CN111354560A - Heat treatment method of common-mode inductance nanocrystalline magnetic core - Google Patents
Heat treatment method of common-mode inductance nanocrystalline magnetic core Download PDFInfo
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- CN111354560A CN111354560A CN202010203060.9A CN202010203060A CN111354560A CN 111354560 A CN111354560 A CN 111354560A CN 202010203060 A CN202010203060 A CN 202010203060A CN 111354560 A CN111354560 A CN 111354560A
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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
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Abstract
The invention relates to a heat treatment method of a common-mode inductance nanocrystalline magnetic core, which comprises the following steps: firstly, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing; secondly, heating the temperature from room temperature to 480-490 ℃, and preserving the heat for 60-80 min; thirdly, raising the temperature from 480-490 ℃ to 550-555 ℃, and preserving the heat for 80-90 min; fourthly, reducing the furnace temperature of the vacuum furnace to 350 ℃ or below, and taking out the nanocrystalline magnetic core semi-finished product after the furnace temperature is reduced to 350 ℃ or below; fifthly, placing the nanocrystalline magnetic core semi-finished product in the fourth step into a transverse magnetic furnace; sixthly, heating the temperature from room temperature to 400-410 ℃, preserving the temperature for 120min, and adding transverse magnetism treatment in the heat preservation process; and seventhly, reducing the furnace temperature of the transverse magnetic furnace to 350 ℃ or below, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 350 ℃ or below. The technical scheme of the invention can obtain the nanocrystalline magnetic core finished product with high magnetic permeability, has higher Q value, and has better filtering effect and lower loss when being applied to a high-frequency environment.
Description
Technical Field
The invention relates to the technical field of common-mode inductance magnetic core processing, in particular to a heat treatment method of a common-mode inductance nanocrystalline magnetic core.
Background
The common mode inductor is also called as a common mode choke coil, and is commonly used in a switching power supply of a computer to filter common mode electromagnetic interference signals. In the board design, the common mode inductor also plays a role in EMI filtering, and is used for inhibiting electromagnetic waves generated by the high-speed signal line from radiating and emitting outwards.
At present, the common mode inductor applied in a high frequency environment is poor in filtering effect and high in loss due to the fact that the magnetic permeability and the Q value of an internal magnetic core of the common mode inductor are low. Therefore, the problems to be solved are: how to improve the magnetic permeability and the Q value of the common mode inductor magnetic core so that the common mode inductor can be suitable for a high-frequency environment.
Disclosure of Invention
The invention aims to provide a heat treatment method of a common mode inductor nanocrystalline magnetic core, which can effectively improve the magnetic permeability and Q value of the nanocrystalline magnetic core, so that the common mode inductor provided with the nanocrystalline magnetic core has better filtering effect and reduces the loss when being applied to a high-frequency environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat treatment method of a common mode inductance nanocrystalline magnetic core comprises the following steps:
step one, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing;
step two, heating the temperature from room temperature to 480-490 ℃, and preserving the heat for 60-80 min;
thirdly, raising the temperature from 480-490 ℃ to 550-555 ℃, and preserving the heat for 80-90 min;
step four, reducing the temperature of the furnace body of the vacuum furnace to 350 ℃ and below, and taking out the nanocrystalline magnetic core semi-finished product after the temperature of the furnace body is reduced to 350 ℃ and below;
placing the nanocrystalline magnetic core semi-finished product in the fourth step into a transverse magnetic furnace;
heating the temperature from room temperature to 400-410 ℃, preserving the heat for 120min, and simultaneously carrying out transverse magnetic treatment in the heat preservation process;
and step seven, reducing the furnace temperature of the transverse magnetic furnace to 350 ℃ or below, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 350 ℃ or below.
Preferably, the temperature in the second step is increased from room temperature to 480 ℃, and then the temperature is kept for 60 min.
Preferably, the temperature in the third step is increased from 480 ℃ to 550 ℃, and then the temperature is kept for 80 min.
Preferably, the temperature in the sixth step is increased from room temperature to 400 ℃, and then the temperature is maintained for 120 min.
Preferably, the magnetic field intensity applied by the transverse magnetic furnace in the sixth step is 1200Gs-1400 Gs.
Preferably, the magnetic field intensity applied by the transverse magnetic furnace is 1300 Gs.
Preferably, the Q value of the finished product of the nanocrystalline magnetic core in the seventh step is not lower than 0.95.
Compared with the prior art, the invention has the beneficial effects that:
according to the heat treatment method of the common-mode inductance nanocrystalline magnetic core, the nanocrystalline magnetic core to be treated is subjected to heat treatment in the vacuum furnace to obtain a nanocrystalline magnetic core semi-finished product, then the nanocrystalline magnetic core semi-finished product is placed in the transverse magnetic furnace to be subjected to heating, heat preservation, transverse magnetic field application, cooling and other operations to obtain a nanocrystalline magnetic core finished product, the nanocrystalline magnetic core finished product has higher magnetic permeability and Q value than a conventional magnetic core in a high-frequency environment, and therefore the common-mode inductance provided with the nanocrystalline magnetic core finished product can have a better filtering effect in the high-frequency environment, and the loss of the common-mode inductance nanocrystalline magnetic core finished product can be effectively reduced.
