CN108608002A - A kind of device and method using high energy and high speed plasma flame flow nodularization powder - Google Patents
A kind of device and method using high energy and high speed plasma flame flow nodularization powder Download PDFInfo
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- CN108608002A CN108608002A CN201810454641.2A CN201810454641A CN108608002A CN 108608002 A CN108608002 A CN 108608002A CN 201810454641 A CN201810454641 A CN 201810454641A CN 108608002 A CN108608002 A CN 108608002A
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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
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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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
Abstract
The invention discloses a kind of devices using high energy and high speed plasma flame flow nodularization powder, including：Powder kettle processed；Supersonic speed plasmatorch, front end are inserted into powder kettle processed；Nozzle is mounted on the front end of supersonic speed plasmatorch, and nozzle upper edge is axially arranged with air admission hole, is radially equipped with powder feeding hole, and powder feeding hole is connected to air admission hole；Powder feeder is equipped with powder feeding connector, and is connected to the powder feeding hole of nozzle by powder feeding connector；Powder basin is contained, is arranged in the bottom of powder kettle processed, for collecting the spherical powder generated in powder kettle processed.The present invention also provides a kind of method using above-mentioned apparatus nodularization powder, ratio, flow, the electric current of working gas etc. in preparation process are controlled, ensures the work of ion flame stream nodularization powder preparation system steady and continuous.Device and method provided by the invention using plasma flame flow nodularization powder, the metal powder purity of acquisition is high, hollow ball is less, without satellite ball and sphericity height, and efficiency is higher, and nozzle is not glued in long time continuous working.
Description
Technical field
The invention belongs to the preparation method technical fields of spherical powder, more particularly to a kind of to utilize high energy and high speed flame passes
Flow the device and method of nodularization powder.
Background technology
With the development of science and technology, the application of metal 3D printing technique is more and more extensive, some large-scale titanium alloy abnormity knots
Component such as aircraft keel can only utilize 3D printing technique to manufacture.High-purity small particle (15~53 μm) sized spherical titanium powder is 3D printing
Raw material, powder property have great influence to product quality.In addition the performance of titanium powder is also to determine titanium or titanium alloy powder
The key factor of metallurgical product quality.It is to solve the effective way of marine settings corrosion-resistant to prepare titanium coating using the method for thermal spraying
Diameter, but currently without the dedicated cheap spherical titanium powder of thermal spraying.
The method that the 1950s, American invention HDH method produced titanium valve, in the 1970s, rotation electrode
Centrifugal atomizing prepares titanium valve technology and reaches its maturity.Preparing spherical titanium and the main method of Titanium Powder at present has：Gas atomization (GA
Method), plasma rotating electrode process (PREP methods) and radio frequency plasma nodularization method (RFP methods).
(1) gas atomization is divided into inert gas atomizer method and ultrasonic atomizatio method.
1. it is that the method for mainstream, used raw material are the most both at home and abroad at present that inert gas atomizer method, which prepares sized spherical titanium powder,
The titanium or titanium alloy bar of certain specification.Fuel rod is melted in crucible, by the nozzle of crucible bottom by the melt of generation
With high-speed gas injection, it is in spray form to make molten metal, and condensation forms sized spherical titanium powder.The advanced high temperature knot in Beijing Research Inst. of Aeronautic Material
Structure material national defence key lab has introduced cold wall crucible vacuum induction melting argon gas atomising device from PSI companies of Britain, mainly
Preparation and research for inert gas atomizer titanium valve.The characteristics of powder prepared using this method is powder diameter distribution
Wider, fine powder recovery rate is higher, and the composition tolerances of powdered ingredients and master alloy bar are smaller, and impurity element can obtain very well
Control.But since aeroponics are during preparing titanium valve, the cooling speed of the different sized particles of cooled droplet formation
Degree is different, causes sphericity poor, planet particle is more；When on the other hand due to gas breaking metal liquid stream inevitably
Hollow powders are generated, these hollow powders remain in follow-up powder metallurgy process, can cause the internal flaw of material.In addition,
The plasticity index of the block materials obtained after hot isostatic pressing using titanium valve made of this method is relatively low, and wanting for forging is not achieved
It asks.
