Experimental device and experimental method for improving magnetic performance of magnetic nano-chain composite material

Abstract

The invention discloses an experimental device and an experimental method for improving the magnetic performance of a magnetic nano-chain composite material, and belongs to the technical field of wave-absorbing material preparation. The experimental device comprises a heating box used for heating the magnetic nano-chain composite material and a magnet assembly used for magnetizing the magnetic nano-chain composite material. An air inlet and an air outlet are formed in the heating box; the magnet assembly comprises a first magnet and a second magnet, and the first magnet and the second magnet are oppositely arranged on the two sides of the heating box. The experimental device for improving the magnetic performance of the magnetic nano-chain composite material can be used for treating the magnetic nano-chain composite material; when the experimental device is applied to treatment of the magnetic nano-chain composite material, the cost is low, the treatment steps are simple, the large demand of engineering for wave-absorbing materials can be met, and the treated magnetic nano-chain composite material can show excellent absorption performance in a wider frequency band, and is thinner and wider in absorption frequency band.

Description

Technical Field

[0001] The present invention relates to the technical field of wave-absorbing material preparation, and in particular to an experimental device and an experimental method for improving the magnetic properties of a magnetic nanochain composite material. Background Art

[0002] With the continuous advancement of science and technology, electromagnetic wave absorbing materials are increasingly being used in industrial production, defense and military fields, and other fields, playing a vital role in ensuring national security and promoting efficient production. However, the complex and ever-changing application environment requires the rapid development of electromagnetic wave absorbing materials in the direction of thinner thickness and wider absorption bandwidth.

[0003] Magnetic nanochain composites exhibit excellent microwave absorption properties due to their unique electromagnetic properties, making them a high-performance microwave absorbing material. Magnetic nanochain composites typically consist of nanoscale particles or fibers forming a micron-sized chain structure, with sizes generally ranging from 1 to 100 microns. They are prepared by combining magnetic nanochain materials (such as ferrites and metal alloys) with non-magnetic materials (such as polymers and ceramics) through a composite process. Their nanochain structure effectively enhances multiple reflections and losses of electromagnetic waves within the material, thereby improving microwave absorption efficiency. Furthermore, by designing a multiphase composite structure, magnetic nanochain composites can achieve efficient microwave absorption over a wide frequency range. Their low density and tunable electromagnetic parameters suggest the potential for broadband microwave absorption at thinner thicknesses. However, the low magnetic permeability of magnetic nanochain composites significantly affects their impedance matching capabilities, limiting the full utilization of their electromagnetic loss properties and hindering their excellent absorption performance over a wider frequency range. Therefore, increasing the magnetic permeability of magnetic composites is crucial for improving their microwave absorption performance. In existing research, magnetic optimization of magnetic composite materials generally refers to the directional arrangement of magnetic materials. It is an important technology to improve their electromagnetic properties. It mainly achieves the orderly arrangement of one-dimensional / two-dimensional magnetic materials through methods such as freeze-drying, magnetic field, flow field and electric field, thereby improving their response to electromagnetic waves.

[0004] However, the directional arrangement of existing magnetic materials has limited scope for directional control. Once a one-dimensional or two-dimensional material reaches full order, its magnetism cannot be further improved. There is an upper limit to the magnetic enhancement, and further improvement is impossible. Furthermore, the directional operation of existing magnetic composite materials is relatively complex, requiring the regulation of the applied magnetic field strength. The directional operation is also very sensitive to the magnetic field strength: too high a strength will cause particle agglomeration and delamination, while too low a strength will not achieve the purpose of orientation. It is also necessary to control the viscosity of the matrix (such as polyimide), etc., making the experimental steps relatively complicated. Summary of the Invention

[0005] The invention discloses an experimental device and an experimental method for improving the magnetic properties of a magnetic nanochain composite material, so as to solve the above technical problems in the prior art.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions: In a first aspect, the present application provides an experimental device for improving the magnetic properties of a magnetic nanochain composite material, comprising a heating box for heating the magnetic nanochain composite material and a magnet assembly for magnetizing the magnetic nanochain composite material; wherein, The heating box is provided with an air inlet and an exhaust port; The magnet assembly includes a first magnet and a second magnet. The first magnet and the second magnet are arranged on two sides of the heating box opposite to each other, and the magnetic poles of the first magnet and the second magnet on the opposite side are opposite.

[0007] Furthermore, the experimental device also includes a protective outer frame arranged on the outside of the heating box, and the first magnet and the second magnet are both arranged in the protective outer frame.

[0008] Furthermore, the first magnet and the second magnet are both permanent magnets or electromagnets.

[0009] Furthermore, when the first magnet and the second magnet are both permanent magnets, the first magnet and the second magnet are both planar magnets; And / or, when the first magnet and the second magnet are both permanent magnets, the first magnet and / or the second magnet are connected to the protective outer frame via a spacing adjustment component.

[0010] Furthermore, the spacing adjustment assembly includes a first mounting frame and a first spacing adjustment bolt, the first magnet is mounted on the first mounting frame, and the first mounting frame is connected to the inner side of the protective outer frame through the first spacing adjustment bolt; a first internally threaded hole is formed on the protective outer frame, and the first internally threaded hole is an internally threaded hole; the first spacing adjustment bolt includes a head and a screw, and an end of the screw away from the head has an external thread that adapts to the internal thread in the first internally threaded hole, the head of the first spacing adjustment bolt is located on the outer side of the protective outer frame, and the screw of the first spacing adjustment bolt passes through the first internally threaded hole on the first mounting frame and is threadedly connected to the first internally threaded hole; And / or, the spacing adjustment assembly also includes a second mounting frame and a second spacing adjustment bolt, the second magnet is mounted on the second mounting frame, and the second mounting frame is connected to the inner side of the protective outer frame through the second spacing adjustment bolt; a second internal threaded hole is provided on the protective outer frame, and the second internal threaded hole is an internal threaded hole; the second spacing adjustment bolt includes a head and a screw, and the end of the screw away from the head has an external thread that is adapted to the internal thread in the second internal threaded hole, the head of the second spacing adjustment bolt is located on the outside of the protective outer frame, and the screw of the second spacing adjustment bolt passes through the second internal threaded hole on the second mounting frame and is threadedly connected to the second internal threaded hole.

[0011] Furthermore, when the spacing adjustment assembly includes a first mounting frame, first slide bars are provided on both sides of the first mounting frame, and first slide grooves slidably engaged with the first slide bars are provided on the inner wall of the protective outer frame at positions corresponding to the first slide bars; And / or, when the spacing adjustment component includes a second mounting frame, second sliding bars are provided on both sides of the second mounting frame; and the inner wall of the protective outer frame is provided with a second sliding groove that slidably cooperates with the second sliding bar at a position corresponding to the second sliding bar.

