An iron-based amorphous alloy core annealing process and an iron-based amorphous alloy core

Abstract

The present invention provides an annealing process for an iron-based amorphous alloy magnetic core and an iron-based amorphous alloy magnetic core. The method repeats twice the process of heating, keeping warm, re-heating, re-keeping warm and cooling the iron-based amorphous alloy magnetic core in sequence, wherein the parameters of the heating process and the keeping warm process are different. In addition, under nitrogen protection, during the magnetization treatment, the heating, keeping warm and cooling processes are sequentially performed to finally complete the annealing process of the entire iron-based amorphous alloy magnetic core and obtain the target iron-based amorphous alloy magnetic core. The iron-based amorphous alloy magnetic core prepared using the method has good magnetic permeability and temperature stability at a frequency point of 1 to 200 kHz.

Description

Technical Field

[0001] The invention belongs to the technical field of iron-based amorphous alloy core annealing, and particularly relates to an iron-based amorphous alloy core annealing process and an iron-based amorphous alloy core. Background Art

[0002] Amorphous and nanocrystalline soft magnetic alloys, known as the green electronic materials of the 21st century, have high magnetic permeability, low coercivity, and excellent high-frequency soft magnetic properties. They have received extensive attention and research from both academic and business communities in recent years.

[0003] With the rapid development of computer network technology, 5G communications, electric vehicles, photovoltaic new energy and multimedia technology, requirements for miniaturization, energy saving and high frequency have been put forward for electronic devices, which in turn puts forward newer and higher requirements for soft magnetic materials, that is, soft magnetic materials are required to have higher magnetic permeability, lower loss and good temperature stability.

[0004] To meet the new requirements, in addition to research on iron-based amorphous alloy core materials, improving the annealing process is also a very important approach. Therefore, there is an urgent need for an iron-based amorphous alloy core annealing process to improve the magnetic permeability of the core. Summary of the Invention

[0005] Based on this, an embodiment of the present invention provides an annealing process for an iron-based amorphous alloy magnetic core and an iron-based amorphous alloy magnetic core, aiming to improve the magnetic permeability and temperature stability of the iron-based amorphous alloy magnetic core.

[0006] A first aspect of an embodiment of the present invention provides an annealing process for an iron-based amorphous alloy magnetic core, comprising the following steps:

[0007] placing the iron-based amorphous alloy core into an annealing furnace, heating it to a first preset temperature within a first preset time under a vacuum state, and performing a first heat preservation treatment at the first preset temperature;

[0008] After the first heat preservation treatment, the temperature is raised to a second preset temperature according to a second preset time, and a second heat preservation treatment is performed at the second preset temperature;

[0009] After the second heat preservation treatment, the core is cooled to a third preset temperature in the annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions;

[0010] placing the iron-based amorphous alloy core back into the annealing furnace, heating it to a fourth preset temperature within a third preset time under a vacuum state, and performing a third heat preservation treatment at the fourth preset temperature;

[0011] After the third heat preservation treatment, the temperature is raised to a fifth preset temperature according to a fourth preset time, and a fourth heat preservation treatment is performed at the fifth preset temperature;

[0012] After the fourth heat preservation treatment, the temperature is raised to a sixth preset temperature according to a fifth preset time, and a fifth heat preservation treatment is performed at the sixth preset temperature;

[0013] After the fifth heat preservation treatment, the core is cooled to the third preset temperature in the annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions;

[0014] The iron-based amorphous alloy magnetic core is placed back into the annealing furnace and subjected to magnetization treatment under nitrogen protection to obtain the target iron-based amorphous alloy magnetic core.

[0015] Preferably, the vacuum degree in the vacuum state is -0.09 to -0.11 MPa.

[0016] Preferably, in the step of heating to a first preset temperature according to a first preset time and performing a first insulation treatment at the first preset temperature, the first preset time is 30 to 50 minutes, the first preset temperature is 410 to 430°C, and the insulation time of the first insulation treatment is 30 to 50 minutes.

[0017] Preferably, after the first insulation treatment, the temperature is raised to a second preset temperature according to a second preset time, and in the step of performing a second insulation treatment at the second preset temperature, the second preset time is 50 to 70 minutes, the second preset temperature is 460 to 480°C, and the insulation time of the second insulation treatment is 50 to 70 minutes.

