Annealing method of iron-based amorphous nanocrystalline magnetic core

Abstract

The invention provides an annealing method of an iron-based amorphous nanocrystalline magnetic core, which comprises the following steps of: preparing a corresponding amorphous nanocrystalline soft magnetic alloy according to an iron-based nanocrystalline magnetic core raw material containing rare earth elements in a preset proportion, and preparing a corresponding soft magnetic alloy belt according to the amorphous nanocrystalline soft magnetic alloy; a soft magnetic alloy belt is wound into a corresponding magnetic core through a full-automatic belt winding machine, the magnetic core is input into a continuous magnetic field heat treatment furnace, a plurality of heat treatment temperature zones are arranged in the continuous magnetic field heat treatment furnace, and continuity exists among the heat treatment temperature zones; and the magnetic core sequentially passes through a plurality of heat treatment temperature zones, so that continuous annealing treatment on the magnetic core is correspondingly completed. The magnetic conductivity of the annealed magnetic core can be greatly improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic core annealing, and in particular to an annealing method for an iron-based amorphous nanocrystalline magnetic core. Background Art

[0002] With the advancement of science and technology, people have developed amorphous nano-soft magnetic alloys, which are called green electronic materials in the 21st century because of their high magnetic permeability, low coercivity and excellent high-frequency soft magnetic properties.

[0003] Nowadays, with the rapid development of computer network technology, 5G communication, electric vehicles, photovoltaic new energy and multimedia technology, electronic devices are required to be miniaturized, energy-efficient and high-frequency. Correspondingly, higher requirements are also placed on soft magnetic materials. Therefore, in order to meet the new requirements, in addition to research on iron-based amorphous alloy cores, improving the core annealing process is also a very important way.

[0004] In the process of preparing magnetic cores in the prior art, most of the produced magnetic cores are passed through the inlet and outlet of the annealing furnace in sequence, and a set transverse magnetic force is directly applied to the magnetic cores passing through the annealing furnace to complete the annealing of the magnetic cores. However, the magnetic permeability of the magnetic cores produced by this annealing method is not high, which makes it unsuitable for use scenarios with higher magnetic permeability requirements. It has certain usage limitations, which correspondingly reduces the user experience. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an annealing method for an iron-based amorphous nanocrystalline magnetic core to solve the problem that the magnetic permeability of the magnetic core produced by the annealing method in the prior art is low, making it difficult to meet the use requirements.

[0006] An embodiment of the present invention provides an annealing method for an iron-based amorphous nanocrystalline magnetic core, characterized in that the method comprises:

[0007] A corresponding amorphous nanocrystalline soft magnetic alloy is prepared according to an iron-based nanocrystalline magnetic core raw material containing a preset proportion of rare earth elements, and a corresponding soft magnetic alloy strip is prepared according to the amorphous nanocrystalline soft magnetic alloy;

[0008] The soft magnetic alloy tape is wound into a corresponding magnetic core by a fully automatic tape winding machine, and the magnetic core is input into a continuous magnetic field heat treatment furnace, wherein the continuous magnetic field heat treatment furnace is provided with a plurality of heat treatment temperature zones, and the plurality of heat treatment temperature zones are continuous;

[0009] The magnetic core is sequentially passed through a plurality of heat treatment temperature zones to correspondingly complete continuous annealing treatment of the magnetic core.

[0010] The beneficial effect of the present invention is that by inputting the magnetic core prepared in real time into a set continuous magnetic field heat treatment furnace, the magnetic core will further pass through several heat treatment temperature zones in the current continuous magnetic field heat treatment furnace in sequence. During the continuous heat treatment process, the current several heat treatment temperature zones can perform annealing treatment on the surface and interior of the magnetic core in various temperature ranges, thereby being able to perform comprehensive annealing treatment on the magnetic core. At the same time, the magnetic permeability of the magnetic core after continuous annealing treatment is higher and the annealing time is shorter, which meets new usage requirements and improves the user experience.

[0011] Furthermore, the method further comprises:

[0012] The several heat treatment temperature zones include a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone and a fifth temperature zone arranged in sequence, wherein the temperature threshold of the first temperature zone is equal to that of the fifth temperature zone, the temperature threshold of the first temperature zone is smaller than the temperature threshold of the second temperature zone, the temperature threshold of the second temperature zone is smaller than the temperature threshold of the third temperature zone, and the temperature threshold of the third temperature zone is smaller than the temperature threshold of the fourth temperature zone.