[0012] Furthermore, the heating box includes a box body and a heating component for heating the box body; wherein, The box body includes a lower box body with an open upper end and a cover body adapted to the open end of the lower box body, the cover body and the lower box body are detachably connected, and the cover body and the lower box body are sealed; The heating component is arranged on the lower side of the lower box body.

[0013] Furthermore, the heating box also includes a pressing block for applying pressure to the magnetic nanochain composite material experimental sample in the lower box to make it close to the bottom surface of the lower box, and the pressing block is adapted to the open end of the box.

[0014] Furthermore, the material of the box includes any one of copper, silver and gold; And / or, the material of the pressing block includes any one of copper, silver and gold; And / or, the material of the protective outer frame includes austenitic stainless steel.

[0015] Furthermore, the first magnet and the second magnet are both planar magnets, and the magnetic poles of the first magnet and the second magnet on opposite sides are opposite.

[0016] In a second aspect, the present application provides an experimental method for improving the magnetic properties of a magnetic nanochain composite material, which is performed using the above-mentioned experimental apparatus and includes the following steps: S1. First, adjust the magnetic field strength generated by the magnet assembly to 0.1-0.5 Tesla, then place the experimental sample of the magnetic nanochain composite material in a heating box; then, introduce inert gas into the heating box; S2. Under the protection of inert gas, in a magnetic field strength of 0.1 to 0.5 Tesla, raise the temperature in the heating box to 400°C to 600°C at a heating rate of 5°C / min to 20°C / min, and then keep the temperature at 400°C to 600°C for 30 min to 60 min; S3. After the insulation is completed, the heating box stops heating, and the inert gas is stopped after the experimental sample cools down to room temperature naturally.

[0017] Furthermore, in step S2, the magnetic field strength is 0.2 to 0.4 Tesla; And / or, the heating is carried out at a heating rate of 8°C / min to 15°C / min to a temperature of 400°C to 550°C; And / or, the heat preservation is carried out at a temperature of 400° C. to 550° C. for 40 min to 50 min.

[0018] Furthermore, in step S2, the inert gas includes any one of helium and argon.

[0019] The technical solution adopted by the present invention can achieve the following beneficial effects: The experimental device for improving the magnetic properties of magnetic nanochain composite materials in this application can be used to treat magnetic nanochain composite materials, which can effectively improve the magnetic permeability of magnetic nanochain composite materials and thus optimize their electromagnetic wave absorption performance; it can be used for small experiments in R&D laboratories, and can also be used for small-scale production. It also provides new ideas for the research and development of equipment for industrial mass production of magnetic nanochain composite materials. The heating box in the experimental device of this application is used to heat and insulate the magnetic nanochain composite material, and the magnet assembly is used to magnetize the magnetic nanochain composite material. Specifically, the experimental device in this application has the following advantages: ① Simple structure and low cost. Not only is the initial investment cost low, but the later repair and maintenance costs are also very low. It complies with the principle of economic saving, is conducive to the stable development of the enterprise, and is also conducive to the smooth development of related R&D experiments by enterprises or universities. ② The experimental device in this application is used to treat the magnetic nanochain composite material. The processing steps are simple and easy to operate, and the operating requirements for the staff are not high. First, when the experimental device in this application is used to optimize the magnetic properties of the magnetic nanochain composite material, it is not sensitive to the requirements of the magnetic field, and the magnetic field control is simpler. Furthermore, when the experimental device in this application is used to optimize the magnetic properties of the magnetic nanochain composite material, there is no need to control the viscosity of the matrix (such as polyimide). The nanochains can be directly mixed with the matrix. Regardless of how the nanochains are distributed, the experimental device in this application can be used to optimize the magnetic properties of the magnetic nanochain composite material. ③ The experimental device in this application is used to treat the magnetic nanochain composite material, which enhances the magnetic response ability of the magnetic nanochain composite material to electromagnetic waves. The treated magnetic nanochain composite material can exhibit excellent absorption performance in a wider frequency band, has the advantages of thinner thickness and wider absorption band, and achieves the improvement of magnetic permeability and wave absorption performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of Example 1 of the present application; Figure 2 is a top view of Example 1 of the present application; Figure 3 yes Figure 2 Cross-sectional view of AA; Figure 4 yes Figure 2 Left view of; Figure 5 This is a schematic diagram of the state in which the magnetic nanochain composite material is loaded into the experimental device in Example 1 of the present application; Figure 6 This is a schematic structural diagram of the first mounting frame of the experimental device in Example 1 of the present application being slidably connected to the protective outer frame; Figure 7 This is a structural diagram of another embodiment of the experimental device in Example 1 of the present application; Figure 8 This is a structural diagram of another embodiment of the experimental device in Example 1 of the present application; Figure 9 This is a schematic diagram of the placement of the experimental device in Example 1 of the present application; Figure 10 This is a schematic diagram of the temperature sensor installation position in Example 1 of the present application; Figure 11 yes Figure 10 Rear view; Figure 12 is a comparison of the complex magnetic permeability of sample a (FN) and sample I (FN-MA) in the X-band; Figure 13 is a comparison of the VSM curves of sample a (FN) and sample I (FN-MA); Figure 14 The following is a comparison chart of the absorption performance (absorption bandwidth and minimum reflection loss) of sample a (FN) and sample I (FN-MA) obtained by calculation based on the complex dielectric constant and complex magnetic permeability.

[0022] In the figure: 10, box body; 101, lower box body; 102, cover body; 103, air inlet; 104, exhaust port; 20, first magnet; 201, first south pole; 202, first north pole; 30, second magnet; 301, second south pole; 302, second north pole; 40, first mounting frame; 50, second mounting frame; 60, heating assembly; 70, protective outer frame; 701, first guard plate; 702, second guard plate; 703, Third guard plate; 704, fourth guard plate; 80, first spacing adjustment bolt; 801, first head; 802, first screw; 90, second spacing adjustment bolt; 901, second head; 902, second screw; 100, pressing block; 1001, handle; 110, magnetic nanochain composite material; 120, first slide; 130, second slide; 140, temperature sensor; 150, first table; 160, second table. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0024] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0025] The following is combined with Figures 1 to 14 , the experimental device and experimental method for improving the magnetic properties of magnetic nanochain composite materials provided in this application are described in detail through specific embodiments and their application scenarios.

