CN107570719A - Metal powder preparation method and device - Google Patents
Metal powder preparation method and device Download PDFInfo
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- CN107570719A CN107570719A CN201710554320.5A CN201710554320A CN107570719A CN 107570719 A CN107570719 A CN 107570719A CN 201710554320 A CN201710554320 A CN 201710554320A CN 107570719 A CN107570719 A CN 107570719A
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Abstract
The present invention relates to a kind of metal powder preparation method and device, and metal drop beam is formed by transferring raw material silk rod, using thermal spraying generating means, accelerates cooling to be atomized using high speed compression gas front, intermediate powder is obtained by classified filtering device；Recycle the Electromagnetic Heating under high vacuum state and high speed rotating plate is secondary accelerates atomization, may be such that size is tiny, uniform high cleanliness metal dust.
Description
Technical field
The present invention relates to metal powder preparation method, belongs to powder metallurgical technology, in being utilized more particularly to one kind
Between powder, electromagnetic induction coil heating high pure metal powder preparation method and device.
Background technology
3D printing or rapid shaping commonly use metal dust, therefore the metal dust of high quality is 3D printing or rapid shaping
The key of technology development.High quality specifically includes, high cleanliness, high fluidity, size uniformity etc..For simple metal, i.e.,
It is the indexs such as high cleanliness, sphericity height, size uniformity.
Metal dust is prepared to use and is made the methods of chemical method, Mechanical Method and mixing method.The advantage of atomization includes：Powder
Powder material out of roundness is high, and size range is narrow and defect is few.Chemical method and mixing method long flow path, efficiency are low, and powder quality is by more
Kind factor influences, and control difficulty is big.Therefore, atomization has a wide range of application.
Atomization is when preparing the simple metal of the contour ripple living of aluminium, titanium, on the one hand due to easily aoxidizing, therefore obtained powder
Last oxygen content is generally higher；Another aspect powder sphericity is poor.At present, compare shortcoming it is efficient, can be with quantity-produced height
The technology of preparing of quality aluminium powder and titanium valve.
The content of the invention
It is an object of the invention to the preparation method of size uniformity, the metal dust of high cleanliness, solves existing atomization
Method can not draw the problem of high cleanliness work ripple metal dust.
For achieving the above object, the present invention adopts the following technical scheme that：
Metal powder preparation method and device, by continuous conveying raw material thread rod 2, formed using thermal spraying generating means 3
Thermal spray metal molten drop 9, wire feed rate and thermal spraying generator parameter are by flow of the compressed gas gauge 4, compressed gas 5, and control
System 1 processed controls；Thermal spray metal is melted using high-speed gas beam 8 caused by reverse high pressure gas generator 7 in its front
Drop is cooled down and is atomized, and its speed and flow are controlled by cooling gas flowmeter 6.Pass through oxygen sensor 11, pressure sensing
The parameters such as oxygen content, temperature and pressure in 13 real-time detection chambers of device 12 and temperature sensor, and control system 1 is transferred to,
Control system provides the operational factor fed back and adjust key componentses in real time according to internal database.Have in cavity bottom individual
Metal bath and gas vent 10, searched with the metal drop of compressed gas by outlet into filter 14 and intermediate powder
Storage 15, remaining part enter collector 16.Filtering screen size wherein in filter and intermediate powder collector can be according to
It is adjustable according to target size.
Intermediate powder enters vacuum chamber and pressue device 17, is melted under the heating of magnet coil 18, and form powder
Melt drip 19；Drop stream falls under gravity into rotating disk 20, so be thrown out of and pass through refinement again and
Cooling, metal dust 23 is formed, and collected by recovery protection device 21 and powder catcher 22.
Metal powder preparation method and device, vacuum chamber and pressue device include one-level raw material cabin 171, one-level charge door
172, secondary raw materials storehouse 173, inert gas pressurizer 174, inert gas entrance 175, three-level raw material cabin 176, feed opening 177,
And vacuum extractor 17.
Technology is described as follows：
Raw material are used as using raw material thread rod 2, automation, quantity-produced needs can be met.
Thermal spray metal molten drop 9 is formed using thermal spraying generating means 3, the crucible required for can exempting in conventional method melts
Refining, on the one hand realizes continuous production, improves preparation efficiency, has on the other hand also refined molten drop and final powder size.
Wire feed rate and thermal spraying generator parameter are controlled by flow of the compressed gas gauge 4, compressed gas 5, and control system 1
System.Metal drop beam is produced using thermal spraying generator, on the one hand realizes continuous process, another aspect molten drop is high
Pressure, speed is fast, size is small and uniform, is advantageous to improve powder quality；Meanwhile the defects of also reducing final powder rate.Foundation
Metal dust special type, the size of molten drop beam and air pressure can be adjusted by adjusting the parameters such as air pressure, flow.
