CN117877837A - Method for improving magnetic performance of manganese-zinc ferrite based on electromagnetic coupling treatment - Google Patents
Method for improving magnetic performance of manganese-zinc ferrite based on electromagnetic coupling treatment Download PDFInfo
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- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 230000008878 coupling Effects 0.000 title claims abstract description 77
- 238000010168 coupling process Methods 0.000 title claims abstract description 77
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 77
- 238000011282 treatment Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 title claims abstract description 34
- 230000005684 electric field Effects 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 28
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000011701 zinc Substances 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 13
- 230000035699 permeability Effects 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 9
- 230000006872 improvement Effects 0.000 claims description 6
- 238000001878 scanning electron micrograph Methods 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 5
- 238000011056 performance test Methods 0.000 claims description 4
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- 238000007599 discharging Methods 0.000 claims description 3
- 238000004626 scanning electron microscopy Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 16
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- 239000011162 core material Substances 0.000 description 68
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 4
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- 230000001808 coupling effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005381 magnetic domain Effects 0.000 description 3
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- 238000005245 sintering Methods 0.000 description 3
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- 238000005265 energy consumption Methods 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
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- H01F1/0315—Ferrites
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Abstract
The invention discloses a method for improving the magnetic performance of manganese-zinc ferrite based on electromagnetic coupling treatment, which comprises the steps of selecting and treating the number of manganese-zinc ferrite magnetic core parts; determining the clamping direction of the manganese-zinc ferrite core part during processing; setting a coupling mode of electromagnetic coupling treatment of the manganese-zinc ferrite core part; determining parameters of a pulsed electric field and a pulsed magnetic field; and carrying out electromagnetic coupling treatment on the manganese-zinc ferrite magnetic core part. The electromagnetic coupling treatment technology adopted by the invention has the characteristics of high efficiency, cleanness and safety, and the macroscopic size of the part is not changed in the treatment process. The electromagnetic coupling treatment can generate a high-strength magnetic field and an electric field, so that the surface of the Mn-Zn ferrite material generates high-density current, a nanoscale action effect is formed on the surface of the material, the microstructure defect of the part is repaired, and the residual stress in the processing and manufacturing process is homogenized, so that the magnetic performance of the part is effectively improved.
Description
Technical Field
The invention belongs to the technical field of magnetic property improvement of soft magnetic ferrite parts, and particularly relates to a method for improving magnetic property of manganese zinc ferrite based on electromagnetic coupling treatment.
Background
At present, the continuous integration of informatization and industrialization, along with the rapid development of emerging industries such as 5G communication, high-speed computing, new energy automobiles, artificial intelligence and the like, the fields such as electronic power, mobile communication and the like are promoted to be continuously upgraded, and simultaneously, higher requirements are also put forward on core part processing technology and key performance improving technology of electronic components. The magnetic element prepared by the manganese-zinc ferrite material has good magnetic property and high impedance property, and is widely applied to electronic circuits. Under the drive of market demands, electronic components develop to high stability, high reliability, wide adaptability and the like, and higher performance requirements such as high magnetic permeability, low loss, low coercivity and the like are also provided for manganese zinc ferrite parts. Therefore, various magnetic properties of the manganese-zinc ferrite part are improved, the ever-increasing market demands are met, and the manganese-zinc ferrite part has important practical significance and profound application prospect. The existing manganese zinc ferrite magnetic property improvement technology can be summarized into a plurality of modes such as changing doping substances, changing sintering temperature and heat preservation time, changing sintering mode and the like, and the technology plays a role in the manufacturing process, has longer manufacturing period and higher cost, and often involves the change of production procedures, consumes energy and is not easy to adjust.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for improving the magnetic performance of a manganese-zinc ferrite based on electromagnetic coupling treatment, so as to solve the problems that the conventional manganese-zinc ferrite magnetic performance improvement technology is long in manufacturing period, high in cost, and difficult to adjust, and energy is consumed due to the change of production procedures.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for improving magnetic performance of Mn-Zn ferrite based on electromagnetic coupling treatment comprises the following steps:
s1, selecting and processing the number of manganese-zinc ferrite magnetic core parts according to a magnetic line path;
s2, determining the clamping direction of the manganese-zinc ferrite core part during processing according to the use of the manganese-zinc ferrite core part and the winding direction of the magnetizing magnetic field during testing;
s3, setting a coupling mode of electromagnetic coupling treatment of the manganese-zinc ferrite core part;
s4, determining parameters of a pulse electric field and a pulse magnetic field according to the cross-sectional area and the grain size of the manganese-zinc ferrite magnetic core part;
s5, carrying out electromagnetic coupling treatment on the manganese-zinc ferrite core part based on the determined parameters of the pulse electric field and the pulse magnetic field, and carrying out magnetic performance test on the manganese-zinc ferrite core part after treatment, wherein if the initial permeability, the power loss and the coercive force of the manganese-zinc ferrite core part all reach preset values, the improvement is finished; otherwise, repeating the steps S1 to S4 until the data of the initial magnetic permeability, the power loss and the coercive force all reach preset values.
