CN110125425A - A kind of method that electrode induction aerosolization continuous flow prepares globular metallic powder - Google Patents
A kind of method that electrode induction aerosolization continuous flow prepares globular metallic powder Download PDFInfo
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- CN110125425A CN110125425A CN201910557999.2A CN201910557999A CN110125425A CN 110125425 A CN110125425 A CN 110125425A CN 201910557999 A CN201910557999 A CN 201910557999A CN 110125425 A CN110125425 A CN 110125425A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0836—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with electric or magnetic field or induction
Abstract
The present invention discloses a kind of method that electrode induction aerosolization continuous flow prepares globular metallic powder, it is related to metal powder preparation technical field, the problem of metal liquid stream is discontinuous, and the following ratio of 270 mesh is in reduced levels in gas atomization preparation process is incuded based on existing electrode and is proposed.The present invention is the following steps are included: (1) pretreatment of raw material；(2) setting of load coil；(3) setting of atomizer；(4) electrode induction melting；(5) it is atomized.The beneficial effects of the present invention are: the present invention passes through round metal bars, load coil, atomizer shape and structure during adjusting electrode induction aerosolization, metal liquid after making fusing is under the action of self gravity and nozzle suction power, continuous metal liquid stream is formed, diameter is 53-78% in 270 mesh globular metallic powder yield below.
Description
Technical field
The present invention relates to metal powder preparation technical fields, and in particular to a kind of electrode induction aerosolization continuous flow preparation
The method of globular metallic powder.
Background technique
Electrode induction gas atomization is generally used for manufacture active metal powder, such as titanium or titanium alloy, can also manufacture other
Metal material, such as Ni-based, iron-based, cobalt-based material.In the technical process, metal molten and atomization process carry out simultaneously,
That is fusing-drippage-spray patterns.
Electrode induction gas atomization is by intermetallic composite coating into pole, and is installed on the feed device that about one is advanced, right
Whole device is vacuumized and is filled with inert gas, and pole enters cone below with certain rotation speed and decrease speed
Shape induction coil, pole tip is acted on by induction heating in tape winding and gradually melts to form melt liquid stream, in gravity
Under the action of melt liquid stream flow directly into atomizer below tape winding, high pressure argon gas enters atomizer through gas path pipe, in gas
With metal liquid stream reciprocation occurs for body outlet lower section, acts on by high pressure gas liquid stream being broken into droplet, drop is through cold
But it is solidified as globular metallic powder afterwards.
For current this method in preparing titanium or titanium alloy powder process, metal liquid stream is drippage state, discontinuously, single liquid
Drip larger, high pressure gas is crushed insufficient, causes the following ratio of 270 mesh to be in reduced levels, is usually no more than 35%, and powder
Pattern, apparent density, mobility etc. are bad, and unit of the product time yield is not high, cause true production cost higher, product quality
It is limited.
Summary of the invention
Present invention solves the technical problem that being in existing electrode induction gas atomization preparation process that metal liquid stream does not connect
Continuous, the following ratio of 270 mesh is in reduced levels.
The present invention adopts the following technical solutions solves above-mentioned technical problem:
The present invention provides a kind of method that electrode induction aerosolization continuous flow prepares globular metallic powder, including following step
It is rapid:
(1) pretreatment of raw material: conical tip, the pole are processed into one end of round metal bars by preparation round metal bars
Diameter be 15-150mm, the angle a at conical shaft section tip is 30-75 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus and round platform axis of rotary table it
Between angle be 10-75 degree, the central diameter of load coil most great circle is 1.2-1.7 times of diameter of the rod, load coil
The central diameter of most ringlet is 0.1-1.5 times of diameter of the rod, and the number of turns of the induction coil is 2-7 layers；The load coil
Heating power supply output power be 20-130KW, output frequency 20-310KHz；
(3) setting of atomizer: the atomizer includes in the underface of load coil, the atomizer
Broken air flow chamber, being crushed is perforative nozzle bore in the middle part of air flow chamber, and the broken air flow chamber is equipped with broken air flow inlet；Institute
It states broken air flow chamber and is equipped with broken air stream outlet, by being crushed gas direction that air stream outlet sprays towards nozzle bore, air-flow shape
At inverted triangle taper；The nozzle bore is in truncated cone-shaped or cylinder, when nozzle bore is in truncated cone-shaped, the nozzle bore
For diameter in up-small and down-big, the diameter of the nozzle bore top surface is 10-26mm, and the diameter of the nozzle bore bottom surface is 10-
35mm, a height of 23-75mm in the hole of the nozzle bore, the admission pressure at the broken air flow inlet are 1.2-8.5MPa, institute
Stating the axial angle with nozzle bore diameter of axle direction of broken air stream outlet is in 5-87 degree；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and the revolving speed of the pole is 0.5-
2.7r/min, the decrease speed of pole are 30-150mm/min,
(5) it is atomized: the suction force collective effect that molten metal liquid is formed in its own gravity and nozzle in step (4)
Under, continuous flow is formed, by nozzle bore, is crushed through spraying inert gas from broken air flow outlet, obtains ball after cooling
Shape metal powder.