The wire-feeding rate 10-150g/min of thermal spraying generating means, argon flow amount 12-20L/min, nitrogen flow 10-15L/
Min, electric current 300-600A, voltage 60-100V, hydrogen flowing quantity 0-8L/min, spray away from 80-500mm.
Wire-feeding rate is adjustable, is on the one hand influenceed by metal species, on the other hand needs appropriate electric current and voltage to coordinate, then auxiliary
With appropriate high-speed gas medium.The excessive and too small formation for being all unfavorable for stable metal drop beam of silk feeding quantity.
Argon gas, nitrogen and hydrogen flowing quantity needs are determined according to material category, silk feeding quantity, and stable metal is formed to ensure
Molten drop beam, and metal drop size is in controlled range.
Electric current and voltage needs are determined according to material category and silk feeding quantity, and metal drop is formed to ensure.
Spray determines the size for the metal drop beam to be formed away from 80-500mm.The fusing point according to metal, heat are also required in addition
The physical properties such as conductance it is appropriately selected spray away from.
Accelerate to cool down metal drop beam using high pressure gas beam 8.The gases at high pressure beam 8 is produced by high pressure gas generator 7,
Its speed and flow are controlled by cooling gas flowmeter 6.Gases at high pressure frontal impact cools down metal drop beam, equivalent to one time mist
Change process, on the one hand to having refined metal drop, cooling procedure is also on the other hand accelerated, cool time is shortened, so as to carry
High metal dust preparation efficiency.Have benefited from " secondary-atomizing " process, the defects of metal drop rate can further be reduced, powder
The sphericity at end can be further enhanced.
By oxygen sensor 11, oxygen content, temperature in 13 real-time detection chambers of pressure sensor 12 and temperature sensor
Degree and pressure and other parameters, and control system 1 is transferred to, control system is provided to feed back and adjust in real time according to internal database and closed
The operational factor of key component.Oxygen content directly determines the degree of purity of metal dust, for the metal easily aoxidized,
Need strictly to control oxygen content to obtain high quality powder.Pressure sensor reflects metal drop beam and cooling gas from side
The pressure of the pressure in structure after beam head-on crash, the pressure of metal drop beam and positive cooling gas beam need to oppress mutual
Match somebody with somebody, can just prepare the metal dust of high quality.When either party hypertonia or it is too low when, can all allow cooling procedure uneven
It is even, so as to destroy quality stability.This pressure sensor sharp can detect whether both pressure states match unanimously.When
When occurring inconsistent, he can send signal in time, then control system can give hot spray apparatus and compression gas generator to send out
Go out instruction, and timely adjusting parameter.
There are individual metal bath and gas vent 10 in cavity bottom, entered with the metal drop of compressed gas by exporting
Filter 14 and intermediate powder collect device 15, and remaining part enters terminal collector 16.
Filtering screen size in above-mentioned filter and powder catcher can be adjustable according to target size, so as to accomplish
The beam system of target size powder is standby and collects, and reaches the purpose of flexible preparation.
Intermediate powder enters vacuum chamber and pressue device 17, and it specifically includes one-level raw material cabin 171, one-level charge door
172, secondary raw materials storehouse 173, inert gas pressurizer 174, inert gas entrance 175, three-level raw material cabin 176, feed opening 177,
And vacuum extractor 17.On the one hand the design is to ensure that condition of high vacuum degree, and the high vacuum of vacuum chamber 24 that lower section is connected to
Degree, so that it is guaranteed that high purity metal powder is produced；On the other hand it is to improve flow of powder speed, so as to improve production efficiency.
The powder stream for accelerating to fall forms powder fusing stream 19 under the heating of electromagnetic induction coil 18, in gravity and air-flow
Acceleration under fall into rotating disk 20；Drop in the rotating disk fallen into rotating at a high speed is thrown out of and passes through refinement again and cold
But, metal dust 23 is formed, and is collected by recovery protection device 21 and powder catcher 22.The rotating speed of rotating disk has to powder size
Influence, rotary speed is more fast more is advantageous to refine drop size and powder size.
Advantages of the present invention and beneficial effect：
1. the inventive method uses two benches technology of preparing, i.e., middle powder is obtained using fast and convenient plasma spray technology
End, the high-purity of high cleanliness is then obtained by the electromagnetic induction heating of condition of high vacuum degree, the secondary refinement technology of turntable rotation
Ripple metal dust living.