Further, the step S1 specifically includes:
if the manganese-zinc ferrite core part is an open magnetic core, selecting a single manganese-zinc ferrite core part for treatment;
if the manganese-zinc ferrite core part is a closed-circuit core, two manganese-zinc ferrite core parts are selected for combination treatment.
Further, in step S2, after the manganese-zinc ferrite core part is clamped, the winding direction of the electromagnetic coupling processing magnetic field is consistent with the winding direction of the magnetizing magnetic field when the manganese-zinc ferrite core part is used and tested, and the manganese-zinc ferrite core part is placed in the center of the electromagnetic coupling processing cavity.
Further, the coupling mode of the electromagnetic coupling processing in step S3 is as follows: four pulse electric field discharges are coupled in one pulse magnetic field, and the current directions of four electric pulses are positive and negative alternately.
Further, when the magnetic field coil finishes one-time charging and discharging, four pulse currents are sequentially applied to the manganese-zinc ferrite magnetic core part; the first pulse current and the third pulse current are in the forward direction, and the second pulse current and the fourth pulse current are in the reverse alternating process according to the discharge sequence.
Further, the parameters of the pulsed magnetic field in step S4 include: magnetic field B, number of magnetizing times n Magnetic field Time of magnetic field action T Magnetic field And magnetizing interval time T Magnetic room ；
Parameters of the pulsed electric field include: current magnitude I, single group pulse current number n Electric power Time interval t of single pulse current Electric room Current density J and single pulse current discharge time t Electric power 。
Further, the magnetic field B is 1.5T, and the magnetic field action time T Magnetic field 20ms, magnetizing interval time T Magnetic room 15ms, single group pulse current number n Electric power 4, the interval time T between two adjacent pulse currents in each group of electromagnetic coupling treatment Electric room Current density j=20a/mm=4 ms 2 Single pulse current discharge time t Electric power 1ms.
Further, the action time of the single-group electric field is T Electric power ：
T Electric power ＝n Magnetic field *t Electric room +n Magnetic field *t Electric power
Total time T of electromagnetic coupling treatment Total (S) ：
T Total (S) ＝n Magnetic field *T Magnetic field +(n Magnetic field -1)*T Magnetic room 。
Further, the current I of the electromagnetic coupling treatment is determined according to the sectional area of the manganese-zinc ferrite core part, and is as follows:
I＝∫JdS
wherein S is the effective cross-sectional area of the Mn-Zn ferrite core part.
Further, scanning electron microscopy is adopted to shoot SEM images of the manganese-zinc ferrite core part, a sectional line method is used for measuring 20 grain sizes in the SEM images, an average value of the 20 grain sizes is taken as the average grain size of the manganese-zinc ferrite core part, and magnetizing times are adjusted according to the average grain size:
if averageGrain size<At 3 μm, the magnetizing times n Magnetic field =5 times
If 3 μm<Average grain size<6 μm, the magnetizing times n Magnetic field =15 times
If the average grain size is>6 μm, the magnetizing times n Magnetic field =20 times.