[0013] Furthermore, the step of winding the soft magnetic alloy strip into a corresponding magnetic core by a fully automatic strip winding machine includes:

[0014] The winding speed of the fully automatic tape winding machine is controlled within 1200-2000 revolutions, and the soft magnetic alloy tape is input into the interior of the fully automatic tape winding machine, so that the soft magnetic alloy tape is wound into a magnetic core with a filling factor of 0.75-0.78 by the fully automatic tape winding machine.

[0015] Furthermore, the step of sequentially passing the magnetic core through a plurality of heat treatment temperature zones to correspondingly complete the continuous annealing treatment of the magnetic core includes:

[0016] When the magnetic core is obtained, the magnetic core is pre-processed, and the pre-processed magnetic core is input into the continuous magnetic field heat treatment furnace at a preset speed through a conveyor belt;

[0017] The magnetic core is sequentially passed through each of the heat treatment temperature zones by the conveyor belt, so that the magnetic core is sequentially subjected to continuous annealing treatment at a specific temperature in each of the heat treatment temperature zones.

[0018] Furthermore, the preset speed is 0.03 m / min.

[0019] Furthermore, the method further comprises:

[0020] A target magnetic field is set at the outlet of the continuous magnetic field heat treatment furnace by a preset current, and the target magnetic field includes a first magnetic pole and a second magnetic pole. The first magnetic pole is set at the top of the continuous magnetic field heat treatment furnace, and the second magnetic pole is set at the bottom of the continuous magnetic field heat treatment furnace.

[0021] Furthermore, the preset current is between 0-10A.

[0022] Furthermore, the magnitude of the target magnetic field is between 0-5000Gs.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A flow chart of an annealing method for an iron-based amorphous nanocrystalline magnetic core provided in the first embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of a continuous magnetic field heat treatment furnace provided in a first embodiment of the present invention;

[0026] Figure 3 A schematic diagram of detecting the hysteresis loop of the magnetic core provided by the first embodiment of the present invention;

[0027] Figure 4 A schematic diagram of detecting a magnetization curve of a magnetic core provided in the first embodiment of the present invention.

[0028] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] See also Figures 1 to 4 , shown is the annealing method of the iron-based amorphous nanocrystalline magnetic core in the first embodiment of the present invention. The annealing method of the iron-based amorphous nanocrystalline magnetic core provided in this embodiment can prepare a nanocrystalline magnetic core with high magnetic permeability, which meets the needs of different users.

[0033] Specifically, the annealing method of the iron-based amorphous nanocrystalline magnetic core provided in this embodiment specifically includes the following steps:

[0034] Step S10, preparing a corresponding amorphous nanocrystalline soft magnetic alloy according to an iron-based nanocrystalline magnetic core raw material containing a preset proportion of rare earth elements, and preparing a corresponding soft magnetic alloy strip according to the amorphous nanocrystalline soft magnetic alloy; wherein, it should be noted that the prepared soft magnetic alloy strip has a variety of sizes, that is, soft magnetic alloy strips of different thicknesses can be prepared respectively. Preferably, the soft magnetic alloy strip prepared in this embodiment has a thickness of 16-18 microns. Furthermore, the magnetic core of this thickness has excellent magnetic permeability after subsequent continuous annealing treatment. In addition, the above-mentioned rare earth element can be boron to facilitate subsequent processing.

[0035] Step S20, winding the soft magnetic alloy tape into a corresponding magnetic core by a fully automatic tape winding machine, and inputting the magnetic core into a continuous magnetic field heat treatment furnace, wherein the continuous magnetic field heat treatment furnace is provided with a plurality of heat treatment temperature zones, and the plurality of heat treatment temperature zones are continuous;

[0036] Step S30 , passing the magnetic core through a plurality of the heat treatment temperature zones in sequence, so as to complete the continuous annealing treatment of the magnetic core accordingly.

[0037] Furthermore, the method further comprises:

[0038] The several heat treatment temperature zones include a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone and a fifth temperature zone arranged in sequence, wherein the temperature threshold of the first temperature zone is equal to that of the fifth temperature zone, the temperature threshold of the first temperature zone is smaller than the temperature threshold of the second temperature zone, the temperature threshold of the second temperature zone is smaller than the temperature threshold of the third temperature zone, and the temperature threshold of the third temperature zone is smaller than the temperature threshold of the fourth temperature zone.

