CN110978707A - Light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate and preparation method thereof - Google Patents
Light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of wave-absorbing materials, and discloses a light broadband multi-band strong-absorption double-layer structure honeycomb wave-absorbing plate and a preparation method thereof, wherein the light broadband multi-band strong-absorption double-layer structure honeycomb wave-absorbing plate is sequentially provided with an upper skin, a surface wave-absorbing honeycomb core, an adhesive layer, a bottom wave-absorbing honeycomb core, a bottom skin and a reflecting layer which are adhered to each other from top to bottom; the surface layer wave-absorbing honeycomb core is impregnated with a first wave-absorbing coating, the bottom layer wave-absorbing honeycomb core is sprayed with a second wave-absorbing coating, and the outer side of the second wave-absorbing coating is impregnated with the first wave-absorbing coating. According to the invention, the honeycomb is sprayed and impregnated by using the wave-absorbing coating, and the upper skin, the surface wave-absorbing honeycomb, the bottom skin and the reflecting layer are subjected to impedance matching design, so that the wave-absorbing strength is further improved and the wave-absorbing frequency band is widened under the condition of meeting the environmental use requirements, the frequency band of the honeycomb wave-absorbing plate can be widened, and the absorption peak strength of the honeycomb wave-absorbing plate can be improved.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a light broadband multi-band strong-absorption double-layer-structure honeycomb wave-absorbing plate and a preparation method thereof.
Background
The radar wave-absorbing material is one of important materials for applying weaponry, is always a key point at the leading edge of national defense science and technology, can reduce the reflection and scattering of electromagnetic waves through self absorption and attenuation, realizes the loss of the electromagnetic waves, further greatly reduces the radar scattering interface (RSC) of a target, and improves the survival defense capability and the overall operational capability of the target.
The radar wave-absorbing material can be divided into a coating type and a structural type according to the material forming process and the bearing capacity, and the structural type radar wave-absorbing material is a multifunctional composite material which can be used as a structural member, has the advantages of light weight and high strength of the composite material and has excellent wave-absorbing performance.
The research on the stealth material of the aramid fiber paper honeycomb sandwich structure is carried out by the domestic research institute and colleges early in the 90 s, and the wave-absorbing honeycomb sandwich composite material is formed by spraying or soaking a certain wave-absorbing coating on the honeycomb wall and finally covering skins on the upper surface and the lower surface of a honeycomb core. The wave-absorbing honeycomb sandwich structure is characterized in that the honeycomb surface can receive or transmit electromagnetic waves, and the wave-absorbing honeycomb sandwich structure becomes an important development direction of the current stealth material.
The method for preparing the honeycomb wave absorbing plate in the prior art comprises the following steps: 1) the surface of the single-layer honeycomb is impregnated or sprayed with a wave-absorbing coating, and the prepared honeycomb wave-absorbing plate has the characteristics of narrow wave-absorbing frequency band or low wave-absorbing strength and the like; 2) by adopting a multilayer wave-absorbing honeycomb structure, although the wave-absorbing strength can be improved and the wave-absorbing frequency band can be widened, the wave-absorbing honeycomb structure has the characteristics of complex process, increased cost and the like.
Aiming at the problems, the invention adopts a double-layer honeycomb core structure, designs magnetic loss wave-absorbing coating and electric loss wave-absorbing coating with different weights on the surface layer honeycomb core and the bottom layer honeycomb core by using an impedance matching technology through simulation design, and obtains the light broadband multiband strong-absorption honeycomb wave-absorbing plate. By designing wave-absorbing coatings of different types and different weights on the double-layer structure honeycomb core, the honeycomb wave-absorbing plate has excellent wave-absorbing performance in L, S, C, X, Ku and Ka wave bands, the problems that the existing single-layer wave-absorbing plate only has strong absorption in a certain wave band and the process of the multi-layer structure honeycomb wave-absorbing plate is complex are solved, and meanwhile, the process is simple to operate, stable in performance, low in cost and high in commercial value.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a light broadband multi-band strong absorption double-layer structured honeycomb wave absorption plate and a preparation method thereof.
