Novel magnet vane and preparation method thereof

Abstract

The invention belongs to the technical field of magnetism isolating plates, and particularly relates to a novel magnetism isolating plate which comprises a composite plate, the composite plate is composed of an outermost wear-resistant and corrosion-resistant protective layer, a middle high-permeability magnetism isolating material layer and an inner buffer layer in good contact with protected equipment, and the outermost wear-resistant and corrosion-resistant protective layer can be made of PTFE (polytetrafluoroethylene). The surface of the magnet vane is covered with the coating in a spraying or dipping mode, a uniform protective layer is formed, and the thickness of the uniform protective layer is usually 20 microns 300; and the middle layer of high-permeability magnetic isolation material layer is permalloy composed of 45 N i-Fe alloy containing 45% of nickel and 80 N i-Fe alloy containing 80% of nickel. According to the invention, the outermost layer is wear-resistant and corrosion-resistant, such as a PTFE or aluminum oxide ceramic layer, so that the interior is protected; the middle high-permeability magnetic isolation material layer effectively isolates a magnetic field; the inner buffer layer provides buffer, the buffer holes disperse stress and absorb energy and buffer, and the interval grooves enhance the fitting degree, so that stable operation of equipment in various complex environments is ensured jointly, and the service life of the magnet vane and the service life of the equipment are prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic isolation plates, in particular to a novel magnetic isolation plate and a preparation method thereof. Background Art

[0002] With the continuous development of modern science and technology, the requirements for magnetic field isolation in electronic equipment, motors, transformers and other fields are getting higher and higher. Traditional magnetic isolation materials and structures often have some limitations and cannot meet the increasingly complex and diverse application requirements.

[0003] On the one hand, in many high-precision electronic instruments, the interference of external magnetic fields may cause the performance of precision components inside the instrument to degrade, affecting the measurement accuracy and stability. Therefore, a material with high-efficiency magnetic isolation performance is needed to protect these devices.

[0004] On the other hand, with the trend of miniaturization and integration of equipment, higher requirements are placed on the weight, size and reliability of magnetic isolation materials. Traditional magnetic isolation materials may be too bulky, or prone to wear and corrosion during long-term use, reducing their magnetic isolation effect and service life.

[0005] In addition, different application scenarios have different requirements for the performance of magnetic isolation plates. For example, in some harsh working environments, magnetic isolation plates need to have good wear and corrosion resistance; and in the parts that come into contact with the protected equipment, they need to have good buffering properties to adapt to the shape changes of the equipment and reduce vibration and impact.

[0006] In order to solve these problems, it is crucial to develop a new type of magnetic isolation board. This new type of magnetic isolation board adopts a multi-layer composite structure, which consists of an outermost wear-resistant and corrosion-resistant protective layer, an intermediate high-permeability magnetic isolation material layer, and an inner buffer layer that is in good contact with the protected equipment. By selecting appropriate materials and optimizing the preparation process, the performance and service life of the magnetic isolation board can be comprehensively improved to meet the needs of different application scenarios. Summary of the invention

[0007] 1. Technical issues to be solved

[0008] In view of the deficiencies in the prior art, the present invention provides a novel magnetic isolation plate and a preparation method thereof, which solves the problems raised in the above-mentioned background technology.

[0009] (II) Technical solution

[0010] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0011] A novel magnetic isolation plate comprises a composite plate, wherein the composite plate is composed of an outermost wear-resistant and corrosion-resistant protective layer, an intermediate high magnetic permeability magnetic isolation material layer and an inner buffer layer in good contact with the protected equipment. The outermost wear-resistant and corrosion-resistant protective layer may be PTFE, which is covered on the surface of the magnetic isolation plate by spraying or dipping to form a uniform protective layer, and its thickness is usually between 20um300; the intermediate high magnetic permeability magnetic isolation material layer is a Permalloy composed of a 45N i-Fe alloy containing 45% nickel content and an 80N i-Fe alloy containing 80% nickel content, which is made into a thin sheet by cold rolling or hot rolling process, and the thickness is between several millimeters and tens of millimeters; the inner buffer layer in good contact with the protected equipment is composed of an elastic material or a foam material.

[0012] Furthermore, the outermost wear-resistant and corrosion-resistant protective layer is alumina ceramic, which has high hardness, good wear resistance and corrosion resistance. The alumina ceramic is made into thin sheets through a sintering process, and then pasted or welded on the surface of the middle layer of high magnetic permeability magnetic isolation material layer. Its thickness can be adjusted between 20 and 300um as needed.

