CN114670526A - Wave-absorbing honeycomb core material and wave-absorbing honeycomb core sandwich structure - Google Patents

Wave-absorbing honeycomb core material and wave-absorbing honeycomb core sandwich structure Download PDF

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Publication number
CN114670526A
CN114670526A CN202011556668.6A CN202011556668A CN114670526A CN 114670526 A CN114670526 A CN 114670526A CN 202011556668 A CN202011556668 A CN 202011556668A CN 114670526 A CN114670526 A CN 114670526A
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wave
absorbing
honeycomb core
resin
layer
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刘若鹏
赵治亚
刘良点
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Luoyang Institute of Cutting Edge Technology
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Luoyang Institute of Cutting Edge Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/028—Paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • 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
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Abstract

The invention provides a wave-absorbing honeycomb core material and a wave-absorbing honeycomb core sandwich structure. The wave-absorbing honeycomb core material comprises a honeycomb matrix, a resin bonding part and a wave-absorbing material, wherein the wave-absorbing material is fixed on the honeycomb matrix by the resin bonding part and is a surface metallization hollow glass bead. The application uses the metalized hollow glass beads to replace dielectric materials and ferromagnetic materials commonly used as wave honeycomb core materials in the prior art as wave absorbing agents. The metal-coated hollow glass microspheres have the advantages of low density, large specific surface area and the like, and the metal is loaded on the hollow structure formed on the surfaces of the hollow glass microspheres, so that on one hand, the metal coating is thin, the skin effect caused by a metal material can be effectively reduced, electromagnetic waves can enter the wave-absorbing material, and the magnetic loss is effectively improved; on the other hand, after the electromagnetic waves enter the hollow microspheres, the electromagnetic waves are reflected for multiple times in the hollow microspheres, so that the absorption rate of the electromagnetic waves is further improved, and further, the low-frequency wave-absorbing performance is effectively improved.

Description

Wave-absorbing honeycomb core material and wave-absorbing honeycomb core sandwich structure
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to a wave-absorbing honeycomb core material and a wave-absorbing honeycomb core sandwich structure.
Background
The structural stealth material has various structural forms, such as a laminated structure, a laminated composite structure, a sandwich structure and the like. The sandwich structure composite material is a typical structural design scheme with light weight, high strength and high rigidity, organically combines the high strength and high modulus of the panel with the low density and high rigidity of the sandwich core, and has extremely important application value in the fields of aerospace and the like.
The stealth design and manufacture of sandwich structures is a new technology today, foam and honeycomb being the most important two forms. The wave-absorbing honeycomb sandwich structure wave-absorbing composite material is prepared by uniformly dispersing an absorbent in a resin solution to obtain a wave-absorbing resin glue solution, soaking a honeycomb core in the wave-absorbing resin glue solution for multiple times, curing to obtain the wave-absorbing honeycomb sandwich, and gluing the wave-absorbing honeycomb sandwich, a wave-transmitting skin, a reflecting layer and the like to obtain the wave-absorbing composite material with the honeycomb sandwich structure. Most of the absorbent is a dielectric absorbent such as carbon black, graphene, carbon nanotubes and the like, the density of the absorbent is small, the absorbent can be uniformly dispersed in glue solution, the wave-absorbing bandwidth of the composite material is widened through reasonable gradient design, and the low-frequency wave-absorbing performance is not ideal. When a ferromagnetic material is used as the absorbent, the density of the absorbent is high, the absorbent is easy to settle in the solvent dispersion, flow coating and impregnation processes, the preparation process is limited, and the wave absorbing effect is not ideal.
Disclosure of Invention
The invention mainly aims to provide a wave-absorbing honeycomb core material and a wave-absorbing honeycomb core sandwich structure, and aims to solve the problems that the wave-absorbing frequency width of the honeycomb sandwich structure is narrow and the low-frequency wave-absorbing performance is insufficient in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a wave honeycomb core material including a honeycomb base body, a resin bonding portion and a wave-absorbing material, the resin bonding portion fixing the wave-absorbing material on the honeycomb base body, the wave-absorbing material being surface-metalized hollow glass beads.