[0018] Preferably, after the second heat preservation treatment, the iron-based amorphous alloy core is cooled to a third preset temperature in the annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions. In the step, the third preset temperature is 200-300°C.

[0019] Preferably, in the step of placing the iron-based amorphous alloy core back into the annealing furnace, heating it to a fourth preset temperature under a vacuum state according to a third preset time, and performing a third insulation treatment at the fourth preset temperature, the third preset time is 50 to 70 minutes, the fourth preset temperature is 410 to 430°C, and the insulation time of the third insulation treatment is 30 to 50 minutes.

[0020] Preferably, after the third insulation treatment, the temperature is raised to a fifth preset temperature according to a fourth preset time, and a fourth insulation treatment is performed at the fifth preset temperature. The fourth preset time is 30 to 50 minutes, the fifth preset temperature is 470 to 490°C, and the insulation time of the fourth insulation treatment is 60 to 80 minutes.

[0021] Preferably, after the fourth insulation treatment, the temperature is raised to the sixth preset temperature according to the fifth preset time, and in the step of performing the fifth insulation treatment at the sixth preset temperature, the fifth preset time is 50 to 70 minutes, the sixth preset temperature is 550 to 610°C, and the insulation time of the fifth insulation treatment is 110 to 130 minutes.

[0022] Preferably, in the step of placing the iron-based amorphous alloy magnetic core back into the annealing furnace and performing magnetization treatment under nitrogen protection to obtain the target iron-based amorphous alloy magnetic core, the temperature is first raised to a seventh preset temperature according to a sixth preset time, and a sixth insulation treatment is performed at the seventh preset temperature, and then the core is cooled to the third preset temperature in the annealing furnace and taken out of the furnace, wherein the sixth preset time is 50 to 70 minutes, the seventh preset temperature is 350 to 500°C, and the insulation time of the sixth insulation treatment is 110 to 130 minutes.

[0023] A second aspect of the embodiments of the present invention provides an iron-based amorphous alloy magnetic core, which is prepared by using the above-mentioned iron-based amorphous alloy magnetic core annealing process.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The iron-based amorphous alloy core is subjected to a process of heating, heat preservation, re-heating, re-heating and cooling in sequence by repeating twice, wherein the parameters of the heating process and the heat preservation process are different. In addition, under nitrogen protection, during the magnetization treatment, the core is subjected to the processes of heating, heat preservation and cooling in sequence, and finally the annealing process of the entire iron-based amorphous alloy core is completed to obtain the target iron-based amorphous alloy core. The iron-based amorphous alloy core prepared by this method has good magnetic permeability and temperature stability at a frequency point of 1 to 200 kHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a test graph of the magnetic permeability of the magnetic core obtained by the annealing process of the fourteenth embodiment of the present invention and the magnetic permeability of the magnetic core obtained by the traditional annealing process;

[0027] Figure 2 and Figure 3 is a hysteresis loop diagram of a magnetic core obtained by the annealing process of the fourteenth embodiment of the present invention;

[0028] Figure 4 and Figure 5 1 is a hysteresis loop diagram of a magnetic core made of the same material and size as in the fourteenth embodiment of the present invention but obtained by a traditional annealing process.

[0029] The following specific implementation manner will be further described in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0031] 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 an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] On the one hand, the present invention addresses the problem that currently prepared soft magnetic materials still have low magnetic permeability and poor temperature stability, and proposes an annealing process for iron-based amorphous alloy magnetic cores, wherein the preparation method comprises the following steps:

[0034] placing the iron-based amorphous alloy core into an annealing furnace, heating it to a first preset temperature within a first preset time under a vacuum state, and performing a first heat preservation treatment at the first preset temperature;

[0035] After the first heat preservation treatment, the temperature is raised to a second preset temperature according to a second preset time, and a second heat preservation treatment is performed at the second preset temperature;

[0036] After the second heat preservation treatment, the core is cooled to a third preset temperature in an annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions;

[0037] placing the iron-based amorphous alloy core back into the annealing furnace, heating it to a fourth preset temperature within a third preset time under vacuum, and performing a third heat preservation treatment at the fourth preset temperature;

[0038] After the third heat preservation treatment, the temperature is raised to a fifth preset temperature according to a fourth preset time, and a fourth heat preservation treatment is performed at the fifth preset temperature;

[0039] After the fourth heat preservation treatment, the temperature is raised to a sixth preset temperature according to a fifth preset time, and a fifth heat preservation treatment is performed at the sixth preset temperature;

[0040] After the fifth heat preservation treatment, the core is cooled to a third preset temperature in an annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions;

[0041] The iron-based amorphous alloy core is placed back into the annealing furnace and magnetized under nitrogen protection to obtain the target iron-based amorphous alloy core.