[0013] Furthermore, the intermediate high permeability magnetic isolation material layer is an iron-based nanocrystalline alloy: it has the characteristics of high permeability and low loss. It is a nanocrystalline material prepared by rapid cooling and heat treatment process. The iron-based nanocrystalline alloy can be made into thin strips with a thickness of generally tens of microns.

[0014] Furthermore, the elastic material is rubber or silicone:

[0015] Rubber, such as natural rubber and nitrile rubber, has good elasticity and cushioning properties, can adapt to the shape changes of the protected equipment and ensure good contact. Rubber can be attached to the inner layer of the magnetic isolation plate by molding, pasting, etc., and the thickness is generally between a few millimeters and tens of millimeters;

[0016] Silicone: It has the characteristics of high temperature resistance, low temperature resistance and good softness. Silicone can be made into thin sheets or mats, and the thickness is usually within a few millimeters.

[0017] Furthermore, the foam material:

[0018] Polyurethane foam: It has good elasticity and cushioning properties, low density, and can reduce the overall weight. Polyurethane foam can be applied to the inner layer of the magnetic isolation board by cutting and pasting. The thickness is generally between a few millimeters and tens of millimeters.

[0019] Polystyrene foam: It has good thermal insulation and cushioning properties and low cost. Polystyrene foam can be made into suitable shapes and its thickness is generally between a few millimeters and tens of millimeters.

[0020] Furthermore, the buffer layer in good contact with the protected device is provided with buffer holes of different sizes and regularly distributed, and the bottom of the buffer layer in good contact with the protected device is also provided with spacing grooves arranged at equal intervals.

[0021] A novel method for preparing a magnetic isolation plate, the

[0022] S1. Prepare materials:

[0023] For the outermost wear-resistant and corrosion-resistant protective layer:

[0024] If you choose PTFE, prepare polytetrafluoroethylene material;

[0025] If alumina ceramics are selected, prepare alumina powder and other necessary additives;

[0026] For the middle layer of high magnetic permeability magnetic isolation material:

[0027] If Permalloy is selected, prepare the corresponding proportion of iron and nickel raw materials;

[0028] If you choose an iron-based nanocrystalline alloy, prepare iron, base elements and other alloying elements;

[0029] For the buffer layer with good contact between the inner layer and the protected equipment:

[0030] If you choose elastic material, prepare natural rubber, nitrile rubber or silicone material;

[0031] If you choose foam material, prepare the raw materials of polyurethane foam or polystyrene foam;

[0032] S2, preparing the outermost wear-resistant and corrosion-resistant protective layer;

[0033] PTFE protective layer:

[0034] During the spraying process, PTFE is heated to a molten state and sprayed evenly on the surface of the intermediate layer material with a spray gun, with the thickness controlled between 20 and 300 μm;

[0035] When using the dipping process, the intermediate layer material is immersed in a PTFE solution or suspension, and then taken out and dried;

[0036] Alumina ceramic protective layer:

[0037] The alumina powder and additives are mixed evenly and then placed in a high-temperature furnace for smelting, the temperature is usually above 1360°C;

[0038] The smelted melt is poured into a mold and cooled to form a thin sheet;

[0039] The thin sheet is processed, such as cutting and grinding, and then fixed to the surface of the middle layer material by gluing or welding;

[0040] S3, preparing the intermediate layer of high magnetic permeability magnetic isolation material layer:

[0041] Permalloy:

[0042] Prepare iron and nickel raw materials in proportion, put them into the furnace for smelting, and the smelting temperature is between 760℃-940℃:;

[0043] The molten alloy is poured into a casting mold and cooled to form an ingot;

[0044] The ingot is hot-rolled or cold-rolled to a thickness ranging from a few millimeters to tens of millimeters;

[0045] Iron-based nanocrystalline alloys:

[0046] Accurately weigh iron, base elements and other alloying elements;

[0047] The molten alloy liquid is rapidly cooled by a technique such as a belt-spinning method or a water quenching method to form an amorphous or nanocrystalline thin ribbon;

[0048] Heat treat the thin strip and control the parameters of heating temperature, holding time and cooling rate;

[0049] S4. Prepare a buffer layer that ensures good contact between the inner layer and the protected equipment:

[0050] Elastic Material:

[0051] Rubber buffer layer: Mix natural rubber or nitrile rubber with additives evenly, put it into a mold and mold it at a certain temperature and pressure. The thickness is controlled between a few millimeters and tens of millimeters.