The method for improving the magnetic performance of the Mn-Zn ferrite based on electromagnetic coupling treatment has the following beneficial effects:
1. according to the invention, the processing parameters are set according to the characteristics of the manganese zinc ferrite part, so that the coupled energy of the magnetic field and the electric field can improve the performance of the material on the basis of not changing the macroscopic size and the shape of the part, promote the progress of hollow defects and atomic diffusion behaviors in the material, relax peak stress and homogenize residual stress generated in the processing and manufacturing processes; meanwhile, the movement of a dislocation source is activated, the dislocation density is increased, the displacement of the domain wall of the material is promoted, the dislocation density caused by the dislocation movement is prevented from being further increased, and the generated hardening is further improved, so that the resistance of the reversible magnetic domain displacement and rotation of the material in the magnetizing process is effectively reduced, the magnetic permeability of the material is improved, the coercive force is reduced, and the power loss in the using process is further reduced.
2. The invention reduces the power loss and coercive force while improving the initial magnetic permeability, improves the energy conversion efficiency of the Mn-Zn ferrite core in equipment such as transformers, inductors and the like, and further reduces the energy consumption and the energy loss. Compared with the traditional method with complex procedures, difficult control, energy consumption and high cost, such as changing doping substances, changing sintering process and the like, the invention provides an efficient, clean and green magnetic performance improving method for the soft magnetic material manufacturing industry. Meanwhile, the improvement of the magnetic performance of the manganese zinc ferrite part is also helpful to promote the development and innovation of electronic equipment such as a high-frequency transformer, a filter, a sensor and the like, and can reduce energy loss and environmental pollution, which also accords with the strategy of national sustainable development.
3. The electromagnetic field parameters set by the invention have better coupling effect in the treatment process and more obvious effect on improving the magnetic performance of the manganese-zinc ferrite part. Compared with the traditional magnetic performance improving process, the electromagnetic coupling treatment technology adopted by the invention has the characteristics of high efficiency, cleanness and safety, and the macroscopic size of the part is not changed in the treatment process. By electromagnetic coupling treatment, a high-strength magnetic field and an electric field can be generated, so that high-density current is generated on the surface of the manganese-zinc ferrite material, a nanoscale action effect is formed on the surface of the material, the microstructure defect of the part is improved, and the residual stress in the processing and manufacturing process is homogenized, so that the magnetic performance of the part is effectively improved.
4. The invention adopts a single treatment mode aiming at the open-circuit magnetic core, and adopts a pairing treatment mode for the closed-circuit magnetic core, so that the treatment working condition is ensured to be the same as the use and test working conditions. The mode of coupling positive and negative alternate pulse currents in four current directions by adopting one pulse magnetic field is adopted, so that the space-time coupling effect of the electromagnetic field is better; the current of the treatment is changed according to the effective sectional area of the part, so that the purpose of controlling the current density to be the same is achieved, the part is ensured to be treated under the optimal treatment process, and the magnetic performance of the part is further ensured to be improved.
Drawings
FIG. 1 is a flow chart of a method for improving magnetic properties of Mn-Zn ferrite based on electromagnetic coupling treatment.
Fig. 2 is an electric field and magnetic field action diagram of a method for improving magnetic properties of manganese-zinc ferrite based on electromagnetic coupling treatment.