[0042] In some embodiments of the present invention, the iron-based amorphous alloy magnetic core may be a magnetic core wound using 1K107B strip.

[0043] In some embodiments of the present invention, the vacuum degree in the vacuum state is -0.09 to -0.11 MPa, for example, -0.09 MPa, -0.1 MPa, -0.11 MPa, etc.

[0044] In the step of heating to a first preset temperature according to a first preset time and performing a first insulation treatment at the first preset temperature, the first preset time is 30 to 50 minutes, the first preset temperature is 410 to 430°C, and the insulation time of the first insulation treatment is 30 to 50 minutes.

[0045] In the step of heating the temperature to a second preset temperature according to a second preset time after the first insulation treatment of the present invention, and performing a second insulation treatment at the second preset temperature, the second preset time is 50 to 70 minutes, the second preset temperature is 460 to 480°C, and the insulation time of the second insulation treatment is 50 to 70 minutes.

[0046] After the second heat preservation treatment, the present invention cools to a third preset temperature in an annealing furnace, then takes the iron-based amorphous alloy core out of the annealing furnace and cools to room temperature under natural conditions. The third preset temperature is 200-300°C.

[0047] In the present invention, the iron-based amorphous alloy magnetic core is placed back into the annealing furnace, heated to a fourth preset temperature according to a third preset time under a vacuum state, and subjected to a third insulation treatment at the fourth preset temperature. The third preset time is 50 to 70 minutes, the fourth preset temperature is 410 to 430°C, and the insulation time of the third insulation treatment is 30 to 50 minutes.

[0048] After the third insulation treatment of the present invention, the temperature is raised to the fifth preset temperature according to the fourth preset time, and the fourth insulation treatment is performed at the fifth preset temperature. The fourth preset time is 30 to 50 minutes, the fifth preset temperature is 470 to 490°C, and the insulation time of the fourth insulation treatment is 60 to 80 minutes.

[0049] After the fourth insulation treatment of the present invention, the temperature is raised to the sixth preset temperature according to the fifth preset time, and the fifth insulation treatment is performed at the sixth preset temperature. The fifth preset time is 50 to 70 minutes, the sixth preset temperature is 550 to 610°C, and the insulation time of the fifth insulation treatment is 110 to 130 minutes.

[0050] In the present invention, the iron-based amorphous alloy magnetic core is placed back into the annealing furnace and magnetized under nitrogen protection to obtain the target iron-based amorphous alloy magnetic core. The temperature is first raised to a seventh preset temperature according to a sixth preset time, and a sixth heat preservation treatment is performed at the seventh preset temperature. The core is then cooled to the third preset temperature in the annealing furnace and taken out of the furnace. The sixth preset time is 50 to 70 minutes, the seventh preset temperature is 350 to 500°C, and the heat preservation time of the sixth heat preservation treatment is 110 to 130 minutes.

[0051] The annealing process of the iron-based amorphous alloy magnetic core of the present invention can be as follows: placing a magnetic core wound with a 1K107B strip into an annealing furnace, heating it to 410-430° C. for 30-50 minutes under a vacuum degree of -0.09-0.11 MPa, keeping it warm for 30-50 minutes, then heating it to 460-480° C. for 50-70 minutes, keeping it warm for 50-70 minutes, and then cooling it to 200-300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core is then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0052] The iron-based amorphous alloy core is placed back into the annealing furnace, and under a vacuum degree of -0.09 to -0.11 MPa, the temperature is raised to 410 to 430°C for 50 to 70 minutes, and the temperature is kept at this temperature for 30 to 50 minutes. The temperature is then raised to 470 to 490°C for another 30 to 50 minutes, and the temperature is kept at this temperature for 60 to 80 minutes. The temperature is then raised again to 550 to 610°C for another 50 to 70 minutes, and the temperature is kept at this temperature for 110 to 130 minutes. The iron-based amorphous alloy core is then cooled to 200 to 300°C in the annealing furnace. The iron-based amorphous alloy core is then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0053] The iron-based amorphous alloy core is placed back into the annealing furnace and magnetized under nitrogen protection. The temperature is first raised to 350-500°C for 50-70 minutes and kept at this temperature for 110-130 minutes. The heating power of the annealing furnace is then turned off. The core is removed from the furnace when the temperature cools to 200-300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core. Specifically, since high-frequency characteristics vary at different temperatures, the specific seventh preset temperature needs to be determined based on the application and performance requirements of the core.