[0052] Silicone cushioning layer: The silicone material is heated to a molten state, injected into a mold by extrusion or injection molding, and cooled to form a thin sheet or mat, usually within a few millimeters in thickness;

[0053] Foam Material:

[0054] Polyurethane foam: Mix polyurethane raw materials, polyols, isocyanates with foaming agents and catalyst additives, and perform foaming reaction under a certain temperature and pressure, and then cut and paste them into the required shape and thickness, ranging from a few millimeters to tens of millimeters;

[0055] Polystyrene foam: After the polystyrene particles are heated and softened, they are foamed in a mold and then cut into suitable shapes and thicknesses ranging from a few millimeters to tens of millimeters;

[0056] S5. Overall assembly:

[0057] If necessary, coating the contact surface of the middle layer and other layer materials with nanomaterials for bonding;

[0058] The outermost layer, the middle layer and the inner layer are laminated or bonded in sequence according to the design requirements. Glue or adhesive can be used to ensure that each layer is firmly bonded;

[0059] Post-process the assembled magnetic isolation panels, such as trimming edges, grinding surfaces, and performing performance tests and inspections;

[0060] Applicable to the novel magnetic isolation plate as described in claims 1-5.

[0061] (III) Beneficial effects

[0062] Compared with the prior art, the present invention provides a new type of magnetic isolation plate and a preparation method thereof, which has the following features:

[0063] Beneficial effects:

[0064] The present invention has significant performance improvement. The outermost layer is wear-resistant and corrosion-resistant, such as PTFE or alumina ceramic layer, to protect the interior; the middle layer of high magnetic permeability magnetic isolation material layer effectively isolates the magnetic field; the inner buffer layer provides buffering, the buffer holes disperse stress and absorb energy, and the spacing grooves enhance the fit, which together ensure the stable operation of the equipment in a variety of complex environments and extend the service life of the magnetic isolation plate and the equipment.

[0065] The present invention ensures measurement accuracy in high-precision electronic instruments; meets weight, size and reliability requirements in miniaturized equipment; works normally in harsh environments by virtue of its wear-resistant and corrosion-resistant properties; reduces impacts in mobile or vibrating equipment by means of a buffer layer and a special structure. At the same time, its design adapts to changes in the shapes of various equipment, provides efficient magnetic isolation and protection for equipment in different fields, and has wide adaptability and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0067] Figure 2 This is a schematic diagram of the internal structure of the buffer layer of the present invention, in which the inner layer is in good contact with the protected device;

[0068] Figure 3 It is an experimental data analysis diagram of an embodiment of the present invention.

[0069] In the figure: 1. The outermost wear-resistant and corrosion-resistant protective layer; 2. The middle layer of high magnetic permeability magnetic isolation material layer; 3. The inner layer of buffer layer that is in good contact with the protected equipment; 4. Buffer holes; 5. Spacing grooves. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] Example 1: Preparation of magnetic isolation plate with PTFE outer layer, Permalloy middle layer and rubber inner layer

[0072] S1. Prepare materials:

[0073] For the outermost wear-resistant and corrosion-resistant protective layer 1, PTFE is selected and polytetrafluoroethylene material is prepared.

[0074] For the intermediate high magnetic permeability magnetic isolation material layer 2, Permalloy is selected, and raw materials of 45Ni i-Fe alloy containing 45% nickel content and 80Ni i-Fe alloy containing 80% nickel content are prepared.

[0075] For the buffer layer 3 whose inner layer is in good contact with the protected equipment, rubber is selected, and natural rubber or nitrile rubber material is prepared.

[0076] S2. Preparation of the outermost PTFE protective layer:

[0077] Through the spraying process, PTFE is heated to a molten state and sprayed evenly on the surface of the intermediate layer material with a spray gun, and the thickness is controlled between 20 and 300 μm, for example, the thickness is set to 150 μm.

[0078] S3, preparing the middle layer Permalloy layer:

[0079] Prepare iron and nickel raw materials in proportion, put them into the furnace for smelting, and the smelting temperature is between 760℃-940℃, for example, the smelting temperature is set to 850℃.

[0080] The molten alloy is poured into a casting mold and cooled to form an ingot.

[0081] The ingots were hot rolled to a thickness of 10 mm.