Brief description of the drawings
Accompanying drawing 1：Schematic device
1 data control system；2 raw material thread rods；3 thermal spraying generating means；4 flow of the compressed gas gauge；5 compressed gas；6 is cold
But gas flowmeter；7 cooling gas generators；8 Fast Cooling air-flows；9 thermal spray metal molten drops；10 metals are molten and gas goes out
Mouthful；11 oxygen sensors；12 pressure sensors；13 temperature sensors；14 filters；15 powder collect device；16 gas samplings
Device；17 powder are filled and pressue device；18 electromagnetic heating coils；19 powder fusing stream；20 rotating disks；21 recovery protection devices；22
Powder catcher；23 are made powder；24 vacuum systems；
Accompanying drawing 2：Powder is filled and pressue device schematic diagram
171 one-level raw material cabins；172 one-level charge doors；173 secondary raw materials storehouses；174 inert gas pressurizers；175 indifferent gas
Body entrance；176 three-level raw material cabins；177 feed openings；178 vacuum extractors；
Embodiment
Technical scheme is further described below in conjunction with preferred embodiment.
Embodiment 1：
Metallic aluminium is prepared, device is as shown in Figure 1.Raw material is the diameter 3.2mm metal aluminum steels of as cast condition.
The wire-feeding rate 15g/min of thermal spraying generating means, argon flow amount 150L/min, nitrogen flow 12L/min, electric current
350A, voltage 65V, sprays away from 120mm.Cooling gas is compressed argon, speed 300m/s.
Intermediate powder size is made between 150-300 microns.
800 DEG C/s of electromagnetic induction coil firing rate, forms fusing flow diameter 100-150 microns, and fusing stream passes through speed
0.2-2.0m/s, rotary speed 50-2000r/s, disk diameter 30-500mm.The vacuum of chamber is 10-4。
The oxygen content that powder is made is less than 0.001% (percentage by weight), and size is in 20-60 microns, and sphericity is high.
Embodiment 2：
Titanium is prepared, device is as shown in Figure 1.Raw material is the diameter 4.0mm metal titanium wires of as cast condition.
The wire-feeding rate 12g/min of thermal spraying generating means, argon flow amount 180L/min, nitrogen flow 14L/min, electric current
380A, voltage 60V, sprays away from 140mm.Cooling gas is compressed argon, speed 450m/s.
Intermediate powder size is made between 200-300 microns.
800 DEG C/s of electromagnetic induction coil firing rate, forms fusing flow diameter 120-200 microns, and fusing stream passes through speed
0.4-1.8m/s, rotary speed 250-800r/s, disk diameter 80-200mm.Chamber vacuum degree is 10-4。
The oxygen content that powder is made is less than 0.001% (percentage by weight), and size is in 20-80 microns, and sphericity is high.
Embodiment 3：
Metallic nickel is prepared, device is as shown in Figure 1.Raw material is the diameter 3.0mm metal nickel wires of as cast condition.
The wire-feeding rate 10g/min of thermal spraying generating means, argon flow amount 150L/min, nitrogen flow 12L/min, electric current
4000A, voltage 70V, sprays away from 180mm.Cooling gas is compressed argon, speed 380m/s.
Intermediate powder size is made between 200-350 microns.
800 DEG C/s of electromagnetic induction coil firing rate, forms fusing flow diameter 200-300 microns, and fusing stream passes through speed
0.2-0.8m/s, rotary speed 150-600r/s, disk diameter 80-150mm.Chamber vacuum degree is 10-4。
The oxygen content that powder is made is less than 0.001% (percentage by weight), and size is in 30-100 microns, and sphericity is high.
By above-described embodiment, two benches provided by the invention prepare high cleanliness metal dust method, pass through
It is prepared by the intermediate powder that one stage realized high-efficient simple；Then by electromagnetic induction heating, rotary-atomizing, condition of high vacuum degree side
Method realizes the preparation of high cleanliness metal dust, and size uniformity, circularity are high.
Embodiment described above only expresses the embodiment of the present invention, but can not be therefore understands that for the present invention
The limitation of the scope of the claims.Any variation that those skilled in the art is done under the enlightenment of present inventive concept to the present invention falls
Within the scope of the present invention.
