CN114919265A - Light composite material for efficiently shielding low-frequency magnetic field - Google Patents
Light composite material for efficiently shielding low-frequency magnetic field Download PDFInfo
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- CN114919265A CN114919265A CN202210482802.5A CN202210482802A CN114919265A CN 114919265 A CN114919265 A CN 114919265A CN 202210482802 A CN202210482802 A CN 202210482802A CN 114919265 A CN114919265 A CN 114919265A
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/02—Layer formed of wires, e.g. mesh
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/092—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising epoxy resins
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
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- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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- B32B2262/103—Metal fibres
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
Abstract
The invention discloses a light composite material for efficiently shielding a low-frequency magnetic field, which comprises a carbon fiber reinforced resin layer, a permalloy sheet and a copper net; the number of layers of the permalloy sheets is more than or equal to 1, and the number of layers of the copper mesh is more than or equal to 2; the carbon fiber reinforced resin layer, the permalloy sheet and the copper mesh are arranged in parallel; at least one layer of permalloy sheet is positioned between two layers of copper nets, and carbon fiber reinforced resin layers are respectively arranged between the permalloy sheet positioned between the two layers of copper nets and the two layers of copper nets. The composite material solves the shielding problem of a low-frequency magnetic field less than or equal to 10MHz, has a good magnetic shielding effect in a full frequency band, has the advantages of light weight and corrosion resistance, and has wide application prospect in the technical field of magnetic shielding.
Description
Technical Field
The invention belongs to the technical field of magnetic shielding materials, and particularly relates to a light composite material for efficiently shielding a low-frequency magnetic field.
Background
Information, energy and materials are three major pillars in the current society, and are particularly prominent in the military field; the war informatization is the central importance of the game among the large countries, so that functional composite materials such as optical stealth materials, radar stealth materials, infrared stealth materials, shielding materials, wave-transmitting materials and the like are produced.
For a long time, the shielding materials at home and abroad are basically made of metal materials, have heavy weight and are easy to corrode; with the scientific progress of functional composite materials, the shielding composite materials of various countries emerge like bamboo shoots in spring after rain, but face the same problem facing the same field in the world, namely the effect on low-frequency magnetic fields less than or equal to 10MHz is not ideal.
Disclosure of Invention
The invention aims to overcome the defects and provide a light composite material for efficiently shielding a low-frequency magnetic field, which comprises a carbon fiber reinforced resin layer, a permalloy sheet and a copper mesh; the number of layers of the permalloy sheets is more than or equal to 1, and the number of layers of the copper mesh is more than or equal to 2; the carbon fiber reinforced resin layer, the permalloy sheet and the copper mesh are arranged in parallel; at least one layer of permalloy sheet is positioned between two layers of copper meshes, and carbon fiber reinforced resin layers are respectively arranged between the permalloy sheet positioned between the two layers of copper meshes and the two layers of copper meshes. The composite material solves the shielding problem of a low-frequency magnetic field less than or equal to 10MHz, has a good magnetic shielding effect in a full frequency band, has the advantages of light weight and corrosion resistance, and has wide application prospect in the technical field of magnetic shielding.
In order to achieve the above purpose, the invention provides the following technical scheme:
a light composite material for efficiently shielding a low-frequency magnetic field comprises a carbon fiber reinforced resin layer, a permalloy sheet and a copper mesh; the permalloy sheet is in an amorphous state; the amorphous permalloy sheet refers to an alloy sheet with an amorphous area of more than or equal to 60 percent, namely an alloy sheet with an area occupied by a long-range ordered part of less than or equal to 40 percent under a metallographic microscope;
the number of layers of the permalloy sheets is more than or equal to 1, and the number of layers of the copper mesh is more than or equal to 2;
the carbon fiber reinforced resin layer, the permalloy sheet and the copper mesh are arranged in parallel;
at least one layer of permalloy sheet is positioned between two layers of copper nets, and carbon fiber reinforced resin layers are respectively arranged between the permalloy sheet positioned between the two layers of copper nets and the two layers of copper nets.
Further, the relative magnetic permeability of the permalloy sheet is more than or equal to 80000;
the thickness of the permalloy sheet is more than or equal to 0.02 mm; the mass percentage of nickel in the permalloy sheet is 35-90%.