[0082] S4. Preparation of inner rubber buffer layer:

[0083] The natural rubber or nitrile rubber is mixed evenly with the additives, put into a mold and molded at 150°C and 20MPa, and the thickness is controlled at 10 mm.

[0084] S5. Overall assembly:

[0085] Nano-silicon dioxide material is coated on the contact surface of the middle layer and other layer materials for bonding.

[0086] The outermost layer, middle layer and inner layer are laminated and bonded in sequence according to the design requirements, and epoxy resin adhesive is used to ensure that each layer is firmly bonded.

[0087] Example 1: Preparation of magnetic isolation plate with PTFE outer layer, Permalloy middle layer and rubber inner layer

[0088] S1. Prepare materials:

[0089] For the outermost wear-resistant and corrosion-resistant protective layer 1, PTFE is selected and polytetrafluoroethylene material is prepared.

[0090] For the intermediate high magnetic permeability magnetic isolation material layer 2, Permalloy is selected, and raw materials of 45Ni i-Fe alloy containing 45% nickel content and 80Ni-Fe alloy containing 80% nickel content are prepared.

[0091] For the buffer layer 3 whose inner layer is in good contact with the protected equipment, rubber is selected, and natural rubber or nitrile rubber material is prepared.

[0092] S2. Preparation of the outermost PTFE protective layer:

[0093] Through the spraying process, PTFE is heated to a molten state and sprayed evenly on the surface of the intermediate layer material with a spray gun, and the thickness is controlled between 20 and 300 μm, for example, the thickness is set to 150 μm.

[0094] S3, preparing the middle layer Permalloy layer:

[0095] Prepare iron and nickel raw materials in proportion, put them into the furnace for smelting, and the smelting temperature is between 760℃-940℃, for example, the smelting temperature is set to 850℃.

[0096] The molten alloy is poured into a casting mold and cooled to form an ingot.

[0097] The ingots were hot rolled to a thickness of 10 mm.

[0098] S4. Preparation of inner rubber buffer layer:

[0099] The natural rubber or nitrile rubber is mixed with the additives evenly, and then put into a mold for compression molding at 150°C and 20MPa, with the thickness controlled at 10mm;

[0100] When preparing a buffer layer 3 whose inner layer is in good contact with the protected device, for buffer layer materials such as rubber or foam materials, a mold forming process can be used to form buffer holes 4. For example, a corresponding convex structure is pre-set in the mold for making the rubber buffer layer, and when the rubber material is molded in the mold, these convex structures will form buffer holes 4 of different sizes and regular distribution in the rubber layer. For materials such as polyurethane foam or polystyrene foam, during the foaming process, a placeholder of a specific shape and size can be inserted into the mold, and the placeholder can be removed after the foaming is completed, thereby forming the buffer holes 4;

[0101] For the rubber inner layer, if it is necessary to enhance the buffering performance and adapt to certain equipment deformation, larger buffer holes 4 (such as 5-10mm in diameter) can be distributed in the central area of ​​the rubber layer to cope with larger impact forces; smaller buffer holes 4 (such as 1-3mm in diameter) can be distributed in the edge area to disperse smaller stresses and improve overall flexibility.

[0102] S5. Overall assembly:

[0103] Nano-silicon dioxide material is coated on the contact surface of the middle layer and other layer materials for bonding.

[0104] The outermost layer, middle layer and inner layer are laminated and bonded in sequence according to the design requirements, and epoxy resin adhesive is used to ensure that each layer is firmly bonded.

[0105] The assembled magnetic isolation board is post-processed, the edges are trimmed to meet the required size, the surface is polished to make it smooth and flat, and then the performance test and inspection are carried out. The performance test results show that the magnetic isolation efficiency of the magnetic isolation board reaches more than 90%, and the wear resistance is good. In the simulated wear test, the surface wear is extremely small, and the buffering performance can also effectively reduce the vibration impact on the equipment.

[0106] Example 2: Preparation of magnetic isolation plate with alumina ceramic outer layer, iron-based nanocrystalline alloy middle layer and silica gel inner layer

[0107] S1. Prepare materials:

[0108] The outermost layer is made of alumina ceramics, and alumina powder and other necessary additives are prepared.

[0109] The middle layer selects an iron-based nanocrystalline alloy, and prepares iron, base elements and other alloy elements.

[0110] Choose silicone for the inner layer and prepare the silicone material.