[0054] Another aspect of the present invention further provides an iron-based amorphous alloy magnetic core, which is prepared by using the above-mentioned iron-based amorphous alloy magnetic core annealing process.

[0055] To facilitate understanding of the present invention, several embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0056] Example 1

[0057] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 14 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0058] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0059] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0060] Example 2

[0061] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 14 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, and then heated to 470° C. for 60 minutes. After holding at that temperature for 60 minutes, the core was cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0062] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0063] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0064] Example 3

[0065] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 14 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0066] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0067] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0068] Example 4

[0069] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 16 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0070] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0071] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0072] Example 5

[0073] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 16 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0074] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0075] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0076] Example 6

[0077] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 16 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0078] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0079] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0080] Example 7

[0081] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 18 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0082] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0083] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0084] Example 8

[0085] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 16 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0086] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0087] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0088] Embodiment 9

[0089] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 18 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0090] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0091] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0092] Example 10

[0093] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 20 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0094] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0095] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0096] Example 11

[0097] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 20 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0098] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0099] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0100] Example 12

[0101] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 20 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0102] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0103] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0104] Example 13

[0105] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 22 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0106] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0107] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0108] Example 14

[0109] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 22 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0110] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0111] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0112] Example 15

[0113] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 22 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0114] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0115] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0116] Example 16

[0117] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 24 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 410° C. for 30 minutes under a vacuum of -0.09 MPa, held at that temperature for 30 minutes, then heated to 460° C. for 50 minutes, held at that temperature for 50 minutes, and then cooled to 200° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0118] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.09 MPa, the temperature was raised to 410°C for 50 minutes, kept at this temperature for 30 minutes, then raised to 470°C for 30 minutes, kept at this temperature for 60 minutes, and then raised to 550°C for another 50 minutes, kept at this temperature for 110 minutes, and then cooled to 200°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0119] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 350°C for 50 minutes and kept at this temperature for 110 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 200°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0120] Example 17

[0121] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 25 mm and a thickness of 24 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0122] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0123] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0124] Example 18

[0125] In this embodiment, a magnetic core wound with a 1K107B ribbon having a width of 25 mm and a thickness of 24 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 44 mm, the inner diameter was 19 mm, and the height was 25 mm. The core was heated to 430° C. for 50 minutes under a vacuum of -0.11 MPa, held at that temperature for 50 minutes, then heated to 480° C. for 70 minutes, held at that temperature for 70 minutes, and then cooled to 300° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0126] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.11 MPa, the temperature was raised to 430°C for 70 minutes, kept at this temperature for 50 minutes, then raised to 490°C for 50 minutes, kept at this temperature for 80 minutes, and then raised to 610°C for another 70 minutes, kept at this temperature for 130 minutes, and then cooled to 300°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0127] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 500°C for 70 minutes and kept at this temperature for 130 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 300°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0128] Example 19

[0129] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 12 mm and a thickness of 14 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 2.1 mm, the inner diameter was 15.2 mm, and the height was 12 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, and then heated to 470° C. for 60 minutes. After holding at that temperature for 60 minutes, the core was cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0130] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0131] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0132] Example 20

[0133] In this embodiment, a magnetic core wound with a 1K107B strip having a width of 12 mm and a thickness of 16 μm was placed in an annealing furnace. The outer diameter of the magnetic core was 2.1 mm, the inner diameter was 15.2 mm, and the height was 12 mm. The core was heated to 420° C. for 40 minutes under a vacuum of -0.1 MPa, held at that temperature for 40 minutes, then heated to 470° C. for 60 minutes, held at that temperature for 60 minutes, and then cooled to 250° C. in the annealing furnace. The iron-based amorphous alloy magnetic core was then removed from the annealing furnace and cooled to room temperature under natural conditions.