Further, the amorphous permalloy sheet is prepared at a cooling speed of not less than 5000 ℃/s.
Furthermore, the outermost layer of the light composite material for efficiently shielding the low-frequency magnetic field is a copper mesh or a carbon fiber reinforced resin layer;
carbon fiber reinforced resin layers are arranged between each layer of permalloy sheet and the adjacent permalloy sheet or copper net, and between each layer of copper net and the adjacent permalloy sheet or copper net.
Further, a glue film is attached to the surface of the permalloy sheet or glue brushing is carried out, the glue film is an epoxy glue film or a cyanate ester glue film, and the type of glue used for glue brushing is one or more of epoxy glue, cyanate ester glue, polyurethane, benzoxazine or phenolic resin.
Furthermore, the mesh number of the copper mesh is more than or equal to 60 meshes, and the diameter of copper wires in the copper mesh is less than or equal to 0.1 mm.
Furthermore, the carbon fiber reinforced resin layer is obtained by impregnating each layer of permalloy sheet and the adjacent permalloy sheet or copper mesh and each layer of copper mesh and the adjacent permalloy sheet or copper mesh with a carbon fiber reinforced resin prepreg and then curing the whole body.
Further, the carbon fiber reinforced resin layer comprises a resin matrix and carbon fibers; the mass percentage of the resin matrix in the carbon fiber reinforced resin layer is 20-80%; the resin matrix is one or the combination of more than one of epoxy resin, cyanate ester, polyurethane, benzoxazine and phenolic resin.
Furthermore, when the single-layer permalloy sheets are formed by overlapping a plurality of smaller-sized permalloy sheets, the smaller-sized permalloy sheets are bonded by resin bonding layers with the thickness of less than or equal to 0.1mm, and the overlapping width of the smaller-sized permalloy sheets is greater than or equal to 1.0 mm.
Furthermore, the number of layers of the permalloy sheet is 1, the number of layers of the copper net is 2, and the mesh number of the copper net is 60 meshes;
thickness d of permalloy sheet according to shielding effectiveness SE at 10kHz magnetic field 10 Determining:
d＝(SE 10 -31.15)/149；
or thickness d of permalloy sheet according to shielding effectiveness SE at 100kHz magnetic field 100 Determining:
d＝(SE 100 -58.0)/146.5；
the unit of the thickness d of the permalloy sheet is mm, and the unit of the shielding effect is dB.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the light composite material for efficiently shielding the low-frequency magnetic field is innovatively designed, the permalloy sheet is arranged between two layers of copper nets, so that the shielding efficiency of the low-frequency magnetic field of 10kHz can reach 34.1dB, the shielding efficiency of the low-frequency magnetic field of 100kHz can reach 60.9dB, the problem of magnetic shielding of the low-frequency magnetic field of less than or equal to 10MHz is solved, and the light composite material has a good magnetic shielding effect in a full frequency band;
(2) on the basis of good magnetic shielding effect, the invention reduces the weight of the material and improves the corrosion resistance of the material; the existing shielding material generally uses a carbon steel plate, and on one hand, the density of the carbon steel plate is 7.85g/cm 3 The density of the invention can reach 2.30g/cm 3 (ii) a On the other hand, carbon steel plates are easy to corrode, and particularly carbon elements and iron elements are led by different electrochemical potentialsThe functional layer made of metal materials is clamped between the carbon fiber resin matrix composite materials, so that the corrosion condition does not exist;
(3) in the invention, the resin, the copper mesh and the amorphous permalloy are co-cured together in the curing process, so that the purpose of bonding is achieved, and the strength of the material is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a light composite material for efficiently shielding a low-frequency magnetic field according to the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
At present, most of the existing light magnetic shielding composite materials of the same type attenuate and reflect a magnetic field through attenuating and reflecting an electric field, for example, carbon black, copper mesh, aluminum mesh, carbon fiber and other conductive non-magnetic materials are added, the materials have small attenuation and reflection effects on the magnetic field, and the shielding effectiveness under a 10kHz magnetic field is generally lower than 17.5 dB; on the basis of considering attenuation and reflection electric fields, magnetic materials such as iron-based, nickel-based and cobalt-based powders, metal wires, metal nets, metal sheets and metal blocks are added into another type of magnetic shielding material, the continuous problem of electromagnetic wave magnetic induction lines is not considered, the synergistic relationship among mutual oscillation, attenuation and reflection of the electric field and the magnetic field is not considered, and the shielding effectiveness of the material under the 10kHz magnetic field is generally between 15 and 25 dB.