[0026] 1. Implementation Example 1: See Figures 1-11 The present application provides an experimental device for improving the magnetic properties of a magnetic nanochain composite material, comprising a heating box for heating the magnetic nanochain composite material 110 and a magnet assembly for magnetizing the magnetic nanochain composite material 110; wherein, The heating box is provided with an air inlet 103 and an exhaust port 104; The magnet assembly includes a first magnet 20 and a second magnet 30. The first magnet 20 and the second magnet 30 are disposed opposite each other on opposite sides of the heating box, and the magnetic poles of the first magnet 20 and the second magnet 30 on the opposite sides are opposite. Specifically, the first magnet 20 has a first south pole 201 and a first north pole 202; the second magnet 30 has a second south pole 301 and a second north pole 302; the first south pole 201 of the first magnet 20 and the second north pole 302 of the second magnet 30 are disposed opposite each other.

[0027] The experimental device for improving the magnetic properties of the magnetic nanochain composite material in this application can be used to treat the magnetic nanochain composite material 110, which can effectively improve the magnetic permeability of the magnetic nanochain composite material 110, thereby optimizing its electromagnetic wave absorption performance; it can be used for small-scale experiments in R&D laboratories, and can also be used for small-scale production. It also provides new ideas for the development of equipment for industrial mass production of magnetic nanochain composite materials 110. The heating box in the experimental device of this application is used to heat and maintain the magnetic nanochain composite material 110, and the magnet assembly is used to magnetize the magnetic nanochain composite material 110. Specifically, the experimental device in this application has the following advantages: ① Simple structure and low cost. Not only is the initial investment cost low, but the subsequent repair and maintenance costs are also very low, which complies with the principle of economic savings, is conducive to the stable development of enterprises, and is also conducive to enterprises or universities to smoothly carry out related research and development experiments; ② The experimental device in this application is used to process the magnetic nanochain composite material 110. The processing steps are simple and easy to operate, and the operating requirements for the staff are not high; first, when the experimental device in this application is used to optimize the magnetism of the magnetic nanochain composite material 110, it is not sensitive to the magnetic field requirements, and the magnetic field control is simpler; secondly, when the experimental device in this application is used to optimize the magnetism of the magnetic nanochain composite material 110, no adjustment is required. By controlling the viscosity of the matrix (such as polyimide), the nanochains can be directly mixed with the matrix. Regardless of how the nanochains are distributed, the experimental device in this application can be used to optimize the magnetic properties of the magnetic nanochain composite material 110; ③ The experimental device in this application is used to treat the magnetic nanochain composite material 110, which enhances the magnetic response ability of the magnetic nanochain composite material 110 to electromagnetic waves. The treated magnetic nanochain composite material 110 can exhibit excellent absorption performance in a wider frequency band, and has the advantages of thinner thickness and wider absorption band, thereby achieving an improvement in magnetic permeability and wave absorption performance; when the experimental device for improving the magnetic properties of the magnetic nanochain composite material 110 in this application is used for magnetic optimization, the magnetism can be further improved at the upper limit of directional operation.

[0028] In some embodiments, the experimental device also includes a protective outer frame 70 arranged on the outside of the heating box, and the first magnet 20 and the second magnet 30 are both arranged in the protective outer frame 70. It can be understood that when the magnetic nanochain composite material 110 is processed, the temperature is as high as 400-600°C. The protective outer frame 70 can not only be used to fix the first magnet 20 and the second magnet 30 to prevent the first magnet 20 and the second magnet 30 on both sides of the heating box from being tightly attached together due to the magnetic force, but also plays a role in preventing the staff from being burned. Although the first magnet 20 and the second magnet 30 are both arranged in the protective outer frame 70, the setting position needs to be as far away from the outer wall of the heating box as possible. The first magnet 20 and the second magnet 30 work at a lower temperature and have a longer service life.

[0029] In some embodiments, the protective outer frame 70 includes a first guard plate 701, a second guard plate 702, a third guard plate 703, and a fourth guard plate 704 connected in sequence; the first guard plate 701, the second guard plate 702, the third guard plate 703, and the fourth guard plate 704 constitute a rectangular frame, and the two ends of the first guard plate 701 are respectively connected to the second guard plate 702 and the fourth guard plate 704; the two ends of the third guard plate 703 are respectively connected to the second guard plate 702 and the fourth guard plate 704; the connection between the first guard plate 701, the second guard plate 702, the third guard plate 703, and the fourth guard plate 704 can be achieved by welding, or other fixed connection methods; a detachable connection method can also be used.

[0030] In some embodiments, the first magnet 20 and the second magnet 30 are both permanent magnets or electromagnets. It is understandable that the types of the first magnet 20 and the second magnet 30 are not limited to the types disclosed in the existing application, and can also be ordinary magnets, as long as the first magnet 20 and the second magnet 30 can generate the magnetic field strength required for the experiment and can completely cover the range of the magnetic nanochain composite material 110 in the heating box. When the first magnet 20 and the second magnet 30 are both electromagnets, the input current can be accurately controlled by adjusting the DC power supply, thereby adjusting the magnetic field strength to the magnetic field strength required for the experiment.

[0031] In some embodiments, when the first magnet 20 and the second magnet 30 are both permanent magnets, the first magnet 20 and the second magnet 30 are both planar magnets.

[0032] In some embodiments, when the first magnet 20 and the second magnet 30 are both permanent magnets, the first magnet 20 and the second magnet 30 each include at least one sub-magnet.

[0033] In some embodiments, when the first magnet 20 and the second magnet 30 are both permanent magnets, the first magnet 20 includes one sub-magnet or multiple sub-magnets; the second magnet 30 includes one sub-magnet or multiple sub-magnets; when the first magnet 20 and the second magnet 30 both include multiple sub-magnets. It can be understood that the coverage of the magnetic field generated between the first magnet 20 and the second magnet 30 needs to be able to magnetize all the magnetic nanochain composite materials 110 in the heating box. The number of sub-magnets can be adjusted according to the volume of the heating box, as long as the coverage of the magnetic field generated between the first magnet 20 and the second magnet 30 can be well magnetized for all the magnetic nanochain composite materials 110 in the heating box, and at the same time, the first magnet 20 and the second magnet 30 need to generate the magnetic field strength required for the experiment, thereby increasing the adjustability of the experimental device in this application.