Further, the surface metallization hollow glass bead is selected from one or more of Ni-plated hollow glass bead, Fe-plated hollow glass bead and Co-plated hollow glass bead, and the thickness of the metal layer is preferably 0.02-1.
Furthermore, the D90 of the wave-absorbing material is between 5 and 15 mu m.
Furthermore, in the wave-absorbing honeycomb core material, the weight ratio of the honeycomb matrix to the resin bonding part to the wave-absorbing material is 20-40: 30-50: 10-20.
Further, the resin bonding portion is formed by curing one or more of a hot-melt epoxy resin, a hot-melt phenol resin, and a hot-melt bismaleimide resin.
Further, the honeycomb substrate is aramid paper honeycomb.
According to another aspect of the invention, the wave-absorbing honeycomb core sandwich structure comprises a wave-transmitting layer, a wave-absorbing honeycomb core layer and a reflecting layer which are sequentially bonded, wherein the wave-absorbing honeycomb core layer is any one of the wave-absorbing honeycomb core materials, and the preferred wave-absorbing honeycomb core layer is 5-20 mm in thickness.
Further, the thickness of the wave-transmitting layer is 0.2-1.0 mm, the wave-transmitting layer comprises a first fiber matrix and first resin loaded on the first fiber matrix, the weight content of the first resin in the wave-transmitting layer is preferably 33-45%, the fiber matrix is preferably quartz fiber or glass fiber, and the first resin is epoxy resin or cyanate ester.
Further, above-mentioned inhale ripples honeycomb core sandwich structure still includes the absorbing layer of bonding setting between absorbing ripples honeycomb sandwich layer and reflection stratum, and the thickness on preferred absorbing layer is 1.0 ~ 3.0mm, and absorbing layer includes second fibre base member, second resin and the absorbent of load on second fibre base member, and the weight ratio of second fibre base member, second resin and absorbent is 15 ~ 30: 15-30: 40-70, preferably the second resin is hot-melt epoxy resin or bismaleimide resin, preferably the second fiber matrix is quartz fiber or aramid fiber, preferably the wave absorber is a magnetic medium wave absorber, preferably the D90 of the magnetic medium wave absorber is between 1 and 10 micrometers, and preferably the magnetic medium wave absorber comprises one or more of ferrite, carbonyl iron powder and superfine metal powder.
Further, the thickness of the reflecting layer is 0.2-0.6 mm, the reflecting layer comprises carbon fibers and epoxy resin loaded on the carbon fibers, and the weight content of the epoxy resin in the reflecting layer is 33-50%.
By applying the technical scheme of the invention, the metalized hollow glass beads are used as the wave-absorbing material, so that on one hand, the skin effect caused by the metal material can be effectively reduced, the electromagnetic waves can enter the wave-absorbing material, and the magnetic loss is effectively improved; on the other hand, after the electromagnetic waves enter the hollow microspheres, the electromagnetic waves are reflected for multiple times in the hollow microspheres, so that the absorption rate of the electromagnetic waves is further improved, and further, the low-frequency wave-absorbing performance is effectively improved. Meanwhile, after the metal layer is coated on the hollow glass beads to serve as the wave-absorbing material, when the wave-absorbing material is loaded on the honeycomb matrix, the metal is effectively prevented from being settled, and the effect of uniform distribution on the honeycomb carrier as far as possible is realized. In conclusion, the wave-absorbing honeycomb core material provided by the application utilizes the wave-absorbing material and the honeycomb carrier which are uniformly distributed, and realizes the simultaneous absorption of low-frequency waves and high-frequency waves.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As described in the background of the present application, dielectric absorbents such as graphene and carbon nanotubes have unsatisfactory low-frequency wave-absorbing properties. When the ferromagnetic material is used as the absorbent, the density of the absorbent is high, the absorbent is easy to settle in the solvent dispersion, flow coating and dipping processes, the preparation process is limited, and the wave absorbing effect is not ideal. In addition, for the metal wave absorbing agent in the prior art, the metal wave absorbing agent is generally solid particles (3-5 μm or more) with larger particle size or flaky particles with thicker thickness (more than 1 μm), so that a skin effect can be generated, that is, under an alternating electric field, current can be generated on the surface of the metal wave absorbing agent and can be made into eddy current, when incident electromagnetic waves enter, reflection can be generated, so that less electromagnetic waves enter the material, the electromagnetic loss is reduced, and the wave absorbing performance is poor. Therefore, the honeycomb sandwich structure in the prior art has the problems of narrow wave-absorbing bandwidth and insufficient low-frequency wave-absorbing performance. In order to solve the problems, the application provides a wave-absorbing honeycomb core material and a wave-absorbing honeycomb core sandwich structure.
