Preparation method of composite amorphous or nanocrystalline soft magnetic core

Abstract

The application provides a preparation method of a composite amorphous or nanocrystalline soft magnetic core, comprising the following steps: S1, performing winding treatment on a prepared amorphous or nanocrystalline strip, and then placing the amorphous or nanocrystalline strip into a vacuum furnace while filling nitrogen gas for protection; S2, heating the vacuum furnace to a first preset temperature, filling methane gas, and growing at least one graphene layer on the surface of the amorphous or nanocrystalline strip; and S3, cutting off the methane gas, heating the vacuum furnace to a second preset temperature, and performing heat treatment on the amorphous or nanocrystalline strip to obtain the composite graphene amorphous or nanocrystalline soft magnetic core. The application has the beneficial effects that: after the prepared amorphous or nanocrystalline strip is wound into a magnetic core, special process treatment is performed, a special magnetic core combined with a graphene material is obtained, the toughness of the amorphous or nanocrystalline strip is improved by loading the graphene, the shortcoming of easy brittle fracture is improved, the production yield is improved, and the heat conductivity of the magnetic strip is also improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic materials technology, and in particular to a method for preparing a composite amorphous or nanocrystalline soft magnetic core. Background Technology

[0002] Amorphous nanocrystals are a type of metallic alloy, but due to a special process, they are transformed into an amorphous state, hence the name glass metal. Nanocrystals, on the other hand, are based on amorphous materials but are sized at the nanometer level; amorphous nanocrystals are a hybrid of amorphous and nanocrystals.

[0003] In existing preparation methods, after conventional heat treatment of amorphous or nanocrystalline ribbons, this heat treatment cannot fully utilize the electromagnetic properties that amorphous or nanocrystalline ribbons should have. Moreover, it will make the ribbon toughness worse and its brittleness stronger, resulting in severe core shedding and affecting the core performance. Summary of the Invention

[0004] To address the above technical problems, this invention provides a method for preparing composite amorphous or nanocrystalline soft magnetic cores.

[0005] The technical problem solved by this invention can be achieved by the following technical solutions:

[0006] A method for preparing a composite amorphous or nanocrystalline soft magnetic core, comprising:

[0007] Step S1: The pre-made amorphous or nanocrystalline ribbon is wound and then placed in a vacuum furnace, while nitrogen is introduced for protection.

[0008] Step S2: Heat the vacuum furnace to a first preset temperature, fill it with methane gas, and grow at least one layer of graphene on the surface of the amorphous or nanocrystalline ribbon.

[0009] Step S3: Cut off the methane gas and heat the vacuum furnace to a second preset temperature to heat treat the amorphous or nanocrystalline ribbon to obtain an amorphous or nanocrystalline soft magnetic core of composite graphene.

[0010] Preferably, in step S2, the at least one graphene layer is grown using chemical vapor deposition.

[0011] Preferably, in step S2, plasma or laser-assisted technology is used simultaneously while growing the at least one graphene layer.

[0012] Preferably, in step S2, the first preset temperature is 300℃~1100℃.

[0013] Preferably, in step S2, the thickness of the graphene layer is 0.10 nm to 10 nm.

[0014] Preferably, in step S2, the second preset temperature is 500℃~1200℃.

[0015] Preferably, in step S3, the amorphous or nanocrystalline ribbon is subjected to heat treatment, specifically including:

[0016] The amorphous or nanocrystalline ribbon is subjected to stress-relief heat treatment.

[0017] The advantages or beneficial effects of the technical solution of this invention are as follows:

[0018] This invention involves winding prepared amorphous or nanocrystalline ribbons into magnetic cores and then subjecting them to a special process to obtain a special magnetic core composited with graphene material. By loading graphene, the toughness of the amorphous or nanocrystalline ribbons is improved, mitigating their tendency to crack easily and increasing production yield. At the same time, the thermal conductivity of the magnetic ribbons is also improved, broadening their application areas. Attached Figure Description

[0019] Figure 1 This is a schematic flowchart illustrating the preparation method of a composite amorphous or nanocrystalline soft magnetic core in a preferred embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0023] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a method for preparing a composite amorphous or nanocrystalline soft magnetic core is provided, such as... Figure 1 As shown, it includes:

[0024] Step S1: The pre-made amorphous or nanocrystalline ribbon is wound and then placed in a vacuum furnace, while nitrogen is introduced for protection.

[0025] Step S2: Heat the vacuum furnace to a first preset temperature, fill it with methane gas, and grow at least one layer of graphene on the surface of the amorphous or nanocrystalline ribbon.

[0026] Step S3: Cut off the methane gas and heat the vacuum furnace to a second preset temperature to heat treat the amorphous or nanocrystalline ribbon to obtain an amorphous or nanocrystalline soft magnetic core of composite graphene.

[0027] Specifically, in this embodiment, firstly, the pre-fabricated amorphous or nanocrystalline ribbon is wound, and then the wound magnetic core is placed in a vacuum furnace and protected with nitrogen. When the temperature inside the furnace reaches a first preset temperature, methane gas is introduced, and one or more layers of graphene are grown on the surface of the amorphous or nanocrystalline ribbon using chemical vapor deposition (CVD). Then, the methane gas is cut off, and the furnace temperature is raised to a second preset temperature to perform stress-relieving heat treatment on the amorphous or nanocrystalline ribbon. This invention improves the toughness of the amorphous or nanocrystalline magnetic material by adding a special process to grow one or more layers of graphene on the surface of the ribbon during the heat treatment process, thereby mitigating the inherent brittleness of the material and improving the thermal conductivity of the magnetic ribbon, thus broadening its environmental impact.