[0034] The first magnet 20 and the second magnet 30 of the experimental device in this application are preferably permanent magnets. This enhances the universality, convenience, and adjustability of the experimental device in this application. Of course, the first magnet 20 and the second magnet 30 can also be replaced with a combination of multiple sub-magnets or electromagnets as needed. Furthermore, corresponding supporting components can be designed based on the replacement of the first magnet 20 and the second magnet 30.

[0035] In some embodiments, when both the first magnet 20 and the second magnet 30 are permanent magnets, the first magnet 20 and / or the second magnet 30 are connected to the protective outer frame 70 via a spacing adjustment assembly. It is understood that either one of the first magnet 20 and the second magnet 30, or both, can be moved, and the spacing between the first magnet 20 and the second magnet 30 can be adjusted, that is, the magnetic field strength can be adjusted.

[0036] In some embodiments, the spacing adjustment assembly includes a first mounting frame 40 and a first spacing adjustment bolt 80, the first magnet 20 is mounted on the first mounting frame 40, and the first mounting frame 40 is connected to the inner side of the protective outer frame 70 through the first spacing adjustment bolt 80; a first internal threaded hole is provided on the first guard plate 701 of the protective outer frame 70; the first spacing adjustment bolt 80 includes a first head 801 and a first screw 802, the first screw 802 has an external thread adapted to the internal thread in the first internal threaded hole at a position corresponding to the first internal threaded hole, the first head 801 of the first spacing adjustment bolt 80 is located on the outer side of the protective outer frame 70, and the first The first screw 802 of the spacing adjustment bolt 80 passes through the first internally threaded hole on the first guard plate 701 and is threadedly connected to the first internally threaded hole. The end of the first screw 802 of the first spacing adjustment bolt 80 away from the first head 801 is rotatably connected to the first mounting frame 40, such as through a bearing connection. Since the first head 801 of the first spacing adjustment bolt 80 is located outside the protective outer frame 70, when the first spacing adjustment bolt 80 is rotated, the external thread on its first screw 802 engages with the internal thread in the first internally threaded hole, and the first mounting frame 40 moves closer to or away from the second mounting frame 50. Therefore, the movement of the first mounting frame 40 can be achieved by rotating the first spacing adjustment bolt 80. It can be understood that when the first spacing adjustment bolt 80 is rotated to move the first mounting frame 40, the distance between the first magnet 20 and the second magnet 30 can be adjusted, that is, the magnetic field strength during the experiment can be adjusted. Of course, the structure of the spacing adjustment assembly is not limited to the structure disclosed in the embodiments of the present application, and can also be other distance adjustment structures, as long as the distance between the first magnet 20 and the second magnet 30 can be adjusted.

[0037] In some embodiments, the spacing adjustment assembly includes a second mounting frame 50 and a second spacing adjustment bolt 90, the second magnet 30 is mounted on the second mounting frame 50, and the second mounting frame 50 is connected to the inner side of the protective outer frame 70 through the second spacing adjustment bolt 90; a second internal threaded hole is opened on the third guard plate 703 of the protective outer frame 70; the second spacing adjustment bolt 90 includes a second head 901 and a second screw 902, the second screw 902 has an external thread adapted to the internal thread in the second internal threaded hole at a position corresponding to the second internal threaded hole, the second head 901 of the second spacing adjustment bolt 90 is located on the outer side of the protective outer frame 70, the second screw 902 of the second spacing adjustment bolt 90 passes through the second internal threaded hole on the third guard plate 703 and is adapted to the second internal threaded hole The two internal threaded holes are threadedly connected, and the end of the second screw 902 of the second spacing adjustment bolt 90 away from the second head 901 is rotatably connected to the second mounting frame 50, such as through a bearing connection; since the second head 901 of the second spacing adjustment bolt 90 is located on the outside of the protective outer frame 70, when the second spacing adjustment bolt 90 is rotated, the external thread on its second screw 902 cooperates with the internal thread in the second internal threaded hole, and the second mounting frame 50 will move closer to or away from the first mounting frame 40. Therefore, the movement of the second mounting frame 50 can be achieved by rotating the second spacing adjustment bolt 90; it can be understood that when the second mounting frame 50 is moved by rotating the second spacing adjustment bolt 90, the distance between the first magnet 20 and the second magnet 30 can also be adjusted, that is, the magnetic field strength during the experiment can be adjusted. Of course, the structure of the spacing adjustment component is not limited to the structure disclosed in the embodiment of the present application, and can also be other distance adjustment structures, as long as the distance adjustment between the first magnet 20 and the second magnet 30 can be achieved.

[0038] In some embodiments, there are four first internal threaded holes, and the four first internal threaded holes are respectively opened on the four corners of the first guard plate 701; there are four second internal threaded holes, and the four second internal threaded holes are respectively opened on the four corners of the third guard plate 703.

[0039] In some embodiments, the spacing adjustment assembly includes a first mounting frame 40 and a first spacing adjustment bolt 80, the first magnet 20 is mounted on the first mounting frame 40, and the first mounting frame 40 is connected to the inner side of the protective outer frame 70 through the first spacing adjustment bolt 80; a third internal threaded hole is opened on the first mounting frame 40; the first spacing adjustment bolt 80 includes a first head 801 and a first screw 802, the first screw 802 has an external thread adapted to the internal thread in the first internal threaded hole at a position corresponding to the first internal threaded hole, the first head 801 of the first spacing adjustment bolt 80 is located on the outside of the protective outer frame 70, the first screw 802 of the first spacing adjustment bolt 80 is rotatably connected to the first guard plate 701, and the first screw 802 passes through the third internal threaded hole on the first mounting frame 40 and is threadedly connected to the third internal threaded hole, and the rotational connection between the first screw 802 of the first spacing adjustment bolt 80 and the first guard plate 701 can be connected through a bearing. Since the first head 801 of the first spacing adjustment bolt 80 is located outside the protective outer frame 70, when the first spacing adjustment bolt 80 is rotated, the external thread on the first screw 802 engages with the internal thread in the third internal threaded hole, and the first mounting frame 40 moves closer to or further away from the second mounting frame 50. Therefore, the movement of the first mounting frame 40 can be achieved by rotating the first spacing adjustment bolt 80. It can be understood that when the first spacing adjustment bolt 80 is rotated to move the first mounting frame 40, the distance between the first magnet 20 and the second magnet 30 can be adjusted, that is, the magnetic field strength during the experiment can be adjusted.