[0039] Specifically, in this embodiment, five heat treatment temperature zones are arranged in the above-mentioned continuous magnetic field heat treatment furnace. Specifically, the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone and the fifth temperature zone are arranged in sequence from the inlet to the outlet. In order to be able to perform comprehensive annealing treatment on the magnetic cores passing through the current continuous magnetic field heat treatment furnace, the above-mentioned five heat treatment temperature zones will cover a larger temperature range. Preferably, the temperature range may be between 420-530 degrees. Specifically, when the temperature is lower than the range, the annealing effect is poor. Correspondingly, when the temperature is higher than the range, the magnetic core will burn out, thereby reducing the yield of the magnetic core. Further, for ease of understanding, the five temperature zones provided in this embodiment are specifically shown in Table 1 below: Table 1

[0040]

[0041] Specifically, by setting five consecutive temperature zones, the magnetic core can be annealed in an all-round manner to correspondingly improve the magnetic permeability of the magnetic core to meet the user's usage requirements.

[0042] Furthermore, the step of winding the soft magnetic alloy strip into a corresponding magnetic core by a fully automatic strip winding machine includes:

[0043] The winding speed of the fully automatic tape winding machine is controlled within 1200-2000 revolutions, and the soft magnetic alloy tape is input into the interior of the fully automatic tape winding machine, so that the soft magnetic alloy tape is wound into a magnetic core with a filling factor of 0.75-0.78 by the fully automatic tape winding machine.

[0044] Furthermore, the step of sequentially passing the magnetic core through a plurality of heat treatment temperature zones to correspondingly complete the continuous annealing treatment of the magnetic core includes:

[0045] When the magnetic core is obtained, the magnetic core is pre-processed, and the pre-processed magnetic core is input into the continuous magnetic field heat treatment furnace at a preset speed through a conveyor belt;

[0046] The magnetic core is sequentially passed through each of the heat treatment temperature zones by the conveyor belt, so that the magnetic core is sequentially subjected to continuous annealing treatment at a specific temperature in each of the heat treatment temperature zones.

[0047] Further, the preset speed is 0.03 m / min. In other cases, it can also be set to 0.02 m / min or 0.06 m / min, all within the protection scope of this embodiment.

[0048] Furthermore, the method further comprises:

[0049] A target magnetic field is set at the outlet of the continuous magnetic field heat treatment furnace by a preset current, and the target magnetic field includes a first magnetic pole and a second magnetic pole, wherein the first magnetic pole is set at the top of the continuous magnetic field heat treatment furnace, and the second magnetic pole is set at the bottom of the continuous magnetic field heat treatment furnace. Figure 2 As shown, in order to further improve the magnetic permeability of the magnetic core after annealing, the present embodiment will further set a first magnetic pole and a second magnetic pole at the outlet of the above-mentioned continuous magnetic field heat treatment furnace. The first magnetic pole and the second magnetic pole can generate a strong magnetic field between the two. When the above-mentioned magnetic core passes through the magnetic field, it can give the magnetic core a certain magnetic field force. Based on this, the magnetism of the above-mentioned magnetic core can be further improved, so that the magnetic permeability of the above-mentioned magnetic core can be correspondingly improved to meet the user's usage requirements. It should also be pointed out that the above-mentioned first magnetic pole and the second magnetic pole form a vertical constant magnetic field at the outlet of the current continuous magnetic field heat treatment furnace. Preferably, the magnetic field strength of the vertical constant magnetic field is set between 60A / m-100A / m, and the current first magnetic pole and the second magnetic pole are set in a positive direction relative to each other to further facilitate subsequent processing.

[0050] Furthermore, the preset current is between 0-10A.

[0051] Furthermore, the magnitude of the target magnetic field is between 0-5000Gs.

[0052] In addition, it should be noted that the annealing method of the iron-based amorphous nanocrystalline magnetic core provided in this embodiment will produce different magnetic permeabilities according to the different band thicknesses of the magnetic core. Specifically, for ease of understanding, the specific situation is shown in the following Table 2: Table 2

[0053]

[0054] Through the comparison of the above Table 2, it can be obtained that when the frequency point of the magnetic core reaches 10KHz, the magnetic permeability of the present invention can be improved by 20-40% compared with the prior art. Furthermore, when the frequency point of the magnetic core reaches 100KHz, the magnetic permeability of the present invention can be improved by 20-30% compared with the prior art. In addition, the annealing method of the present invention is shorter in time and more efficient than the prior art, and the magnetic permeability generated is also higher, thereby correspondingly meeting the user's usage requirements.

