder 1, and the other ion beam device is arranged on the side wall of the inner side of the powder cylinder 1. A vibrator 11 is arranged on the outer side of the powder cylinder 1 to shake and remove the superfine metal powder adhered on the inner side surface of the powder cylinder 1.
Example 2
The embodiment discloses a superfine metal powder fluidity reproduction method, which is applicable to the device for air flow dispersion-ion dissociation superfine metal powder agglomeration in the embodiment 1; the method comprises the following steps:
(1) Powder filling: ultrafine metal powder with D95 less than 20 mu m is filled into the powder cylinder 1 through the powder inlet pipeline 2, and the closed valve 5 is closed;
(2) Ventilation and exhaust: repeatedly introducing N2 with the total volume of more than 2/3 into the powder cylinder through the air inlet and outlet pipeline, discharging in the follow-up process, and reciprocating for at least 3 periods; so as to reduce the oxygen content in the powder cylinder as soon as possible;
(3) Stirring: starting the driving motor 10, setting the output rotating speed of the driving motor 10 between 100 and 120r/min, and setting the helix angle of the helical blade 72 to be 45 degrees; the driving motor 10 drives the screw rod 7 to rotate, so that the superfine metal powder at the bottom of the powder cylinder 1 is separated from the screw rod at a high speed and is thrown out along the screw blades 72 at a high speed, the throwing direction is in a quasi-orthogonal state with the air flow direction sprayed by the annular air flow dispersing equipment 9, the space dissociation of the superfine metal powder is further realized, and meanwhile, the superfine metal powder is forced to move discretely towards the upper part of the powder cylinder 1 by the action resultant force of the superfine metal powder;
(4) Gas injection: the annular airflow dispersing device 9 is arranged to spray N2 through a nozzle, the air spraying pressure is more than 0.5Mpa, the air spraying direction is perpendicular to the inner cutting surface of the annular airflow dispersing device 9 where the nozzle is positioned, and the error range is +/-3 degrees;
(5) Ion spraying: the annular ion beam devices 8 are arranged to continuously spray N+ for 30-60 min, the spraying speed is more than or equal to 0.5m/s, and N+ sprayed by the two annular ion beam devices 8 is close to the superfine metal powder in discrete motion along two directions, so that the superfine metal powder in discrete motion has forward charges, a mutual repulsive effect is generated, and secondary dissociation of the superfine metal powder is realized;
(6) And (3) screening: the diameter of the mesh of the filtering screen 6 arranged on the air inlet and outlet pipeline 4 is 2-3 mu m, and ultrafine metal powder with the diameter smaller than 1 mu m is sieved out.
When the output rotation speed of the driving motor 10 is less than 100r/min, the speed of throwing the superfine metal powder out of the spiral blade 72 along the spiral angle of 45 degrees is insufficient, the superfine metal powder is easy to gather above the spiral blade 72 under the driving of the air flow sprayed out by the annular air flow dispersing device 9, a dispersion state cannot be formed in the upper area of the powder cylinder 1, and the fluidity recovery effect is reduced. When the output rotation speed is more than 120r/min, the kinetic energy of the ultrafine metal powder which is thrown out of the spiral blade 72 along the spiral angle of 45 degrees is too large, and most of ultrafine metal powder is thrown to the inner wall of the conical area at the lower part of the powder cylinder 1 by the spiral blade 72, so that the ultrafine metal powder is secondarily settled to the bottom, and the fluidity recovery is also not facilitated. Therefore, the optimum output rotational speed of the drive motor 10 is preferably between 100 and 120 r/min.
The radius of the upper surface and the radius of the lower surface of the powder cylinder 1 are not more than 20mm. (if the diameter is larger than 20mm, the normal deviation between the air flow direction at the air flow nozzle 91 and the inner side surface of the powder cylinder becomes larger, the resultant force direction of the action on the superfine metal powder is influenced, and the ion direction at the ion nozzle 81 is the same, the secondary dissociation effect of the superfine metal powder at the upper part of the powder cylinder 1 is also influenced.)
When the ion wind speed of the ion sprayed by the annular ion beam device 8 is less than 0.5m/s, the action range of the ion wind is narrowed, and the effect of secondary dissociation is obviously reduced. Meanwhile, when the action time of the ion wind is less than 30min, the secondary dissociation effect is also reduced. When the action time of the ion wind is longer than 60min, although a better secondary dissociation effect is achieved, most of nano-scale dust particles are filtered out by the filter screen 6 while the available powder with the particle size of 1-3 mu m is filtered out due to the driving of the protective air flow in the air inlet and outlet pipeline 4, so that the powder yield is reduced.
The device for agglomerating the superfine metal powder by using airflow dispersion and ion dissociation is used, the output rotating speed of a driving motor 10 is set to be between 100 and 120r/min, the air injection pressure of annular airflow dispersing equipment 9 is set to be between 0.5 and 1Mpa, and under the process that the air speed of ions ejected by a nozzle of annular ion beam equipment 8 is more than or equal to 0.5m/s and the action time is 30 to 60min, the fluidity of the superfine metal powder with D95 less than 20 mu m is recovered, and the yield of Hall flow test powder is more than or equal to 95 percent.
The powder yield was evaluated for Hall flow for ultra-fine metal powders with D95<20 μm, and the specific test data are shown in Table 1.
