CN114628144B - I-type nanocrystalline magnetic core and preparation method thereof - Google Patents
I-type nanocrystalline magnetic core and preparation method thereof Download PDFInfo
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- CN114628144B CN114628144B CN202210389543.1A CN202210389543A CN114628144B CN 114628144 B CN114628144 B CN 114628144B CN 202210389543 A CN202210389543 A CN 202210389543A CN 114628144 B CN114628144 B CN 114628144B
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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)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
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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
- H01F41/005—Impregnating or encapsulating
Abstract
The invention discloses an I-type nanocrystalline magnetic core and a preparation method thereof, and the specific preparation process comprises the following steps: coiling a nanocrystalline strip into an annular magnetic core, shaping and die-filling the annular magnetic core, carrying out magnetic core heat treatment, detecting the inductance performance of the magnetic core, sucking matched glue in a vacuum negative pressure mode, baking and curing in a baking oven, cutting and shaping, and carrying out protective epoxy spraying, thereby obtaining the required finished product I-type nanocrystalline magnetic core. The process method can effectively and conveniently solve the problem of complex performance test of the strip-shaped magnetic core, can realize hundred percent total detection, ensures that all the magnetic cores have required performance, and obviously improves the qualification rate of the magnetic cores. Compared with the traditional interlayer stacking preparation process, the invention improves the production efficiency, the dimensional accuracy consistency and the performance qualification rate and reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of magnetic core preparation, and particularly relates to an I-type nanocrystalline magnetic core and a preparation method thereof.
Background
The iron-based amorphous nanocrystalline strip serving as a new material has the characteristics of high magnetic saturation, high magnetic conductivity, high Curie temperature, high temperature stability, low loss and the like, and is used as an important component of an inductor, a reactor, a magnetic separation sheet and the like to be applied to the fields of electric power systems, new energy automobile systems, electronic components and the like; however, because the nanocrystalline strip is brittle and fragile after heat treatment, the traditional I-shaped magnetic core is formed by overlapping the strip layers, the performance detection operation is complicated, and the production efficiency is low.
Disclosure of Invention
Aiming at the problems, the invention provides an I-type nanocrystalline magnetic core and a preparation method thereof, which solve the technical problems of brittleness, fragility, complex performance detection operation, low production efficiency and the like of the traditional nanocrystalline strip after heat treatment.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of an I-type nanocrystalline magnetic core comprises the following steps:
s1: winding the nanocrystalline strip into an annular magnetic core by using a winding machine;
s2: the annular magnetic core in the S1 is clamped and flattened by a clamping plate to form a strip-shaped magnetic core, a testing air gap is reserved, a limiting block is embedded to control the thickness of the clamping, and the flattened strip-shaped magnetic core, the clamping plate and the limiting block are arranged in a die to be limited and fastened;
s3: putting the mould and the strip-shaped magnetic core in the step S2 into an atmosphere integrated protective furnace for heat treatment, so that the strip-shaped magnetic core in the mould is crystallized, shaped and stress is eliminated;
s4, taking the mold and the strip-shaped magnetic core out of the atmosphere integrated protective furnace after heat treatment, and testing the inductance of the strip-shaped magnetic core;
s5: preparing curing glue, uniformly coating the curing glue on the end face of the strip-shaped magnetic core, putting the curing glue and the mould into a vacuumizing machine together for vacuumizing to 0.1MP, and enabling the glue to be uniformly sucked into the interlayer gap of the strip-shaped magnetic core;
s6: placing the die and the strip-shaped magnetic core in the baking oven for baking and curing;
s7: taking the die and the strip-shaped magnetic core in the step S6 out of the baking oven, and unloading the die to obtain the solidified strip-shaped magnetic core;
s8: cutting the strip-shaped magnetic core obtained in the step S7 to a required external dimension through a machining line to obtain a semi-finished product I-type nanocrystalline magnetic core;
s9: and (5) performing protective epoxy resin spraying on the appearance of the semi-finished product I type nanocrystalline magnetic core obtained in the step (S8) to obtain the finished product I type nanocrystalline magnetic core.