Another gas-atomized powder method that 2. ultrasonic atomizatio powder, which is developed recently, to get up, there are mainly two types of the technologies：
One kind can convert high-frequency electromagnetic oscillation to liquid machine vibration, and droplet is made to be crushed mist formation；Another kind can flow through super
Thin drop layer is formed in radiating surface when sound amplitude transformer, thin drop layer evokes capillary wave under the action of ultrasonic vibration, when
When the amplitude of vibration plane reaches certain peak value, droplet splashes to form mist from wave crest, is made using ultrasonic atomizatio method
The grain size of spherical powder be inversely proportional with supersonic frequency, the working frequency of ultrasound atomization system is higher, obtained spherical powder
Granularity is smaller.Zhang Shuguang of Beijing Non-Fervoous Metal Inst. etc., Active Ultrasonics companies of Switzerland and German Research people
Member is successively prepared for powder any surface finish using the technology, and 10~45 μm of grain size, oxygen content is low, and satellite particle is few, good sphericity
Titanium powder, but this technology still can not solve the problems, such as hollow powders.
(2) plasma rotating electrode process
Consutrode is made in metal or alloy, electrode end surface is molten into liquid by electric arc heated, passes through electrode high speed
Liquid is dished out and is ground into fine drop by the centrifugal force of rotation, and the method for being finally condensed into powder is exactly rotary electrode method.This
Kind milling method was succeeded in developing in 1974 by U.S.'s core metal company first, can be according to the size and electrode of arc-plasma current
The grain size of rotation speed regulating and controlling powder.China Beijing iron and steel research institute and space material technical study took the lead in having introduced Russia in 1998
The plasma rotating electrode equipment of Ross, and carried out the preparation research work of sized spherical titanium powder.Currently, domestic independent research goes out
It can be used for preparing the plasma rotating electrode equipment of sized spherical titanium powder.Wherein, the DXD-50 types etc. that Zhengzhou Research Institute of Mechanical Engineering manufactures
The advantages of ion rotary-atomizing powder manufacturing apparatus is examined by producing, and operation of putting into production, the plasma rotating electrode process
It is prepared powder without hollow-core construction, it is preferable and without the titanium alloy powder of planet particle that sphericity can be prepared.But disadvantage
It is that the granularity of titanium valve focuses mostly at 106~246 μm, the recovery rate less than 106 μm of sized spherical titanium powder is relatively low.It can not prepare less than 45
μm sized spherical titanium powder.
(3) radio frequency plasma nodularization method
Radio frequency plasma nodularization method is to carry out sensing heating, production to various gases using the induction effect of radio frequency electromagnetic field
Raw radio frequency plasma melts aspherical powder using the plasma of high temperature, the powder particle of melting under surface tension effects,
Under high temperature gradient, rapid condensation forms the very high droplet of sphericity, and obtains spherical powder.Canadian TEKNA
The radio frequency plasma powder handling system of company's exploitation is currently in rank first, the said firm utilized radio frequency etc. from
Sub- technology realizes the spheroidising of the metal powders such as Ti, W, Mo, Ta, Ni, Cu.University of Science ＆ Technology, Beijing is in national high-tech research
Under the support of development plan, domestic First water-cooled quartz radio frequency plasma powder handling system, southwest science and technology are had developed
Loyal great waves of Gu of university etc. utilized radio frequency plasma nodularization method in 2009, by the amount of feeding, the powder processed that control aspherical titanium valve
Mode, cooling velocity etc. have prepared the preferable titanium valve of sphericity.It is that sphericity can be improved that the technology, which prepares titanium valve, preferably
Improve the mobility of powder；The slit inside particle can be eliminated, powder shatter value is improved；Particle surface pattern can suitably be changed,
Improve the purity of powder.But the disadvantage is that the Oxygen potential highest of powder only has 85%, and need by repeatedly screening, production efficiency compared with
Low, cost is higher, during preparing sized spherical titanium powder, due to factors such as melting collision, vaporization recrystallizations, can lead to a fixed number
The bulky grain of amount is formed, therefore cannot be excessive by the aspherical powder particle of nodularization.