[0040] In some embodiments, the spacing adjustment assembly includes a second mounting frame 50 and a second spacing adjustment bolt 90, the second magnet 30 is mounted on the second mounting frame 50, and the second mounting frame 50 is connected to the inner side of the protective outer frame 70 through the second spacing adjustment bolt 90; a fourth internal threaded hole is opened on the second mounting frame 50; the second spacing adjustment bolt 90 includes a second head 901 and a second screw 902, the second screw 902 has an external thread adapted to the internal thread in the fourth internal threaded hole at a position corresponding to the fourth internal threaded hole, the second head 901 of the second spacing adjustment bolt 90 is located on the outer side of the protective outer frame 70, the second screw 902 of the second spacing adjustment bolt 90 is rotatably connected to the third guard plate 703, and the second screw 902 passes through the second mounting frame 50 The fourth internal threaded hole on the frame 70 is threadedly connected to the fourth internal threaded hole, and the rotational connection between the second screw 902 of the second spacing adjustment bolt 90 and the third guard plate 703 can be connected by a bearing; since the second head 901 of the second spacing adjustment bolt 90 is located on the outside of the protective outer frame 70, when the second spacing adjustment bolt 90 is rotated, the external thread on the second screw 902 cooperates with the internal thread in the fourth internal threaded hole, and the second mounting frame 50 will move closer to or away from the first mounting frame 40. Therefore, the movement of the second mounting frame 50 can be achieved by rotating the second spacing adjustment bolt 90; it can be understood that when the second mounting frame 50 is moved by rotating the second spacing adjustment bolt 90, the distance between the first magnet 20 and the second magnet 30 can also be adjusted, that is, the magnetic field strength during the experiment can be adjusted.

[0041] In some embodiments, the first mounting frame 40 is a rectangular frame adapted to the first magnet 20; there are four third internal threaded holes, and the four third internal threaded holes are respectively opened on the four corners of the first mounting frame 40; the second mounting frame 50 is a rectangular frame adapted to the second magnet 30; there are four fourth internal threaded holes, and the four fourth internal threaded holes are respectively opened on the four corners of the second mounting frame 50.

[0042] See Figure 6 In some embodiments, first slide bars 120 are provided on both sides of the first mounting frame 40. First slide grooves that slidably engage with the first slide bars 120 are formed on the inner wall of the protective outer frame 70 at positions corresponding to the first slide bars 120. The first slide bars 120 of the first mounting frame 40 are slidably connected within the first slide grooves. It is understood that the provision of the first slide bars 120 and the first slide grooves is intended to better support the first mounting frame 40 and to ensure smoother movement of the first mounting frame 40. Of course, even without the provision of the first slide bars 120 and the first slide grooves, the first mounting frame 40 can still be moved by rotating the first spacing adjustment bolts 80.

[0043] See Figure 7In some embodiments, second slide bars 130 are provided on both sides of the second mounting frame 50; second slots are provided on the inner wall of the protective outer frame 70 at positions corresponding to the second slide bars 130, which slidably engage with the second slide bars 130. The second slide bars 130 of the second mounting frame 50 are slidably connected within the second slots. It is understood that the second slide bars 130 and the second slots are provided to better support the second mounting frame 50 and to ensure smoother movement of the second mounting frame 50. Of course, even without the second slide bars 130 and the second slots, the second mounting frame 50 can still be moved by rotating the second spacing adjustment bolts 90.

[0044] See Figure 8 In some embodiments, first slide bars 120 are provided on both sides of the first installation frame 40, and first slide grooves that slide with the first slide bars 120 are opened on the inner wall of the protective outer frame 70 at positions corresponding to the first slide bars 120; second slide bars 130 are provided on both sides of the second installation frame 50; and second slide grooves that slide with the second slide bars 130 are opened on the inner wall of the protective outer frame 70 at positions corresponding to the second slide bars 130.

[0045] See also Figure 3 、 Figure 4 In some embodiments, the heating box includes a box body 10 and a heating component 60 for heating the box body 10; wherein, The box body 10 includes a lower box body 101 with an open upper end and a cover body 102 adapted to the open end of the lower box body 101; the cover body 102 is detachably connected to the lower box body 101, and the cover body 102 and the lower box body 101 are sealed; The heating assembly 60 is disposed on the lower side of the lower box 101 .

[0046] In some embodiments, the lid 102 and the lower case 101 are connected by a sliding plug-in connection, for example, by providing a positioning slot on the open end of the lower case 101 that mates with the folded edge of the lid 102; alternatively, a snap-fit and bolt connection can be used. Of course, the detachable connection between the lid 102 and the lower case 101 is not limited to the connection method disclosed in this application, and other detachable connection methods may also be used. The connection method between the lid 102 and the lower case 101 is prior art and will not be described in detail in this application.

[0047] In some embodiments, the lid 102 is provided with a high-temperature sealing ring at the position where it contacts the open end of the lower box 101. When the lid 102 is closed on the lower box 101, the high-temperature sealing ring seals the box 10. The material of the high-temperature sealing ring should ensure that the melting point is higher than the experimental temperature. For example, the material of the high-temperature sealing ring can be ceramic fiber, high-silica fiber, etc. The provision of a sealing ring to achieve sealing of the box 10 is prior art and will not be described in detail in this application.

[0048] In some embodiments, the heating assembly 60 includes any one of a PTC heater, a ceramic heater, and an infrared heater. It is understood that the heating assembly 60 is used to heat the heating box, and the heating box heats and insulates the magnetic nanochain composite material 110 placed therein by heat conduction, but it is necessary to avoid the influence of the external magnetic field, such as avoiding the use of electromagnetic induction heaters, DC induction heaters, etc. Of course, the heating assembly 60 is not limited to the heaters disclosed in this application, and other heaters that meet the requirements can also be selected.

[0049] In some embodiments, the heating box further includes a pressing block 100 for applying pressure to the magnetic nanochain composite material 110 in the lower box 101 so that it is close to the bottom surface of the lower box 101, and the pressing block 100 is adapted to the open end of the box 10. It is understandable that since the first magnet 20 and the second magnet 30 will generate an external magnetic field, if the magnetic nanochain composite material 110 is directly placed into the lower box 101, the magnetic nanochain composite material 110 will be adsorbed to the side wall of the lower box 101 under the action of the external magnetic field, and the heating effect will be affected to a certain extent. The setting of the pressing block 100 will apply pressure to the magnetic nanochain composite material 110 and make it close to the bottom surface of the lower box 101, which is conducive to the heating of the magnetic nanochain composite material 110 and the experimental effect will be better.

[0050] In some embodiments, the pressing block 100 is provided with a handle 1001. It is understandable that the provision of the handle 1001 can more conveniently press the pressing block 100 onto the magnetic nanochain composite material 110, and can also more conveniently lift the pressing block 100.