TABLE 1 Hall flow evaluation powder yield test Table for ultra-fine metal powder having D95<20 μm
While certain preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, the present invention is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. An apparatus for agglomerating air flow dispersion-ion dissociation ultrafine metal powder, which is characterized in that: comprises a powder cylinder with an inner cavity; the powder cylinder is provided with a powder inlet pipeline, a powder outlet and an air inlet and outlet pipeline; the powder inlet pipeline is provided with a closed valve, and the air inlet pipeline is provided with a screen component; a screw rod, an ion source capable of spraying charged ions in multiple directions and a purging component capable of spraying inert gas at a specific angle are arranged in the inner cavity of the powder cylinder; the screw rod is connected with a driving motor which can drive the screw rod to rotate, the ion source comprises a plurality of ion nozzles, and the purging component comprises a plurality of air flow nozzles; the ion source and the purging component are arranged on the inner side surface of the powder cylinder; the spiral rod rotates to throw out superfine metal powder, and the throwing direction and the annular airflow are separatedThe direction of the airflow sprayed by the dispersing equipment is in a quasi-orthogonal state; the purging component further comprises annular airflow dispersing equipment and a driving motor capable of controlling airflow direction ejected by the airflow nozzles, and the annular array of the airflow nozzles is arranged outside the annular airflow dispersing equipment; thereby realizing the space dissociation of the superfine metal powder; the ion source also comprises annular ion beam equipment and a driving motor which can control the ion direction ejected by the ion nozzles, and the annular array of the ion nozzles is arranged outside the annular ion beam equipment; the annular ion beam device is provided with two ion beam devices, one ion beam device is arranged on the upper surface of the inner side of the powder cylinder, and the other ion beam device is arranged on the side wall of the inner side of the powder cylinder; n ejected by two annular ion beam devices + The superfine metal powder which moves in a discrete manner along two directions is close to the superfine metal powder, so that secondary dissociation of the superfine metal powder is realized; the specific angle refers to the direction of air injection being perpendicular to the inner tangent plane of the annular air flow dispersing device where the nozzle is located.
2. The apparatus for gas flow dispersion-ion dissociation of ultrafine metal powder agglomerates as set forth in claim 1, wherein: the powder jar is of an inverted round table structure, the powder inlet pipeline is arranged above the powder jar, the powder outlet is arranged below the powder jar, the air inlet and outlet pipeline is arranged on the side of the powder jar, one end of the screw rod penetrates through the upper surface of the powder jar, and the screw rod is externally connected with the driving motor.
3. The apparatus for gas flow dispersion-ion dissociation of ultrafine metal powder agglomerates as set forth in claim 1, wherein: the screw rod comprises a screw shaft and screw blades arranged on the periphery of the screw shaft.
4. The apparatus for gas flow dispersion-ion dissociation of ultrafine metal powder agglomerates as set forth in claim 1, wherein: the screen component comprises a screen mesh, and the diameter of the screen mesh is 2-3 mu m.
5. The apparatus for gas flow dispersion-ion dissociation of ultrafine metal powder agglomerates as set forth in claim 1, wherein: a vibrator is arranged on the outer side of the powder cylinder to shake and remove superfine metal powder adhered on the inner side surface of the powder cylinder.
6. A method for reproducing fluidity of ultra-fine metal powder using the apparatus for gas flow dispersion-ion dissociation of ultra-fine metal powder agglomeration according to claim 1, comprising the steps of: (1) powder filling: filling superfine metal powder with D95 less than 20 mu m into a powder cylinder through a powder inlet pipeline, and closing a closed valve; (2) venting and exhausting: repeatedly introducing N with total volume of more than 2/3 into the powder cylinder through the air inlet and outlet pipeline 2 And discharged in the following, reciprocating for at least 3 cycles; reducing the oxygen content in the powder cylinder; (3) stirring: starting a driving motor, setting the output rotating speed of the driving motor to be 100-120 r/min, and setting the helix angle of a helical blade to be 45 degrees; the driving motor drives the screw rod to rotate, so that the superfine metal powder at the bottom of the powder cylinder is separated from the screw rod at a high speed and is thrown out along the screw blade at a high speed, the throwing direction is in a quasi-orthogonal state with the direction of the air flow sprayed out by the annular air flow dispersing device, the space dissociation of the superfine metal powder is further realized, and meanwhile, the superfine metal powder is driven by the resultant force of the action of the superfine metal powder to move discretely towards the upper part of the powder cylinder; (4) Gas spraying, namely, arranging annular gas flow dispersing equipment to spray N through a gas flow nozzle 2 The jet pressure is more than 0.5Mpa, the jet direction is perpendicular to the inner tangent plane of the annular airflow dispersing device where the nozzle is positioned, and the error range is +/-3 degrees; (5) ion spraying: continuous N-spraying device with annular ion beam device + The duration is 30-60 min, the air speed of ejected ions is more than or equal to 0.5m/s, and N is ejected by two annular ion beam devices + The superfine metal powder which moves in a discrete manner along two directions is close to the superfine metal powder which moves in a discrete manner, so that the superfine metal powder which moves in a discrete manner has forward charges, and a mutual repulsive effect is generated, and the superfine metal powder is dissociated secondarily; (6) sieving: the diameter of the mesh of the filter screen mesh of the air inlet and outlet pipeline is 2-3 mu m, and ultrafine metal powder with the diameter smaller than 1 mu m is sieved out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310424012.6A CN116511493B (en) | 2023-04-18 | 2023-04-18 | Device and method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder |
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| CN202310424012.6A CN116511493B (en) | 2023-04-18 | 2023-04-18 | Device and method for agglomerating air flow dispersion-ion dissociation ultrafine metal powder |
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Citations (8)
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| CN116511493A (en) | 2023-08-01 |
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