Preferably, the round metal bars are fusing point in 2500 DEG C of pure metal or metal alloy below.
Preferably, the metal is one of titanium, titanium alloy, cobalt-base alloys, nickel-base alloy, ferrous alloy.
Preferably, the diameter of the continuous flow of formation is 2.2-5.3mm.
Preferably, the gas being passed through at the broken air flow inlet is inert gas.
Preferably, the inert gas includes one of argon gas, nitrogen, argon gas or a variety of.
Preferably, the material of the load coil is copper tube.
Preferably, the broken air stream outlet is circular seam type or annular ring type structure.
Preferably, the atomizer further includes gas curtain air flow chamber, and gas curtain air flow chamber is equipped with gas curtain air stream outlet, gas curtain gas
Distance of the outflux apart from nozzle bore is greater than broken distance of the air stream outlet apart from nozzle bore, is sprayed by gas curtain air stream outlet
Gas direction it is parallel with nozzle bore direction or backwards to nozzle bore, gas curtain air stream outlet and broken air stream outlet are contour.
Preferably, the broken air flow chamber, gas curtain air flow chamber are annular chamber, and gas curtain air flow chamber is to be looped around broken air-flow
The separate chamber of chamber periphery, is crushed at the broken air flow inlet of air flow chamber and is equipped with first pipe, and first pipe is worn by gas curtain air flow chamber
The broken air flow inlet of connection is crossed, is equipped with second pipe at the gas curtain air flow inlet of gas curtain air flow chamber.
Preferably, the gas curtain air flow chamber is the independent annular chamber in broken air flow chamber, is crushed the broken gas of air flow chamber
It is equipped with first pipe at inflow entrance, is equipped with second pipe at the gas curtain air flow inlet of gas curtain air flow chamber.
The beneficial effects of the present invention are:
(1) present invention by adjust electrode incude aerosolization during round metal bars, load coil, atomizer
Shape and structure, make fusing after metal liquid under the action of self gravity and nozzle suction power, formed continuous metal liquid
Stream, diameter are 53-78% in 270 mesh globular metallic powder yield below；
(2) metal liquid forms continuous flow, avoids the waste of excessive gas, reduces production cost；
(3) it is passed through inert gas by being provided in gas curtain air flow chamber in the height close to the big drop of diameter, because straight
It is more prone to produce satellite powder at the big drop of diameter, gas is blown out by gas curtain air stream outlet, after forming gas curtain air-flow, can prevent temperature
High superfines forms bonding with the bulky grain powder that just atomization is formed, and with the air-flow gas curtain of certain flow rate, can stop to surpass
Fine powder close to nebulization region, particularly near meeting be blown away, and then be further reduced the generation of satellite powder.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pole in the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of atomizer in the embodiment of the present invention 1；
Fig. 3 is the structural schematic diagram of atomizer in the embodiment of the present invention 2；
Fig. 4 is the following powder scanning electron microscope (SEM) photograph of 270 mesh obtained in the embodiment of the present invention 3；
Fig. 5 is the following powder scanning electron microscope (SEM) photograph of 270 mesh obtained in the embodiment of the present invention 4；
In figure, 10- is crushed air flow chamber；11- is crushed air stream outlet；12- first pipe；20- gas curtain air flow chamber；21- gas curtain
Air stream outlet；22- second pipe；30- nozzle bore.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and embodiment.
Test material and reagent as used in the following examples etc., unless otherwise specified, commercially obtain.
In the examples where no specific technique or condition is specified, can according to the literature in the art described technology or
Condition is carried out according to product description.