Claims (2)
1. metal powder preparation method and device, it is characterised in that：By continuous conveying raw material thread rod 2, occurred using thermal spraying
Device 3 forms thermal spray metal molten drop 9, and wire feed rate and thermal spraying generator parameter are by flow of the compressed gas gauge 4, compressed gas
5, and control system 1 controls；In its front using high-speed gas beam 8 caused by reverse high pressure gas generator 7 to thermal jet
Matel coated molten drop is cooled down and is atomized, and its speed and flow are controlled by cooling gas flowmeter 6；By oxygen sensor 11,
The parameters such as oxygen content, temperature and pressure in 13 real-time detection chambers of pressure sensor 12 and temperature sensor, and it is transferred to control
System 1 processed, control system provide the operational factor fed back and adjust key componentses in real time according to internal database；In chamber
Individual metal bath and gas vent 10 are arranged at bottom, enter filter 14 with by outlet with the metal drop of compressed gas
Between powder collect device 15, remaining part enters collector 16；Filtering sieve wherein in filter and intermediate powder collector
Size can be adjustable according to target size；Intermediate powder enters vacuum chamber and pressue device 17, under the heating of magnet coil 18
Fusing, and form powder melt drip 19；Drop stream falls under gravity into rotating disk 20, and then is thrown out of and passes through
Refinement and cooling again, metal dust 23 is formed, and collected by recovery protection device 21 and powder catcher 22.
2. metal powder preparation method according to claim 1 and device, it is characterised in that：Vacuum chamber and pressue device
Including one-level raw material cabin 171, one-level charge door 172, secondary raw materials storehouse 173, inert gas pressurizer 174, inert gas entrance
175, three-level raw material cabin 176, feed opening 177, and vacuum extractor 178.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554320.5A CN107570719A (en) | 2017-07-10 | 2017-07-10 | Metal powder preparation method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554320.5A CN107570719A (en) | 2017-07-10 | 2017-07-10 | Metal powder preparation method and device |
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| Publication Number | Publication Date |
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| CN107570719A true CN107570719A (en) | 2018-01-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946108A (en) * | 2019-03-19 | 2019-06-28 | 首钢集团有限公司 | A kind of molten drop slag specimen collection device |
| CN110871274A (en) * | 2019-12-05 | 2020-03-10 | 菏泽学院 | Titanium alloy powder processing equipment and preparation process |
| CN111142600A (en) * | 2020-01-16 | 2020-05-12 | 南京工业大学 | Powder collection and cooling automatic control system used in vacuum gas atomization powder preparation process |
| CN111266585A (en) * | 2020-03-02 | 2020-06-12 | 合肥尚德新材料有限公司 | Method for preparing liquid-phase-immiscible metal composite material |
| CN112658272A (en) * | 2020-12-16 | 2021-04-16 | 杭州电子科技大学 | High-cooling-gradient plasma arc-gas atomization composite powder making device and method |
| CN114245762A (en) * | 2019-08-15 | 2022-03-25 | Ald真空技术有限公司 | Method and device for separating conductive liquid |
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| CN104588674A (en) * | 2015-01-28 | 2015-05-06 | 大连理工大学 | High efficiency superfine spherical metal powder preparation method and device |
| CN106862578A (en) * | 2017-02-13 | 2017-06-20 | 连云港倍特超微粉有限公司 | It is a kind of to combine the apparatus and method that atomization type prepares spherical metal alloy powder |
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Patent Citations (5)
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| JPH02290907A (en) * | 1989-04-28 | 1990-11-30 | Showa Denko Kk | Method and apparatus for manufacturing solder fine powder |
| US6398125B1 (en) * | 2001-02-10 | 2002-06-04 | Nanotek Instruments, Inc. | Process and apparatus for the production of nanometer-sized powders |
| CN103752838A (en) * | 2014-01-23 | 2014-04-30 | 同济大学 | Device for preparing ultra-fine metal powder in multi-stage atomization technique and use method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946108A (en) * | 2019-03-19 | 2019-06-28 | 首钢集团有限公司 | A kind of molten drop slag specimen collection device |
| CN114245762A (en) * | 2019-08-15 | 2022-03-25 | Ald真空技术有限公司 | Method and device for separating conductive liquid |
| US11919089B2 (en) | 2019-08-15 | 2024-03-05 | Ald Vacuum Technologies Gmbh | Method and device for breaking up an electrically conductive liquid |
| CN110871274A (en) * | 2019-12-05 | 2020-03-10 | 菏泽学院 | Titanium alloy powder processing equipment and preparation process |
| CN111142600A (en) * | 2020-01-16 | 2020-05-12 | 南京工业大学 | Powder collection and cooling automatic control system used in vacuum gas atomization powder preparation process |
| CN111142600B (en) * | 2020-01-16 | 2021-05-28 | 南京工业大学 | Powder collection and cooling automatic control system used in vacuum gas atomization powder preparation process |
| CN111266585A (en) * | 2020-03-02 | 2020-06-12 | 合肥尚德新材料有限公司 | Method for preparing liquid-phase-immiscible metal composite material |
| CN112658272A (en) * | 2020-12-16 | 2021-04-16 | 杭州电子科技大学 | High-cooling-gradient plasma arc-gas atomization composite powder making device and method |
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Application publication date: 20180112 |