Gas atomization, which prepares titanium valve, in summary can not solve the problems, such as hollow powder；Titanium prepared by plasma rotating electrode process
Powder diameter is excessive, can not prepare titanium powder of the grain size less than 53 μm for being most appropriate to 3D printing and thermal spraying；Radio frequency plasma
Nodularization method prepares the less efficient of titanium valve, and of high cost, powder price is higher.
To solve the deficiency of three of the above method, present invention proposition is under vacuum with high energy and high speed plasma flame flow
Heat source heats irregular powder raw material, forms powder molten drop, and utilize the atomization of high speed plasma flame flow, nodularization powder molten drop, gold
Metal particles obtain 15~53 μm of small particle spherical metal powders needed using sub-sieve after flight cooled and solidified.It can use
In 3D printing, powder metallurgy, thermal spraying etc..
Invention content
The object of the present invention is to provide a kind of devices using high energy and high speed plasma flame flow nodularization powder, use Supersonic
Fast plasma square prepares spherical powder using irregular powder raw material, can obtain the few nodularization powder of small particle, hollow ball, and
Ensure long-time continuous stable work.
Another object of the present invention be overcome that prior art preparation spherical powder grain size is big, hollow ball is more, satellite ball is more and
The defect of sphericity difference, provide it is a kind of using high energy and high speed plasma flame flow can high efficiency obtain small particle, spherical shape, it is hollow compared with
Few nodularization powder method.
It is controlled during it is a still further object of the present invention to provide a kind of utilization high energy and high speed plasma flame flow nodularization powder
The method of raw material powder powder sending quantity processed can ensure that the proportion in product shared by spherical powder is higher.
Utilize the method for high energy and high speed plasma flame flow nodularization powder.
Technical solution provided by the invention is：
A kind of device using high energy and high speed plasma flame flow nodularization powder, which is characterized in that including：
Powder kettle processed；
Supersonic speed plasmatorch, front end are inserted into the powder kettle processed；
Nozzle is mounted on the front end of the supersonic speed plasmatorch, and the nozzle center is equipped with axial passage, radially
Equipped with powder feeding hole；
Powder feeder is equipped with powder feeding connector, and is connected to the powder feeding hole of the nozzle by the powder feeding connector；
Powder basin is contained, is arranged in the bottom of the powder kettle processed, for collecting the spherical powder generated in the powder kettle processed.
Preferably, the nozzle is internal powder conveying nozzle, and the powder feeding hole of the internal powder conveying nozzle is connected to axial passage, powder
Powder stock is mixed with the plasma flame flow formed in nozzle in the axial passage of nozzle interior.
Preferably, the nozzle is outer powder-feeding nozzle, and the axial passage outlet outside of the outer powder-feeding nozzle, which is equipped with, to be sent
Powder hole, powder raw material are mixed with the plasma flame flow formed in nozzle on the outside of the outlet of nozzle axial passage.
Preferably, the powder kettle inner wall processed installs cooling water pipe.
Preferably, the inner wall of the powder kettle processed be stainless steel, internal diameter be 600~1000mm, length be 4000~
5000mm。
Preferably, pumping slide valve is equipped between vacuum pump and powder kettle processed, for switching bleed-off passage；In powder kettle processed
Exhaust outlet is equipped with exhaust slide valve and filter, and exhaust slide valve is used to filter discharge for switching exhaust passage, pass filter
Gas.
A method of using high energy and high speed ion flame stream nodularization powder, include the following steps：
Step 1: the air pressure in powder kettle processed is evacuated to 1~10mba；
Step 2: inert working gas to be axially passed through to the nozzle of plasmatorch, using high frequency to plasmatorch striking, shape
At high temperature and high speed plasma flame flow；
Step 3: powder raw material is sent into the nozzle by radial powder feeding hole；
Step 4: high temperature and high speed plasma flame flow heating powder raw material, forms molten drop, and further it is atomized, described in nodularization
Molten drop；
Step 5: the molten drop ejected flies in powder kettle processed, natural cooling, solidification are dropped to and are contained in powder basin.
Preferably, the main gas of the inert working gas is argon gas, and auxiliary gas is helium, the flow-rate ratio of helium and argon gas
It is 0~50%.