The light broadband multi-band strong absorption double-layer structure honeycomb wave absorption plate is sequentially provided with an upper skin, a surface wave absorption honeycomb core, an adhesive layer, a bottom wave absorption honeycomb core, a bottom skin and a reflecting layer which are adhered to each other from top to bottom;
the surface layer wave absorbing honeycomb core is dipped with a first wave absorbing coating, the bottom layer wave absorbing honeycomb core is sprayed with a second wave absorbing coating, and the outer side of the second wave absorbing coating is dipped with the first wave absorbing coating.
Furthermore, the surface wave-absorbing honeycomb core and the bottom wave-absorbing honeycomb core are made of aramid fiber paper honeycombs, and the honeycomb cores are hexagonal.
Further, the absorbent adopted by the first wave-absorbing coating is carbon black.
Further, the absorbent adopted by the second wave-absorbing coating is carbonyl iron powder with high magnetic permeability.
Further, the reflecting layer is an aluminum plate or a carbon fiber reflecting plate.
Further, the first wave absorbing coating comprises the following components in parts by mass: 9-10 parts of carbon black, 110 parts of adhesive 100-.
Further, the second wave-absorbing coating comprises the following components in parts by mass: 80-85 parts of carbonyl iron powder, 15-20 parts of adhesive and 20-30 parts of solvent.
Further, the first wave-absorbing coating in the surface layer honeycomb core is designed to have the weight: 280-300g/m2。
Further, in the bottom honeycomb coreWeight of the first wave-absorbing coating: 700-750g/m2The weight of the second wave-absorbing coating is 450-2。
The invention also aims to provide a preparation method of the light broadband multiband strong absorption double-layer structure honeycomb wave absorption plate, which comprises the following steps:
1) preparing a surface wave-absorbing honeycomb core: dipping the honeycomb core with the first wave-absorbing coating, weighing after surface drying, and completely curing after repeated dipping to reach the designed weight;
2) preparing a bottom wave-absorbing honeycomb core: spraying a second wave-absorbing coating on the surface of the honeycomb core, completely curing after the surface is dried to reach the design weight, then soaking the first wave-absorbing coating, and completely curing after the surface is dried to reach the design weight;
3) preparing a honeycomb wave-absorbing plate: paving two layers of 0.2mm prepreg, a bottom wave-absorbing honeycomb core, 0.2mm prepreg, a surface wave-absorbing honeycomb core and two layers of 0.2mm prepreg in sequence, then curing and molding under a hot press, and finally, carrying out hot-pressing adhesion on the molded honeycomb wave-absorbing plate and the reflecting plate through an adhesive to obtain the honeycomb wave-absorbing plate.
Further, the time for dipping the first wave absorption coating in the step 1) and the step 2) is 2-3min, and the absorbent in the first wave absorption coating is carbon black.
Further, the absorbent in the second wave-absorbing coating in the step 2) is carbonyl iron powder with high magnetic permeability.
Further, the reflecting plate in the step 3) is an aluminum plate or a carbon fiber reflecting plate.
In summary, the advantages and positive effects of the invention are:
the invention adopts the magnetic loss and electric loss wave-absorbing coating at the same time, designs the weights of different wave-absorbing coatings by utilizing simulation design and impedance matching technology, and has important significance for improving the bandwidth and wave-absorbing strength of the honeycomb wave-absorbing plate. The method solves the problems of poor wave-absorbing strength, narrow bandwidth and the like of the single-layer honeycomb wave-absorbing plate, solves the problems of complex multi-layer honeycomb wave-absorbing process, cost increase and the like, and has the advantages of simple process, strong controllability, low cost and important commercial application value.