[0111] S2. Preparation of the outermost alumina ceramic protective layer

[0112] The alumina powder and additives are mixed evenly and then placed into a high temperature furnace for smelting at a temperature above 1360°C, such as 1400°C.

[0113] The smelted melt is poured into a mold and cooled to form a thin sheet, which is then fixed to the surface of the middle layer material by pasting, with the thickness set to 200 μm.

[0114] S3. Preparation of an intermediate iron-based nanocrystalline alloy layer

[0115] Accurately weigh iron, base elements and other alloying elements.

[0116] The molten alloy liquid is formed into a nanocrystalline thin ribbon by a spinning method, and the thickness of the thin ribbon is 50 microns.

[0117] The thin strip was heat treated at a heating temperature of 500°C, a holding time of 2 hours, and a cooling rate controlled at 100°C / hour.

[0118] S4. Preparation of inner silica gel buffer layer

[0119] The silicone material is heated to a molten state, injected into a mold by extrusion, and cooled to form a thin sheet with a thickness of 3 mm;

[0120] The spacing grooves 5 can be manufactured by mechanical processing after the buffer layer is formed. For example, a cutting tool or laser cutting equipment is used to cut a groove of a certain depth and width at the bottom of the buffer layer according to the requirements of equal spacing. For a buffer layer made of elastic materials such as rubber or silicone, the cutting depth is generally controlled to be about 1 / 3-1 / 2 of the thickness of the buffer layer to ensure that an effective spacing groove 5 is formed without affecting the overall strength of the buffer layer. For softer materials such as polyurethane foam or polystyrene foam, the cutting depth can be relatively shallow, such as 1 / 4-1 / 3 of the thickness of the buffer layer, to avoid excessive damage to the foam structure during the cutting process. The width of the spacing groove 5 can be designed according to actual needs, generally between 1-3mm.

[0121] S5. Overall assembly

[0122] Nano-aluminum oxide material is coated on the contact surface of the middle layer and other layer materials for bonding.

[0123] The outermost layer, middle layer and inner layer are laminated and bonded in sequence according to the design requirements, and organic silicone adhesive is used to ensure that each layer is firmly bonded.

[0124] The assembled magnetic isolation board was post-processed, the edges were trimmed and the surface was polished, and then the performance test was carried out. The test results showed that the magnetic isolation board had a significant magnetic isolation effect under high-frequency magnetic field, the magnetic isolation coefficient reached above 0.95, and the corrosion resistance was excellent. There was no obvious corrosion phenomenon in the acid and alkali solution immersion test. The softness of the inner layer of silicone ensured good contact with the protected equipment and good buffering performance.

[0125] Example 3: Preparation of magnetic isolation board with PTFE outer layer, Permalloy middle layer and polyurethane foam inner layer

[0126] S1. Prepare materials:

[0127] The outermost layer is prepared with PTFE material.

[0128] The middle layer is made of Permalloy raw material.

[0129] The inner layer prepares the raw materials of polyurethane foam, including polyol, isocyanate, blowing agent, catalyst additive, etc.

[0130] S2. Preparation of the outermost PTFE protective layer

[0131] Through the dipping process, the intermediate layer material is immersed in the PTFE solution, taken out and dried, and the thickness of the protective layer is controlled to be 100 μm.

[0132] S3. Preparation of middle layer Permalloy layer

[0133] Prepare iron and nickel raw materials in proportion, and set the smelting temperature to 900℃.

[0134] After processes such as molding and cold rolling, the thickness of the middle layer reaches 15 mm.

[0135] S4. Preparation of inner polyurethane foam buffer layer

[0136] The polyurethane raw materials were mixed and foamed at 30°C and 10 MPa.

[0137] After foaming, cut and paste into the required shape and thickness, such as 20 mm thickness;

[0138] When preparing a buffer layer 3 whose inner layer is in good contact with the protected device, for buffer layer materials such as rubber or foam materials, a mold forming process can be used to form buffer holes 4. For example, a corresponding convex structure is pre-set in the mold for making the rubber buffer layer, and when the rubber material is molded in the mold, these convex structures will form buffer holes 4 of different sizes and regular distribution in the rubber layer. For materials such as polyurethane foam or polystyrene foam, during the foaming process, a placeholder of a specific shape and size can be inserted into the mold, and the placeholder can be removed after the foaming is completed, thereby forming the buffer holes 4;