FIG. 3 shows the handling and clamping of EP-13 core in example 2.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Example 1, this example shows a Mn-Zn-Fe alloy based on electromagnetic coupling treatmentThe method for improving the magnetic performance of the oxygen body is based on the electromagnetic coupling technology, and the manganese-zinc ferrite magnetic core part is processed by controlling the coupling mode and parameters of an electric field and a magnetic field to improve the initial permeability mu of the manganese-zinc ferrite magnetic core part i The magnetic properties such as power loss Pc, coercive force Hc and the like specifically comprise the following steps:
step S1, selecting and processing the number of manganese-zinc ferrite magnetic core parts according to the path of magnetic lines of force, wherein the method specifically comprises the following steps:
manganese-zinc ferrite cores can be roughly classified into two main categories according to the path of magnetic lines:
the first type is an open magnetic core, and if the manganese-zinc ferrite magnetic core part is an open magnetic core, a single manganese-zinc ferrite magnetic core part is selected for treatment;
the magnetic path of such cores is open (open magnetic circuits) and the magnetic flux passing through the core passes through the surrounding space (air gap) to form a closed magnetic path. The air gap of the open magnetic core occupies a considerable part of the total length of the magnetic circuit, the magnetic resistance is large, and part of the magnetic flux in the magnetic circuit leaves the magnetic core to form leakage magnetic flux before reaching the air gap. Thus, the open core is characterized by unequal flux in each section of the magnetic circuit. Because of the large air gap of the open magnetic core, the magnetic circuit is subjected to demagnetizing, so that the effective magnetic permeability mu of the magnetic core is reduced from that of the material to a degree determined by the geometry and size of the magnetic core. Therefore, when electromagnetic coupling treatment is carried out, single treatment is selected, and a single part is directly clamped between two electrode heads.
The second type of core is a closed-circuit core such that the magnetic circuit is closed (closed magnetic circuits), or substantially closed, and IEC 1332 standard refers to a closed-circuit core as a CL type core; if the manganese-zinc ferrite core parts are closed-circuit cores, selecting two manganese-zinc ferrite core parts for combination treatment;
the core with a completely closed magnetic circuit is most typically a toroidal core, in addition to a double-hole core, a porous core, etc. The closed magnetic core which is produced and used in large quantity at present is a combined closed magnetic circuit magnetic core, and the closed magnetic circuit can be formed only after two magnetic cores with the same shape and size or different shape and size are matched, and the closed magnetic core is an EE magnetic core, a UU magnetic core or an EI magnetic core, an UI magnetic core and an EP magnetic core. An air gap may exist between contact surfaces of the magnetic cores, and the magnetic circuit is not necessarily completely closed after combination, so that the effective magnetic permeability of the combined closed-circuit magnetic core is basically equal to the magnetic permeability of the magnetic core material, but not completely equal to the magnetic permeability of the magnetic core material, and the closed-circuit magnetic cores are matched for use in the use process and the test process, so that the matching treatment is selected when the electromagnetic coupling treatment is carried out, the magnetic circuit line is closed, and the treatment effect is ensured.
Step S2, determining the clamping direction of the manganese-zinc ferrite core part during processing according to the winding direction of the magnetizing magnetic field during testing and the use of the manganese-zinc ferrite core part, wherein the method specifically comprises the following steps:
after the manganese-zinc ferrite core part is clamped, the winding direction of the electromagnetic coupling treatment magnetic field is consistent with the winding direction of the magnetizing magnetic field when the manganese-zinc ferrite core part is used and tested, and the manganese-zinc ferrite core part is placed in the center of the electromagnetic coupling treatment cavity.
Specifically, an electromagnetic coupling processing device is started, and the electromagnetic coupling processing device directly adopts the prior art; after the two copper electrodes placed coaxially are retracted to the two ends, clamping a single part or a single group of parts to be processed in the center of the processing cavity by using a clamp, starting the motor to enable the two motors to move towards the center, and clamping the parts to be processed in the center of the processing cavity by controlling the clamping force of the section; and after clamping, withdrawing the clamp, and controlling the two magnetic field coils to move to the center of the treatment cavity.
Because the manganese-zinc ferrite core part all need use different wire winding directions according to different models in the use, so need control part centre gripping's direction when electromagnetic coupling handles, the magnetic field coil wire winding direction that lets electromagnetic coupling processing equipment and manganese-zinc ferrite core part use the wire winding direction keep unanimous to guarantee the treatment effect of pulse magnetic field.
S3, setting a coupling mode of electromagnetic coupling treatment of the manganese-zinc ferrite core part;
the electromagnetic coupling mode is controlled to be a mode of coupling four pulse electric fields by a pulse magnetic field, and four pulse currents are sequentially applied to the part to be processed while the magnetic field coil finishes one-time charging and discharging. The first pulse current and the third pulse current are in the forward direction, and the second pulse current and the fourth pulse current are in the reverse alternating process according to the discharge sequence.