According to the invention, the honeycomb core with a double-layer structure is adopted, the honeycomb is sprayed and impregnated by using the wave-absorbing coating, and the wave-absorbing strength is further improved and the wave-absorbing frequency band is widened under the condition of meeting the environmental use requirement by carrying out impedance matching design on the upper skin, the surface wave-absorbing honeycomb, the bottom skin and the reflecting layer.
Drawings
Fig. 1 is a schematic diagram of a structure of a lightweight broadband multiband strongly-absorbing double-layer-structured honeycomb wave-absorbing plate provided by an embodiment of the invention.
In the figure: 1. an upper skin; 2. the surface layer wave-absorbing honeycomb core; 3. an adhesive layer; 4. a bottom wave-absorbing honeycomb core; 5. a bottom skin; 6. and a reflective layer.
FIG. 2 is an effect diagram of a lightweight broadband multiband strongly-absorbing double-layer structured honeycomb wave-absorbing plate provided by an embodiment of the present invention.
Fig. 3 is a flowchart of a method for manufacturing a lightweight broadband multiband strongly-absorbing double-layer structured honeycomb wave-absorbing plate according to an embodiment of the present invention.
Fig. 4 is a typical reflectivity graph of a honeycomb wave absorbing plate with a double-layer structure in example 3 according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The existing wave-absorbing cellular board has the problems of poor wave-absorbing performance, narrow bandwidth, complex process and the like.
To solve the above technical problems, the present invention will be further described with reference to specific embodiments.
As shown in fig. 1, the light broadband multiband strong absorption double-layer structured honeycomb wave absorption plate provided by the embodiment of the invention is sequentially provided with an upper skin 1, a surface wave absorption honeycomb core 2, an adhesive layer 3, a bottom wave absorption honeycomb core 4, a bottom skin 5 and a reflection layer 6 which are bonded with each other from top to bottom.
The surface of the surface wave-absorbing honeycomb core 2 is impregnated with a first wave-absorbing coating, the surface of the bottom wave-absorbing honeycomb core 4 is sprayed with a second wave-absorbing coating, and the outer side of the second wave-absorbing coating is impregnated with the first wave-absorbing coating.
In the embodiment of the invention, the surface wave-absorbing honeycomb core and the bottom wave-absorbing honeycomb core are made of aramid fiber paper honeycombs, and the honeycomb core is hexagonal.
In the embodiment of the invention, the absorbent used in the first wave-absorbing coating is carbon black.
In the embodiment of the invention, the absorbent adopted by the second wave-absorbing coating is carbonyl iron powder with high magnetic permeability.
In the present embodiment, the reflective layer 6 is an aluminum plate or a carbon fiber reflective plate.
In an embodiment of the present invention, the first wave absorbing coating comprises the following components in parts by mass: 9-10 parts of carbon black, 110 parts of adhesive 100-.
Preferably, the second wave-absorbing coating comprises the following components in parts by mass: 80-85 parts of carbonyl iron powder, 15-20 parts of adhesive and 20-30 parts of dispersing agent.
Preferably, the design weight of the first wave-absorbing coating in the surface layer honeycomb core is as follows: 280-300g/m2。
The weight of the first wave-absorbing coating in the bottom honeycomb core is as follows: 700-750g/m2The weight of the second wave-absorbing coating is 450-2。
As shown in fig. 3, the preparation method of the light broadband multiband strong absorption double-layer structured honeycomb wave absorption plate provided by the embodiment of the present invention includes the following steps:
s3101: preparing a surface wave-absorbing honeycomb core: and (3) dipping the honeycomb core in the first wave-absorbing coating, weighing after surface drying, and completely curing after repeated dipping reaches the designed weight.
S102: preparing a bottom wave-absorbing honeycomb core: and spraying a second wave-absorbing coating on the surface of the honeycomb core, completely curing after the surface is dried to reach the design weight, then soaking the first wave-absorbing coating, and completely curing after the surface is dried to reach the design weight.