[0055] In addition, it should be noted that after the annealing of the magnetic core is completed by the prior art and the annealing of the magnetic core is completed by the iron-based amorphous nanocrystalline magnetic core of the present invention, the magnetic cores of the prior art and the present invention after annealing will be further placed in a cold and hot shock box at a temperature of -40 degrees to 155 degrees for a continuous 1000-hour impact test. Furthermore, the two magnetic cores after the test are placed at room temperature for 24 hours, and the inductance changes of the two magnetic cores are tested in real time. Among them, the inductance changes of the magnetic cores prepared by the annealing method of the present invention are shown in Table 3 below: Table 3

[0056]

[0057] Correspondingly, the inductance variation of the magnetic core prepared by the annealing method of the prior art is shown in Table 4 below:

[0058]

[0059]

[0060] After a detailed comparison of Table 3 and Table 4, it can be concluded that the annealing method of the present invention can not only effectively improve the inductance of the magnetic core compared to the prior art, but also the rate of change of inductance after 1000 hours of hot and cold shock is relatively small, which proves that the annealing method of the present invention can not only effectively improve the inductance of the magnetic core, but also the stability of the magnetic induction is relatively high, and is suitable for large-scale promotion and use.

[0061] In summary, the annealing method of the iron-based amorphous nanocrystalline magnetic core in the above embodiment of the present invention can not only effectively improve the magnetic permeability of the magnetic core, but also improve the stability of the magnetic core inductance, meet new usage requirements, and correspondingly improve the user experience.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An annealing method for an iron-based amorphous nanocrystalline magnetic core, characterized in that: The method comprises: A corresponding amorphous nanocrystalline soft magnetic alloy is prepared according to an iron-based nanocrystalline magnetic core raw material containing a preset proportion of rare earth elements, and a corresponding soft magnetic alloy strip is prepared according to the amorphous nanocrystalline soft magnetic alloy; The soft magnetic alloy tape is wound into a corresponding magnetic core by a fully automatic tape winding machine, and the magnetic core is input into a continuous magnetic field heat treatment furnace, wherein the continuous magnetic field heat treatment furnace is provided with a plurality of heat treatment temperature zones, and the plurality of heat treatment temperature zones are continuous; Passing the magnetic core through a plurality of heat treatment temperature zones in sequence to correspondingly complete continuous annealing treatment of the magnetic core; Wherein, the method further comprises: A target magnetic field is set at the outlet of the continuous magnetic field heat treatment furnace by a preset current, and the target magnetic field includes a first magnetic pole and a second magnetic pole. The first magnetic pole is set at the top of the continuous magnetic field heat treatment furnace, and the second magnetic pole is set at the bottom of the continuous magnetic field heat treatment furnace.

2. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The method further comprises: The several heat treatment temperature zones include a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone and a fifth temperature zone arranged in sequence, wherein the temperature threshold of the first temperature zone is equal to that of the fifth temperature zone, the temperature threshold of the first temperature zone is smaller than the temperature threshold of the second temperature zone, the temperature threshold of the second temperature zone is smaller than the temperature threshold of the third temperature zone, and the temperature threshold of the third temperature zone is smaller than the temperature threshold of the fourth temperature zone.

3. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The step of winding the soft magnetic alloy strip into a corresponding magnetic core by a fully automatic strip winding machine comprises: The winding speed of the fully automatic tape winding machine is controlled within 1200-2000 revolutions, and the soft magnetic alloy tape is input into the interior of the fully automatic tape winding machine, so that the soft magnetic alloy tape is wound into a magnetic core with a filling factor of 0.75-0.78 by the fully automatic tape winding machine.

4. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The step of sequentially passing the magnetic core through a plurality of heat treatment temperature zones to correspondingly complete the continuous annealing treatment of the magnetic core comprises: When the magnetic core is obtained, the magnetic core is pre-processed, and the pre-processed magnetic core is input into the continuous magnetic field heat treatment furnace at a preset speed through a conveyor belt; The magnetic core is sequentially passed through each of the heat treatment temperature zones by the conveyor belt, so that the magnetic core is sequentially subjected to continuous annealing treatment at a specific temperature in each of the heat treatment temperature zones.

5. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 4, characterized in that: The preset speed is 0.03 m / min.

6. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The first magnetic pole is an N pole, the second magnetic pole is an S pole, and the first magnetic pole and the second magnetic pole are arranged opposite to each other in a positive direction.

7. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The first magnetic pole and the second magnetic pole form a vertical constant magnetic field at the outlet of the continuous magnetic field heat treatment furnace, and the magnetic field strength of the vertical constant magnetic field is between 60A / m-100A / m.

8. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The preset current is between 0-10A.

9. The annealing method of the iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The magnitude of the target magnetic field is between 0-5000Gs.

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