On one hand, the carbon fiber in a weaving state and the copper net with high conductivity are used for attenuating and reflecting an electric field; on the other hand, non-pore (no gap at the lap joint part) amorphous permalloy sheets with high magnetic conductivity (the relative magnetic conductivity is more than or equal to 80000) are added between the 2 layers of high-conductivity copper nets, so that magnetic induction lines of electromagnetic waves are deflected and lost in the amorphous permalloy layers, and simultaneously, under the action of eddy currents caused by mutual inductance, magnetic fields generated by back and forth oscillation between the 2 layers of copper nets are deflected and lost in the amorphous permalloy layers.
Under the same light weight condition, at least one layer of amorphous permalloy sheet is used, and compared with the prior art, the magnetic field loss is improved by nearly 10dB under the condition that only one layer of amorphous permalloy sheet is used, namely, the energy shielding efficiency is improved by 3 orders of magnitude (the conversion relation between decibel and energy is logarithmic), and the 10kHz magnetic field shielding efficiency reaches 34.1 dB.
As shown in figure 1, the specific scheme of the light composite material for efficiently shielding the low-frequency magnetic field is that a copper mesh and amorphous permalloy with high magnetic permeability and high magnetic saturation intensity are added simultaneously, and at least one layer of amorphous permalloy is arranged between 2 layers of copper meshes; wherein, amorphous permalloy is used as the loss of low-frequency magnetic field and the deflection functional layer of the magnetic induction line; in fig. 1, 1 represents an amorphous permalloy, 2 represents a copper mesh, and 3 represents a carbon fiber reinforced resin layer.
In a preferred embodiment, if the amorphous permalloy sheet has 2 or more layers, it is permissible that 1 or more layers of amorphous permalloy sheet are not sandwiched between two copper meshes;
in a preferred embodiment, an adhesive film or a brushing adhesive is attached to the surface of the amorphous permalloy sheet, the adhesive film can be used without being limited to an epoxy adhesive film, a cyanate adhesive film and the like, the type of the adhesive is not limited to epoxy adhesive, cyanate adhesive, polyurethane, benzoxazine, phenolic resin and the like, the purpose of the amorphous permalloy sheet adhesive film and the brushing adhesive is to improve the mechanical property of the whole composite material, the resin is co-cured with the copper mesh and the permalloy sheet, and the composite material is prevented from being firstly peeled from the amorphous permalloy under the condition of stress;
in a preferred embodiment, if the size of a single amorphous permalloy does not reach the overall size of a product and splicing is needed, the overlapping width of the amorphous permalloy is not less than 1.0mm, a resin bonding layer with the thickness of not more than 0.1mm is allowed between the overlapping parts, and the magnetic induction lines can be continuously deflected and uninterruptedly inside the amorphous permalloy;
in a preferred embodiment, a carbon fiber reinforced resin prepreg is used for compounding between the copper mesh and the amorphous permalloy, specifically, the carbon fiber reinforced resin prepreg (the resin in the carbon fiber reinforced resin prepreg is 20-80 wt.%, and the resin is not limited to epoxy glue, cyanate glue, polyurethane, benzoxazine, phenolic resin and the like) is used for infiltrating between the copper mesh and the amorphous permalloy and then curing is carried out, so that the compounding of the whole material is realized, and the copper mesh can be located at the outermost layer of the composite material.
In a preferred embodiment, the amorphous permalloy is prepared at a cooling rate of not less than 5000 ℃/s, is in an amorphous state and has a relative magnetic permeability of not less than 80000.