Preferably, the powder sending quantity for controlling powder raw material is：
Wherein, U is the operating voltage of plasma square, and d is the maximum particle diameter of powder raw material；I is electric current, QArFor working gas
The flow of main gas argon gas, auxiliary gas QHeFlow, f be work schedule powder kettle in pressure.
Preferably, the powder raw material grain size is 18~150 μm.
Preferably, the powder raw material is titanium powder.
Preferably, in the step 5, in pulverizing process when air pressure is more than 0.5MPa in powder kettle processed, exhaust is opened
Valve is more than 15 μm of spherical powders using filter collection cut size.
Preferably, it is 1mba~0.5MPa to control powder gas reactor pressure processed.
Preferably, it is 100~200 DEG C to control powder temperature in the kettle processed.
Preferably, the plasmatorch is high energy supersonic speed plasmatorch.
Preferably, there is a partition every 1000mm among the Sheng powder basin, fall for collecting different jet lengths
Powder.
The beneficial effects of the invention are as follows：
(1) device provided by the invention using high energy and high speed plasma flame flow nodularization powder, using supersonic speed plasma
Square prepares spherical powder using irregular powder raw material, when can obtain the few spherical powder of small particle, hollow ball, and ensure long
Between continuous-stable work, not glue nozzle.
(2) it is spherical to can get small particle for the method provided by the invention using high energy and high speed plasma flame flow nodularization powder
Powder, and the obtained solid rate of spherical powder is high, satellite ball is few.
(3) method provided by the invention using high energy and high speed plasma flame flow nodularization powder, milling efficiency are high.
(4) method of control raw material powder powder sending quantity provided by the invention, can join according to the work of powder preparation system
Number, adjusts powder sending quantity, and the ratio further ensured in product shared by spherical powder is higher.
Description of the drawings
Fig. 1 is ion flame stream nodularization powder preparation system structural schematic diagram of the present invention.
Fig. 2 is the structural schematic diagram of internal powder conveying nozzle of the present invention.
Fig. 3 is the structural schematic diagram of outer powder-feeding nozzle of the present invention.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art with reference to specification text
Word can be implemented according to this.
As shown in Figure 1, the present invention provides a kind of method using high energy and high speed plasma flame flow nodularization powder, use
Preparation system include：Supersonic speed plasmatorch, powder kettle processed, vacuum pump, filter, powder feeder, power supply, control assembly, Sheng Fen
Basin, plasmatorch refrigeration system, powder kettle refrigeration system processed, temperature and pressure monitoring system.
For supersonic speed plasmatorch for generating high energy and high speed plasma arc, the front end of supersonic speed plasmatorch is equipped with spray
Mouth.Tungsten electrode connects the cathode of power supply inside plasmatorch, and nozzle connects the anode of power supply, and working gas is sent into plasma through controlling assembly
Torch.Plasmatorch refrigeration machine, water power adapter, continuous water pipe, water power cable constitute plasmatorch refrigeration system, are used for plasma
Torch provides recirculated cooling water, is cooled down to transferred-arc plasma torch gun body.
The plasmatorch front gun body outer circle is cylinder, can be inserted in by attachment device on the door of powder kettle processed, pipette tips
Position is in powder kettle processed, and axially towards interior, gun breech portion is outside powder kettle processed, the pipelines such as connection water, electricity, gas.Described installation etc. from
The attachment device of sub- torch has powder feeding connector, the powder feeding connector to be connected to the powder feeding hole of the nozzle in radially installed.Shape is not
The powder raw material of rule is sent through powder feeding hose, powder feeding connector to the powder feeding hole of nozzle by powder feeder, and is sprayed to nozzle.
Powder kettle processed provides confined space for entire pulverizing process, and inside is negative pressure when vacuumizing, when normal work inside by
Negative pressure is increased to positive pressure.On powder kettle processed equipped with positive pressure table, vacuum table, thermometer constitute monitoring system, for monitor air pressure inside,
Temperature.Powder kettle inner wall processed installs cooling water pipe, and powder kettle refrigeration machine processed provides circulating cooling for the cooling water pipe into powder kettle processed
Water, powder kettle refrigeration machine processed, cooling water pipe, connection water pipe constitute powder kettle cooling system processed.In one embodiment, powder kettle horizontal pendulum processed
It puts, in another embodiment, powder kettle vertical display processed.