[0134] The iron-based amorphous alloy core was placed back into the annealing furnace, and under a vacuum of -0.1 MPa, the temperature was raised to 420°C for 60 minutes, kept at this temperature for 40 minutes, then raised to 480°C for 40 minutes, kept at this temperature for 70 minutes, and then raised to 580°C for another 60 minutes, kept at this temperature for 120 minutes, and then cooled to 250°C in the annealing furnace. The iron-based amorphous alloy core was then taken out of the annealing furnace and cooled to room temperature under natural conditions.

[0135] The iron-based amorphous alloy core was placed back into the annealing furnace and magnetized under nitrogen protection. The temperature was first raised to 425°C for 60 minutes and kept at this temperature for 120 minutes. The heating power of the annealing furnace was then turned off. The core was taken out of the furnace when the temperature cooled to 250°C and cooled to room temperature under natural conditions to obtain the target iron-based amorphous alloy core.

[0136] Please refer to Table 1 below, which shows the magnetic permeabilities of the magnetic cores obtained by the annealing processes of the above-mentioned embodiments 1 to 20 of the present invention and the magnetic cores obtained by the traditional annealing process, mainly sampling the magnetic cores at the frequency points of 10KHz and 100KHz.

[0137] Table 1:

[0138]

[0139] As can be seen from the table, for the same magnetic core, after undergoing the annealing process of the present application and the traditional annealing process, the magnetic permeability of the magnetic core at a frequency point of 10KHz can be increased by 20-30%, and the magnetic permeability at a frequency point of 100KHz can be increased by 8-12%. In addition, when the frequency point of the magnetic core is 10KHz, the thicker the strip thickness of the magnetic core, the higher the magnetic permeability; when the frequency point of the magnetic core is 100KHz, the thicker the strip thickness of the magnetic core, the lower the magnetic permeability; when the strip thickness is the same and the outer diameter and inner diameter of the magnetic core are smaller, the magnetic permeability is higher. For details, please refer to Table 2 below, which shows a comparison table of hysteresis loop tests of the magnetic core obtained by the annealing process of the above-mentioned embodiment 14 of the present invention and the magnetic core obtained by the traditional annealing process. Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 as well as Figure 5 , Figure 1 : is a test graph of the magnetic permeability of the magnetic core obtained by the annealing process of the fourteenth embodiment of the present invention and the magnetic permeability of the magnetic core obtained by the traditional annealing process, Figure 2 and Figure 3 is a hysteresis loop diagram of the magnetic core obtained by the annealing process of the fourteenth embodiment of the present invention, Figure 4 and Figure 5 1 is a hysteresis loop diagram of a magnetic core made of the same material and size as in the fourteenth embodiment of the present invention but obtained by a traditional annealing process.

[0140] Table 2:

[0141]

[0142] Please refer to Table 3 below, which is a comparison table of hysteresis loop tests of the magnetic core obtained by the annealing process of the above-mentioned embodiment 19 of the present invention and the magnetic core obtained by the traditional annealing process.

[0143] Table 3:

[0144]

[0145] It can be seen from Tables 2 and 3 that the μi(k) and μm(k) of the magnetic cores obtained by the process of the present application are greater than those of the magnetic cores obtained by the traditional process, indicating an improvement in magnetic permeability, while the Hc(A / m) of the magnetic cores obtained by the process of the present application is less than that of the magnetic cores obtained by the traditional process, indicating a decrease in hysteresis loss. In summary, the performance of the magnetic cores obtained by the process of the present application is significantly improved.

[0146] Please refer to Tables 4 and 5 below. Table 4 compares the inductance of magnetic cores after undergoing a conventional annealing process, and Table 5 compares the inductance of magnetic cores after undergoing an annealing process according to Example 19 of the present invention. Both cores were wound using 1K107B tape with a 12mm width and a 14μm thickness. The cores had an outer diameter of 2.1mm, an inner diameter of 15.2mm, and a height of 12mm. Specifically, the cores from the two processes were placed in an oven at 155°C for 1000 hours, then removed and cooled at room temperature for 24 hours before testing.