Example 1:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 60 meshes, the diameter of the copper wire is 0.1mm, the thickness of the permalloy sheet is 0.02mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy resin)/copper mesh/(T700/epoxy resin)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy resin);
in the embodiment, the overall size of the composite material is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 2:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 60 meshes, the diameter of the copper wire is 0.1mm, the thickness of the permalloy sheet is 0.04mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy)/copper mesh/(T700/epoxy)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy);
in the embodiment, the overall size of the composite material is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 3:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 60 meshes, the diameter of the copper wire is 0.1mm, the thickness of the permalloy sheet is 0.06mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy)/copper mesh/(T700/epoxy)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy);
in the embodiment, the overall size of the composite material is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 4:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 60 meshes, the diameter of the copper wire is 0.1mm, the thickness of the permalloy sheet is 0.08mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy resin)/copper mesh/(T700/epoxy resin)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy resin);
in the embodiment, the overall size of the composite material is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 5:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 100 meshes, the diameter of the copper wire is 0.07mm, the thickness of the permalloy sheet is 0.02mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy)/copper mesh/(T700/epoxy)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy);
the overall size of the composite material in the embodiment is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 6:
in this embodiment, the carbon fiber reinforced resin layer is T700/epoxy resin, the mesh number of the copper mesh is 200 meshes, the diameter of the copper wire is 0.05mm, the thickness of the permalloy sheet is 0.02mm, the mass percentage of nickel in the permalloy sheet is 50 ± 5 wt.%, and the sequence of each layer in the light composite material for efficiently shielding the low-frequency magnetic field is as follows:
(T700/epoxy)/copper mesh/(T700/epoxy)/amorphous permalloy sheet/(T700/epoxy)/copper mesh/(T700/epoxy);
in the embodiment, the overall size of the composite material is 655mm × 655mm × 1.5-5 mm, and the test standard is GJB 6190-.
Example 7:
the amorphous permalloy sheet of 0.02mm thickness was added 1 layer outside the copper mesh in example 1.
Comparative example 1:
the comparative example is different from example 1 only in that the amorphous permalloy piece in example 1 is replaced with a crystalline (area occupied by long-range ordered portion under metallographic microscope ≧ 60%) permalloy piece.
Comparative example 2:
the present comparative example is different from example 1 only in that the amorphous permalloy sheet in example 1 is removed.
Comparative example 3:
the present comparative example is different from example 1 only in that the positions of the amorphous permalloy sheet and the copper mesh in example 1 are interchanged.
The shielding effectiveness test results of the examples 1 to 7 and the comparative examples 1 to 3 are shown in table 1:
TABLE 1 Shielding effectiveness of the examples and comparative examples
As can be seen from the test data of examples 1 to 4 in Table 1, when the thickness of the amorphous permalloy is not less than 0.02mm, the thicker the amorphous permalloy, the better the shielding effect, and the permalloy thickness in examples 1 to 4 is substituted into the formula d (SE) 10 -31.15)/149 or formula d ═ SE 100 The difference between the theoretical value and the measured value of the shielding effectiveness calculated in 58.0)/146.5 is within +/-2.5 dB;
the test data of the examples 1, 5 and 6 in the table 1 show that the lower the mesh number of the copper wires, the thicker the copper wires, the better the shielding effect;
the test data of example 1 and comparative examples 1, 2 and 3 in table 1 show that the shielding effect of the amorphous permalloy sheet adopted by the invention is far better than that of the crystalline permalloy sheet, and meanwhile, the amorphous permalloy sheet is arranged between two copper nets, so that the loss of a magnetic field in a material can be increased, and the magnetic shielding effect is effectively improved, and example 7 shows that the amorphous permalloy sheet positioned between the two copper nets has the main effect when the multi-layer amorphous permalloy sheet exists.
In conclusion, the magnetic shielding structure has the advantages of good magnetic shielding effect, light weight and corrosion resistance. The density of the existing shielding material generally adopts a carbon steel plate with the density of 7.85g/cm 3 The density of the composite material of the invention is only 2.30g/cm 3 (ii) a Although the density of the composite shielding material of the existing magnetic material can be close to 2.30g/cm 3 However, the shielding effect of the 10kHz magnetic field is only 15-25 dB. Meanwhile, the carbon steel plate is easy to corrode, especially the electrochemical corrosion of carbon element and iron element caused by different electrochemical potentials, and the functional layer made of metal materials is sandwiched between the carbon fiber resin matrix composite materials, so that the corrosion condition does not exist.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the embodiments and implementations of the invention without departing from the spirit and scope of the invention, and are within the scope of the invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A light composite material for efficiently shielding a low-frequency magnetic field is characterized by comprising a carbon fiber reinforced resin layer, a permalloy sheet and a copper mesh; the permalloy sheet is in an amorphous state;
the number of layers of the permalloy sheets is more than or equal to 1, and the number of layers of the copper mesh is more than or equal to 2;
the carbon fiber reinforced resin layer, the permalloy sheet and the copper mesh are arranged in parallel;
at least one layer of permalloy sheet is positioned between two layers of copper meshes, and carbon fiber reinforced resin layers are respectively arranged between the permalloy sheet positioned between the two layers of copper meshes and the two layers of copper meshes.