In a typical embodiment of the present application, a wave-absorbing honeycomb core material is provided, which includes a honeycomb base body, a resin bonding portion and a wave-absorbing material, wherein the wave-absorbing material is fixed on the honeycomb base body by the resin bonding portion, and the wave-absorbing material is a surface-metalized hollow glass bead.
The application uses the metallized hollow glass beads to replace dielectric materials and ferromagnetic materials which are commonly used as wave honeycomb core materials in the prior art as wave absorbing agents. The metal-coated hollow glass microspheres have the advantages of low density, large specific surface area and the like, and the metal is loaded on the hollow structure formed on the surfaces of the hollow glass microspheres, so that on one hand, the metal coating is thin, the skin effect caused by a metal material can be effectively reduced, electromagnetic waves can enter the wave-absorbing material, and the magnetic loss is effectively improved; on the other hand, after entering the hollow microspheres, the electromagnetic waves are reflected for multiple times inside the hollow microspheres, so that the absorptivity of the electromagnetic waves is further improved, and the low-frequency wave-absorbing performance is further effectively improved. Meanwhile, after the metal layer is coated on the hollow glass beads to serve as the wave-absorbing material, when the wave-absorbing material is loaded on the honeycomb matrix, the metal is effectively prevented from being settled, and the effect of uniform distribution on the honeycomb carrier as far as possible is realized. In conclusion, the wave-absorbing honeycomb core material provided by the application utilizes the wave-absorbing material and the honeycomb carrier which are uniformly distributed, and realizes the simultaneous absorption of low-frequency waves and high-frequency waves.
The metal coating can be made of metal materials commonly used for wave absorption in the prior art, and preferably, the surface metallization hollow glass beads are selected from any one or more of Ni-plated hollow glass beads, Fe-plated hollow glass beads and Co-plated hollow glass beads. Ni, Fe and Co have good conductivity and ferromagnetism, so that the wave-absorbing performance of the wave-absorbing material can be effectively improved. In order to further control the skin effect of the metal material, the thickness of the metal layer is preferably 0.02-1 μm.
In order to ensure that the wave-absorbing material has better dispersibility in the honeycomb matrix and can be controllably and uniformly dispersed in the honeycomb matrix, the D90 of the wave-absorbing material is preferably between 5 and 15 mu m. The wave-absorbing material having the above particle size range facilitates dispersion thereof in the honeycomb matrix and facilitates bonding.
In one embodiment, in the wave-absorbing honeycomb core material, the weight ratio of the honeycomb matrix to the resin bonding part to the wave-absorbing material is preferably 20-40: 30-50: 10-20. By limiting the weight ratio, the characteristics of light weight and excellent wave-absorbing performance of the wave honeycomb core material can be considered, and meanwhile, the specific resin bonding part and the wave-absorbing material are in proportion, so that the wave-absorbing material can be stably bonded on the surface of the honeycomb matrix, and the structural stability is further improved. In conclusion, by further limiting the weight ratio of the components, the wave-absorbing honeycomb core material has light weight and excellent wave-absorbing performance, and meanwhile, the structural stability of the wave-absorbing honeycomb core material is improved.
The resin bonding part can be made of various adhesives commonly used for bonding wave-absorbing materials in the prior art, and is preferably formed by curing one or more of hot-melt epoxy resin, hot-melt phenolic resin or hot-melt bismaleimide resin in order to adapt to the physical property characteristics of the surface metalized hollow glass bead. The resin is solid or semi-solid at normal temperature, can be softened to a molten state after being heated, and can be used for preparing a prepreg by a dry method. In addition, the resin contains a latent curing agent, can be directly cured at high temperature, has good processing performance and good adhesion, and can firmly adhere the metallized hollow glass microspheres to the surface of the honeycomb substrate.
