CN105719826A - Magnetic-field heat treatment method of nanocrystal magnetic core - Google Patents
Magnetic-field heat treatment method of nanocrystal magnetic core Download PDFInfo
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- CN105719826A CN105719826A CN201610046537.0A CN201610046537A CN105719826A CN 105719826 A CN105719826 A CN 105719826A CN 201610046537 A CN201610046537 A CN 201610046537A CN 105719826 A CN105719826 A CN 105719826A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/03—Amorphous or microcrystalline structure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2241/00—Treatments in a special environment
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- Crystallography & Structural Chemistry (AREA)
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- Soft Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a magnetic-field heat treatment method of a nanocrystal magnetic core. According to the method, a transverse magnetic field is applied to heat treatment by combining a known process condition during actual production on the premise of meeting market application demand, the magnetic-field heat treatment process step is particularly considered and refined from different magnetism steps and by changing the size of magnetism current, an optimal magnetism mode of an initial heat preservation temperature of 330 DEG C to a cooling finish step and the additionally-arranged transverse magnetic field is finally obtained, and the size of the magnetism current is preferably 80-140A. The high induction value of the magnetic core sample in such heat treatment condition is maintained, the coercive force and the iron loss are obviously reduced, thus, the comprehensive performance of the magnetic core is more excellent, and the market application prospect of a nanocrystal magnetic core product is expanded.
Description
Technical field
The invention belongs to nanocrystalline magnet core technical field, particularly to the magnetic-field heat treatment work of a kind of nanocrystalline magnet core
Skill.
Background technology
Soft magnetic materials has the magnetic characteristic such as low-coercivity, high magnetic permeability, is to make inducer, choke coil, sensing
The raw material of the magnetic cores such as device, is used widely in industries such as electric power, motor and electronics the most.Up to now,
For the soft magnetic materials of engineer applied, because of its soft magnetic characteristic with use power, the different condition of frequency and be divided into gold
Belong to soft magnetic materials (such as ingot iron, silicon steel, permalloy), soft magnetic ferrite, amorphous and nano-crystal soft-magnetic
Material.The coercivity of traditional metal soft magnetic material is of a relatively high, limits its application in soft magnetism field；Soft
Magnetic ferrites is unfavorable for the miniaturization of electronic devices and components because saturation induction density is relatively low；And nanometer crystal alloy soft magnetism
Material is as the brand-new material in this field, because having high saturated magnetic induction, high magnetic permeability, low damage simultaneously
The advantages such as consumption (far below silicon steel), high resistivity and high-strength tenacity, have attracted the attention of numerous researcher,
The most put into production application from the research initial stage, and its preparation technology is simple, energy-conserving and environment-protective, in minority field portion
Divide and instead of traditional silicon steel and Ferrite Material.
Core material involved in the present invention belongs to nano crystal soft magnetic material, is by noncrystal substrate and to be distributed in base
There is on body α-Fe (Si) the nanocrystal composition of nano-grade size, non-crystaline amorphous metal part can be made by heat treatment
Crystallization obtains.Its performance has had both high saturated magnetic induction and the amorphous state soft magnetism material of traditional crystalline state soft magnetic materials
The multiple advantages such as low-coercivity, high magnetic permeability and the low-loss of material, can meet all kinds of electronic device to the highest
The demand of aspect energy-conservation, integrated development, and prepare simple, with low cost, the market demand has a extensive future.