Detailed Description
In order to better understand the present invention, the following description will be further described with reference to some examples. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
Example one
In this embodiment, the specific steps of processing the nanocrystalline magnetic core by the experimenter through a heat treatment method are as follows:
step one, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing;
step two, heating the temperature from room temperature to 480 ℃, and preserving the temperature for 60 min;
step three, heating the temperature from 480 ℃ to 550 ℃, and preserving the heat for 80 min;
step four, reducing the temperature of the furnace body of the vacuum furnace to 350 ℃, and taking out the nanocrystalline magnetic core semi-finished product after the temperature of the furnace body is reduced to 350 ℃;
step five, placing the nanocrystalline magnetic core semi-finished product taken out in the step four into a transverse magnetic furnace;
heating the temperature from room temperature to 400 ℃, preserving the temperature for 120min, and simultaneously carrying out transverse magnetic treatment in the heat preservation process, wherein the intensity of the magnetic field applied to the transverse magnetic furnace is 1300 Gs;
and step seven, reducing the furnace temperature of the transverse magnetic furnace to 350 ℃, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 350 ℃.
It will be appreciated that the above first stage process can be described as: firstly, an experimenter places a nanocrystalline magnetic core to be processed in a vacuum furnace, and then carries out vacuum pumping processing on the vacuum furnace so as to protect the nanocrystalline magnetic core in the vacuum furnace and prevent the nanocrystalline magnetic core from being oxidized; then, carrying out heat treatment on the nanocrystalline magnetic core in the vacuum furnace, raising the temperature of a furnace body of the vacuum furnace from room temperature to 480 ℃, and then preserving the temperature for 60 min; after the temperature is preserved for 60min, the temperature is raised from 480 ℃ to 550 ℃ again and preserved for 80 min; keeping the temperature for 80min, cooling the furnace body of the vacuum furnace to 350 ℃, and taking out the prepared nanocrystalline magnetic core semi-finished product. After the temperature of the furnace body is reduced to 350 ℃, an experimenter can take out the nanocrystalline magnetic core semi-finished product, and the prepared nanocrystalline magnetic core semi-finished product can be prevented from being oxidized.
As can be appreciated, in the second stage, the experimenter places the prepared nanocrystalline magnetic core semi-finished product in a transverse magnetic furnace; then, carrying out heat treatment and magnetic treatment on the nanocrystalline magnetic core semi-finished product in the transverse magnetic furnace, raising the temperature of the transverse magnetic furnace from room temperature to 400 ℃, then preserving the temperature for 120min, and meanwhile, applying a transverse magnetic field with the magnetic field intensity of 1300Gs in the heat preservation process; and finally, after keeping the temperature for 120min, reducing the furnace temperature of the transverse magnetic furnace to 350 ℃, and then taking out the prepared nanocrystalline magnetic core finished product. Wherein, only after the furnace temperature is reduced to 350 ℃, the experimenter can take out the nanocrystalline magnetic core finished product, which can prevent the prepared nanocrystalline magnetic core finished product from being oxidized
Taking the finished product of the nanocrystalline magnetic core with the specification of 30 × 20 × 10 as an example, the performance of the conventional magnetic core is compared with that of the finished product of the nanocrystalline magnetic core in the embodiment as follows:
it can be understood that, in a high-frequency environment, compared with a conventional magnetic core, the magnetic permeability and the Q value of the finished product of the nanocrystalline magnetic core in the embodiment are more excellent, and then the finished product of the nanocrystalline magnetic core has a better filtering effect and lower loss when being applied to the high-frequency environment.
Example two
In this embodiment, the step of processing the nanocrystalline magnetic core by the experimenter through the heat treatment method is as follows:
step one, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing;
step two, heating the temperature from room temperature to 490 ℃, and preserving the heat for 80 min;
step three, heating the temperature from 490 ℃ to 555 ℃, and preserving the heat for 90 min;
step four, reducing the temperature of the furnace body of the vacuum furnace to 300 ℃, and taking out the nanocrystalline magnetic core semi-finished product after the temperature of the furnace body is reduced to 300 ℃;
step five, placing the nanocrystalline magnetic core semi-finished product taken out in the step four into a transverse magnetic furnace;
heating the temperature from room temperature to 410 ℃, preserving the temperature for 120min, and simultaneously carrying out transverse magnetic treatment in the heat preservation process, wherein the magnetic field intensity applied to the transverse magnetic furnace is 1200 Gs;
and step seven, reducing the furnace temperature of the transverse magnetic furnace to 300 ℃, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 300 ℃.
Taking the finished product of the nanocrystalline magnetic core with the specification of 30 × 20 × 10 as an example, the performance of the conventional magnetic core is compared with that of the finished product of the nanocrystalline magnetic core in the embodiment as follows:
it can be understood that, in a high-frequency environment, compared with a conventional magnetic core, the magnetic permeability and the Q value of the finished product of the nanocrystalline magnetic core in the embodiment are more excellent, and further the finished product of the nanocrystalline magnetic core has a better filtering effect and lower loss when being applied to the high-frequency environment.