[0051] In some embodiments, the material of the box 10 includes any one of copper, silver and gold; the material of the pressing block 100 includes any one of copper, silver and gold; with respect to the selection of the material of the box 10 and the pressing block 100, it can be understood that, in the process of processing the magnetic nanochain composite material 110, first, it is necessary to satisfy the requirement that the external magnetic field between the first magnet 20 and the second magnet 30 can act on the magnetic nanochain composite material 110 in the lower box 101; second, it is also necessary to transfer heat to the magnetic nanochain composite material 110 in the lower box 101 so that the atoms in the nanochain wave material are excited by heat and generate thermal motion; third, the melting point temperature of the material selected for the box 10 and the pressing block 100 needs to be higher than the processing temperature of the magnetic nanochain composite material 110. Therefore, the material of the box 10 and the pressing block 100 needs to be a non-magnetic metal with good thermal conductivity. The selection of the non-magnetic metal is based on the consideration that it cannot affect the distribution of the external magnetic field between the first magnet 20 and the second magnet 30, and the melting point temperature of the selected metal material is higher than the heating temperature.

[0052] See also Figure 10 and Figure 11 In some embodiments, for controlling the temperature in the heating box, a temperature sensor 140 can be provided on the lower box 101 to monitor the temperature of the magnetic nanochain composite material 110 in the heating box, and then the temperature control is adjusted accordingly by the heating component 60. Of course, a controller is also provided to electrically connect the temperature sensor 140 and the heating component 60 to the controller, so that the temperature can be automatically regulated. Regarding the setting of the temperature sensor 140: for example, a temperature sensor 140 can be provided on each of the opposite sides of the lower box 101 to monitor the temperature of the magnetic nanochain composite material 110 in the heating box. Of course, the number of temperature sensors 140 can be set as needed, more can be set, and they can also be set at different heights of the lower box 101, and can be reasonably set according to the placement height of the magnetic nanochain composite material 110 in the heating box.

[0053] In some embodiments, the protective outer frame 70 is made of austenitic stainless steel. It is understood that the material of the protective outer frame 70 should also be non-magnetic to prevent it from being affected by the external magnetic field generated by the first magnet 20 and the second magnet 30. At the same time, it should have a certain strength to provide a certain degree of protection for the heating box disposed therein.

[0054] In some embodiments, the box body 10 and the pressing block 100 are both made of copper.

[0055] For the installation and placement of the experimental setup in this application, see Figure 9The heating assembly 60 can be placed on the first table 150, and the protective frame 70 can be placed on the second table 160. The height of the second table 160 is higher than that of the first table 150. When installing the experimental device in this application, the heating assembly 60 is first placed on the first table 150, and then the heating box is placed on the heating assembly 60; then the protective frame 70, together with the first magnet 20, the second magnet 30, etc., are placed on the second table 160.

[0056] The magnetic nanochain composite material 110 is processed using the experimental device in this application, including the following steps: S1. Place the Gaussmeter at the center of the bottom of the lower box 101, adjust the distance between the first magnet 20 and the second magnet 30 to adjust the magnetic field strength to the experimental strength, and then take out the Gaussmeter; place the experimental sample of the magnetic nanochain composite material 110 in the lower box 101, press the experimental sample with the pressing block 100, so that the experimental sample fits the bottom of the lower box 101, but it is necessary to leave the position of the air inlet 103 and the exhaust port 104, and the sample a is in block shape, so there are more gaps between the samples a loaded into the lower box 101 to ensure the passage and discharge of inert gas, and then cover the cover 102; the air inlet 103 is connected to the inert gas inlet pipe, the exhaust port 104 is connected to the inert gas exhaust pipe, and the end of the exhaust pipe is immersed in water; inert gas is passed into the heating box to exhaust the air in the box 10; S2. Continue to introduce inert gas until all the air in the box 10 is exhausted and the rate of bubbles appearing in the water is uniform and stable, then start heating, gradually increase the temperature of the box 10, and then keep it warm for a certain period of time; S3. After the insulation is completed, the heating box stops heating. After the experimental sample cools down to room temperature naturally, the inert gas is stopped and the treated experimental sample is taken out.

[0057] 2. Experimental Samples Sample a: FeNi@SiO2 nanochain\PI composite material; The preparation method of sample a specifically comprises the following steps: A1. Preparation of FeNi nanochain materials: A11. Add 80 mL of deionized water to the first reaction container, add 0.00075 mol of FeCl3, 0.00075 mol of NiCl2·6H2O, and 2 g of PVP (K13-18) to the reaction container, dissolve them in 80 mL of deionized water, and stir for 20 min to dissolve FeCl3, NiCl2·6H2O, and PVP (K13-18) in the deionized water to obtain an Fe and Ni salt solution; A12. Dissolve 0.5 g of NaBH4 in 30 mL of deionized water to prepare a NaBH4 solution. A13. Under the induction of an external magnetic field of 3300 Oe, the NaBH4 solution prepared in step A12 was slowly dripped into the Fe and Ni salt solutions in step A11. After the reaction was completed, the black product was collected with a magnet and washed three times with deionized water and anhydrous ethanol respectively. The obtained black product is the FeNi nanochain material; A2. Preparation of FeNi@SiO2 nanochain materials: A21, adding 50 mL of anhydrous ethanol and 10 mL of deionized water to a second reaction container and mixing them evenly, then adding the FeNi nanochain material obtained in step A1 to the second reaction container and mixing them evenly; A22, at a rotation speed of 500 rpm, 2.4 g of concentrated ammonia solution (28 wt %) was added dropwise to the second reaction vessel. After the addition of the concentrated ammonia solution was completed, the reaction was continued with stirring at a stirring rate of 500 rpm for 10 min; A23, adding 2 mL of ethyl orthosilicate to the second reaction vessel at a rotation speed of 300 rpm, and stirring at a stirring rate of 300 rpm for 4 h; A24. After the reaction, the product was collected using a magnet, washed three times with anhydrous ethanol, and dried in a vacuum drying oven at 50°C to obtain FeNi@SiO2 nanochain material. A3. Preparation of FeNi@SiO2 nanochain\PI composite materials A31, the FeNi@SiO2 nanochain material obtained in step A2 and polyimide are mixed uniformly in a mass ratio of 60:40, so that the FeNi@SiO2 nanochain material is uniformly distributed in the polyimide; A32. Heat and cure under vacuum at a curing temperature of 180°C to obtain a bulk FeNi@SiO2 nanochain\PI composite material, which is the magnetic nanochain composite material 110 (sample a).