In actual production, general employing chilling solidification technology is by the copper roller of melted molten steel spray to cast to high speed rotating
Cool down rapidly, obtain thickness be 18-24 μm, width be the amorphous thin ribbon of 30-50mm, use roller to cut technology
Obtain the amorphous band sample of required width, and wound the iron core preparing required size specification.At crystallization heat
Reason is to obtain nanocrystalline important process step, typically realizes receiving by the regulation and control of annealing temperature and temperature retention time
The Quick uniform of meter Jing Jing grain separates out to obtain excellent soft magnet performance.And in actual production process, be satisfied
The requirement of some special magnetic property of material, needs combined magnetic field condition that magnetic core is carried out heat treatment.Add as material
The one of work technique, magnetic-field heat treatment technique includes transverse magnetic field heat treatment, longitudinally magnetic heat treatment, rotary magnetic
Heat treatment, strong Constant charge soil heat treatment and pulsed magnetic field heat treatment etc., its objective is the single shaft by inducting respectively to
The opposite sex optimizes the shape of the hysteresis curve (B-H) of material softer magnetic property and change material.For nanocrystalline soft
Magnetic material, the available calm long and narrow hysteresis curve of transverse magnetic field annealing, make material have low permanent pcrmeability, low
Residual magnetic flux density, and low-loss.And soft magnetic materials be used as the device such as inducer, choke coil time, inductance is
The important parameter of this kind of device, its inductance value is the biggest, thus the most sensitive to AC signal, the most easily produces friendship
Drain off and disturb signal impedance effect.Therefore, high inductance characteristic and excellent soft magnet performance are that nano crystal soft magnetic material is in reality
Key in the application of border.
At present, combining nanocrystalline magnet core inductance characteristic in the research optimizing soft magnet performance, scientific research personnel explores
And applied for multinomial national inventing patent in terms of Technology for Heating Processing, specifically include:
Chinese patent application CN103117153A discloses common mode inductance iron based nano crystal iron core and preparation side thereof
Method.This common mode inductance iron based nano crystal iron core uses flat board stream liquisol quenching legal system band, coiling iron core and heat treatment
Prepared by step, heat treatment process divides two sections of insulations, and in the first stage, insulation applies longitudinal magnetic field, and second stage is executed
Add transverse magnetic field.But the inductance decay of magnetic core is relatively big in this patent, when superposition bias direct current is 50A, its
Inductance attenuation is close to 20%.
Chinese patent application CN102363830A discloses the heat treatment method of a kind of common mode inductance magnetic core.
This heat treatment method uses without magnetic-field annealing, by the test of temperature and time is obtained optimum annealing temperature is
560 DEG C-570 DEG C, temperature retention time 60 minutes.But in this patent, the iron loss of magnetic core is higher, at 0.5T, 20kHz
Under the conditions of 0.2T, 100kHz, its iron loss respectively reaches 23.6W/kg, 61.8W/kg.
Chinese patent application CN102363830A discloses the heat treatment method of a kind of ultracrystalline magnetic core.This heat
Processing method is 560 DEG C-570 DEG C again by the test of temperature and time is obtained optimum annealing temperature, insulation
60 minutes time.But magnetic core coercivity is higher in this patent, close to 0.9A/m, and magnetic core is at 0.5T, 20kHz
The highest with the iron loss under the conditions of 0.2T, 100kHz, respectively 26W/kg, 65W/kg.
In sum, existing invention exists the feelings that inductance value decay is too high compared with big, magnetic core coercivity and iron loss
Condition.Therefore, the magnetic field heat treatment process in the present invention pays close attention to magnetic while optimizing nanocrystalline magnet core soft magnet performance
The change of core inductance, it is desirable on the premise of keeping magnetic core high inductance value, at utmost optimize its soft magnet performance,
Reducing coercivity and iron loss, this applies significant for the exploitation of nanocrystalline magnet core product.
Summary of the invention
Technical problem: the present invention considers the performance requirement feature of the magnetic core such as inducer, choke coil in actual production,
For the deficiency in existing magnetic core Technology for Heating Processing, it is provided that the magnetic field heat treatment process of a kind of nanocrystalline magnet core, make
Must be more superior through the magnetic core sample soft magnet performance after this PROCESS FOR TREATMENT, and still ensure the high inductance value of magnetic core, this
The combination property of magnetic core product, the application market of developing magnetic core product can be significantly improved.