S103: preparing a honeycomb wave-absorbing plate: paving two layers of 0.2mm prepreg, a bottom wave-absorbing honeycomb core, 0.2mm prepreg, a surface wave-absorbing honeycomb core and two layers of 0.2mm prepreg in sequence, then curing and molding under a hot press, and finally, carrying out hot-pressing adhesion on the molded honeycomb wave-absorbing plate and the reflecting plate through an adhesive to obtain the honeycomb wave-absorbing plate.
In the embodiment of the invention, the time for dipping the first wave absorbing coating in step S101 and step S102 is 2-3min each time, and the absorbent in the first wave absorbing coating is carbon black.
In the embodiment of the present invention, in step S102, the absorbent in the second wave-absorbing coating is carbonyl iron powder with high magnetic permeability.
In the embodiment of the present invention, in step S103, an aluminum plate or a carbon fiber reflector is used as the reflector.
The invention is further described with reference to the following figures and examples:
example 1:
the invention provides a light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate which comprises an upper skin, a surface wave absorption honeycomb core, an adhesive layer, a bottom wave absorption honeycomb core, a bottom skin and a reflection layer. The wave absorption plate is structurally characterized by comprising a 0.4mm surface layer skin, a 10.5mm surface layer wave absorption honeycomb core, a 0.2mm middle bonding layer, a 10.5mm bottom layer wave absorption honeycomb core, a 0.4mm bottom layer skin and a 0.4mm carbon fiber plate reflecting layer.
The surface density of the prepared wave-absorbing plate material with the honeycomb structure is 5.5kg/m2The average value is less than or equal to-7 dB in the range of 1GHz-4GHz, less than or equal to-13.8 dB in the range of 4GHz-12GHz, less than or equal to-17.4 dB in the ranges of 12GHz-18GHz and 26.5GHz-40 GHz.
Example 2:
the invention provides a light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate which comprises an upper skin, a surface wave absorption honeycomb core, an adhesive layer, a bottom wave absorption honeycomb core, a bottom skin and a reflection layer. The wave absorption plate is structurally characterized by comprising a 0.4mm surface layer skin, a 11mm surface layer wave absorption honeycomb core, a 0.2mm middle bonding layer, a 11mm bottom layer wave absorption honeycomb core, a 0.4mm bottom layer skin and a 0.4mm carbon fiber plate reflecting layer.
The prepared wave-absorbing plate with honeycomb structureThe areal density of the material was 5.8kg/m2The average value is less than or equal to-7.5 dB in the range of 1GHz-4GHz, less than or equal to-13.3 dB in the range of 4GHz-12GHz, less than or equal to-17.3 dB in the ranges of 12GHz-18GHz and 26.5GHz-40 GHz.
Example 3:
the invention provides a light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate which comprises an upper skin, a surface wave absorption honeycomb core, an adhesive layer, a bottom wave absorption honeycomb core, a bottom skin and a reflection layer. The wave absorption plate is structurally characterized by comprising a 0.4mm surface layer skin, a 11.5mm surface layer wave absorption honeycomb core, a 0.2mm middle bonding layer, a 11.5mm bottom layer wave absorption honeycomb core, a 0.4mm bottom layer skin and a 0.4mm carbon fiber plate reflecting layer.
The surface density of the prepared double-layer structure honeycomb wave-absorbing plate material is 6.0kg/m2The average value is less than or equal to-8 dB in the range of 1GHz-4GHz, less than or equal to-13.5 dB in the range of 4GHz-12GHz, less than or equal to-17.2 dB in the ranges of 12GHz-18GHz and 26.5GHz-40 GHz. The electrical property curve is shown in figure 4, the bandwidth of the honeycomb wave absorption plate is 28.03GHz when the bandwidth is 1GHz-18GHz and 26.5GHz-40GHz less than or equal to-10 dB, and the bandwidth of less than or equal to-15 dB is 23.45 GHz.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A light broadband multi-band strong absorption double-layer structure honeycomb wave absorption plate is characterized in that an upper skin, a surface wave absorption honeycomb core, an adhesive layer, a bottom wave absorption honeycomb core, a bottom skin and a reflecting layer which are adhered to one another are sequentially arranged from top to bottom;
the surface layer wave absorbing honeycomb core is dipped with a first wave absorbing coating, the bottom layer wave absorbing honeycomb core is sprayed with a second wave absorbing coating, and the outer side of the second wave absorbing coating is dipped with the first wave absorbing coating.