Namely, the electric field processing time is controlled to be consistent with the magnetic field processing time by controlling and adjusting the interval time between single pulse electric fields, and the total number of coupling processing is controlled by controlling the magnetizing times.
S4, determining parameters of a pulse electric field and a pulse magnetic field according to the cross-sectional area and the grain size of the manganese-zinc ferrite magnetic core part, wherein the parameters specifically comprise the following contents:
parameters of the pulsed magnetic field include: magnetic field B, number of magnetizing times n Magnetic field Time of magnetic field action T Magnetic field And magnetizing interval time T Magnetic room ；
Parameters of the pulsed electric field include: current magnitude I, single group pulse current number n Electric power Time interval t of single pulse current Electric room Current density J and single pulse current discharge time t Electric power 。
In the present embodiment, the following parameters are not changed in size:
the magnetic field B is 1.5T, and the magnetic field action time T Magnetic field 20ms, magnetizing interval time T Magnetic room 15ms, single group pulse current number n Electric power 4, the interval time T between two adjacent pulse currents in each group of electromagnetic coupling treatment Electric room Current density j=20a/mm=4 ms 2 Single pulse current discharge time t Electric power 1ms.
Interval time T of magnetizing Magnetic room Discharge time t of a single pulse current for the interval between two pulsed magnetic fields Electric power The length is determined by the power and control system of the equipment and is a fixed value T Magnetic room ＝15ms,t Electric power =1 ms; while single pulse current interval time t Electric room Is the interval between two adjacent pulse currents in one electromagnetic coupling, and the time T of the action of a single group of electric fields is controlled by adjusting the interval time Electric power 。
The embodiment is solidThe purpose of the above parameters is to control the time of the electric field to coincide with the time of the magnetic field, and to ensure the coupling effect of the electromagnetic field, a current interval time t is passed after the magnetic field is started Electric room The first current then begins to discharge.
Referring to fig. 2, after a current interval has elapsed after the magnetic field begins to process, the first current begins to act and the magnetic field and electric field are not simultaneously released.
Single set of magnetic field time T Magnetic field ＝20ms
Single set of electric field application time T Electric power ＝n Magnetic field *t Electric room +n Magnetic field *t Electric power ＝20ms
Total time T of electromagnetic coupling treatment Total (S) ＝n Magnetic field *T Magnetic field +(n Magnetic field -1)*T Magnetic room
In order to control the same pulse current density acted on the parts during electromagnetic coupling treatment, the invention changes the pulse current according to the effective sectional areas of the parts with different sizes and models to control the current density to be unchanged.
Specifically, the current is adjusted according to the effective sectional areas (S) of different parts:
I＝∫JdS
wherein I is the current magnitude of electromagnetic coupling treatment, S is the effective sectional area of the Mn-Zn ferrite part, and J is the current density.
Before electromagnetic coupling treatment, a Scanning Electron Microscope (SEM) is adopted to shoot SEM images of parts to be detected, a sectional line method (the current method for measuring the grain size of the soft magnetic ferrite material by utilizing the SEM images is to fixedly seal and grind the parts), then a straight line is drawn on a polished section at will, the length of the straight line is measured by adopting the microscope, then the number of grain boundaries intersected with the straight line is counted, the grain size is obtained by calculation), 20 grain sizes are measured, an average value is taken as the average grain size of the manganese zinc ferrite parts, the magnetizing times are adjusted according to the grain size of the parts, namely the group number of electromagnetic coupling treatment is adjusted:
if the average grain size is<At 3 μm, the magnetizing times n Magnetic field ＝5Secondary times;
if 3 μm<Average grain size<6 μm, the magnetizing times n Magnetic field =15 times;
if the average grain size is>6 μm, the magnetizing times n Magnetic field =20 times;
the grain size of the Mn-Zn ferrite material affects the initial permeability mu i Important factors of magnetic properties such as power loss Pc and coercive force Hc. The grain size of the Mn-Zn ferrite is generally between 1 mu m and 10 mu m, the coercive force and the saturation magnetization of the bulk Mn-Zn ferrite with different grain sizes are different, the larger the grain crystallization is, the more uniform the size is, the more regular the shape is, the more complete the grain crystallization is, the larger the average axial ratio is, the more uniform the size is, and the more regular the shape is. According to the characteristic of the soft magnetic material, the magnetization of the Mn-Zn ferrite is expressed as domain wall displacement and magnetic domain (moment) rotation process, so that when the grain growth is more uniform, the pores in the grain are reduced, the resistance of the domain wall displacement and the magnetic domain rotation process can be reduced, and the initial permeability of the ferrite is improved. It has been found through experimentation that ferrite materials with smaller grain sizes have higher hysteresis losses than materials with larger grain sizes, but the former has lower eddy current losses at high frequencies than the latter, so that fewer magnetizing times are selected when the grains are smaller and more magnetizing times are selected when the grains are larger.