Technical scheme: the present invention provides the magnetic field heat treatment process of a kind of nanocrystalline magnet core, it is characterised in that the party
Method is in three stages:
First stage is: magnetic core from room temperature heat 30 minutes to initial holding temperature, the initial temperature of the i.e. first crystallization
Degree Tx1200 DEG C below, and it is incubated 15 minutes, it is therefore intended that ensure heat-treatment furnace furnace chamber even heat；
Second stage is: initial insulation terminates post-heating and arrives secondary holding temperature, i.e. α-Fe (Si) crystal grain in 45 minutes
Just start the temperature separated out, and be incubated 60 minutes, it is therefore intended that increase nanocrystalline Enhancing Nucleation Density, and ensure
Even heat inside and outside magnetic core, eliminates iron core and produces internal stress because heating is too fast；
Phase III is: secondary insulation terminates post-heating 45 minutes to final holding temperature, i.e. Tx140 DEG C below
To Tx1Above 40 DEG C, it is therefore intended that ensure that magnetic core complete crystallization, insulation stop heating, and wind after terminating immediately
Cold and circulating water is to room temperature；
Heat treatment process starts to cooling to terminate additional transverse electric and magnetic field from initial insulation, makes magnetic core keep height
On the premise of inductance, significantly reduce its coercivity and iron loss.
Preferred:
Described initial holding temperature is 300-350 DEG C, and secondary holding temperature is 460-490 DEG C, is finally incubated
Temperature is 500-580 DEG C.
Described initial holding temperature is preferably 330 DEG C, and secondary holding temperature is preferably 480 DEG C, is finally incubated
Temperature is preferably 550 DEG C.
Described additional transverse electric and magnetic field, its size of current is 60-200A,
Described its size of current of additional transverse electric and magnetic field is preferably 80-140A.
Wherein after transverse magnetic field heat treatment, magnetic core inductance under 0.3V, 20kHz test condition is 10-14.5
μ H, compared with the inductance value after common heat treatment, its maximum attenuation amount is less than 10%.
Wherein after transverse magnetic field heat treatment, magnetic core produces the bigger anisotropic K that inductsu, effectively optimize
The magnetic property of magnetic core also makes hysteresis curve calmization, reduces coercivity and iron loss.
Wherein after transverse magnetic field heat treatment, magnetic core saturation induction density is 1.2-1.21T, and coercivity is
0.45-0.8A/m, preferably 0.45-0.6A/m, the iron loss under the conditions of 0.2T, 20kHz is 1.47-1.8
W/kg, preferably 1.47-1.6W/kg, the iron loss under the conditions of 0.5T, 20kHz is 6.1-8.1W/kg,
It is preferably 6.1-7.0W/kg.
Beneficial effect: in sum, the present inventor's research practice based on long-term soft magnetic materials technical field,
In conjunction with producing the Technology for Heating Processing of nano-crystal soft magnetic alloy in reality, add the magnetic stage and change adds magnetoelectricity from different
The size of stream specifically considers and refines additional transverse magnetic field Technology for Heating Processing step, and final contrast magnetic core product is comprehensive
Performance obtains optimum magnetic field Technology for Heating Processing, and the remarkable advantage of this technique is:
(1) the high inductance value under the conditions of core inductance keeps common heat treatment the most substantially, this is commercial Application
Precondition.
(2) coercivity and iron loss substantially reduce, and therefore the combination property of magnetic core is more excellent, and this has opened up and has received
The brilliant magnetic core series products market of rice and application prospect.
With embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.For purposes of brevity, this Shen
Record all different-thickness amorphous ribbons in embodiment the most one by one, it will be understood that the application specifically remembers
Carry and disclose all different-thickness amorphous ribbons of described technical scheme.
Accompanying drawing explanation
Fig. 1 is the DSC curve of alloy strip in the embodiment of the present invention 1.
Fig. 2 is alloy strip X ray diffracting spectrum after different temperatures heat treatment in the embodiment of the present invention 1.
Fig. 3 is that in the embodiment of the present invention 1, after common heat treatment, core inductance and coercivity variation with temperature are closed
System.
Fig. 4 is different core inductance and the coercivity comparison diagrams adding the magnetic stage in the embodiment of the present invention 1, and illustration is
Add magnetic heat treatment process curve.
Fig. 5 is to change under the conditions of TF1 in the embodiment of the present invention 1 to add core inductance and coercivity pair after magnetoelectricity stream
Than figure.
