CN103171173B - Carbon fiber electromagnetic wave absorbing material and preparation method thereof - Google Patents
Carbon fiber electromagnetic wave absorbing material and preparation method thereof Download PDFInfo
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- CN103171173B CN103171173B CN201310081131.2A CN201310081131A CN103171173B CN 103171173 B CN103171173 B CN 103171173B CN 201310081131 A CN201310081131 A CN 201310081131A CN 103171173 B CN103171173 B CN 103171173B
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Abstract
The invention discloses a carbon fiber electromagnetic wave absorbing material. The material mainly comprises prismoids periodically distributed on a conductive substrate, wherein the prismoids are formed by alternately superposing a carbon fiber layer and a dielectric layer in the direction vertical to the plane of the conductive substrate. A preparation method for the material comprises the following steps of: selecting reinforcing materials for preparing the carbon fiber layer and the dielectric layer, then sequentially spreading the resin adhesive dipped reinforcing materials according to the sequence of alternately superposing the carbon fiber layer and the dielectric layer, and preparing a carbon fiber layer/dielectric layer superposed board by adopting a hot pressing process of resin adhesive standards; and processing the carbon fiber layer/dielectric layer superposed board according to the required shape and size by using a standard numerical control milling method, thereby obtaining the carbon fiber electromagnetic wave absorbing material. The material has the advantages of high applicability, low cost, wide working band, simple processing process and the like.
Description
Technical field
The present invention relates to a kind of absorbing material and preparation method thereof, particularly relate to absorbing material of a kind of carbon fiber-containing and preparation method thereof.
Background technology
The development and application technology of electromagnetic-wave absorbent comes from World War II, is widely used up till now.Nowadays, along with the development of electronic science and technology, the range of application of electromagnetic-wave absorbent is far beyond military field, and the application in Information Communication, electromagnetic compatibility, microwave radiation protecting etc. are civilian is also increasingly extensive.In the electromagnetic wave absorption material of huge number, absorbing carbon fiber wave material is current investigation and application one of absorbing material the most widely.But current absorbing carbon fiber wave material adopts traditional Dallenbach structure to use usually, and inhale ripple limited bandwidth, and current research is mainly based on laboratory facilities, the lead time is long.Therefore, the major issue that suction wavestrip Electromagnetic Design that is wide and solution absorbing carbon fiber wave material is current electromagnetic absorbing material field is expanded.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, there is provided the carbon fiber electromagnetic-wave absorbent that a kind of applicability is strong, cost is low, working band is wide, also the corresponding preparation method that the carbon fiber electromagnetic-wave absorbent that a kind of process route is simple, raw material is easy to get, preparation cost is low is provided.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of carbon fiber electromagnetic-wave absorbent, described carbon fiber electromagnetic-wave absorbent forms primarily of the terrace with edge of periodic distribution on good conductive substrate, and described terrace with edge replaces superposition by carbon fiber layer and dielectric layer in the direction perpendicular to electrically-conductive backing plate plane to form.
Above-mentioned carbon fiber electromagnetic-wave absorbent, described good conductive substrate is preferably continuous carbon fibre composite material plate or metallic plate.
Above-mentioned carbon fiber electromagnetic-wave absorbent, described periodic distribution preferably refers to and to distribute in matrix arrangement.
Above-mentioned carbon fiber electromagnetic-wave absorbent, described terrace with edge is preferably positive truncated rectangular pyramids, the bottom surface length of side (b) of this positive truncated rectangular pyramids is preferably 7mm ~ 15mm, the upper bottom surface length of side (a) of this positive truncated rectangular pyramids is preferably 3.5mm ~ 6.0mm, and the spacing (d) of adjacent two positive truncated rectangular pyramids is preferably 0.2mm ~ 2.5mm.
Above-mentioned carbon fiber electromagnetic-wave absorbent, described carbon fiber layer is preferably made up of carbon fiber enhancement resin base composite material, particularly preferred, and every one deck carbon fiber enhancement resin base composite material preferably comprises the carbon fiber reinforcement of two layers of unidirectional omnidirectional distribution.
Above-mentioned carbon fiber electromagnetic-wave absorbent, described dielectric layer is preferably made up of galss fiber reinforced resin based composites, and the dielectric constant of described dielectric layer is preferably 2 ~ 5, and dielectric loss angle is preferably 0.01 ~ 0.04.
Above-mentioned carbon fiber electromagnetic-wave absorbent, the thickness (m) of described carbon fiber layer is preferably 0.05mm ~ 0.1mm, and the thickness (n) of described dielectric layer is preferably 0.15mm ~ 0.3mm.