[0147] Table 4:

[0148]

[0149] Table 5:

[0150]

[0151] As can be seen from Tables 4 and 5, after the magnetic core undergoes the annealing process of Example 19 of the present invention and is baked, the average values of the change rates of the inductance at the frequency points of 10 kHz and 100 kHz are -7.86% and -8.49%, respectively. However, after the magnetic core undergoes the traditional annealing process and is baked, the average values of the change rates of the inductance at the frequency points of 10 kHz and 100 kHz are -15.79% and -9.46%, respectively. It can be seen that the high-temperature stability of the magnetic core treated by the annealing process adopted by the present invention is better than that treated by the traditional annealing process, especially at a frequency point of 10 kHz.

[0152] In summary, the present invention relates to an annealing process for an iron-based amorphous alloy magnetic core and an iron-based amorphous alloy magnetic core. The method repeats the process of heating, keeping warm, re-heating, re-keeping warm and cooling the iron-based amorphous alloy magnetic core twice, wherein the parameters in the heating process and the keeping warm process are different. In addition, under nitrogen protection, during the magnetization treatment, the heating, keeping warm and cooling processes are carried out in sequence to finally complete the annealing process of the entire iron-based amorphous alloy magnetic core and obtain the target iron-based amorphous alloy magnetic core. The iron-based amorphous alloy magnetic core prepared using this method has good magnetic permeability and temperature stability at a frequency point of 1 to 200 kHz.

[0153] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0154] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An annealing process for an iron-based amorphous alloy magnetic core, characterized in that: The following steps are involved: placing the iron-based amorphous alloy core into an annealing furnace, heating it to a first preset temperature within a first preset time under a vacuum state, and performing a first heat preservation treatment at the first preset temperature; After the first heat preservation treatment, the temperature is raised to a second preset temperature according to a second preset time, and a second heat preservation treatment is performed at the second preset temperature; After the second heat preservation treatment, the core is cooled to a third preset temperature in the annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions; placing the iron-based amorphous alloy core back into the annealing furnace, heating it to a fourth preset temperature within a third preset time under a vacuum state, and performing a third heat preservation treatment at the fourth preset temperature; After the third heat preservation treatment, the temperature is raised to a fifth preset temperature according to a fourth preset time, and a fourth heat preservation treatment is performed at the fifth preset temperature; After the fourth heat preservation treatment, the temperature is raised to a sixth preset temperature according to a fifth preset time, and a fifth heat preservation treatment is performed at the sixth preset temperature; After the fifth heat preservation treatment, the core is cooled to the third preset temperature in the annealing furnace, and then the iron-based amorphous alloy core is taken out of the annealing furnace and cooled to room temperature under natural conditions; placing the iron-based amorphous alloy magnetic core back into the annealing furnace and performing magnetization treatment under nitrogen protection to obtain the target iron-based amorphous alloy magnetic core; The vacuum degree under the vacuum state is -0.09 to -0.11 MPa; The first preset time is 30 to 50 minutes, the first preset temperature is 410 to 430° C., and the holding time of the first heat preservation treatment is 30 to 50 minutes; The second preset time is 50 to 70 minutes, the second preset temperature is 460 to 480° C., and the holding time of the second heat preservation treatment is 50 to 70 minutes; The third preset temperature is 200-300°C; The third preset time is 50 to 70 minutes, the fourth preset temperature is 410 to 430° C., and the insulation time of the third insulation treatment is 30 to 50 minutes; The fourth preset time is 30 to 50 minutes, the fifth preset temperature is 470 to 490° C., and the holding time of the fourth heat preservation treatment is 60 to 80 minutes; The fifth preset time is 50 to 70 minutes, the sixth preset temperature is 550 to 610° C., and the insulation time of the fifth insulation treatment is 110 to 130 minutes.

2. The annealing process for the iron-based amorphous alloy core according to claim 1, characterized in that: In the step of placing the iron-based amorphous alloy magnetic core back into the annealing furnace and performing magnetization treatment under nitrogen protection to obtain the target iron-based amorphous alloy magnetic core, the temperature is first raised to a seventh preset temperature according to a sixth preset time, and a sixth insulation treatment is performed at the seventh preset temperature, and then the core is cooled to the third preset temperature in the annealing furnace and then taken out of the furnace, wherein the sixth preset time is 50 to 70 minutes, the seventh preset temperature is 350 to 500°C, and the insulation time of the sixth insulation treatment is 110 to 130 minutes.

3. An iron-based amorphous alloy core, characterized in that: The magnetic core is prepared by the annealing process of the iron-based amorphous alloy core according to any one of claims 1 to 2.

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