Fig. 6 is that in the embodiment of the present invention 1, loss under the conditions of common heat treatment and magnetic-field heat treatment is strong with magnetic induction
Degree change curve.
Fig. 7 is that in the embodiment of the present invention 1, loss under the conditions of common heat treatment and magnetic-field heat treatment changes with frequency
Curve.
Detailed description of the invention
First pass through the analysis to alloy thermal property and crystallization behavior and determine initial crystallization temperature and secondary crystallization
Temperature the condition in production practices that combines determine three different phase holding temperatures and the technique of common heat treatment,
It is characterized in that:
First stage is: magnetic core from room temperature heat 30 minutes to initial holding temperature, i.e. 300-350 DEG C, preferably
It is 330 DEG C, and is incubated 15 minutes, it is therefore intended that ensure heat-treatment furnace furnace chamber even heat；
Second stage is: initial insulation terminates post-heating 45 minutes to secondary holding temperature, i.e. 460-490 DEG C,
It is preferably 480 DEG C, and is incubated 60 minutes, it is therefore intended that increase nanocrystalline Enhancing Nucleation Density, and ensure magnetic core
Inside and outside even heat, eliminates iron core and produces internal stress because heating is too fast；
Phase III is: secondary insulation terminates post-heating 45 minutes to final holding temperature, i.e. 500-580 DEG C,
It is preferably 550 DEG C, it is therefore intended that ensure that magnetic core complete crystallization, insulation stop heating after terminating immediately, and air-cooled
With circulating water to room temperature；
All being not added with magnetic field at three phases is common heat treatment, after common heat treatment different tape thickness magnetic cores 0.3V,
Inductance value under 100kHz test condition is 10-16 μ H, and magnetic core coercivity is 1.9-2.0A/m, 0.2T,
Under the conditions of 20kHz, iron loss is 1.7-2.2W/kg, and under the conditions of 0.5T, 20kHz, iron loss is 10-12W/kg.
Under common heat treatment precondition, the present invention applies transverse magnetic field from the different stages respectively and adds magnetoelectricity
Stream size keeps consistent (adding magnetoelectricity stream 100A), sets three kinds of differences altogether and adds the magnetic stage:
The first: start to cooling ending phase to apply transverse magnetic field (TF1) from 330 DEG C of insulations；
The second: start to cooling ending phase to apply transverse magnetic field (TF2) from 480 DEG C of insulations；
The third: start to cooling ending phase to apply transverse magnetic field (TF3) from 550 DEG C of insulations；
It is TF1 that com-parison and analysis inductance characteristic and soft magnetic characteristic are most preferably added the heat treatment condition under the magnetic stage, should
Under the conditions of different tape thickness core inductance be 10-15 μ H, and coercivity is minimum, different tape thickness magnetic core coercivitys
All it is not higher than 0.7A/m.
Above-mentioned TF1 heat treatment process changes and adds the size of magnetoelectricity stream, set and the most different outer power up
Stream (80-140A), and com-parison and analysis difference adds the inductance characteristic under the conditions of magnetoelectricity stream and soft magnet performance understands warp
After transverse magnetic field heat treatment, magnetic core saturation induction density is 1.2-1.21T, and coercivity is 0.45-0.8A/m,
Being preferably 0.45-0.6A/m, the iron loss under the conditions of 0.2T, 20kHz is 1.47-1.8W/kg, is preferably
1.47-1.6W/kg, the iron loss under the conditions of 0.5T, 20kHz is 6.1-8.1W/kg, preferably 6.1-7.0
W/kg。
In above-mentioned steps, as preferably, heat treatment is always ensured that in annealing furnace cavity coarse vacuum (about 1 × 10-3
Pa)。
In above-mentioned steps, it is 18-24 μm that AMORPHOUS ALLOY RIBBONS thickness is preferably, and strip width is 10mm,
Ring-shaped magnetic core dimensions is 20 (external diameter) × 14 (internal diameter) × 10 (wide) mm.