2. The lightweight broadband multiband strong-absorption double-layer-structure honeycomb wave-absorbing plate of claim 1, wherein the surface wave-absorbing honeycomb core and the bottom wave-absorbing honeycomb core are made of aramid paper honeycomb, and the honeycomb core is hexagonal.
3. The lightweight broadband multiband strongly absorbing double-layer structured honeycomb wave-absorbing plate of claim 1, wherein the absorber used in the first wave-absorbing coating is carbon black.
4. The lightweight broadband multiband strongly-absorbing double-layer-structured honeycomb wave-absorbing plate of claim 1, wherein the absorbent used in the second wave-absorbing coating is carbonyl iron powder with high magnetic permeability.
5. The lightweight broadband multiband strongly absorbing double-layer structured honeycomb wave-absorbing plate of claim 1, wherein the reflective layer is an aluminum plate or a carbon fiber reflective plate.
6. The lightweight broadband multiband strongly-absorbing double-layer structured honeycomb wave-absorbing plate according to claim 1, wherein the first wave-absorbing coating comprises the following components in parts by mass: 9-10 parts of carbon black, 110 parts of adhesive 100-;
the second wave-absorbing coating comprises the following components in parts by mass: 80-85 parts of carbonyl iron powder, 15-20 parts of adhesive and 20-30 parts of solvent.
7. The lightweight broadband multiband strongly absorbing double-layer structured honeycomb wave-absorbing plate of claim 1, wherein the weight of the first wave-absorbing coating in the surface layer honeycomb core is: 280-300g/m2；
The weight of the first wave-absorbing coating in the bottom honeycomb core is as follows: 700-750g/m2The weight of the second wave-absorbing coating is 450-2。
8. The preparation method of the light broadband multiband strong absorption double-layer structure honeycomb wave absorption plate as claimed in any one of claims 1 to 7, wherein the preparation method of the light broadband multiband strong absorption double-layer structure honeycomb wave absorption plate comprises the following steps:
1) preparing a surface wave-absorbing honeycomb core: dipping the honeycomb core with the first wave-absorbing coating, weighing after surface drying, and completely curing after repeated dipping to reach the designed weight;
2) preparing a bottom wave-absorbing honeycomb core: spraying a second wave-absorbing coating on the surface of the honeycomb core, completely curing after the surface is dried to reach the design weight, then soaking the first wave-absorbing coating, and completely curing after the surface is dried to reach the design weight;
3) preparing a honeycomb wave-absorbing plate: paving two layers of 0.2mm prepreg, a bottom wave-absorbing honeycomb core, 0.2mm prepreg, a surface wave-absorbing honeycomb core and two layers of 0.2mm prepreg in sequence, then curing and molding under a hot press, and finally, carrying out hot-pressing adhesion on the molded honeycomb wave-absorbing plate and the reflecting plate through an adhesive to obtain the honeycomb wave-absorbing plate.
9. The method for preparing a lightweight broadband multiband strong absorption double-layer structure honeycomb wave absorption plate according to claim 8, wherein the time for dipping the first wave absorption coating in step 1) and step 2) is 2-3min, and the absorbent in the first wave absorption coating is carbon black.
10. The method for preparing the light broadband multiband strong absorption double-layer structure honeycomb wave absorption plate according to claim 8, wherein the absorbent in the second wave absorption coating in the step 2) is carbonyl iron powder with high magnetic permeability; the reflecting plate in the step 3) is an aluminum plate or a carbon fiber reflecting plate.
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