Vacuum pump is equipped with pumping slide valve, for opening for that will be vacuumized in powder kettle processed between vacuum pump and powder kettle processed
Close bleed-off passage.It is equipped with exhaust slide valve and filter in the exhaust outlet of powder kettle processed, exhaust slide valve is used to switch exhaust passage,
Filter is used to filter the gas of discharge.
It is equipped in the bottom of powder kettle processed and contains powder basin, the spherical powder generated for collecting injection.When level puts powder kettle processed,
It contains and is set there are one partition per 1000mm among powder basin, the powder fallen for collecting different jet lengths.It is equipped on the downside of powder kettle processed
It unloads powder groove and unloads powder valve, for unloading powder.
Power supply is used to power for entire spherical metal powder preparation system, and control assembly is for controlling entire pulverized coal preparation system
Water, electricity, gas, and real-time monitoring system operating status.
Method provided by the invention using high energy and high speed plasma flame flow nodularization powder includes the following steps：
Step 1: opening vacuum pump, the air pressure in powder kettle processed is evacuated to 1~10mba.
As a further preference, for stainless steel, powder gas reactor pressure control processed exists the powder kettle inner wall processed used
1mba~0.5MPa.The powder kettle inner wall processed installs copper cooling water pipe, ensures that powder temperature in the kettle processed is in 100~200 DEG C.
Step 2: tungsten electrode inside plasmatorch to be connect to the cathode of power supply, nozzle connects the anode of power supply；Using argon gas as work gas
Body generates untransferable arc using high frequency to plasmatorch striking, forms high temperature and high speed plasma flame flow；The plasmatorch
Using supersonic speed plasmatorch.
Step 3: powder raw material is sent into nozzle front by radial powder feeding hole.
It is argon gas to generate main gas in the inert working gas of plasma flame flow, and auxiliary gas is hydrogen, nitrogen or helium
It is one or more.When powder raw material is titanium or titanium alloy, use the main gas of inert working gas for argon gas, auxiliary gas is helium
The flow-ratio control of gas, helium and argon gas is 0~50%.
Powder raw material size controlling is at 18~150 μm.Metal powder can be used in powder raw material, including：Titanium or titanium alloy powder
End, aluminium and Al alloy powder, tungsten and tungsten alloy powder, molybdenum and molybdenum alloy powder, copper and copper alloy powder, tantalum and tantalum alloy, nickel
And nickel-base alloy, ferrous alloy etc..
Ceramic powders can be used in powder raw material, including：Titanium oxide, zirconium oxide, yttrium oxide, chromium oxide, aluminium oxide etc..
Metal-ceramic composite powder end can be used in powder raw material, including：Cobalt tungsten carbide, chromium carbide etc..
Two kinds of internal powder conveying mode and outer automatic powder feeding system may be selected in automatic powder feeding system.
As shown in Fig. 2, in one embodiment, internal powder conveying mode is selected, using internal powder conveying nozzle 110, internal powder conveying nozzle 110
Equipped with axial passage 111, the input end of axial passage 111 is connected to the plenum duct for being sent into inert working gas, axial passage
111 along plasma flame flow circulating direction include the different first segment 113 of taper, second segment 114, third section 115 and the 4th successively
Section 116.First segment 113 and second segment 114 are inducer, and the taper α of first segment 113 is 15~20 degree, the cone of second segment 114
Spending β isSuch taper design can further increase the speed of jet stream, to improve the productivity of fine powder.Third section
115 and the 4th section 116 be outlet section, the taper γ of third section 115 is 1-5 degree, and the 4th section 116 of taper theta is 5~15 degree.This
Sample design benefit be：The possibility that nozzle bore glues mouth can be further decreased, spray gun stability is provided, spray gun is allow to grow
Time Continuous works.Preferred α is 20 degree, and β is 10 degree, and θ is 8 degree, and γ is 2 degree.Internal powder conveying nozzle 110 is in corresponding axial passage
Two powder feeding holes 112, the powder feeding hole 112 and the 4th of axial passage 111 is arranged in 111 the 4th section of 116 upper edge radial symmetric
Section 116 is connected to.When internal powder conveying nozzle 110 being used to be sent into powder raw material, axial passage of the powder raw material in interior powder-feeding nozzle 110
Enter plasma flame flow in 111.