Embodiment 1:
In the present embodiment, cut rear coiling obtaining dimensions by 20 μ m-thick amorphous ribbon rollers is 20 × 14 × 10mm
Toroidal core.
Step 1: by the analysis of alloy thermal property and crystallization behavior and to combine the condition in production practices true
Determine ordinary heat treatment.
Step 2: common heat treatment post analysis compares core inductance characteristic and soft magnetic characteristic now core inductance value is
14.5 μ H, and the magnetic core coercivity under the conditions of this heat treatment is 1.9A/m, magnetic core is at 0.2T, 20kHz bar
Under part, iron loss is 2.2W/kg, and under the conditions of 0.5T, 20kHz, iron loss is 10.8W/kg.
Step 3: add the magnetic stage by three kinds of differences under the conditions of common heat treatment and carry out magnetic-field heat treatment, add magnetoelectricity
Stream is 100A.
The first: start to cooling ending phase to apply transverse magnetic field (TF1) from 330 DEG C of insulations；
The second: start to cooling ending phase to apply transverse magnetic field (TF2) from 480 DEG C of insulations；
The third: start to cooling ending phase to apply transverse magnetic field (TF3) from 550 DEG C of insulations；
Finally give the coercivity that TF1 adds under the conditions of magnetic minimum, for 0.7A/m, under the conditions of this heat treatment
Magnetic core iron loss under the conditions of 0.2T, 20kHz be 1.78W/kg, iron loss under the conditions of 0.5T, 20kHz
For 8.0W/kg.
Step 4: adding to change under the conditions of magnetic and add magnetoelectricity stream at TF1, current intensity be preferably 80A, 100A,
120A, 140A, obtaining core inductance under the conditions of these four difference adds magnetoelectricity stream is 13.7-14.3 μ H, and
Magnetic core coercivity is 0.6-0.8A/m, and now magnetic core iron loss under the conditions of 0.2T, 20kHz is 1.6-1.8W/kg,
Magnetic core iron loss under the conditions of 0.5T, 20kHz is 7.0-8.1W/kg.
The above analysis is it can be seen that the magnetic core of 20 μm thickness of strip is by magnetic-field heat treatment bar in the present invention
Process under part obtains inductance value relatively common heat treatment attenuation maximum only 5.5%, and coercivity and core loss value are then
Substantially reduce.
Fig. 1 show Fe in step 173.5Cu1Nb3Si15.5B7The DSC curve of alloy strip, the intensification of measurement
Speed is 0.67 DEG C/s.Alloy the first crystallization initial temperature T as seen from the figurex1Being 536 DEG C, the second crystallization rises
Beginning temperature Tx2It it is 706 DEG C.
Fig. 2 show in step 1 X ray diffracting spectrum analyzing AMORPHOUS ALLOY RIBBONS crystallization behavior.By scheming
Can be seen that non-crystaline amorphous metal, after 480 DEG C of annealing 10 minutes, has had the α-Fe (Si) of trace to separate out mutually, therefore
Select 480 DEG C carrying out secondary insulation is to increase nanocrystalline Enhancing Nucleation Density.And anneal 10 minutes at 550 DEG C
After, three characteristic diffraction peaks of α-Fe (Si) can substantially be detected, illustrate that this alloy is on crystallization the first rank
What section separated out is single-phase α-Fe (Si) crystal grain.When annealing temperature is more than Tx2Time, there is (Fe, Si)3B、Fe2Nb
And Fe5SiB2Produce mutually Deng Hard Magnetic.
Fig. 3 show inductance and the coercivity variations in temperature relation of magnetic core after common heat treatment in step 2.By
Figure can be seen that the inductance of magnetic core raises first increases and then decreases with temperature, and in 550 DEG C of insulations annealing in 60 minutes
Under the conditions of there is maximum 14.5 μ H, the test condition of inductance parameters is voltage 0.3V and frequency 100kHz.
And the magnetic core coercivity determined by DC hysteresis loops measuring instrument be can be seen that and is incubated 60 minutes at 550 DEG C
Under annealing conditions, coercivity has maximum 1.9A/m.