Further, the nanocrystalline strip is a 1K107B iron-based nanocrystalline strip.
As a further technical solution, the heat treatment in step S3 includes the following steps: (1) Rapidly heating the temperature in the atmosphere integrated protection furnace to 400 ℃, then heating to 450-480 ℃ at the speed of 50-65 ℃/h, and filling nitrogen for protection and heat preservation for 1-2 hours; (2) Heating to 550-580 ℃ at the temperature of 45-60 ℃/h, preserving the heat for 1-2 h, and simultaneously starting a transverse magnetic field to induce magnetic core grains to enable the magnetic core to have an anti-stress effect; (3) And (4) rapidly cooling to 200-250 ℃ at the speed of 150 ℃/hour, closing the nitrogen protection, closing the transverse magnetic field, cooling, and taking out the mold and the strip-shaped magnetic core.
As a further technical scheme, in the step S4, the inductance of the strip-shaped magnetic core is tested by an IM3536 LCR tester.
As a further technical scheme, the method for testing the inductance of the strip-shaped magnetic core is that a copper wire penetrates through a reserved air gap formed in the strip-shaped magnetic core in the step S2 and is connected with the anode and the cathode of an IM3536 LCR tester to form a loop, and the inductance of the strip-shaped magnetic core is obtained through testing.
As a further technical scheme, the glue in the step S5 is double-component high-temperature curing epoxy glue, and is uniformly coated on the surface of the strip-shaped magnetic core, and then the surface of the strip-shaped magnetic core is vacuumized to negative pressure of-0.1 MPa by a vacuumizing machine, so that the glue can uniformly penetrate between strip layers of the strip-shaped magnetic core.
As a further technical scheme, in the step S6, the baking and curing temperature is 120-150 ℃ and the time is 1.5-2h, and the curing of the strip-shaped magnetic core is completed through baking.
As a further technical scheme, the thickness of the protective epoxy resin sprayed in the step S9 is 0.2-0.3mm, so that the outer layer peeling phenomenon of the I-type nanocrystalline magnetic core caused by the brittleness of the material is protected;
a type I nanocrystalline magnetic core is prepared by the method, and the thickness direction of the core is formed by stacking 16-20 mu m nanocrystalline strips.
By the technical scheme, the problem of complex performance test of the strip-shaped magnetic core can be effectively and conveniently solved, hundreds of complete detection can be realized, all the magnetic cores are ensured to have required performance, and the qualification rate of the magnetic cores is remarkably improved. The outer layer peeling phenomenon of the I-type nanocrystalline magnetic core caused by the brittleness of the material is protected by the sprayed protective epoxy resin; in addition, compared with the traditional interlayer stacking preparation process, the invention improves the production efficiency, the consistency of the dimensional precision and the performance qualification rate and reduces the production cost.