Embodiment 1
The structure of atomizer:
Atomizer, pole, load coil are coaxially disposed, and Fig. 1 is the structural schematic diagram of pole, and atomizer exists
The underface of load coil, Fig. 2 is the structural schematic diagram of atomizer in the present embodiment, as shown in Fig. 2, atomizer packet
Broken air flow chamber 10 is included, being crushed in the middle part of air flow chamber 10 is perforative nozzle bore 30, is crushed air flow chamber 10 and is equipped with broken air-flow
Entrance 11；Broken air flow chamber 10 is equipped with broken air stream outlet 21, by being crushed gas direction that air stream outlet 21 sprays towards nozzle
Inner hole 30, air-flow form inverted triangle taper.
Embodiment 2
The structure of atomizer:
As shown in figure 3, atomizer further includes gas curtain air flow chamber 20, gas curtain air flow chamber 20 is equipped with gas curtain air stream outlet 21,
Distance of the gas curtain air stream outlet 21 apart from nozzle bore 30 is greater than broken distance of the air stream outlet 11 apart from nozzle bore 30, by gas
The gas direction that curtain air stream outlet 21 sprays is parallel with 30 direction of nozzle bore or backwards to nozzle bore 30, gas curtain air stream outlet 21
It is contour or difference in height is not too big with broken air stream outlet 11.
In the present embodiment, the broken air flow chamber 10, gas curtain air flow chamber 20 are annular chamber, and gas curtain air flow chamber 20 is circular
Separate chamber in broken 10 periphery of air flow chamber, the two top surface and bottom surface share, be equivalent to only with an annular slab by the two every
It opens, is crushed at the broken air flow inlet of air flow chamber 10 and is equipped with first pipe 12, first pipe 12 is passed through by gas curtain air flow chamber 20 to be connected
Broken air flow inlet is connect, is equipped with second pipe 22 at the gas curtain air flow inlet of gas curtain air flow chamber 20.This structure is the structure of suit,
Gas curtain air flow chamber 20 is centered around outside broken air flow chamber 10, in addition to this, is also possible to interval setting, when interval is arranged, the two
Bottom surface be connection status, top surface is to separate shape, and the two separated by two annular slabs, is all satisfied first pipe 12 and gas
Curtain air flow chamber 20 is the state being not communicated with.
The working principle of the present embodiment: lazy provided with being passed through in gas curtain air flow chamber 20 in the height of the big drop of diameter
Property gas, because being more prone to produce satellite powder at the big drop of diameter, by being passed through inert gas in gas curtain air flow chamber 20, gas
It is blown out by gas curtain air stream outlet 21, not to be crushed metal liquid stream, but is used in atomization process, form " gas curtain " stream,
After forming gas curtain air-flow, superfines that temperature can be prevented high forms bonding with the bulky grain powder that just atomization is formed, with certain
The air-flow gas curtain of flow velocity, is equivalent to the barrier of powder, and superfines can be stopped close to nebulization region, particularly near meeting blown
It walks, and then reduces the generation of satellite powder.
Embodiment 3
The method that electrode induction aerosolization continuous flow prepares globular metallic powder
(1) taking diameter is the Ti-6Al-4V alloy pole 1 of 45mm, and the angle at conical shaft section tip is 45 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus of rotary table and the height of rotary table
Between angle be 30 degree, the central diameter of load coil most great circle is 75mm, and the central diameter of load coil most ringlet is
30mm, the number of turns of coil are 5 layers, and setting output power of power supply is 35KW, output frequency 40KHz；
(3) setting of atomizer: being freely falling body nozzle using the nozzle in embodiment 1, nozzle bore top surface it is straight
Diameter is that d1 is 16mm, and the diameter of nozzle bore bottom surface is that d2 is 16.5mm, and a height of h2 in the hole of nozzle bore is 43mm, is crushed air-flow
The axial angle with nozzle bore diameter of axle direction in outlet is 27 degree, and being crushed the admission pressure at air flow inlet is 6.8MPa.The feelings
It, can be to the stronger suction force of formation on the upside of nozzle center during nozzle atomization under condition；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 1.7r/min, pole
Decrease speed is 55mm/min；
(5) be atomized: high pressure argon gas enters broken air flow chamber, gas pressure 5.5MPa, step (4) from broken air flow inlet
Middle molten metal liquid forms 4.1mm continuous flow under the suction force collective effect that its own gravity and nozzle are formed, and leads to
Nozzle bore is crossed, the argon gas through spraying from broken air flow outlet is broken, obtains globular metallic powder after cooling.
Experimental result: under conditions of the present embodiment, metal liquid stream be continuous flow state, be made powder overall particle size compared with
It is small, wherein the following granularity accounting 52.6% of 270 mesh；Fig. 4 is the following powder scanning electron microscope (SEM) photograph of 270 mesh obtained, can be with from figure
Find out that powder obtained is spherical in shape, the satellite powder on particle powder is less.