Fig. 4 show in step 3 different core inductance and the coercivity comparison diagram adding the magnetic stage, and illustration is for adding magnetic
Heat treatment cycle curve.After adding magnetic heat treatment as seen from the figure, the inductance of magnetic core is held essentially constant, and coercive
Power is all far below the numerical value of common heat treatment, and under the conditions of TF1 (adding magnetoelectricity stream 100A) magnetic-field heat treatment
Coercivity relatively minimal.
Fig. 5 show in step 4 to change under the conditions of TF1 and adds core inductance and coercivity comparison diagram after magnetoelectricity stream.
Core inductance is held essentially constant as seen from the figure, and when adding magnetoelectricity stream and increasing to 80A, coercivity shows
Write and reduce, and along with adding the further increase of magnetoelectricity stream, coercivity persistently reduces, but the amplitude reduced is increasingly
Gently, when adding magnetoelectricity stream 140A, coercivity is relatively minimal.
Fig. 6 show the loss under the conditions of common heat treatment and magnetic-field heat treatment with magnetic induction change curve.
When frequency is 20kHz as seen from the figure, iron loss increases along with magnetic induction and is gradually increased, but increases
Trend is the most inconspicuous, and magnetic-field heat treatment can effectively reduce iron loss, and it is the biggest to add magnetoelectricity stream, and iron loss growth trend is more
Slowly.
Fig. 7 show the loss under the conditions of common heat treatment and magnetic-field heat treatment with frequency variation curve.Can by figure
During to find out magnetic induction for 0.2T, iron loss increases along with frequency and is gradually increased, and magnetic-field heat treatment can have
Effect reduces iron loss, and it is the biggest to add magnetoelectricity stream, and iron loss growth trend is the slowest, and therefore adding magnetoelectricity intensity of flow has
It is beneficial to improve the frequency characteristic of magnetic core.
Table 1 below. in give the magnetic core magnetic performance under Different Heat Treatment Conditions and inductance characteristic, as a comparison be
Use better performances in the comparative example and existing market application that published heat treatment method carries out testing
FINEMET nano-crystal soft magnetic alloy.Comparative example 3,4 is respectively by Chinese patent application
Optimal common heat treatment temperature disclosed in CN102363830A and CN102363830A (560 DEG C and
570 DEG C) and the temperature retention time heat treatment condition of 60 minutes the magnetic core that tape thickness in the present invention is 20 μm is carried out heat
Processing, comparative example 5 selects the FINEMET system alloy in document J.Appl.Phys.64 (1988) 6044.
Magnetic core magnetic performance under table 1. Different Heat Treatment Conditions and inductance characteristic contrast
In upper table embodiment, magnetic core tape thickness is 20 μm, P2/20kAnd P5/20kRepresent magnetic strength 0.2T and 0.5 respectively
T, the iron loss under frequency 20kHz.Properties Data Comparison from table 1. it can be seen that
1) in the present invention, embodiment 1 tape thickness is that the magnetic core of 20 μm inductance under the conditions of magnetic-field heat treatment compares ordinary hot
Process is held essentially constant, and is 13.7 μ H-14.5 μ H, maximum attenuation amount the most only 5.5%；And in contrast
The inductance value of embodiment magnetic core after heat treatment is the most too low, respectively 9.0 μ H and 8.7 μ H.
2) in the present invention, embodiment 1 tape thickness is that the magnetic core of 20 μm coercivity under the conditions of common heat treatment is relatively big, but
Substantially reduce after magnetic-field heat treatment, minimum only 0.6A/m, this and FINEMET in comparative example 1
Coercivity size close, and iron loss is below FINEMET alloy.
3) embodiment of the present invention 1 tape thickness is that the magnetic core of 20 μm iron loss under the conditions of common heat treatment is relatively big, but passes through
After magnetic-field heat treatment, iron loss substantially reduces, minimum iron loss P2/20kHz=1.6W/kg, P5/20kHz=7.0W/kg.