[0139] The spacing grooves 5 can be manufactured by mechanical processing after the buffer layer is formed. For example, use a cutting tool or laser cutting equipment to cut grooves of a certain depth and width at the bottom of the buffer layer according to the requirements of equal spacing. For buffer layers made of elastic materials such as rubber or silicone, the cutting depth is generally controlled to be around 1 / 3-1 / 2 of the thickness of the buffer layer to ensure that effective spacing grooves 5 are formed without affecting the overall strength of the buffer layer. For softer materials such as polyurethane foam or polystyrene foam, the cutting depth can be relatively shallow, such as 1 / 4-1 / 3 of the thickness of the buffer layer, to avoid excessive damage to the foam structure during the cutting process. The width of the spacing groove 5 can be designed according to actual needs, generally between 1-3mm;

[0140] For the polyurethane foam inner layer, since it is mainly used to reduce weight and provide a certain amount of cushioning, the size of the cushioning holes 4 can be relatively small and distributed more evenly, such as cushioning holes 4 with a diameter of 2-5 mm are evenly distributed in the entire foam layer at a certain interval (such as 5-10 mm).

[0141] S5. Overall assembly

[0142] Nano-carbon materials are coated on the contact surfaces of the middle layer and other layer materials for bonding.

[0143] The outermost layer, the middle layer and the inner layer are laminated and bonded in sequence, and polyurethane adhesive is used to ensure that each layer is firmly bonded.

[0144] Post-processing includes trimming edges and polishing surfaces. Performance test results show that the magnetic isolation board is light in weight, about 20% lighter than traditional magnetic isolation boards. The magnetic isolation performance is stable, and the magnetic isolation effect fluctuates little under different magnetic field intensities. The polyurethane foam inner layer effectively reduces the overall weight, and at the same time has good cushioning performance and can adapt to a certain degree of equipment deformation.

[0145] Combination Figure 3 Among them, the effects and benefits of Example 1 (PTFE outer layer, Permalloy middle layer, rubber inner layer);

[0146] Magnetic isolation performance: The magnetic isolation efficiency reaches 92%. The Permalloy intermediate layer has a high magnetic permeability, which can effectively guide the magnetic lines of force and reduce magnetic field leakage, providing a good magnetic field isolation environment for precision electronic equipment, ensuring the normal operation of the equipment and high-precision measurement.

[0147] Wear resistance: The wear amount after the simulated wear test is only 5mg. The PTFE outer layer has good wear resistance, can effectively resist external friction, extend the service life of the magnetic isolation plate in a certain friction environment, and protect the internal structure.

[0148] Corrosion resistance: It can maintain good performance after being immersed in acid and alkali solution for 720 hours. The corrosion resistance of the PTFE outer layer makes it suitable for a variety of chemical environments, such as magnetic field isolation around chemical equipment.

[0149] Cushioning performance: The shock absorption rate is 85%. The elasticity of the rubber inner layer can adapt to the shape changes of the equipment and reduce the impact of vibration on the equipment and the magnetic isolation plate itself. For example, it can play a good cushioning role in mobile equipment or equipment with slight vibration.

[0150] Comprehensive advantages: The performance is relatively balanced and can work stably under a variety of normal working conditions. It is suitable for equipment with certain requirements for magnetic isolation performance and not too harsh environmental conditions, such as magnetic field protection of small motors and sensors in general industrial automation equipment.

[0151] Effects and benefits of Example 2 (alumina ceramic outer layer, iron-based nanocrystalline alloy middle layer, silicone inner layer);

[0152] Magnetic isolation performance: The magnetic isolation efficiency is as high as 95%. The high magnetic permeability and low loss characteristics of the iron-based nanocrystalline alloy middle layer make it have a significant magnetic isolation effect under high-frequency magnetic fields. It is suitable for high-frequency electronic equipment, such as magnetic isolation protection of some precision components in communication base stations.

[0153] Wear resistance: After the simulated wear test, the wear amount is only 2mg. The outer layer of alumina ceramic has high hardness and excellent wear resistance. It can maintain the integrity of the magnetic isolation plate for a long time in a high wear environment, such as the magnetic isolation application of equipment in some mechanical processing workshops.

[0154] Corrosion resistance: It can be immersed in acid and alkali solutions for 1000 hours. The strong corrosion resistance of alumina ceramics enables it to withstand more severe chemical corrosion environments. It can be used for magnetic isolation of equipment in harsh environments such as chemical industry and ocean.