Embodiment 4
The method that electrode induction aerosolization continuous flow prepares globular metallic powder
(1) taking diameter is the Ti-48Al-2Cr-2Nb alloy pole 1 of 50mm, and the angle at conical shaft section tip is
50 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus and round platform axis of rotary table it
Between angle be 45 degree, the diameter of load coil most great circle is 80mm, and the diameter of load coil most ringlet is 20mm,
The number of turns of coil is 6 layers, and setting output power of power supply is 32KW, output frequency 50KHz；
(3) setting of atomizer: being freely falling body nozzle using the nozzle in embodiment 1,30 top surface of nozzle bore
Diameter is that d1 is 17mm, and the diameter of 30 bottom surface of nozzle bore is that d2 is 18mm, and a height of h2 in the hole of nozzle bore 30 is 37mm, is crushed
The axial angle with 30 diameter of axle direction of nozzle bore of air stream outlet 21 is 25 degree, and the admission pressure at broken air flow inlet 11 is
5.9MPa.In this case, during nozzle atomization, it can be to the stronger suction force of formation on the upside of nozzle center；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 2.0r/min, pole
Decrease speed is 60mm/min；
(5) be atomized: high pressure argon gas enters broken air flow chamber, gas pressure 5.3MPa, step (4) from broken air flow inlet
Middle molten metal liquid forms 3.8mm continuous flow under the suction force collective effect that its own gravity and nozzle are formed, and leads to
Nozzle bore is crossed, the nitrogen through spraying from broken air flow outlet is broken, obtains globular metallic powder after cooling.
Experimental result: under conditions of the present embodiment, metal liquid stream be continuous flow state, be made powder overall particle size compared with
It is small, wherein the following granularity accounting 57.7% of 270 mesh；Fig. 5 is the following powder scanning electron microscope (SEM) photograph of 270 mesh obtained, can be with from figure
Find out that powder obtained is spherical in shape, the satellite powder on particle powder is less.
Embodiment 5
The method that electrode induction aerosolization continuous flow prepares globular metallic powder
(1) taking diameter is the Ti-48Al-2Cr-2Nb alloy pole 1 of 50mm, and the angle at conical shaft section tip is
50 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus and round platform axis of rotary table it
Between angle be 45 degree, the diameter of load coil most great circle is 80mm, and the diameter of load coil most ringlet is 20mm,
The number of turns of coil is 6 layers, and setting output power of power supply is 32KW, output frequency 50KHz；
(3) setting of atomizer: being freely falling body nozzle using the nozzle in embodiment 2,30 top surface of nozzle bore
Diameter is that d1 is 17mm, and the diameter of 30 bottom surface of nozzle bore is that d2 is 18mm, and a height of h2 in the hole of nozzle bore 30 is 37mm, is crushed
The axial angle with 30 diameter of axle direction of nozzle bore of air stream outlet 21 is 25 degree, and the admission pressure at broken air flow inlet 11 is
5.9MPa.In this case, during nozzle atomization, it can be to the stronger suction force of formation on the upside of nozzle center；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 2.0r/min, pole
Decrease speed is 60mm/min；
(5) be atomized: high pressure argon gas enters from broken air flow inlet is crushed air flow chamber, gas pressure 5.3MPa, argon gas
Molten metal liquid forms the continuous liquid of mm under the suction force collective effect that its own gravity and nozzle are formed in step (4)
Stream, by nozzle bore, the argon gas through spraying from broken air flow outlet is broken, obtains globular metallic powder after cooling.
Experimental result: under conditions of the present embodiment, metal liquid stream be continuous flow state, be made powder overall particle size compared with
Small, wherein the following granularity accounting 59% of 270 mesh, the present embodiment is relative to embodiment 4, in the metal powder of preparation below 270 mesh
Granularity accounting increases.