Any material with a honeycomb structure in the prior art can be considered as the honeycomb substrate of the application, and in order to meet the requirements of light weight, high strength, better synergy with surface metallization hollow glass beads and various application scene requirements, the aramid fiber paper honeycomb is preferably used as the honeycomb substrate.
The preparation method of the wave-absorbing honeycomb core material in the application can refer to the preparation method of the wave-absorbing honeycomb core material in the prior art, for example, by means of dipping and the like, in order to more conveniently prepare the wave-absorbing honeycomb core material by a person skilled in the art, the following preparation method is exemplarily described:
dissolving hot-melt resin in a solvent, adding a dispersing agent and surface metalized hollow glass beads, and mechanically stirring to obtain a wave-absorbing resin glue solution; spraying and dipping the glue solution on the honeycomb core for multiple times, drying and weighing until the target weight gain is achieved; and placing the soaked honeycomb core in an oven for curing to obtain the wave-absorbing honeycomb core material.
It should be understood by those skilled in the art that the above preparation method is only illustrative and does not mean that the wave-absorbing honeycomb core material of the present application can be obtained only by the above method.
In another typical embodiment of the application, a wave-absorbing honeycomb core sandwich structure is provided, which comprises a wave-transmitting layer, a wave-absorbing honeycomb core layer and a reflecting layer which are sequentially bonded, wherein the wave-absorbing honeycomb core layer is any one of the wave-absorbing honeycomb core materials, and the preferred wave-absorbing honeycomb core layer has a thickness of 5-20 mm.
By the wave-absorbing honeycomb core material, besides the requirement of the wave-absorbing honeycomb core sandwich structure on the light quality of the wave-absorbing honeycomb core layer is met, the metalized hollow glass beads with low density and large specific surface area are used as a wave-absorbing agent, so that the low-frequency wave-absorbing and broadband wave-absorbing performances are realized, and therefore, the wave-absorbing performance of the wave-absorbing honeycomb core sandwich structure with the wave-absorbing honeycomb core material is effectively improved.
In order to achieve a synergistic effect by means of synergistic effect with the wave-absorbing honeycomb core material, the wave-transmitting layer preferably has a thickness of 0.2-1.0 mm, the wave-transmitting layer comprises a first fiber substrate and first resin loaded on the first fiber substrate, the first resin in the wave-transmitting layer preferably has a weight content of 33% -45%, the fiber substrate preferably is quartz fiber or glass fiber, and the first resin is epoxy resin or cyanate ester. The wave-transmitting layer has stronger rigidity and strength, can protect the wave-absorbing honeycomb core material, and enables incident electromagnetic waves to enter the wave-absorbing honeycomb core material and the wave-absorbing layer as far as possible to be fully absorbed.
In one embodiment, preferably inhale ripples honeycomb core sandwich structure still includes the absorbing layer of bonding setting between absorbing the ripples honeycomb sandwich layer and reflection stratum, and the thickness of further preferred above-mentioned absorbing layer is 1.0 ~ 3.0mm, and the absorbing layer includes second fibre base member, second resin and the absorbent of load on second fibre base member, and the weight ratio of second fibre base member, second resin and absorbent is 15 ~ 30: 15-30: 40-70, preferably the second resin is hot-melt epoxy resin or bismaleimide resin, preferably the second fiber matrix is quartz fiber or aramid fiber, preferably the wave absorber is a magnetic medium wave absorber, preferably the D90 of the magnetic medium wave absorber is between 1 and 10 mu m, and preferably the magnetic medium wave absorber comprises one or more of ferrite, carbonyl iron powder and superfine metal powder. The wave absorbing layer can play a role in improving the wave absorbing performance of the whole sandwich structure as the supplement of the wave absorbing honeycomb, so that the conventional wave absorbing layer capable of realizing the wave absorbing effect in the prior art can be considered and applied to the wave absorbing honeycomb. The wave absorbing layer can further improve the wave absorbing effect of the wave absorbing honeycomb core sandwich structure, so that incident electromagnetic waves are absorbed as far as possible.