Above-mentioned carbon fiber electromagnetic-wave absorbent, the carbon fiber layer comprised in single described terrace with edge, the number of plies of dielectric layer are all preferably 5 ~ 15 layers.
As a total technical conceive, the present invention also provides a kind of preparation method of above-mentioned carbon fiber electromagnetic-wave absorbent, comprises the following steps:
(1) carbon fiber layer/medium laminated laminate is prepared: first choose the reinforcing material making carbon fiber layer and dielectric layer, reinforcing material after resin pickup glue is carried out order laying by the ply stacking-sequence then alternately superposed according to carbon fiber layer, dielectric layer, finally adopts the heat pressing process of resin adhesive liquid standard to prepare carbon fiber layer/medium laminated laminate;
(2) shaping: carbon fiber layer/medium laminated laminate that step (1) is obtained utilizes the numerical control mill method of standard to be processed into the shape and size of requirement, obtains carbon fiber electromagnetic-wave absorbent.
Compared with prior art, the invention has the advantages that:
1. carbon fiber electromagnetic-wave absorbent raw material of the present invention is easy to get, and preparation were established is simple, and preparation cost is lower;
2. the working band of carbon fiber electromagnetic-wave absorbent of the present invention is wide;
3. carbon fiber electromagnetic-wave absorbent of the present invention, applied widely, and by the size of Reasonable adjustment terrace with edge, carbon fiber electromagnetic-wave absorbent of the present invention is applicable to the various application scenarios that difference puts into practice electromagnetic-wave absorbent under occasion.
Accompanying drawing explanation
Fig. 1 is the structural representation (local is overlooked) of carbon fiber electromagnetic-wave absorbent in the embodiment of the present invention.
Fig. 2 is the structural representation (local is main to be looked) of carbon fiber electromagnetic-wave absorbent in the embodiment of the present invention.
Fig. 3 is the enlarged drawing of the positive truncated rectangular pyramids in the embodiment of the present invention on carbon fiber electromagnetic-wave absorbent.
Fig. 4 is the photo in kind of carbon fiber electromagnetic-wave absorbent in the embodiment of the present invention 1.
Fig. 5 is the reflectance curve figure of carbon fiber electromagnetic-wave absorbent in the embodiment of the present invention 1.
Marginal data:
1, positive truncated rectangular pyramids; 2, carbon fiber layer; 3, dielectric layer; 4, electrically-conductive backing plate.
Detailed description of the invention
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
embodiment 1:
A kind of carbon fiber electromagnetic-wave absorbent of the present invention as shown in Fig. 1 ~ Fig. 5, this carbon fiber electromagnetic-wave absorbent selects metal aluminum substrate primarily of at electrically-conductive backing plate 4(the present embodiment) the positive truncated rectangular pyramids 1 of upper periodic distribution forms, this positive truncated rectangular pyramids be by carbon fiber layer 2 and dielectric layer 3 on the direction perpendicular to electrically-conductive backing plate 4 plane alternately superposition form.In the present embodiment, positive truncated rectangular pyramids 1 is truncated rectangular pyramids 1 distribution in matrix arrangement of making a comment or criticism in periodic distribution.The bottom surface side length b of this positive truncated rectangular pyramids 1 is 8.4mm, and the upper bottom surface length of side a of this positive truncated rectangular pyramids is 4.5mm, and the spacing d of adjacent two positive truncated rectangular pyramids is 2.0mm.Carbon fiber layer 2 in the present embodiment is made up of carbon fiber reinforced epoxy resin-based composite, and the resin composite materials particularly strengthened by two layers of unidirectional carbon fiber omnidirectional distribution is formed, and the electrical conductivity of carbon fiber is about 5.0 × 10
4s/m.Dielectric layer 3 is glass fiber reinforced epoxy resin composite, and its relative dielectric constant is about 4.4, and dielectric loss angle is 0.02.The thickness m of carbon fiber layer 2 is 0.06mm, and the number of plies is 8 layers; The thickness n of dielectric layer 3 is 0.28mm, and the number of plies is 8 layers.
The preparation method of the carbon fiber electromagnetic-wave absorbent of above-mentioned the present embodiment, comprises the following steps:
(1) carbon fiber layer/medium laminated laminate is prepared: choosing carbon fiber one-way prepreg, glass fabric and epoxide-resin glue is raw material, after glass fabric impregnated with resin glue, successively according to the order laying of carbon fiber one-way prepreg, glass fabric alternative stacked on aluminium base, the heat pressing process of epoxy resin standard is finally utilized to prepare carbon fiber layer/medium laminated laminate;
(2) shaping: to utilize the machining process of standard (numerical control mill) on carbon fiber layer/medium laminated laminate that step (1) is obtained, process shape (positive truncated rectangular pyramids) required by the present embodiment and size, obtain carbon fiber electromagnetic-wave absorbent.