Embodiment 2:
In the present embodiment, tape thickness is respectively the amorphous ribbon roller of 18 μm, 20 μm, 22 μm and 24 μm
Cut rear coiling obtaining dimensions is 20 × 14 × 10mm toroidal core.At the heat of different thickness of strip magnetic cores
Reason processing step and performance variation tendency are completely the same with embodiment 1, for the purpose that content is succinct, illustrate attached
Figure omits and is the most entirely given, but the soft magnet performance under the conditions of TF1 (adding magnetoelectricity stream 140A) magnetic-field heat treatment and electricity
Sense characteristic is all discussed in detail.
Common heat treatment post analysis compares core inductance characteristic and the soft magnet performance of four kinds of different tape thickness, now magnetic core
Inductance value is 10-16 μ H, and coercivity is 1.9-2.0A/m, and magnetic core is iron loss under the conditions of 0.2T, 20kHz
For 1.7-2.2W/kg, under the conditions of 0.5T, 20kHz, iron loss is 10-12W/kg.
Core inductance value under the conditions of TF1 (adding magnetoelectricity stream is 140A) heat treatment is about 10-14.5 μ H,
And coercivity is 0.45-0.6A/m, magnetic core iron loss under the conditions of 0.2T, 20kHz is 1.47-1.6W/kg simultaneously,
Under the conditions of 0.5T, 20kHz, iron loss is 6.1-7W/kg.
From the change of above-mentioned inductance and soft magnetic characteristic it can be seen that compare common heat treatment, magnetic core (adds at TF1
Magnetoelectricity stream is 140A) inductance maximum attenuation amount is less than 10% under the conditions of heat treatment, and coercivity and iron loss are equal
Substantially reduce.
The different tape thickness magnetic core performance comparison under the conditions of TF1 (adding magnetoelectricity stream 140A) magnetic-field heat treatment of table 2.
Properties Data Comparison from table 2. it can be seen that
1) in the present invention, the core inductance of the different tape thickness of embodiment 2 has difference, and band is the thinnest, and core inductance is the biggest.
2) in the present invention magnetic core of the different tape thickness of embodiment 2 at TF1 (adding magnetoelectricity stream 140A) magnetic-field heat treatment bar
Under part, coercivity numerical value is low, for 0.45-0.6A/m.
3) in the present invention magnetic core of the different tape thickness of embodiment 2 at TF1 (adding magnetoelectricity stream 140A) magnetic-field heat treatment bar
Under part, iron loss is the most on the low side, and wherein under the conditions of 0.2T, 20kHz, iron loss is 1.47-1.6W/kg, low
FINEMET iron loss under this condition in comparative example 5, magnetic core is in 0.5T, 20kHz condition simultaneously
Lower iron loss is 6.1-7.0W/kg.
Technical scheme has been described in detail by embodiment described above, it should be understood that above institute
State the specific embodiment of the only present invention, be not limited to the present invention, all institutes in the spirit of the present invention
Any amendment made and improvement etc., should be included within the scope of the present invention.
Claims (7)
1. the magnetic field heat treatment process of a nanocrystalline magnet core, it is characterised in that the method in three stages:
First stage is: magnetic core from room temperature heat 30 minutes to initial holding temperature, the i.e. first crystallization initial temperature Tx1200 DEG C below, and it is incubated 15 minutes, it is therefore intended that ensure heat-treatment furnace furnace chamber even heat；
Second stage is: initial insulation terminates post-heating and arrives secondary holding temperature in 45 minutes, i.e. α-Fe (Si) crystal grain just starts the temperature separated out, and it is incubated 60 minutes, purpose is to increase nanocrystalline Enhancing Nucleation Density, and ensure even heat inside and outside magnetic core, eliminate magnetic core and produce internal stress because heating is too fast；
Phase III is: secondary insulation terminates post-heating 45 minutes to final holding temperature, i.e. Tx140 DEG C are arrived T belowx1Above 40 DEG C, it is therefore intended that ensure that magnetic core complete crystallization, insulation stop heating after terminating immediately, and air-cooled and circulating water is to room temperature；
Heat treatment process starts to cooling to terminate additional transverse electric and magnetic field from initial insulation, makes magnetic core on the premise of keeping high inductance, significantly reduce its coercivity and iron loss.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterised in that described initial holding temperature is 300-350 DEG C, and secondary holding temperature is 460-490 DEG C, and final holding temperature is 500-580 DEG C.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterised in that described initial holding temperature is preferably 330 DEG C, secondary holding temperature is preferably 480 DEG C, and final holding temperature is preferably 550 DEG C.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterised in that described additional transverse electric and magnetic field, its size of current is 60-200A.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterised in that described its size of current of additional transverse electric and magnetic field is preferably 80-140A.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterized in that after the method heat treatment, magnetic core inductance under 0.3V, 20kHz test condition is 10-14.5 μ H, and compared with the inductance value after common heat treatment, its maximum attenuation amount is less than 10%.