[0058] 3. Sample Processing Example Example 1-1: The FeNi@SiO2 nanochain\PI composite material (sample a) was treated using the experimental apparatus in Example 1, including the following steps: S1. Place the Gaussmeter in the center of the bottom of the lower box 101, adjust the distance between the first magnet 20 and the second magnet 30 to adjust the magnetic field strength to 0.3 Tesla, and then take out the Gaussmeter; place the experimental sample of FeNi@SiO2 nanochain\PI composite material in the lower box 101, press the experimental sample with the pressing block 100, so that the experimental sample fits the bottom of the lower box 101, but it is necessary to leave the position of the air inlet 103 and the exhaust port 104, and the sample a is in block shape, so there are more gaps between the samples a loaded into the lower box 101 to ensure the passage and discharge of inert gas, and then cover the cover 102; the air inlet 103 is connected to the inert gas inlet pipe, the exhaust port 104 is connected to the inert gas exhaust pipe, and the end of the exhaust pipe is immersed in water; introduce inert gas into the heating box and exhaust the air in the box 10, the inert gas is helium; S2. Continue to introduce inert gas until all the air in the box 10 is exhausted and the rate of bubbles appearing in the water is uniform and stable, then start heating the temperature in the heating box to 400°C at a heating rate of 10°C / min, and then keep the temperature at 400°C for 40 minutes; S3. After the insulation is completed, the heating box stops heating. After the experimental sample cools down to room temperature naturally, the inert gas is stopped from being introduced. The treated experimental sample is taken out and recorded as Sample I.

[0059] Example 2-1: The FeNi@SiO2 nanochain\PI composite material (sample a) was treated using the experimental apparatus in Example 1, including the following steps: S1. Place the Gaussmeter in the center of the bottom of the lower box 101, adjust the distance between the first magnet 20 and the second magnet 30 to adjust the magnetic field strength to 0.2 Tesla, and then take out the Gaussmeter; place the experimental sample of FeNi@SiO2 nanochain\PI composite material in the lower box 101, press the experimental sample with the pressing block 100, so that the experimental sample fits the bottom of the lower box 101, but it is necessary to leave the position of the air inlet 103 and the exhaust port 104, and the sample a is in block shape, so there are more gaps between the samples a loaded into the lower box 101 to ensure the passage and discharge of inert gas, and then cover the cover 102; the air inlet 103 is connected to the inert gas inlet pipe, the exhaust port 104 is connected to the inert gas exhaust pipe, and the end of the exhaust pipe is immersed in water; inert gas is introduced into the heating box and the air in the box 10 is exhausted. The inert gas is argon; S2. Continue to introduce inert gas until all the air in the box 10 is exhausted and the rate of bubbles appearing in the water is uniform and stable, then start heating the box to 450°C at a heating rate of 8°C / min, and then keep the temperature at 450°C for 40 minutes; S3. After the insulation is completed, the heating box stops heating. After the experimental sample cools naturally to room temperature, the inert gas is stopped from being introduced. The treated experimental sample is taken out and recorded as Sample II.

[0060] Example 3-1: The FeNi@SiO2 nanochain\PI composite material (sample a) was treated using the experimental apparatus in Example 1, including the following steps: S1. Place the Gaussmeter in the center of the bottom of the lower box 101, adjust the distance between the first magnet 20 and the second magnet 30 to adjust the magnetic field strength to 0.4 Tesla, and then take out the Gaussmeter; place the experimental sample of FeNi@SiO2 nanochain\PI composite material in the lower box 101, press the experimental sample with the pressing block 100, so that the experimental sample fits the bottom of the lower box 101, but it is necessary to leave the position of the air inlet 103 and the exhaust port 104, and the sample a is in block shape, so there are more gaps between the samples a loaded into the lower box 101 to ensure the passage and discharge of inert gas, and then cover the cover 102; the air inlet 103 is connected to the inert gas inlet pipe, the exhaust port 104 is connected to the inert gas exhaust pipe, and the end of the exhaust pipe is immersed in water; introduce inert gas into the heating box, the inert gas is helium, and the air in the box 10 is discharged; S2. Continue to introduce inert gas until all the air in the box 10 is exhausted and the rate of bubbles appearing in the water is uniform and stable, then start heating the temperature in the heating box to 550°C at a heating rate of 15°C / min, and then keep the temperature at 550°C for 50 minutes; S3. After the insulation is completed, the heating box stops heating. After the experimental sample cools naturally to room temperature, the inert gas is stopped from being introduced, and the treated experimental sample is taken out and recorded as sample III.

[0061] Example 4-1: The FeNi@SiO2 nanochain\PI composite material (sample a) was treated using the experimental apparatus in Example 1, including the following steps: S1. Place the Gaussmeter in the center of the bottom of the lower box 101, adjust the distance between the first magnet 20 and the second magnet 30 to adjust the magnetic field strength to 0.1 Tesla, and then take out the Gaussmeter; place the experimental sample of FeNi@SiO2 nanochain\PI composite material in the lower box 101, press the experimental sample with the pressing block 100, so that the experimental sample fits the bottom of the lower box 101, but it is necessary to leave the position of the air inlet 103 and the exhaust port 104, and the sample a is in block shape, so there are more gaps between the samples a loaded into the lower box 101 to ensure the passage and discharge of inert gas, and then cover the cover 102; the air inlet 103 is connected to the inert gas inlet pipe, the exhaust port 104 is connected to the inert gas exhaust pipe, and the end of the exhaust pipe is immersed in water; introduce inert gas into the heating box, the inert gas is argon, and the air in the box 10 is discharged; S2. Continue to introduce inert gas until all the air in the box 10 is exhausted and the rate of bubbles appearing in the water is uniform and stable, then start heating the temperature in the heating box to 400°C at a heating rate of 5°C / min, and then keep the temperature at 400°C for 60 minutes; S3. After the insulation is completed, the heating box stops heating. After the experimental sample cools down to room temperature naturally, the inert gas is stopped from being introduced. The treated experimental sample is taken out and recorded as sample IV.

[0062] IV. Experimental Examples 1. The static magnetic properties and wave absorbing properties of sample a and samples I, II, III, and IV obtained in Examples 1-1 to 4-1 were tested.