The effect of above-mentioned reflection stratum mainly can inhale ripples honeycomb sandwich layer realization to its further absorption in order to not absorb the frequency channel reflection of absorption, therefore the conventional reflection stratum that can realize above-mentioned reflection effect among the prior art all can consider to be applied to this application, in order can with the wave-absorbing honeycomb core synergistic effect of this application, reach synergistic effect, the thickness of reflection stratum is 0.2 ~ 0.6mm, the reflection stratum includes carbon fiber and the epoxy of load at the carbon fiber, epoxy's weight content is 33 ~ 50% in the reflection stratum. The reflecting layer has stronger rigidity and strength on one hand, and can protect the wave-absorbing honeycomb core layer, and on the other hand, the electromagnetic waves which are not absorbed by the wave-absorbing layer and the wave-absorbing honeycomb core layer are reflected back to the wave-absorbing layer and the wave-absorbing honeycomb core layer, so that the electromagnetic waves can be absorbed to the maximum extent.
The bonding material used for bonding each layer structure in the wave-absorbing honeycomb core sandwich structure can be the bonding material commonly used in the wave-absorbing honeycomb sandwich structure, and is not described again here.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 2
(1) Dissolving hot-melt phenolic resin in an ethanol solvent, adding Fe-plated hollow glass beads (the grain diameter D90 of the Fe-plated hollow glass beads is 5 microns, the average thickness of an iron layer on the surfaces of the hollow beads is 0.8 microns as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 10mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of glass fiber reinforced epoxy resin composite material, the resin content is 33 percent, and the thickness is 1.0 mm. The fiber matrix of the wave-absorbing layer is an aramid fiber reinforced epoxy resin composite material with the thickness of 3.0mm, wherein the dispersed absorbent is carbonyl iron powder with the particle size D90 of 5 mu m. The wave-absorbing layer comprises the following components in parts by weight: 30 parts of resin, 30 parts of fiber and 60 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 50%, and the thickness is 0.6 mm.
Example 3
(1) Dissolving hot-melt bismaleimide resin in an acetone solvent, adding Co-plated hollow glass beads (the particle size D90 of the Co-plated hollow glass beads is 15 microns, the average thickness of a cobalt layer on the surfaces of the hollow beads is 0.9 microns as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 20mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing at 200 ℃ for 240min to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core is prepared by the following steps: 20 parts of honeycomb, 15 parts of absorbing material and 30 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 45%, and the thickness is 0.2 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin matrix composite material with the thickness of 1.5mm, wherein the dispersed absorbent is ferrite, and the particle size D90 is 10 mu m. The wave-absorbing layer comprises the following components in parts by weight: 30 parts of resin, 15 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.2 mm.
Example 4
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Co-plated hollow glass beads (the particle size D90 of the Co-plated hollow glass beads is 8 microns, the average thickness of a cobalt layer on the surfaces of the hollow beads is 0.75 microns and serves as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 15mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 40 parts of honeycomb, 20 parts of absorbing material and 50 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced epoxy resin composite material, the resin content is 40%, and the thickness is 0.5 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 1.0mm, wherein the used absorbent for dispersion is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 1 mu m. The wave-absorbing layer comprises the following components in parts by weight: 30 parts of resin, 25 parts of fiber and 70 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 45%, and the thickness is 0.3 mm.
Example 5
(1)
Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.6 microns and is used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of a quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 15 parts of resin, 15 parts of fiber and 40 parts of absorbent. The resin content of the reflecting layer is 33 percent, and the thickness is 0.4 mm.