S5, carrying out electromagnetic coupling treatment on the manganese-zinc ferrite core part based on the determined parameters of the pulse electric field and the pulse magnetic field, and carrying out magnetic performance test on the manganese-zinc ferrite core part after treatment, if the initial permeability, the power loss and the coercive force of the manganese-zinc ferrite core part all reach preset values, ending; otherwise, repeating the steps S1 to S4 until the data of the initial magnetic permeability, the power loss and the coercive force all reach preset values.
Example 2
In this embodiment, the performance of the EP-13 type manganese-zinc-ferrite core is improved by the method in embodiment 1, which specifically includes the following steps:
step T1, referring to FIG. 3, since the EP type magnetic core is a closed magnetic core, a processing mode of combining two magnetic cores is adopted;
the EP-shaped magnetic core is derived from the E-shaped magnetic core and the pot-shaped magnetic core, is a smart combination of the advantages of the E-shaped magnetic core that the post-process operation is simple and the advantages of the shielding effect of the pot-shaped magnetic core, and is named as the EP-shaped magnetic core, thus being most suitable for designing a small-sized inductor and a high-performance transformer.
Taking an E-shaped magnetic core as an example, magnetic force lines of the E-shaped magnetic core start from the middle magnetic core, are on the left and right sides, and then reach the other side of the middle magnetic core. Therefore, when EP13 is processed, two magnetic core combination processing modes are selected, a special clamp is used for clamping, the air gap of contact between parts is reduced as much as possible, and the combined magnetic circuit is closed as much as possible.
And step T2, referring to FIG. 3, placing the combined EP-13 type part in the center of the electromagnetic coupling treatment cavity according to the principle that the winding direction of the treatment magnetic field is consistent with the winding direction of the magnetization magnetic field in use, and clamping the part between two electrodes.
When the EP-13 type Mn-Zn ferrite core is used for performance test and encapsulation, the magnetic field wire is wound around the central cylindrical structure of the core, and the direction of the generated magnetic field is along the axial direction of the cylinder, so that two cylindrical end faces are selected for clamping during clamping, and the direction of the pulse magnetic field is kept consistent with that of the pulse magnetic field.
Step T3, setting a coupling mode of electromagnetic coupling treatment of the manganese-zinc ferrite core part;
specifically, four pulse electric field discharges are coupled in a pulse magnetic field, and the current directions of four electric pulses are alternately positive and negative.
Sequentially naming four pulse currents as first to fourth currents according to the sequence of discharge time, wherein the first current and the third current are consistent in direction and are all forward; the current directions of the second and fourth electrodes are consistent and reverse.