The magnetic field heat treatment process of nanocrystalline magnet core the most according to claim 1, it is characterized in that after the method heat treatment, the coercivity of magnetic core is 0.45-0.6A/m, and the iron loss under the conditions of 0.2T, 20kHz is 1.47-1.6W/kg, and the iron loss under the conditions of 0.5T, 20kHz is 6.1-7.0W/kg.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107417A (en) * | 1989-09-21 | 1991-05-07 | Hitachi Metals Ltd | Production of supermicrocrystalline soft magnetic alloy |
| CN101824512A (en) * | 2010-05-21 | 2010-09-08 | 上海世路特种金属材料有限公司 | Electromagnet type transverse magnetic field heat treatment equipment and method for preparing permanent magnet iron corepermanent magnet |
| CN102363830A (en) * | 2011-10-26 | 2012-02-29 | 青岛云路新能源科技有限公司 | Heat treatment method for ultracrystalline magnetic core |
| CN103117154A (en) * | 2013-03-06 | 2013-05-22 | 安泰科技股份有限公司 | Inverter welding machine power transformer nanocrystalline iron core and preparation method thereof |
| CN103117153A (en) * | 2013-03-06 | 2013-05-22 | 安泰科技股份有限公司 | Common mode inductance iron-based nanocrystalline iron core and preparation method of the same |
| CN104451071A (en) * | 2014-11-13 | 2015-03-25 | 北京冶科磁性材料有限公司 | Heat treatment method for low-loss and medium and high-frequency iron-based nanocrystalline transformer iron cores |
| CN104775014A (en) * | 2015-04-27 | 2015-07-15 | 贵州鑫湄纳米科技有限公司 | Heat treatment method of amorphous/microcrystalline iron-base magnetic cores |
-
2016
- 2016-01-22 CN CN201610046537.0A patent/CN105719826A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107417A (en) * | 1989-09-21 | 1991-05-07 | Hitachi Metals Ltd | Production of supermicrocrystalline soft magnetic alloy |
| CN101824512A (en) * | 2010-05-21 | 2010-09-08 | 上海世路特种金属材料有限公司 | Electromagnet type transverse magnetic field heat treatment equipment and method for preparing permanent magnet iron corepermanent magnet |
| CN102363830A (en) * | 2011-10-26 | 2012-02-29 | 青岛云路新能源科技有限公司 | Heat treatment method for ultracrystalline magnetic core |
| CN103117154A (en) * | 2013-03-06 | 2013-05-22 | 安泰科技股份有限公司 | Inverter welding machine power transformer nanocrystalline iron core and preparation method thereof |
| CN103117153A (en) * | 2013-03-06 | 2013-05-22 | 安泰科技股份有限公司 | Common mode inductance iron-based nanocrystalline iron core and preparation method of the same |
| CN104451071A (en) * | 2014-11-13 | 2015-03-25 | 北京冶科磁性材料有限公司 | Heat treatment method for low-loss and medium and high-frequency iron-based nanocrystalline transformer iron cores |
| CN104775014A (en) * | 2015-04-27 | 2015-07-15 | 贵州鑫湄纳米科技有限公司 | Heat treatment method of amorphous/microcrystalline iron-base magnetic cores |
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