The carbon fiber electromagnetic-wave absorbent of the present embodiment obtained by said method, as shown in Figure 5, as seen from Figure 5, within the scope of 6GHz ~ 18GHz, decay is greater than the bandwidth of 10dB is 5.8GHz to reflectance curve figure after testing, visible, electromagnetic-wave absorbent of the present invention has wider suction wavestrip wide.
embodiment 2:
A kind of carbon fiber electromagnetic-wave absorbent of the present invention as shown in FIG. 1 to 3, this carbon fiber electromagnetic-wave absorbent forms primarily of the positive truncated rectangular pyramids 1 of periodic distribution on electrically-conductive backing plate 4, and this positive truncated rectangular pyramids on the direction perpendicular to electrically-conductive backing plate 4 plane, replaces superposition by carbon fiber layer 2 and dielectric layer 3 to form.In the present embodiment, positive truncated rectangular pyramids 1 is truncated rectangular pyramids 1 distribution in matrix arrangement of making a comment or criticism in periodic distribution.The bottom surface side length b of this positive truncated rectangular pyramids 1 is 7.0mm, and the upper bottom surface length of side a of this positive truncated rectangular pyramids is 3.8mm, and the spacing d of adjacent two positive truncated rectangular pyramids is 1.5mm.Carbon fiber layer 2 in the present embodiment is made up of carbon fiber reinforced epoxy resin-based composite, and the electrical conductivity of carbon fiber is about 5.0 × 10
4s/m.Dielectric layer 3 is glass fiber reinforced epoxy resin composite, and its relative dielectric constant is about 4.4, and dielectric loss angle is 0.02.The thickness m of carbon fiber layer 2 is 0.06mm, and the number of plies is 6 layers; The thickness n of dielectric layer 3 is 0.28mm, and the number of plies is 6 layers.
The key step of the preparation method of the carbon fiber electromagnetic-wave absorbent of the present embodiment is similar to Example 1, only needs to make accommodation according to the design of product and dimensional requirement to corresponding technological parameter and process conditions.
The carbon fiber electromagnetic-wave absorbent of the present embodiment obtained by said method, after testing, its bandwidth being greater than 10dB that decays within the scope of 6GHz ~ 18GHz is 6.4GHz, has wider suction wavestrip wide.
embodiment 3:
A kind of carbon fiber electromagnetic-wave absorbent of the present invention as shown in FIG. 1 to 3, this carbon fiber electromagnetic-wave absorbent forms primarily of the positive truncated rectangular pyramids 1 of periodic distribution on electrically-conductive backing plate 4, and this positive truncated rectangular pyramids replaces superposition by carbon fiber layer 2 and dielectric layer 3 in the direction perpendicular to electrically-conductive backing plate 4 plane to form.In the present embodiment, positive truncated rectangular pyramids 1 is truncated rectangular pyramids 1 distribution in matrix arrangement of making a comment or criticism in periodic distribution.The bottom surface side length b of this positive truncated rectangular pyramids 1 is 10.0mm, and the upper bottom surface length of side a of this positive truncated rectangular pyramids is 4.8mm, and the spacing d of adjacent two positive truncated rectangular pyramids is 2.0mm.Carbon fiber layer 2 in the present embodiment is made up of carbon fiber reinforced epoxy resin-based composite, and the electrical conductivity of carbon fiber is about 5.0 × 10
4s/m.Dielectric layer 3 is glass fiber reinforced epoxy resin composite, and its relative dielectric constant is about 4.4, and dielectric loss angle is 0.02.The thickness m of carbon fiber layer 2 is 0.06mm, and the number of plies is 12 layers; The thickness n of dielectric layer 3 is 0.28mm, and the number of plies is 12 layers.
The key step of the preparation method of the carbon fiber electromagnetic-wave absorbent of the present embodiment is similar to Example 1, only needs to make accommodation according to the design of product and dimensional requirement to corresponding technological parameter and process conditions.
The carbon fiber electromagnetic-wave absorbent of the present embodiment obtained by said method, after testing, its bandwidth being greater than 10dB that decays within the scope of 6GHz ~ 18GHz is 5.9GHz, has wider suction wavestrip wide.