Example 6
Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 35 parts of honeycomb, 5 parts of absorbent and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 7
Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 15 parts of honeycomb, 25 parts of absorbent and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of a quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 8
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 15 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 9
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 5 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing at 180 ℃ for 120min to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core is prepared by the following steps: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 10
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 20 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.5 microns and is used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 11
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 0.02 microns and is used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 12
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 1 micron and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 13
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surfaces of the hollow beads is 1.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Example 14
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding Ni-plated hollow glass beads (the particle size D90 of the Ni-plated hollow glass beads is 10 microns, the average thickness of a nickel layer on the surface of the hollow beads is 0.5 microns and the Ni-plated hollow glass beads are used as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1) and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Comparative example 1
(1) Dissolving hot-melt epoxy resin in N, N-dimethylacetamide solvent, adding superconducting carbon black (D90 is 25nm, resistivity is 0.3 omega. m, and is used as wave-absorbing material), and mechanically stirring for 60min to obtain wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of a quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Comparative example 2
(1) Dissolving hot-melt epoxy resin in an N, N-dimethylacetamide solvent, adding carbonyl iron powder (D90 is 10 micrometers as a wave-absorbing material), and mechanically stirring for 60min to obtain a wave-absorbing resin glue solution; repeatedly spraying and dipping the glue solution on an aramid paper honeycomb core with the thickness of 5mm, drying and weighing until the target weight gain is achieved; placing the impregnated aramid fiber paper honeycomb core in an oven, curing for 120min at 180 ℃ to obtain a wave-absorbing honeycomb core, wherein the wave-absorbing honeycomb core comprises the following components in parts by weight: 30 parts of honeycomb, 10 parts of wave-absorbing material and 40 parts of resin.
(2) And (2) preparing by adopting an autoclave process, and cementing and curing the wave-transmitting layer, the wave-absorbing honeycomb core obtained in the step (1), the wave-absorbing layer and the reflecting layer from top to bottom through a structural adhesive film to obtain the wave-absorbing honeycomb core sandwich structure. Wherein the wave-transmitting layer is made of a quartz fiber reinforced cyanate ester composite material, the resin content is 38%, and the thickness is 0.6 mm. The fiber matrix of the wave-absorbing layer is a quartz fiber reinforced bismaleimide resin composite material with the thickness of 2.4mm, wherein the dispersed absorbent is superfine iron-aluminum-silicon alloy micro powder, and the particle size D90 is 8 mu m. The wave-absorbing layer comprises the following components in parts by weight: 20 parts of resin, 20 parts of fiber and 45 parts of absorbent. The reflecting layer is made of carbon fiber reinforced epoxy resin matrix composite material, the resin content is 40%, and the thickness is 0.4 mm.
Testing wave-absorbing performance
The wave-absorbing honeycomb core sandwich structure prepared by the embodiment and the comparative example is tested for wave-absorbing performance by referring to a GJB 2038A-2011 radar wave-absorbing material reflectivity test method. Wherein the sample size is 300 x 300mm and the frequency is 2-18 GHz.
The test results are shown in table 1.
TABLE 1
Attenuating peak frequency (GHz) Attenuation peak (db) Attenuation 10db Bandwidth (GHz)
Example 1 6.2 -24.8 3.2
Example 2 4.8 -32.1 4.8
Example 3 3.9 -35.0 5.4
Example 4 5.2 -30.8 4.1
Example 5 6.0 -26.8 3.4
Example 6 9.3 -14.2 1.7
Example 7 8.4 -20.5 2.3
Example 8 6.4 -21.5 3.0
Example 9 6.6 -22.3 3.1
Example 10 7.9 -18.7 2.4
Example 11 6.3 -23.9 3.3
Example 12 7.1 -19.3 2.4
Examples13 8.3 -14.4 2.0
Example 14 11.4 -11.9 1.2
Comparative example 1 10.4 -12.9 1.5
Comparative example 2 11.8 -11.9 1.3
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the application uses the metalized hollow glass beads to replace dielectric materials and ferromagnetic materials commonly used as wave honeycomb core materials in the prior art as wave absorbing agents. The metal-coated hollow glass microspheres have the advantages of low density, large specific surface area and the like, and the skin effect caused by metal materials can be effectively reduced by loading metal on the surfaces of the hollow glass microspheres, so that the defect of weak absorption of high-frequency electromagnetic waves is overcome, the magnetic loss is also effectively improved, and the low-frequency wave-absorbing performance is further effectively improved. Meanwhile, after the metal layer is coated on the hollow glass beads to serve as the wave-absorbing material, when the wave-absorbing material is loaded on the honeycomb matrix, the metal is effectively prevented from being settled, and the effect of uniform distribution on the honeycomb carrier as far as possible is realized. In conclusion, the wave-absorbing honeycomb core material provided by the application utilizes the wave-absorbing material and the honeycomb carrier which are uniformly distributed, and realizes the simultaneous absorption of low-frequency waves and high-frequency waves.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A wave-absorbing honeycomb core material comprises a honeycomb matrix, a resin bonding part and a wave-absorbing material, wherein the wave-absorbing material is fixed on the honeycomb matrix through the resin bonding part, and the wave-absorbing material is a surface metallization hollow glass bead.