[0155] Cushioning performance: The shock absorption rate is 90%. The inner layer of silicone is resistant to high and low temperatures and has good softness. It can better fit the equipment and maintain good cushioning performance in extreme temperature environments to ensure equipment safety, such as magnetic isolation of electronic components in aerospace equipment.

[0156] Comprehensive advantages: It performs well in magnetic isolation, wear resistance, corrosion resistance and buffering performance. It is especially suitable for high-end equipment with extremely high performance requirements and harsh working environment. It can provide long-term stable and reliable magnetic field isolation and equipment protection.

[0157] Embodiment 3 (PTFE outer layer, Permalloy middle layer, polyurethane foam inner layer) Effects and benefits;

[0158] Magnetic isolation performance: The magnetic isolation efficiency is 90%, which meets the general magnetic isolation needs. The Permalloy intermediate layer ensures the basic magnetic isolation effect and is suitable for equipment that does not have the most stringent magnetic isolation requirements.

[0159] Wear resistance: The wear amount after the simulated wear test is 8 mg. The PTFE outer layer provides a certain wear resistance and can cope with general friction and can work normally in daily use environment.

[0160] Corrosion resistance: After being immersed in acid and alkali solutions for 720 hours, the corrosion resistance of the PTFE outer layer enables it to be used in common chemical environments.

[0161] Cushioning performance: The shock absorption rate is 80%. The inner layer of polyurethane foam has a low density, which effectively reduces the overall weight. At the same time, it has a certain cushioning performance. It is suitable for scenes with strict weight requirements and small equipment vibration, such as portable electronic devices and magnetic isolation of electronic components in small drones.

[0162] Comprehensive advantages: Light weight, about 20% lighter than traditional magnetic isolation plates, has obvious advantages in applications that are sensitive to equipment weight. Under the premise of ensuring certain performance, it provides the possibility for lightweight design of equipment; can be widely used in machinery, road and ground transportation vehicles, marine ships, and low-altitude spacecraft.

[0163] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel magnetic isolation plate, comprising a composite plate, characterized in that: The composite plate is composed of an outermost wear-resistant and corrosion-resistant protective layer (1), an intermediate high magnetic permeability magnetic isolation material layer (2), and an inner buffer layer (3) in good contact with the protected equipment. The outermost wear-resistant and corrosion-resistant protective layer (1) can be PTFE, which is coated on the surface of the magnetic isolation plate by spraying or dipping to form a uniform protective layer, and its thickness is usually between 20 and 300 um; the intermediate high magnetic permeability magnetic isolation material layer (2) is a Permalloy composed of a 45Ni-Fe alloy containing 45% nickel and an 80Ni-Fe alloy containing 80% nickel, which is formed into a thin sheet by cold rolling or hot rolling process, and the thickness is between several millimeters and tens of millimeters; the inner buffer layer (3) in good contact with the protected equipment is composed of an elastic material or a foam material.

2. A novel magnetic isolation plate according to claim 1, characterized in that: The outermost wear-resistant and corrosion-resistant protective layer (1) is alumina ceramics, which has high hardness, good wear resistance and corrosion resistance. The alumina ceramics are made into thin sheets through a sintering process and then pasted or welded on the surface of the middle layer of high magnetic permeability magnetic isolation material layer (2). The thickness of the alumina ceramics can be adjusted between 20 and 300 um as needed.

3. A novel magnetic isolation plate according to claim 1, characterized in that: The intermediate high magnetic permeability magnetic isolation material layer (2) is an iron-based nanocrystalline alloy: it has the characteristics of high magnetic permeability and low loss. It is a nanocrystalline material prepared by rapid cooling and heat treatment process. The iron-based nanocrystalline alloy can be made into thin strips with a thickness of about tens of microns.

4. The novel magnetic isolation plate according to claim 1 is characterized in that: The elastic material is rubber or silicone: Rubber, such as natural rubber and nitrile rubber, has good elasticity and cushioning properties, can adapt to the shape changes of the protected equipment and ensure good contact. Rubber can be attached to the inner layer of the magnetic isolation plate by molding, pasting, etc., and the thickness is generally between a few millimeters and tens of millimeters; Silicone: It has the characteristics of high temperature resistance, low temperature resistance and good softness. Silicone can be made into thin sheets or mats, and the thickness is usually within a few millimeters.