2. The light composite material for efficiently shielding the low-frequency magnetic field according to claim 1, wherein the permalloy sheet has a relative permeability of more than or equal to 80000;
the thickness of the permalloy sheet is more than or equal to 0.02 mm; the mass percentage of nickel in the permalloy sheet is 35-90%.
3. The efficient shielding low-frequency magnetic field light composite material as claimed in claim 2, wherein the amorphous permalloy sheet is prepared at a cooling rate of not less than 5000 ℃/s.
4. The light composite material for efficiently shielding the low-frequency magnetic field according to claim 1, wherein the outermost layer of the light composite material for efficiently shielding the low-frequency magnetic field is a copper mesh or a carbon fiber reinforced resin layer;
carbon fiber reinforced resin layers are arranged between each layer of permalloy sheet and the adjacent permalloy sheet or copper net, and between each layer of copper net and the adjacent permalloy sheet or copper net.
5. The efficient low-frequency magnetic field shielding light composite material as claimed in claim 1, wherein an adhesive film is attached to the surface of the permalloy sheet or is subjected to brushing, the adhesive film is an epoxy adhesive film or a cyanate ester adhesive film, and the type of the adhesive used for brushing is one or more of epoxy adhesive, cyanate ester adhesive, polyurethane, benzoxazine or phenolic resin.
6. The efficient low-frequency magnetic field shielding light composite material as claimed in claim 1, wherein the mesh number of the copper mesh is more than or equal to 60 meshes, and the diameter of copper wires in the copper mesh is less than or equal to 0.1 mm.
7. The efficient low-frequency magnetic field shielding light composite material as claimed in claim 4, wherein the carbon fiber reinforced resin layer is obtained by impregnating each layer of permalloy sheet and the adjacent permalloy sheet or copper mesh, and each layer of copper mesh and the adjacent permalloy sheet or copper mesh with a carbon fiber reinforced resin prepreg and then curing the whole material.
8. The light composite material with high efficiency for shielding the low-frequency magnetic field is characterized in that the carbon fiber reinforced resin layer comprises a resin matrix and carbon fibers; the mass percentage of the resin matrix in the carbon fiber reinforced resin layer is 20-80%; the resin matrix is one or the combination of more than one of epoxy resin, cyanate ester, polyurethane, benzoxazine and phenolic resin.
9. The efficient low-frequency magnetic field shielding light composite material as claimed in claim 1, wherein when a single layer of permalloy sheet is formed by overlapping a plurality of smaller-sized permalloy sheets, the smaller-sized permalloy sheets are bonded by using a resin bonding layer with the thickness of 0.1mm or less, and the overlapping width of the smaller-sized permalloy sheets is 1.0mm or more.
10. The light composite material for efficiently shielding the low-frequency magnetic field according to claim 1, wherein the number of layers of the permalloy sheet is 1, the number of layers of the copper mesh is 2, and the mesh number of the copper mesh is 60;
thickness d of permalloy sheet according to shielding effectiveness SE at 10kHz magnetic field 10 Determining:
d＝(SE 10 -31.15)/149；
or thickness d of permalloy sheet according to shielding effectiveness SE at 100kHz magnetic field 100 Determining:
d＝(SE 100 -58.0)/146.5；
the unit of the thickness d of the permalloy sheet is mm, and the unit of the shielding effect is dB.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4344373A1 (en) * | 2022-09-21 | 2024-03-27 | Laird Technologies (Shenzhen) Ltd. | Electromagnetic energy mitigation assemblies and automotive vehicle components incluing the same |
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