Step T4, determining parameters of a pulse electric field and a pulse magnetic field according to the cross-sectional area and the grain size of the manganese-zinc ferrite magnetic core part;
wherein the parameters of the pulsed magnetic field comprise: the magnetic field size (B), the magnetizing frequency (n) Magnetic field ) Time of magnetic field action (T) Magnetic field ) Interval of magnetizingTime (T) Magnetic room )；
The parameters of the pulsed electric field include: current magnitude (I), number of pulse current of single group (n) Electric power ) Single pulse current interval (T) Electric room ) Current density (J);
magnetic field magnitude b=1.5t, current density j=20a/mm 2 Time of magnetic field action T Magnetic field Time between magnetizing of =20ms Magnetic room Number of pulse currents in single group n =15 s Electric power =4, single pulse current interval time T Electric room ＝5ms。
The effective cross-sectional area of the EP-13 type Mn-Zn ferrite core is S20 mm 2 Therefore:
I＝∫JdS
in this embodiment, substituting the current density into the formula may result in:
I＝∫20dS＝400A
the current magnitude i=400A is calculated, and thus the pulse current magnitude is set to 400A.
The average grain size of the manganese zinc ferrite material used was 5 μm, so the number of magnetizing times was set to 15.
Thereby calculating the total part processing time length of each group:
T total (S) ＝n Magnetic field *T Magnetic field +(n Magnetic field -1)*T Magnetic room
In this embodiment, substituting the electromagnetic field parameters into the formula yields:
T total (S) ＝15*0.02+(15-1)*15＝210.3s
After all electromagnetic coupling processing parameters are determined, starting electromagnetic coupling processing equipment to process the EP-13 type manganese zinc ferrite part.
Step T5, testing the magnetic performance of the processed EP-13 type manganese zinc ferrite part, and respectively detecting the initial magnetic permeability mu under two test conditions according to the detection standard during the manufacturing of the part i Magnetic performance data of three items, namely power loss Pc, coercive force Hc and the like.
Test conditions:
the temperature is 25 ℃, the magnetic field is 200mT, and the frequency is 200kHz
The temperature is 100 ℃, the magnetic field is 200mT, the frequency is 200kHz, and the test results are shown in the following table:
TABLE 1 results of 25℃test at temperature
TABLE 2 results of 100℃test at temperature
As can be seen from tables 1 and 2, the magnetic properties of the EP-13 type Mn-Zn ferrite parts are obviously improved after the electromagnetic coupling treatment technology of the method is adopted. After treatment, the initial magnetic permeability is improved by more than ten percent at 25 ℃ and 100 ℃, wherein the initial magnetic permeability is improved by 17.3 percent under the conditions of 25 ℃, a magnetic field of 200mT and a frequency of 200 kHz; the power loss and the coercive force of the magnetic field are obviously reduced, the power loss is reduced by 13.7% under the conditions of 100 ℃ and 200mT magnetic field frequency and 200kHz frequency, and the coercive force is reduced by 12.2%.
Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, it should not be construed as limiting the scope of protection of the present patent. Various modifications and variations which may be made by those skilled in the art without the creative effort are within the scope of the patent described in the claims.
Claims (10)
1. The method for improving the magnetic performance of the Mn-Zn ferrite based on electromagnetic coupling treatment is characterized by comprising the following steps of:
s1, selecting and processing the number of manganese-zinc ferrite magnetic core parts according to a magnetic line path;
s2, determining the clamping direction of the manganese-zinc ferrite core part during processing according to the use of the manganese-zinc ferrite core part and the winding direction of the magnetizing magnetic field during testing;
s3, setting a coupling mode of electromagnetic coupling treatment of the manganese-zinc ferrite core part;
s4, determining parameters of a pulse electric field and a pulse magnetic field according to the cross-sectional area and the grain size of the manganese-zinc ferrite magnetic core part;
s5, carrying out electromagnetic coupling treatment on the manganese-zinc ferrite core part based on the determined parameters of the pulse electric field and the pulse magnetic field, and carrying out magnetic performance test on the manganese-zinc ferrite core part after treatment, wherein if the initial permeability, the power loss and the coercive force of the manganese-zinc ferrite core part all reach preset values, the improvement is finished; otherwise, repeating the steps S1 to S4 until the data of the initial magnetic permeability, the power loss and the coercive force all reach preset values.