5. The novel magnetic isolation plate according to claim 1 is characterized in that: The foam material: Polyurethane foam: It has good elasticity and cushioning properties, low density, and can reduce the overall weight. Polyurethane foam can be applied to the inner layer of the magnetic isolation board by cutting and pasting. The thickness is generally between a few millimeters and tens of millimeters. Polystyrene foam: It has good thermal insulation and cushioning properties and low cost. Polystyrene foam can be made into suitable shapes and its thickness is generally between a few millimeters and tens of millimeters.

6. The novel magnetic isolation plate according to claim 1 is characterized in that: The buffer layer (3) for good contact between the inner layer and the protected device is provided with buffer holes (4) of different sizes and distributed regularly, and the bottom of the buffer layer (3) for good contact between the inner layer and the protected device is also provided with spacing grooves (5) arranged at equal intervals.

7. A method for preparing a novel magnetic isolation plate, characterized in that: Said S1. Prepare materials: For the outermost wear-resistant and corrosion-resistant protective layer (1): If you choose PTFE, prepare polytetrafluoroethylene material; If you choose alumina ceramics, prepare alumina powder and other necessary additives; For the intermediate high permeability magnetic isolation material layer (2): If Permalloy is selected, prepare the corresponding proportion of iron and nickel raw materials; If you choose an iron-based nanocrystalline alloy, prepare iron, base elements and other alloying elements; For the buffer layer (3) whose inner layer is in good contact with the protected equipment: If you choose elastic material, prepare natural rubber, nitrile rubber or silicone material; If you choose foam material, prepare the raw materials of polyurethane foam or polystyrene foam; S2. Preparation of the outermost wear-resistant and corrosion-resistant protective layer (1): PTFE protective layer: During the spraying process, PTFE is heated to a molten state and sprayed evenly on the surface of the intermediate layer material with a spray gun, with the thickness controlled between 20 and 300 μm; When using the dipping process, the intermediate layer material is immersed in a PTFE solution or suspension, and then taken out and dried; Alumina ceramic protective layer: The alumina powder and additives are mixed evenly and then placed in a high-temperature furnace for smelting, the temperature is usually above 1360°C; The smelted melt is poured into a mold and cooled to form a thin sheet; The thin sheet is processed, such as cutting and grinding, and then fixed to the surface of the middle layer material by gluing or welding; S3, preparing an intermediate layer of high magnetic permeability magnetic isolation material layer (2): Permalloy: Prepare iron and nickel raw materials in proportion, put them into the furnace for smelting, and the smelting temperature is between 760℃-940℃:; The molten alloy is poured into a casting mold and cooled to form an ingot; The ingot is hot-rolled or cold-rolled to a thickness ranging from a few millimeters to tens of millimeters; Iron-based nanocrystalline alloys: Accurately weigh iron, base elements and other alloying elements; The molten alloy liquid is rapidly cooled by a technique such as a belt-spinning method or a water quenching method to form an amorphous or nanocrystalline thin ribbon; Heat treat the thin strip and control the parameters of heating temperature, holding time and cooling rate; S4. Prepare a buffer layer (3) with good contact between the inner layer and the protected device: Elastic Material: Rubber buffer layer: Mix natural rubber or nitrile rubber with additives evenly, put it into a mold and mold it at a certain temperature and pressure. The thickness is controlled between a few millimeters and tens of millimeters. Silicone cushioning layer: The silicone material is heated to a molten state, injected into a mold by extrusion or injection molding, and cooled to form a thin sheet or mat, usually within a few millimeters in thickness; Foam Material: Polyurethane foam: Mix polyurethane raw materials, polyols, isocyanates with foaming agents and catalyst additives, and perform foaming reaction under a certain temperature and pressure, and then cut and paste them into the required shape and thickness, ranging from a few millimeters to tens of millimeters; Polystyrene foam: After the polystyrene particles are heated and softened, they are foamed in a mold and then cut into suitable shapes and thicknesses ranging from a few millimeters to tens of millimeters; S5. Overall assembly: If necessary, coating the contact surface of the middle layer and other layer materials with nanomaterials for bonding; The outermost layer, the middle layer and the inner layer are laminated or bonded in sequence according to the design requirements. Glue or adhesive can be used to ensure that each layer is firmly bonded; Post-process the assembled magnetic isolation panels, such as trimming edges, grinding surfaces, and performing performance tests and inspections; Applicable to the novel magnetic isolation plate as described in claims 1-5.

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