2. The wave-absorbing honeycomb core material according to claim 1, wherein the surface metalized hollow glass beads are selected from any one or more of Ni-plated hollow glass beads, Fe-plated hollow glass beads and Co-plated hollow glass beads, and preferably the thickness of the metal coating is 0.02-1 μm.
3. The wave-absorbing honeycomb core material according to claim 1 or 2, wherein the D90 of the wave-absorbing material is 5-15 μm.
4. The wave-absorbing honeycomb core material according to claim 1, wherein the weight ratio of the honeycomb matrix to the resin bonding part to the wave-absorbing material is 20-40: 30-50: 10-20.
5. The wave absorbing honeycomb core material according to claim 1, wherein the resin bonding part is cured from one or more of a hot melt epoxy resin, a hot melt phenolic resin or a hot melt bismaleimide resin.
6. The wave-absorbing honeycomb core material of claim 1, wherein the honeycomb matrix is an aramid paper honeycomb.
7. A wave-absorbing honeycomb core sandwich structure comprises a wave-transmitting layer, a wave-absorbing honeycomb core layer and a reflecting layer which are sequentially bonded, and is characterized in that the wave-absorbing honeycomb core layer is the wave-absorbing honeycomb core material in any one of claims 1 to 6, and the wave-absorbing honeycomb core layer is preferably 5-20 mm thick.
8. The wave-absorbing honeycomb core sandwich structure according to claim 7, wherein the thickness of the wave-transmitting layer is 0.2-1.0 mm, the wave-transmitting layer comprises a first fiber matrix and a first resin loaded on the first fiber matrix, preferably, the first resin in the wave-transmitting layer is 33-45% by weight, preferably, the fiber matrix is quartz fiber or glass fiber, and the first resin is epoxy resin or cyanate ester.
9. The wave-absorbing honeycomb core sandwich structure according to claim 7, further comprising a wave-absorbing layer bonded between the wave-absorbing honeycomb core layer and the reflecting layer, preferably the wave-absorbing layer has a thickness of 1.0-3.0 mm, the wave-absorbing layer comprises a second fiber base body, second resin loaded on the second fiber base body, and a wave-absorbing agent, wherein the weight ratio of the second fiber base body, the second resin, and the wave-absorbing agent is 15-30: 15-30: 40-70, preferably, the second resin is hot-melt epoxy resin or bismaleimide resin, preferably, the second fiber matrix is quartz fiber or aramid fiber, preferably, the wave absorbing agent is a magnetic medium wave absorbing agent, preferably, the D90 of the magnetic medium wave absorbing agent is between 1 and 10 micrometers, and preferably, the magnetic medium wave absorbing agent comprises one or more of ferrite, carbonyl iron powder and superfine metal powder.
10. The wave-absorbing honeycomb core sandwich structure according to claim 7, wherein the thickness of the reflecting layer is 0.2-0.6 mm, the reflecting layer comprises carbon fibers and epoxy resin loaded on the carbon fibers, and the weight content of the epoxy resin in the reflecting layer is 33-50%.
CN202011556668.6A 2020-12-24 2020-12-24 Wave-absorbing honeycomb core material and wave-absorbing honeycomb core sandwich structure Pending CN114670526A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115925334A (en) * 2022-11-22 2023-04-07 西南石油大学 High-titanium slag-based foamed geopolymer electromagnetic absorption material and preparation method thereof
CN116496540A (en) * 2023-05-25 2023-07-28 大连理工大学 Magnetized solid buoyancy material adopting novel foaming agent and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115925334A (en) * 2022-11-22 2023-04-07 西南石油大学 High-titanium slag-based foamed geopolymer electromagnetic absorption material and preparation method thereof
CN116496540A (en) * 2023-05-25 2023-07-28 大连理工大学 Magnetized solid buoyancy material adopting novel foaming agent and preparation method thereof
CN116496540B (en) * 2023-05-25 2024-05-10 大连理工大学 Magnetized solid buoyancy material adopting foaming agent and preparation method thereof

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