Drawings
FIG. 1 is a schematic diagram of a type I nanocrystalline core structure according to the present invention;
FIG. 2 is a schematic structural diagram of a mold required for producing the I-type nanocrystalline magnetic core and after the mold filling is completed;
in the figure: 1. a mold; 2. a limiting block; 3. a splint; 4. a strip-shaped magnetic core.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in FIG. 1, an I-type nanocrystalline magnetic core is formed by stacking 16 μm nanocrystalline strips in the thickness direction, is coated with epoxy resin in a 0.3mm thickness shape for protection, and has a size customized according to customer requirements; the preparation process comprises the following steps:
s1: selecting a 1K107B iron-based nanocrystalline strip, winding the strip into an annular magnetic core with the thickness of 16 mu m by using a winding machine, wherein the wall thickness of the magnetic core is about 1/2 of the thickness of the magnetic core before spraying in the figure 1, namely the thickness of 2 walls of the annular magnetic core after flattening is equal to the thickness of the last square block;
s2: as shown in fig. 2, the annular magnetic core described in S1 is clamped by a clamping plate 3 to form a strip-shaped magnetic core, a testing air gap is reserved, a limiting block 2 is embedded to control the clamping thickness, and the clamped strip-shaped magnetic core 4, the clamping plate 3 and the limiting block 2 are installed in a bottom plate of a mold 1 together for limiting and fastening;
s3: and (3) putting the die and the strip-shaped magnetic core 4 in an atmosphere integrated protective furnace for heat treatment, wherein the steps are as follows: closing the furnace door, rapidly heating to 400 ℃, then increasing the temperature to 480 ℃ according to 55 ℃/h, preserving heat, filling nitrogen, preserving heat for 1 h, performing a stress relief stage, then increasing the temperature to 560 ℃ according to 60 ℃/h, preserving heat for 2h, simultaneously starting a transverse magnetic field to induce magnetic core grains so that the magnetic core has an anti-stress effect, ensuring that the influence on the shape change of the magnetic core is reduced to the minimum after the stress relief shaping, then cooling to 200 ℃ along with the furnace, closing the magnetic field, closing the nitrogen, opening the furnace door, and performing air blowing cooling;
s4: testing inductance by using an IM3536 LCR tester, wherein a test copper wire penetrates through a reserved air gap in the strip-shaped magnetic core 4, and is connected with the anode and the cathode of the tester to form a test loop, so that the performance of detecting the inductance of the strip-shaped magnetic core meets the requirement;
s5: proportioning two-component epoxy AB glue according to a ratio of 1.2, uniformly coating the glue on the surface of the strip-shaped magnetic core 4, putting the glue and a mould into a vacuumizing machine together, and uniformly sucking the glue between strip layers in the strip-shaped magnetic core 4 by using negative pressure of-0.1 MPa;
s6: putting the strip-shaped magnetic core 4 of S5 and the die into a baking oven to be baked for 2 hours at the temperature of 150 ℃;
s7: taking the strip-shaped magnetic core 4 in the step S6 out of the baking oven, and dismantling the die to obtain the completely cured strip-shaped magnetic core 4;
s8: cutting the fully cured strip-shaped magnetic core 4 in the S7 in the length direction by linear cutting to obtain an I-shaped magnetic core which is not sprayed in the figure 1;
s9: spraying an epoxy resin 0.3mm protective layer on the appearance of the I-shaped magnetic core in the step S8 to obtain an I-shaped nanocrystalline magnetic core shown in the figure 1;
example 2
As shown in FIG. 1, a type I nanocrystalline magnetic core is formed by stacking 20 μm nanocrystalline strips in the thickness direction, is protected by spraying epoxy resin with a thickness of 0.2mm, and has a size customized according to the requirements of customers; the specific preparation process is as follows
S1: selecting a 1K107B iron-based nanocrystalline strip, winding the strip into an annular magnetic core with the thickness of 20 mu m by using a winding machine, wherein the wall thickness of the magnetic core is about 1/2 of the thickness before spraying in the figure 1;
s2: as shown in fig. 2, the annular magnetic core described in S1 is clamped by a clamping plate 3 to form a strip-shaped magnetic core, a test air gap is reserved, a limiting block 2 is embedded to control the clamping thickness, and the clamped strip-shaped magnetic core 4, the clamping plate 3 and the limiting block 2 are installed in a bottom plate of a mold 1 together for limiting and fastening;