Claims (7)
1. a carbon fiber electromagnetic-wave absorbent, it is characterized in that, described carbon fiber electromagnetic-wave absorbent forms primarily of the terrace with edge of periodic distribution on electrically-conductive backing plate, and described terrace with edge replaces superposition by carbon fiber layer and dielectric layer in the direction perpendicular to electrically-conductive backing plate plane to form;
Described periodic distribution refers to and to distribute in matrix arrangement;
Described carbon fiber layer is made up of carbon fiber enhancement resin base composite material, and every one deck carbon fiber enhancement resin base composite material comprises the carbon fiber reinforcement of two-layer omnidirectional distribution.
2. carbon fiber electromagnetic-wave absorbent according to claim 1, is characterized in that, described electrically-conductive backing plate is continuous carbon fibre composite material plate or metallic plate.
3. carbon fiber electromagnetic-wave absorbent according to claim 1, it is characterized in that, described terrace with edge is positive truncated rectangular pyramids, and the bottom surface length of side of this positive truncated rectangular pyramids is 7mm ~ 15mm, the upper bottom surface length of side of this positive truncated rectangular pyramids is 3.5mm ~ 6.0mm, and the spacing of adjacent two positive truncated rectangular pyramids is 0.2mm ~ 2.5mm.
4. the carbon fiber electromagnetic-wave absorbent according to any one of claims 1 to 3, it is characterized in that, described dielectric layer is made up of galss fiber reinforced resin based composites, and the dielectric constant of described dielectric layer is 2 ~ 5, and dielectric loss angle tangent is 0.01 ~ 0.04.
5. the carbon fiber electromagnetic-wave absorbent according to any one of claims 1 to 3, is characterized in that, the thickness of described carbon fiber layer is 0.05mm ~ 0.1mm, and the thickness of described dielectric layer is 0.15mm ~ 0.3mm.
6. carbon fiber electromagnetic-wave absorbent according to claim 5, is characterized in that, the carbon fiber layer comprised in single described terrace with edge, the number of plies of dielectric layer are 5 ~ 15 layers.
7. a preparation method for the carbon fiber electromagnetic-wave absorbent according to any one of claim 1 ~ 6, comprises the following steps:
(1) carbon fiber layer/medium laminated laminate is prepared: first choose the reinforcing material making carbon fiber layer and dielectric layer, reinforcing material after resin pickup glue is carried out order laying by the ply stacking-sequence then alternately superposed according to carbon fiber layer, dielectric layer, finally adopts resin adhesive liquid heat pressing process to prepare carbon fiber layer/medium laminated laminate;
(2) shaping: carbon fiber layer/medium laminated laminate that step (1) is obtained utilizes numerical control mill method to be processed into the shape and size of requirement, obtains carbon fiber electromagnetic-wave absorbent.
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| CN103171173B true CN103171173B (en) | 2015-05-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104763100B (en) * | 2015-03-06 | 2016-09-14 | 中国人民解放军国防科学技术大学 | Big plate of shelter with radar invisible and bulletproof function and preparation method thereof |
| CN105356067A (en) * | 2015-11-26 | 2016-02-24 | 深圳唯创微波技术有限公司 | Wave-absorbing structure |
| CN106324754B (en) * | 2016-11-14 | 2019-07-16 | 四川大学 | Optical device and unidirectional guided wave structure |
| CN112280077A (en) * | 2020-11-11 | 2021-01-29 | 得一传动科技(辽宁)有限公司 | Prepreg with electromagnetic shielding function and preparation method thereof |
| CN112702900B (en) * | 2020-11-24 | 2022-07-15 | 南京航空航天大学 | Metamaterial wave absorber |
Citations (2)
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| US4479994A (en) * | 1983-05-18 | 1984-10-30 | The United States Of America As Represented By The Secretary Of The Army | Wide band energy absorbing camouflage blanket |
| CN102229267A (en) * | 2011-04-07 | 2011-11-02 | 中国人民解放军国防科学技术大学 | Hybrid fiber reinforced resin matrix sandwich structural absorbing material and its preparation method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479994A (en) * | 1983-05-18 | 1984-10-30 | The United States Of America As Represented By The Secretary Of The Army | Wide band energy absorbing camouflage blanket |
| CN102229267A (en) * | 2011-04-07 | 2011-11-02 | 中国人民解放军国防科学技术大学 | Hybrid fiber reinforced resin matrix sandwich structural absorbing material and its preparation method |
Non-Patent Citations (1)
| Title |
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| 微量碳纤维/ 树脂复合吸波材料的研究;邹田春等;《功能材料》;20051130(第11期);第1691页第2栏第9行至第1692页第2栏第3行，附图2、7 * |
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