2. The method for improving magnetic properties of manganese-zinc-ferrite based on electromagnetic coupling treatment according to claim 1, wherein the step S1 specifically comprises:
if the manganese-zinc ferrite core part is an open magnetic core, selecting a single manganese-zinc ferrite core part for treatment;
if the manganese-zinc ferrite core part is a closed-circuit core, two manganese-zinc ferrite core parts are selected for combination treatment.
3. The method for improving magnetic performance of manganese-zinc ferrite based on electromagnetic coupling treatment according to claim 1, wherein in the step S2, after the manganese-zinc ferrite core part is clamped, the winding direction of the electromagnetic coupling treatment magnetic field is consistent with the winding direction of the magnetizing magnetic field when the manganese-zinc ferrite core part is used and tested, and the manganese-zinc ferrite core part is placed in the center of the electromagnetic coupling treatment cavity.
4. The method for improving magnetic properties of manganese-zinc ferrite based on electromagnetic coupling treatment according to claim 1, wherein the coupling mode of the electromagnetic coupling treatment in step S3 is as follows: four pulse electric field discharges are coupled in one pulse magnetic field, and the current directions of four electric pulses are positive and negative alternately.
5. The method for improving the magnetic performance of the manganese-zinc ferrite based on the electromagnetic coupling treatment according to claim 4, wherein the method comprises the following steps: when the magnetic field coil finishes one-time charging and discharging, four pulse currents are sequentially applied to the manganese-zinc ferrite magnetic core part; the first pulse current and the third pulse current are in the forward direction, and the second pulse current and the fourth pulse current are in the reverse alternating process according to the discharge sequence.
6. The method for improving magnetic properties of manganese-zinc-ferrite based on electromagnetic coupling treatment according to claim 5, wherein the parameters of the pulsed magnetic field in step S4 include: magnetic field B, number of magnetizing times n Magnetic field Time of magnetic field action T Magnetic field And magnetizing interval time T Magnetic room ；
Parameters of the pulsed electric field include: current magnitude I, single group pulse current number n Electric power Time interval t of single pulse current Electric room Current density J and single pulse current discharge time t Electric power 。
7. The method for improving the magnetic performance of the manganese-zinc ferrite based on the electromagnetic coupling treatment according to claim 6, wherein the method comprises the following steps: the magnetic field B is 1.5T, and the magnetic field action time T Magnetic field 20ms, magnetizing interval time T Magnetic room 15ms, single group pulse current number n Electric power 4, the interval time T between two adjacent pulse currents in each group of electromagnetic coupling treatment Electric room Current density j=20a/mm=4 ms 2 Single pulse current discharge time t Electric power 1ms.
8. The method for improving magnetic properties of Mn-Zn ferrite based on electromagnetic coupling treatment according to claim 6, wherein the single set of electric fields has a duration T Electric power ：
T Electric power ＝n Magnetic field *t Electric room +n Magnetic field *t Electric power
Total time T of electromagnetic coupling treatment Total (S) ：
T Total (S) ＝n Magnetic field *T Magnetic field +(n Magnetic field -1)*T Magnetic room 。
9. The method for improving magnetic properties of manganese-zinc-ferrite based on electromagnetic coupling treatment according to claim 7, wherein the current I of the electromagnetic coupling treatment is determined according to the sectional area of the manganese-zinc-ferrite core part as follows:
I＝∫JdS
wherein S is the effective cross-sectional area of the Mn-Zn ferrite core part.
10. The method for improving magnetic properties of manganese-zinc-ferrite based on electromagnetic coupling treatment according to claim 7, wherein scanning electron microscopy is used to shoot SEM images of manganese-zinc-ferrite core parts, 20 grain sizes are measured in the SEM images by a truncated wire method, an average value of the 20 grain sizes is taken as an average grain size of the manganese-zinc-ferrite core parts, and magnetizing times are adjusted according to the average grain size:
if the average grain size is less than 3 μm, the number of magnetizing times n Magnetic field =5 times
If 3 μm < average grain size < 6 μm, the number of magnetizing times n Magnetic field =15 times
If the average grain size is more than 6 μm, the number of magnetizing times n Magnetic field =20 times.
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