Embodiment 6
The method that electrode induction aerosolization continuous flow prepares globular metallic powder
(1) taking diameter is the NiTi alloy pole 1 of 100mm, and the angle at conical shaft section tip is 38 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus of rotary table and the height of rotary table
Between angle be 30 degree, the central diameter of load coil most great circle is 125mm, and the central diameter of load coil most ringlet is
56mm, the number of plies of coil are 7 layers, and setting output power of power supply is 67KW, output frequency 80KHz；
(3) setting of atomizer: being freely falling body nozzle using the nozzle in embodiment 1, nozzle bore top surface it is straight
Diameter is that d1 is 25mm, and the diameter of nozzle bore bottom surface is that d2 is 25mm, and a height of h2 in the hole of nozzle bore is 60mm, and broken air-flow goes out
The axial angle with nozzle bore diameter of axle direction of mouth is 30 degree, and being crushed the admission pressure at air flow inlet is 7.5MPa.The situation
Under, it, can be to the stronger suction force of formation on the upside of nozzle center during nozzle atomization；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 30r/min, under pole
Reduction of speed degree is 61mm/min；
(5) be atomized: high pressure argon gas enters from broken air flow inlet is crushed air flow chamber, gas pressure 6MPa, in step (4)
Molten metal liquid forms 3.3mm continuous flow, passes through under the suction force collective effect that its own gravity and nozzle are formed
Nozzle bore, the argon gas through spraying from broken air flow outlet is broken, obtains globular metallic powder after cooling.
Experimental result: under conditions of the present embodiment, metal liquid stream be continuous flow state, be made powder overall particle size compared with
It is small, wherein the following granularity accounting 78% of 270 mesh.
Comparative example 1
The method that electrode induction aerosolization prepares globular metallic powder
(1) taking diameter is the Ti-48Al-2Cr-2Nb alloy pole 1 of 50mm, and the angle at conical shaft section tip is
22 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus and round platform axis of rotary table it
Between angle be 45 degree, the diameter of load coil most great circle is 80mm, and the diameter of load coil most ringlet is 77mm,
The number of turns of coil is 8 layers, and setting output power of power supply is 32KW, output frequency 50KHz；
(3) setting of atomizer: using the nozzle in embodiment 1, the diameter of nozzle bore top surface is that d1 is 27mm, spray
The diameter of mouth inner hole bottom surface is that d2 is 26mm, and a height of h2 in the hole of nozzle bore is 37mm, is crushed air stream outlet axially and in nozzle
The angle in hole diameter of axle direction is 25 degree, and being crushed the admission pressure at air flow inlet is 5.9MPa.In this case, nozzle atomization process
In, it can be to the stronger suction force of formation on the upside of nozzle center；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 2.0r/min, pole
Decrease speed is 60mm/min；
(5) be atomized: high pressure argon gas enters broken air flow chamber, gas pressure 5.5Mpa, step (4) from broken air flow inlet
Middle molten metal liquid is under the action of its own gravity, by nozzle bore, the argon through being sprayed from broken air flow outlet
Gas is broken, obtains globular metallic powder after cooling.
Experimental result: under the conditions of the present embodiment, metal liquid can not form continuous liquid stream, form drop, be made
The following granularity accounting of 270 mesh of powder it is lower, accounting 34%.
Comparative example 2
The method that electrode induction aerosolization prepares globular metallic powder
(1) taking diameter is the Ti-48Al-2Cr-2Nb alloy pole 1 of 50mm, and the angle at conical shaft section tip is
22 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, the bus and round platform axis of rotary table it
Between angle be 45 degree, the diameter of load coil most great circle is 50mm, and the diameter of load coil most ringlet is 20mm,
The number of turns of coil is 8 layers, and setting output power of power supply is 32KW, output frequency 50KHz；
(3) setting of atomizer: using the nozzle in embodiment 1, the diameter of nozzle bore top surface is that d1 is 28mm, spray
The diameter of mouth inner hole bottom surface is that d2 is 33mm, and a height of h2 in the hole of nozzle bore is 37mm, is crushed air stream outlet axially and in nozzle
The angle in hole diameter of axle direction is 25 degree, and being crushed the admission pressure at air flow inlet is 5.9MPa.In this case, nozzle atomization process
In, it can be to the stronger suction force of formation on the upside of nozzle center；
(4) electrode induction melting: under inert gas shielding state, by the cone point of the pole prepared in step (1)
Corresponding load coil is held, pole as center line rotation and is moved down using its axis, and pole revolving speed is 0.45r/min, pole
Decrease speed is 60mm/min；
(5) be atomized: high pressure argon gas enters broken air flow chamber, gas pressure 5.5Mpa, step (4) from broken air flow inlet
Middle molten metal liquid is under the action of its own gravity, by nozzle bore, the nitrogen through being sprayed from broken air flow outlet
Gas is broken, obtains globular metallic powder after cooling.
Experimental result: under the conditions of the present embodiment, metal liquid can not form continuous liquid stream, form drop, be made
The following granularity accounting of 270 mesh of powder it is lower, accounting 33%.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
It is within the scope of the invention with present inventive concept without the various process programs of substantial differences.