EXAMPLE III
In this embodiment, the step of processing the nanocrystalline magnetic core by the experimenter through the heat treatment method is as follows:
step one, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing;
step two, heating the temperature from room temperature to 480 ℃, and preserving the temperature for 60 min;
step three, heating the temperature from 480 ℃ to 555 ℃, and preserving the heat for 90 min;
step four, reducing the temperature of the furnace body of the vacuum furnace to 330 ℃, and taking out the nanocrystalline magnetic core semi-finished product after the temperature of the furnace body is reduced to 330 ℃;
step five, placing the nanocrystalline magnetic core semi-finished product taken out in the step four into a transverse magnetic furnace;
heating the temperature from room temperature to 400 ℃, preserving the temperature for 120min, and simultaneously carrying out transverse magnetic treatment in the heat preservation process, wherein the intensity of the magnetic field applied to the transverse magnetic furnace is 1400 Gs;
and step seven, reducing the furnace temperature of the transverse magnetic furnace to 330 ℃, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 300 ℃.
Taking the finished product of the nanocrystalline magnetic core with the specification of 30 × 20 × 10 as an example, the performance of the conventional magnetic core is compared with that of the finished product of the nanocrystalline magnetic core in the embodiment as follows:
it can be understood that, in a high-frequency environment, compared with a conventional magnetic core, the magnetic permeability and the Q value of the finished product of the nanocrystalline magnetic core in the embodiment are more excellent, and further the finished product of the nanocrystalline magnetic core has a better filtering effect and lower loss when being applied to the high-frequency environment.
The heat treatment method of the common-mode inductance nanocrystalline magnetic core provided in the above embodiments is to perform heat treatment on the nanocrystalline magnetic core to be treated in the vacuum furnace to obtain a nanocrystalline magnetic core semi-finished product, and then place the nanocrystalline magnetic core semi-finished product in the transverse magnetic furnace to perform operations such as temperature rise, heat preservation, transverse magnetic field application, temperature reduction and the like to obtain a nanocrystalline magnetic core finished product, wherein the magnetic permeability of the prepared nanocrystalline magnetic core finished product in different high-frequency environments is higher than that of a conventional magnetic core, and the Q value of the nanocrystalline magnetic core finished product is not lower than 0.95, so that the common-mode inductance provided with the nanocrystalline magnetic core finished product has a better filtering effect, and the loss of the common-mode inductance provided with the nanocrystalline magnetic core finished product can be.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. A heat treatment method of a common mode inductance nanocrystalline magnetic core is characterized by comprising the following steps:
step one, placing a nanocrystalline magnetic core to be treated in a vacuum furnace and vacuumizing;
step two, heating the temperature from room temperature to 480-490 ℃, and preserving the heat for 60-80 min;
thirdly, raising the temperature from 480-490 ℃ to 550-555 ℃, and preserving the heat for 80-90 min;
step four, reducing the temperature of the furnace body of the vacuum furnace to 350 ℃ and below, and taking out the nanocrystalline magnetic core semi-finished product after the temperature of the furnace body is reduced to 350 ℃ and below;
placing the nanocrystalline magnetic core semi-finished product in the fourth step into a transverse magnetic furnace;
heating the temperature from room temperature to 400-410 ℃, preserving the heat for 120min, and simultaneously carrying out transverse magnetic treatment in the heat preservation process;
and step seven, reducing the furnace temperature of the transverse magnetic furnace to 350 ℃ or below, and taking out the finished product of the nanocrystalline magnetic core after the furnace temperature of the transverse magnetic furnace is reduced to 350 ℃ or below.
2. The heat treatment method according to claim 1, wherein the temperature is raised from room temperature to 480 ℃ in the second step, and then the temperature is maintained for 60 min.
3. The heat treatment method according to claim 1, wherein the temperature in the third step is raised from 480 ℃ to 550 ℃, and then the temperature is maintained for 80 min.
4. The heat treatment method according to any one of claims 1 to 3, wherein the temperature in the sixth step is raised from room temperature to 400 ℃ and then kept for 120 min.
5. The heat treatment method according to claim 4, wherein the magnetic field strength applied by the transverse magnetic furnace in the sixth step is 1200Gs to 1400 Gs.
6. The heat treatment method according to claim 5, wherein the transverse magnetic furnace applies a magnetic field strength of 1300 Gs.
7. The heat treatment method according to claim 5 or 6, wherein the Q value of the finished nanocrystalline magnetic core in step seven is not less than 0.95.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112885593A (en) * | 2021-01-29 | 2021-06-01 | 佛山市中研非晶科技股份有限公司 | Heat treatment method for high-precision current sensor magnetic core |
| CN112961968A (en) * | 2021-01-29 | 2021-06-15 | 佛山市中研非晶科技股份有限公司 | Heat treatment method for high-linearity current transformer magnetic core |
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