[0028] In a preferred embodiment, in step S1, the amorphous or nanocrystalline ribbon can be wound into different shapes.

[0029] Specifically, considering the large size of amorphous or nanocrystalline ribbons, which makes direct graphene growth difficult, this embodiment first winds the amorphous or nanocrystalline ribbon, and then grows graphene on the resulting magnetic core. Furthermore, the amorphous or nanocrystalline ribbon can be wound into different shapes as needed. For example, a ring-shaped magnetic core can be formed.

[0030] In a preferred embodiment, in step S2, at least one graphene layer is grown using chemical vapor deposition.

[0031] Specifically, in this embodiment, one or more layers of graphene are grown on amorphous or nanocrystalline ribbon using chemical vapor deposition, so that the grown graphene can uniformly cover both sides of the ribbon.

[0032] It should be noted that if other processes (such as coating processes) are used to grow graphene, the resulting graphene thickness may be too thick. In this case, a removal process (such as etching process) is required to remove the excess graphene. However, due to the brittleness of amorphous or nanocrystalline ribbons, the removal of excess graphene may damage the amorphous or nanocrystalline ribbons, reducing product yield.

[0033] In a preferred embodiment, in step S2, plasma or laser-assisted technology is used simultaneously while growing at least one graphene layer.

[0034] Specifically, in this embodiment, while growing the graphene layer using the CVD method, plasma or laser-assisted technology can be applied simultaneously to reduce the deposition temperature.

[0035] Furthermore, the graphene layer growth process and the heat treatment process of conventional amorphous or nanocrystalline ribbons are carried out in the same vacuum furnace, requiring only the adjustment of different temperature ranges.

[0036] In a preferred embodiment, in step S2, the first preset temperature is 300℃~1100℃.

[0037] In a preferred embodiment, in step S2, the second preset temperature is 500℃~1200℃.

[0038] In a preferred embodiment, in step S2, the thickness of the graphene layer is 0.10 nm to 10 nm.

[0039] Specifically, if the thickness of the graphene layer is too small, it will not provide sufficient protection; if the thickness is too large, it will cause the graphene to turn into graphite, thereby changing its properties and affecting the performance of the magnetic core.

[0040] In this embodiment, the total thickness of the grown graphene is 0.10 nm to 10 nm. If the thickness is less than 0.10 nm, it will not effectively improve the toughness of the amorphous or nanocrystalline ribbon. If the thickness is greater than 10 nm, it will change its characteristics, making it unable to achieve the effect of improving the toughness of the ribbon, affecting the manufacturing process and yield, and affecting product performance.

[0041] In a preferred embodiment, step S3 involves heat treatment of the amorphous or nanocrystalline ribbon, specifically including:

[0042] Stress-relieving heat treatment is applied to amorphous or nanocrystalline ribbons.

[0043] Specifically, in this embodiment, the residual stress in the prepared composite amorphous or nanocrystalline soft magnetic core can be removed through heat treatment, while the toughness and stability of the amorphous or nanocrystalline strip are improved.

[0044] The present invention also provides a composite amorphous or nanocrystalline soft magnetic core, which is prepared by the method described above for preparing a composite amorphous or nanocrystalline soft magnetic core.

[0045] The above technical solution has the following advantages or beneficial effects: After the prepared amorphous or nanocrystalline ribbon is wound into a magnetic core, it is then subjected to a special process to obtain a special magnetic core composite with graphene material. By loading graphene, the toughness of the amorphous or nanocrystalline ribbon is improved, the disadvantage of easy cracking is mitigated, the production yield is increased, and the thermal conductivity of the magnetic ribbon is also improved, thus broadening its application fields.

[0046] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A method for preparing a composite amorphous or nanocrystalline soft magnetic core, characterized in that, include: Step S1: The pre-made amorphous or nanocrystalline ribbon is wound to obtain a magnetic core, which is then placed in a vacuum furnace and filled with nitrogen for protection. Step S2: Heat the vacuum furnace to a first preset temperature, fill it with methane gas, and grow at least one graphene layer on the surface of the magnetic core obtained after winding; in step S2, the thickness of the graphene layer is 0.10 nm to 10 nm. Step S3: Cut off the methane gas and heat the vacuum furnace to a second preset temperature to heat treat the magnetic core and obtain an amorphous or nanocrystalline soft magnetic core of composite graphene.

2. The method for preparing the composite amorphous or nanocrystalline soft magnetic core according to claim 1, characterized in that, In step S2, the at least one graphene layer is grown using chemical vapor deposition.

3. The method for preparing the composite amorphous or nanocrystalline soft magnetic core according to claim 1, characterized in that, In step S2, plasma or laser-assisted technology is used simultaneously while growing the at least one graphene layer.

4. The method for preparing the composite amorphous or nanocrystalline soft magnetic core according to claim 1, characterized in that, In step S2, the first preset temperature is 300℃~1100℃.

5. The method for preparing the composite amorphous or nanocrystalline soft magnetic core according to claim 1, characterized in that, In step S2, the second preset temperature is 500℃~1200℃.

6. The method for preparing the composite amorphous or nanocrystalline soft magnetic core according to claim 1, characterized in that, In step S3, the amorphous or nanocrystalline ribbon is subjected to heat treatment, specifically including: The amorphous or nanocrystalline ribbon is subjected to stress-relief heat treatment.

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