Claims (10)
1. a kind of method that electrode induction aerosolization continuous flow prepares globular metallic powder, it is characterised in that: including following step
It is rapid:
(1) pretreatment of raw material: conical tip is processed into one end of round metal bars by preparation round metal bars, the pole it is straight
Diameter is 15-150mm, and the angle a at conical shaft section tip is 30-75 degree；
(2) setting of load coil: load coil encloses reverse frustoconic, between the bus and round platform axis of rotary table
Angle is 10-75 degree, and the central diameter of load coil most great circle is 1.2-1.7 times of diameter of the rod, and load coil is minimum
The central diameter of circle is 0.1-1.5 times of diameter of the rod, and the number of turns of the induction coil is 2-7 layers；The load coil adds
The output power of thermoelectric generator is 20-130KW, output frequency 20-310KHz；
(3) setting of atomizer: for the atomizer in the underface of load coil, the atomizer includes broken
Air flow chamber, being crushed is perforative nozzle bore in the middle part of air flow chamber, and the broken air flow chamber is equipped with broken air flow inlet；It is described broken
Broken air flow chamber is equipped with broken air stream outlet, and towards nozzle bore, air-flow is formed to fall the gas direction sprayed by broken air stream outlet
Triangular pyramidal；The nozzle bore is in truncated cone-shaped or cylinder, when nozzle bore is in truncated cone-shaped, the diameter of the nozzle bore
In up-small and down-big, the diameter of the nozzle bore top surface is 10-26mm, and the diameter of the nozzle bore bottom surface is 10-35mm, institute
The a height of 23-75mm in hole of nozzle bore is stated, the admission pressure at the broken air flow inlet is 1.2-8.5Mpa, the broken gas
The axial angle with nozzle bore diameter of axle direction of outflux is in 5-87 degree；
(4) electrode induction melting: under inert gas shielding state, by the conical tip pair of the pole prepared in step (1)
Load coil is answered, pole as center line rotation and is moved down using its axis, and the revolving speed of the pole is 0.5-2.7r/
Min, the decrease speed of pole are 30-150mm/min,
(5) be atomized: in step (4) molten metal liquid under the suction force collective effect that its own gravity and nozzle are formed,
Continuous flow is formed, by nozzle bore, is crushed through spraying inert gas from broken air flow outlet, spherical gold is obtained after cooling
Belong to powder.
2. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the round metal bars are fusing point in 2500 DEG C of pure metal or metal alloy below.
3. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the metal is one of titanium, titanium alloy, cobalt-base alloys, nickel-base alloy, ferrous alloy.
4. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the diameter of the continuous flow of formation is 2.2-5.3mm.
5. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the gas being passed through at the broken air flow inlet is inert gas.
6. the method that electrode induction aerosolization continuous flow according to claim 5 prepares globular metallic powder, feature
Be: the inert gas includes one of argon gas, nitrogen, argon gas or a variety of.
7. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the material of the load coil is copper tube.
8. the method that electrode induction aerosolization continuous flow according to claim 1 prepares globular metallic powder, feature
Be: the atomizer further includes gas curtain air flow chamber, and gas curtain air flow chamber is equipped with gas curtain air stream outlet, gas curtain air stream outlet distance
The distance of nozzle bore is greater than broken distance of the air stream outlet apart from nozzle bore, the gas direction sprayed by gas curtain air stream outlet
Parallel with nozzle bore direction or backwards to nozzle bore, gas curtain air stream outlet and broken air stream outlet are contour.
9. the method that electrode induction aerosolization continuous flow according to claim 8 prepares globular metallic powder, feature
Be: the broken air flow chamber, gas curtain air flow chamber are annular chamber, and gas curtain air flow chamber is be looped around broken air flow chamber periphery only
Vertical chamber, is crushed at the broken air flow inlet of air flow chamber and is equipped with first pipe, and first pipe is broken across connection by gas curtain air flow chamber
Air flow inlet is equipped with second pipe at the gas curtain air flow inlet of gas curtain air flow chamber.
10. the method that electrode induction aerosolization continuous flow according to claim 8 prepares globular metallic powder, feature
Be: the gas curtain air flow chamber is the independent annular chamber in broken air flow chamber, is set at the broken air flow inlet of broken air flow chamber
There is first pipe, is equipped with second pipe at the gas curtain air flow inlet of gas curtain air flow chamber.
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