[0063] (1) Use a vector network analyzer to obtain the electromagnetic parameters of the sample (complex dielectric constant and complex magnetic permeability in the X-band); use the obtained electromagnetic parameters to calculate the sample's absorption bandwidth and minimum reflection loss based on the metal backplane model and transmission line theory, as shown in Table 1. Figure 12 and Figure 14 As shown: Figure 12 The comparison diagram of complex magnetic permeability of sample a (FN) and sample I (FN-MA) in the X-band; Figure 14 The following is a comparison chart of the absorption performance (absorption bandwidth and minimum reflection loss) of sample a (FN) and sample I (FN-MA) obtained by calculation based on electromagnetic parameters (complex dielectric constant and complex magnetic permeability in the X-band); (2) The magnetization curve of the sample was detected by a vibrating sample magnetometer to obtain the saturation magnetization and coercive force of the sample, as shown in Table 1 and Figure 13 shown. Figure 13 VSM curves of sample a (FN) and sample I (FN-MA).

[0064] Table 1 Test results of experimental samples, examples and comparative examples As can be seen from Table 1, after sample a is treated with the experimental device in this application, the saturation magnetization intensity, absorption bandwidth, and minimum reflection loss are significantly improved, proving that after treatment with the experimental device in this application, the magnetization ability and absorption performance of sample a are enhanced, the frequency application range of the material is expanded, the adaptability is improved, the absorption efficiency of electromagnetic waves is improved, and the reflection is reduced; therefore, it can be seen that after sample a is treated with the experimental device in this application, the absorption performance is significantly improved, and it can efficiently absorb electromagnetic waves in a wider frequency range.

[0065] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0066] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0067] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. An experimental device for improving the magnetic properties of magnetic nanochain composite materials, characterized in that: It comprises a heating box for heating the magnetic nanochain composite material (110) and a magnet assembly for magnetizing the magnetic nanochain composite material (110); wherein, The heating box is provided with an air inlet (103) and an air outlet (104); The magnet assembly comprises a first magnet (20) and a second magnet (30), wherein the first magnet (20) and the second magnet (30) are arranged on opposite sides of the heating box, and the magnetic poles of the first magnet (20) and the second magnet (30) on opposite sides are opposite.

2. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 1, characterized in that: The experimental device further comprises a protective outer frame (70) arranged outside the heating box, and the first magnet (20) and the second magnet (30) are both arranged inside the protective outer frame (70).

3. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 2, characterized in that: The first magnet (20) and the second magnet (30) are both permanent magnets or electromagnets.

4. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 3, characterized in that: When the first magnet (20) and the second magnet (30) are both permanent magnets, the first magnet (20) and the second magnet (30) are both planar magnets; And / or, when the first magnet (20) and the second magnet (30) are both permanent magnets, the first magnet (20) and / or the second magnet (30) are connected to the protective outer frame (70) via a spacing adjustment component.

5. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 4, characterized in that: The spacing adjustment assembly includes a first mounting frame (40) and a first spacing adjustment bolt (80), the first magnet (20) is mounted on the first mounting frame (40), and the first mounting frame (40) is connected to the inner side of the protective outer frame (70) through the first spacing adjustment bolt (80); a first internal threaded hole is provided on the protective outer frame (70), and the first internal threaded hole is an internal threaded hole; the first spacing adjustment bolt (80) includes a head and a screw, and an end of the screw away from the head has an external thread adapted to the internal thread in the first internal threaded hole, the head of the first spacing adjustment bolt (80) is located on the outer side of the protective outer frame (70), and the screw of the first spacing adjustment bolt (80) passes through the first internal threaded hole on the first mounting frame (40) and is threadedly connected to the first internal threaded hole; And / or, the spacing adjustment component further includes a second mounting frame (50) and a second spacing adjustment bolt (90), the second magnet (30) is mounted on the second mounting frame (50), and the second mounting frame (50) is connected to the inner side of the protective outer frame (70) through the second spacing adjustment bolt (90); a second internal threaded hole is provided on the protective outer frame (70), and the second internal threaded hole is an internal threaded hole; the second spacing adjustment bolt (90) includes a head and a screw, and an end of the screw away from the head has an external thread adapted to the internal thread in the second internal threaded hole, the head of the second spacing adjustment bolt (90) is located on the outer side of the protective outer frame (70), and the screw of the second spacing adjustment bolt (90) passes through the second internal threaded hole on the second mounting frame (50) and is threadedly connected to the second internal threaded hole.

6. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 5, characterized in that: When the spacing adjustment component includes a first installation frame (40), first slide bars (120) are provided on both sides of the first installation frame (40), and the inner wall of the protective outer frame (70) is provided with a first slide groove that is slidably matched with the first slide bar (120) at a position corresponding to the first slide bar (120); And / or, when the spacing adjustment component includes a second mounting frame (50), second slide bars (130) are provided on both sides of the second mounting frame (50); and the inner wall of the protective outer frame (70) is provided with a second slide groove that slidably cooperates with the second slide bar (130) at a position corresponding to the second slide bar (130).

7. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 6, characterized in that: The heating box comprises a box body (10) and a heating component (60) for heating the box body (10); wherein, The box body (10) comprises a lower box body (101) with an open upper end and a cover body (102) adapted to the open end of the lower box body (101); the cover body (102) is detachably connected to the lower box body (101), and the cover body (102) and the lower box body (101) are sealed; The heating component (60) is arranged on the lower side of the lower box (101).

8. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 7, characterized in that: The heating box further comprises a pressing block (100) for applying pressure to the magnetic nanochain composite material (110) in the lower box body (101) to make it adhere closely to the bottom surface of the lower box body (101), and the pressing block (100) is adapted to the open end of the box body (10).

9. The experimental device for improving the magnetic properties of magnetic nanochain composite materials according to claim 8, characterized in that: The material of the box (10) includes any one of copper, silver and gold; And / or, the material of the pressing block (100) includes any one of copper, silver and gold; And / or, the material of the protective outer frame (70) includes austenitic stainless steel.

10. An experimental method for improving the magnetic properties of magnetic nanochain composite materials, characterized in that: The experimental device according to any one of claims 1 to 9 is used, comprising the following steps: S1. First, the magnetic field strength generated by the magnet assembly is adjusted to 0.1 to 0.5 Tesla, and then the experimental sample of the magnetic nanochain composite material (110) is placed in a heating box; then, an inert gas is introduced into the heating box; S2. Under the protection of inert gas, in a magnetic field strength of 0.1 to 0.5 Tesla, raise the temperature in the heating box to 400°C to 600°C at a heating rate of 5°C / min to 20°C / min, and then keep the temperature at 400°C to 600°C for 30 min to 60 min; S3. After the insulation is completed, the heating box stops heating, and the inert gas is stopped after the experimental sample cools down to room temperature naturally.

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