s3: and S2, placing the die and the strip-shaped magnetic core 4 into an atmosphere integrated protective furnace for heat treatment, wherein the steps are as follows: closing the furnace door, rapidly heating to 400 ℃, then increasing the temperature to 460 ℃ according to 65 ℃/h, preserving heat, filling nitrogen, preserving heat for 2h, performing a stress relief stage, then increasing the temperature to 580 ℃ according to 50 ℃/h, preserving heat for 1 h, simultaneously starting a transverse magnetic field to induce magnetic core grains so that the magnetic core has a stress resistance effect, ensuring that the influence on the shape change of the magnetic core after the stress relief shaping is reduced to the minimum, then cooling to 250 ℃ along with the furnace, closing the magnetic field, closing the nitrogen, opening the furnace door, and performing air blowing cooling;
s4: testing inductance by using an IM3536 LCR tester, wherein a test copper wire penetrates through a reserved air gap in the strip-shaped magnetic core 4, and is connected with the anode and the cathode of the tester to form a test loop, so that the performance of detecting the inductance of the strip-shaped magnetic core meets the requirement;
s5: proportioning two-component epoxy AB glue according to a ratio of 1.2, uniformly coating the glue on the surface of the strip-shaped magnetic core 4, putting the glue and a mould into a vacuumizing machine together, and uniformly sucking the glue between strip layers in the strip-shaped magnetic core 4 by using negative pressure of-0.1 MPa;
s6: putting the strip-shaped magnetic core 4 of S5 and the die into a baking oven to be baked for 2 hours at the temperature of 150 ℃;
s7: taking the strip-shaped magnetic core 4 in the step S6 out of the baking oven, and dismantling the die to obtain the completely cured strip-shaped magnetic core 4;
s8: cutting the fully cured strip-shaped magnetic core 4 in the S7 in the length direction by using linear cutting to obtain an I-shaped magnetic core which is not sprayed in the figure 1;
s9: spraying an epoxy resin 0.2mm protective layer on the appearance of the I-shaped magnetic core in the step S8 to obtain an I-shaped nanocrystalline magnetic core shown in the figure 1;
the relative permeability μ of the nanocrystalline magnetic core that can be prepared by the preparation method of the above embodiment is:
30000-50000@10KHz/0.3V
20000-30000@100KH/0.3V。
Claims (8)
1. a preparation method of an I-type nanocrystalline magnetic core is characterized by comprising the following steps:
s1: winding the nanocrystalline strip into an annular magnetic core by using a winding machine;
s2: the annular magnetic core in the S1 is clamped and flattened by a clamping plate to form a strip-shaped magnetic core, a testing air gap is reserved, a limiting block is embedded to control the thickness of the clamping, and the flattened strip-shaped magnetic core, the clamping plate and the limiting block are arranged in a die to be limited and fastened;
s3: putting the mould and the strip-shaped magnetic core in the step S2 into an atmosphere integrated protective furnace for heat treatment, so that the strip-shaped magnetic core in the mould is crystallized, shaped and stress is eliminated;
s4, taking the mold and the strip-shaped magnetic core out of the atmosphere integrated protection furnace after heat treatment, and testing the inductance of the strip-shaped magnetic core;
s5: preparing curing glue, uniformly coating the curing glue on the end face of the strip-shaped magnetic core, putting the curing glue and the mould into a vacuumizing machine together, and vacuumizing to 0.1MPa to ensure that the glue is uniformly sucked into the interlayer gap of the strip-shaped magnetic core;
s6: putting the die and the strip-shaped magnetic core in the S5 into a baking oven for baking and curing;
s7: taking the die and the strip-shaped magnetic core in the step S6 out of the baking oven, and unloading the die to obtain the cured strip-shaped magnetic core;
s8: cutting the strip-shaped magnetic core obtained in the step S7 to a required external dimension through a machining line to obtain a semi-finished product I-type nanocrystalline magnetic core;
s9: and (5) performing protective epoxy resin spraying on the appearance of the semi-finished product I type nanocrystalline magnetic core obtained in the step (S8) to obtain the finished product I type nanocrystalline magnetic core.