As shown in figure 3, in another embodiment, selecting outer automatic powder feeding system, using outer powder-feeding nozzle 120, outer powder-feeding nozzle
Axial passage 121 is equipped in 120, axial passage 121 includes the different first segment of taper successively along plasma flame flow circulating direction
124, second segment 125 and third section 126, first segment 124 and second segment 125 are inducer, the taper α of first segment 124 is 15~
20 degree, the taper β of second segment 125 isSuch taper design can further increase the speed of jet stream, thin to improve
The productivity of powder.Third section 126 is outlet section, and taper γ is 1-5 degree.Outer powder-feeding nozzle 120 is equipped in 126 front end of third section
Cylindrical cavity 123；Third section 126 is connected to cylindrical cavity 123, and the internal diameter of 126 outlet end of third section is less than cylindrical empty
The internal diameter of chamber 123, Correspondent cy linder shape cavity 123 is partially radially symmetrical arranged two powder feeding holes 122, institute on the outside of the nozzle
It states powder feeding hole 122 to be connected to cylindrical cavity 123, powder raw material enters at the cylindrical cavity 123 in 120 outside of outer powder-feeding nozzle
The plasma flame flow.That is larger cylindrical empty of the powder raw material with plasma flame flow on the outside of the outlet of the axial passage 121
It is mixed in chamber 123.The benefit designed in this way be：The possibility that nozzle bore glues mouth can be further decreased, it is steady to provide spray gun
It is qualitative, make spray gun can be with long time continuous working.
Step 4: high temperature and high speed plasma flame flow heating powder raw material, forms molten drop, and further atomization, nodularization powder
Molten drop；Simultaneously in time adjust plasma arc relevant parameter, including the ratio of inert working gas, flow, electric current etc., ensure from
Sub- flame stream nodularization powder preparation system steady and continuous work.
In one embodiment, powder sending quantity 100g/min.
In an another embodiment, rule of thumb, the powder sending quantity of powder is controlled, stable work in work is made, ensure to obtain
Proportion in the metal powder obtained shared by spherical powder is higher；Wherein, the powder sending quantity for controlling powder raw material is：
Wherein, U is the operating voltage of plasmatorch, unit：V；D is the maximum particle diameter of powder raw material, unit：μm；I is electricity
Stream, unit：A；QArFor the flow of the main gas argon gas of working gas, unit：m3/h；Assist gas QHeFlow, unit：m3/h；F is
Pressure in work schedule powder kettle, unit：MPa；Q is powder sending quantity, unit：g/min.
Step 5: the powder molten drop ejected flies in powder kettle processed, natural cooling, solidification are dropped to and are contained in powder basin.System
During powder when air pressure is more than 0.5MPa in powder kettle processed, drain tap is opened, exhaust outlet is connected with filter, utilizes filter
Collection cut size is more than 15 μm of metal powders.
After powder processed, gas reactor is discharged, after normal pressure is down in air pressure, opens powder kettle processed, takes out and contain powder basin.Sub-sieve contains powder
Powder in basin obtains different-grain diameter powder.
Embodiment one
Plasmatorch uses high energy supersonic speed plasmatorch (supersonic plasma spray gun), and powder raw material is using hydrogenation legal system
The irregular shape titanium powder taken, using internal powder conveying (nozzle) mode powder feeding, the main gas of inert working gas is argon gas, assists gas
For helium, specific works parameter is as follows：
Powder raw material grain size：38~58 μm,
Argon flow amount：6m3/ h,
Helium gas flow：2m3/ h,
Electric current：800A,
Operating voltage：125V,
Minimum negative pressure in powder kettle processed：10mba,
Work schedule powder kettle highest positive pressure：0.15MPa；
Control powder raw material powder sending quantity be：
The titanium spherical powder obtained in embodiment one, spherical powder proportion reach 50% or more；Spherical powder is basic
Solid, satellite ball is seldom；Milling efficiency is high, can reach 6kg/h；Pulverized coal preparation system good operating stability, the continuous work of long-time
Make not glue nozzle.
Embodiment two
Plasmatorch uses high energy supersonic speed plasmatorch (spray gun), powder raw material to use the irregular shape that hydrogenization method is produced
Shape titanium powder, using outer powder feeding (nozzle) mode powder feeding, the main gas of inert working gas is argon gas, and auxiliary gas is helium, specifically
Running parameter is as follows：
Powder raw material grain size：38~58 μm,
Argon flow amount：5m3/ h,
Helium gas flow：2m3/ h,
Electric current：800A,
Operating voltage：120V,
Minimum negative pressure in powder kettle processed：10mba,
Work schedule powder kettle highest positive pressure：0.15MPa；
Control powder raw material powder sending quantity be：
The titanium spherical powder obtained in embodiment two, spherical powder proportion reach 40% or more；Spherical powder is basic
Solid, satellite ball is seldom；Milling efficiency is high, can reach 6kg/h；Pulverized coal preparation system good operating stability, the continuous work of long-time
Make not glue nozzle.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of device using high energy and high speed plasma flame flow nodularization powder, which is characterized in that including：
Powder kettle processed；
Supersonic speed plasmatorch, front end are inserted into the powder kettle processed；
Nozzle, is mounted on the front end of the supersonic speed plasmatorch, and the nozzle center is equipped with axial passage, is radially equipped with
Powder feeding hole；
Powder feeder is equipped with powder feeding connector, and is connected to the powder feeding hole of the nozzle by the powder feeding connector；
Powder basin is contained, is arranged in the bottom of the powder kettle processed, for collecting the spherical powder generated in the powder kettle processed.
2. the device according to claim 1 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that described
Nozzle is internal powder conveying nozzle, and the powder feeding hole of the internal powder conveying nozzle is connected to axial passage, is formed in powder raw material and nozzle
Plasma flame flow mixes in the axial passage of nozzle interior.
3. the device according to claim 1 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that described
Nozzle is outer powder-feeding nozzle, and the axial passage outlet outside of the outer powder-feeding nozzle is equipped with powder feeding hole, in powder raw material and nozzle
The plasma flame flow of formation mixes on the outside of the outlet of nozzle axial passage.
4. the device according to claim 2 or 3 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that
The inner wall of the powder kettle processed is stainless steel, and the internal diameter of the powder kettle processed is 600~1000mm, and length is 4000~5000mm.
5. the device according to claim 4 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that described
Powder kettle inner wall processed installs cooling water pipe.
6. a kind of method using high energy and high speed plasma flame flow nodularization powder utilizes height using as described in Claims 1 to 5
The device of energy high speed plasma flame flow nodularization powder, which is characterized in that include the following steps：
Step 1: the air pressure in powder kettle processed is evacuated to 1~10mba；
Step 2: inert working gas to be axially passed through to the nozzle of plasmatorch, using high frequency to plasmatorch striking, formed high
Warm high speed plasma flame flow；
Step 3: powder raw material is sent into the nozzle by radial powder feeding hole；
Step 4: high temperature and high speed plasma flame flow heating powder raw material, forms molten drop, and further it is atomized, molten drop described in nodularization；
Step 5: the molten drop ejected flies in powder kettle processed, natural cooling, solidification are dropped to and are contained in powder basin.
7. the method according to claim 6 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that described
The main gas of inert working gas is argon gas, and auxiliary gas is helium, and the flow-rate ratio of helium and argon gas is 0~50%.
8. the method according to claim 7 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that control
The powder sending quantity of powder raw material is：
Wherein, U is the operating voltage of plasma square, and d is the maximum particle diameter of powder raw material；I is electric current, QArFor the main gas of working gas
The flow of argon gas, auxiliary gas QHeFlow, f be work schedule powder kettle in pressure.
9. the method according to claim 7 or 8 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that
In the step 5, in pulverizing process when air pressure is more than 0.5MPa in powder kettle processed, drain tap is opened, is received using filter
Collect grain size and is more than 15 μm of spherical powders.
10. the method according to claim 9 using high energy and high speed plasma flame flow nodularization powder, which is characterized in that control
System powder temperature in the kettle processed is 100~200 DEG C.
Priority Applications (1)
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| CN114888281A (en) * | 2022-06-08 | 2022-08-12 | 华材(山东)新材料有限公司 | Production method of spherical hafnium powder |
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