2. The method according to claim 1, wherein the nanocrystalline ribbon is a 1K107B iron-based nanocrystalline ribbon.
3. The method for preparing a type I nanocrystalline magnetic core according to claim 1, characterized in that the heat treatment in step S3 includes the following steps: (1) Rapidly heating the temperature in the atmosphere integrated protection furnace to 400 ℃, then heating to 450-480 ℃ at the speed of 50-65 ℃/h, and filling nitrogen for protection and heat preservation for 1-2 hours; (2) Heating to 550-580 ℃ at the temperature of 45-60 ℃/h, preserving heat for 1-2 h, and simultaneously opening a transverse magnetic field to induce magnetic core grains to enable the magnetic core to have an anti-stress effect; (3) Quickly cooling to 200-250 ℃ at the speed of 150 ℃/h, closing the nitrogen protection, closing the transverse magnetic field, cooling and taking out the mold and the strip-shaped magnetic core.
4. The method for preparing a type I nanocrystalline magnetic core according to claim 1, characterized in that, in step S4, inductance of the strip-shaped magnetic core is tested by an IM3536 LCR tester.
5. The method for preparing the I-type nanocrystalline magnetic core according to claim 4, characterized in that the method for testing the inductance of the strip-shaped magnetic core is to test the inductance of the strip-shaped magnetic core by passing a copper wire through a reserved air gap formed in the strip-shaped magnetic core in the step S2 process and connecting the positive pole and the negative pole of an IM3536 LCR tester to form a loop.
6. The method for preparing a type I nanocrystalline magnetic core according to claim 1, characterized in that the glue in step S5 is a two-component high-temperature curing epoxy glue, and after being uniformly coated on the surface of the strip-shaped magnetic core, the glue is pumped to 0.1MPa by a vacuum pump so that the glue can uniformly penetrate between the strip layers of the strip-shaped magnetic core.
7. The method for preparing a type I nanocrystalline magnetic core according to claim 1, characterized in that, in step S6, the temperature of baking solidification is 120-150 ℃ and the time is 1.5-2h, and the solidification of the bar-shaped magnetic core is completed through baking.
8. The method for preparing a type I nanocrystalline core according to claim 1, characterized in that the protective epoxy resin sprayed in step S9 has a thickness of 0.2-0.3mm.
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| CN110931238A (en) * | 2019-12-09 | 2020-03-27 | 横店集团东磁股份有限公司 | Nanocrystalline magnetic core and preparation method thereof |
| CN113257560A (en) * | 2021-04-16 | 2021-08-13 | 青县择明朗熙电子器件有限公司 | Manufacturing process of rectangular nanocrystalline spraying magnetic core suitable for medium-high frequency environment |
| CN113707443A (en) * | 2021-08-23 | 2021-11-26 | 横店集团东磁股份有限公司 | Preparation method of nanocrystalline magnetic core and nanocrystalline magnetic core |
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- 2022-04-14 CN CN202210389543.1A patent/CN114628144B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016197720A (en) * | 2015-04-02 | 2016-11-24 | 日立金属株式会社 | Magnetic core and manufacturing method therefor, and on-vehicle component |
| WO2018062310A1 (en) * | 2016-09-29 | 2018-04-05 | 日立金属株式会社 | Nanocrystal alloy magnetic core, magnetic core unit, and method for manufacturing nanocrystal alloy magnetic core |
| CN108231316A (en) * | 2016-12-14 | 2018-06-29 | 上海量子绘景电子股份有限公司 | A kind of amorphous nano-crystalline modularization lamination layer, magnetic cell and preparation method thereof |
| CN110931238A (en) * | 2019-12-09 | 2020-03-27 | 横店集团东磁股份有限公司 | Nanocrystalline magnetic core and preparation method thereof |
| CN113257560A (en) * | 2021-04-16 | 2021-08-13 | 青县择明朗熙电子器件有限公司 | Manufacturing process of rectangular nanocrystalline spraying magnetic core suitable for medium-high frequency environment |
| CN113707443A (en) * | 2021-08-23 | 2021-11-26 | 横店集团东磁股份有限公司 | Preparation method of nanocrystalline magnetic core and nanocrystalline magnetic core |
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