CN101232799B - Multiband electromagnetic wave absorb composite material and preparing method thereof - Google Patents
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Abstract
A composite material for absorbing multiwave electromagnetic wave and a preparation method thereof are provided, the method comprises the following steps that an expanding treatment is carried out to graphite, and millimicron metal particles are sedimentated on the inner and outer surfaces of highly-expanded graphite particles; the highly-expanded graphite particles are made by catalyzing, oxidating and expanding natural scale graphite, and a conventional sedimentation method is adopted to sedimentating the millimicron metal particles on the inner and outer surfaces of the highly-expanded graphite particles. With excellent electromagnetic reduction performance, the composite material obtained can be widely applied to such units as communication, electronic systems, radar wave transmitting and receiving devices, and used in electronic devices for preventing electromagnetic radioactive interference, information leakage, electromagnetic pollution etc. The invention can also be widely used for military purposes, such as radar wave detecting protection, armored fighting vehicles, the inner and surface protection for mobile commanding systems, surface ships, airplanes etc, various military camouflages, tents, and particularly the military smoke camouflage.
Description
Technical field
The present invention relates to a kind of multiband electromagnetic wave absorb composite material and preparation method thereof, described composite material is to have laser/infrared/highly bulked graphite composite material microwave multiband electromagnetic wave absorbent properties, that deposited metal particle.
Technical background
Human research to absorbing material starts from military at first, many civil areas such as now except military affairs are stealthy, along with developing rapidly of telecommunications industry, the application of absorbing material also is widely used in that communication is anti-interference, environmental protection and physical protection.
Existing absorbing material has a variety of, as ferrite system, macromolecular, carborundum system, conductive fiber, cenosphere, cluster material, rare earth material etc., the research of novel wave-absorbing material should develop towards thin, light, wide, strong direction, so magnetic nanometer particles, nano-particular film and multilayer film will become practical absorbent of new generation.
Graphite with layer structure is the modification electromagnetic shielding material of quite being favored, the crystalline flake graphite interlamellar spacing is 3.40A, and through the expanded graphite after chemistry and the electrochemical method processing, interlamellar spacing can reach more than the 6A, can insert other altered contents, improve the electromagnetic attenuation performance of graphite.The composite material of having reported at present relevant with graphite that is used for electromagnetic shielding has three classes: a class is directly with graphite and metal or metal oxide or slaine particulate physical mixed or graphite powder direct chemical metal lining; Second class then is graphite intercalation compound (GIC), as Br-GIC, CoCl2-FeCl3-GIC, FeCl3-NiCl2--GIC, CuCl2-FeCl3-GIC etc., this class material is by with intercalation thing and natural flake graphite, adopts quantitative mixing method or molten salt growth method and obtains; The 3rd class then is a graphite oxide, be about to some and contain the oxygen functional group, as-OH ,-insert layers such as COOH, epoxy radicals between, improve the hydrophilic and absorption property of graphite, synthesize polymer/graphite oxidation nanometer material.Above-mentioned material, graphite layers distance do not have expansion or enlarge distance limited, and the interfloor distance maximum only reaches about 2nm, insert particle and are subjected to bigger restriction in the distribution of interlayer, make the electromagnetic attenuation performance be subjected to influence, and the density reduction are less, and proportion is bigger.
Summary of the invention
The technical problem to be solved in the present invention is, deficiency at the prior art existence, a kind of multiband electromagnetic wave absorb composite material and preparation method thereof is proposed, the preparation method comprise produce highly bulked graphite particle and graphite particle the layer surfaces externally and internally on the depositing nano metal particle, prepared composite material interlamellar spacing is from expanding to about 1 μ m, density reduces big, have many thin layers and wrinkled surface, be convenient to the deposition of particle, the particle particle size of deposition is little, make full use of the interlayer of graphite and the quantum size effect of nano material, had excellent electromagnetic attenuation performance.
One of technical scheme of the present invention is, the consisting of of described multiband electromagnetic wave absorb composite material: with highly bulked graphite particle is matrix, and the nano metal particulate of deposition is arranged on the layer surfaces externally and internally of described graphite particle; Described graphite particle grain diameter (diameter) is 10 μ m～1cm, and particle has many laminate structures, and aspect is concavo-convex fold circle platform shape, and interlamellar spacing is 0.2 μ m～1 μ m; The particle diameter of described nano metal particulate (diameter) is 10nm～5 μ m, and the content of nano metal particulate is the 5wt%-90wt% of composite material; Described nano metal particulate be in the elements such as nickel or iron, cobalt, copper, manganese, silver, yttrium, lanthanum, titanium, strontium any one or more than one.
Two of technical scheme of the present invention is, the preparation method of described multiband electromagnetic wave absorb composite material is: with natural flake graphite through chemical catalytic oxidation, expandedly make highly bulked graphite particle, described graphite particle grain diameter (diameter) is 10 μ m～1cm, and particle has many laminate structures, aspect is concavo-convex fold circle platform shape, and interlamellar spacing is 0.2 μ m～1 μ m; Utilize conventional deposition process depositing nano metal particle and make described composite material on the layer surfaces externally and internally of described expanded graphite particle again; The particle diameter of described nano metal particulate (diameter) is 10nm～5 μ m, and the content of nano metal particulate is the 5wt%-90wt% of composite material.
Below the present invention made further specify.
In the preparation method of the present invention, can adopt following step that natural flake graphite is carried out described chemical catalytic oxidation:
A. get 5 parts of-10 parts of natural flake graphites by weight, add 0.5 part of-2 parts of composite catalyst, milled after the mixing 8 minutes-12 minutes, get mixed powder; Described composite catalyst is that ferric nitrate and equivalent mix in the ruthenic chloride of ferric nitrate;
B. mixed powder is joined weight portion and be 50 parts-150 parts, concentration and be in 98% the concentrated sulfuric acid, stirring reaction is 0.8 hour-1.2 hours under 40 ℃ of-50 ℃ of temperature, reactant;
C. add weight portion in the described reactant and be 5 parts-10 parts potassium permanganate, stirring reaction 2.8 hours-3.2 hours under 40 ℃ of-50 ℃ of temperature then, the secondary response thing; Described potassium permanganate under agitation divides 5-10 adding;
D. filter the secondary response thing, clean to filtrate and be neutral, oxidation product.
In the preparation method of the present invention, carry out described expanded method and can be: described oxidation product is under 150 ℃ of-200 ℃ of temperature, expanded rapidly in inert gas, the expanded graphite particle.
Described inert gas can be nitrogen and argon gas.
In the preparation method of the present invention, described conventional deposition process is physical deposition or chemical deposition, electrochemical deposition method.
In the preparation method of the present invention, can adopt chemical deposition depositing nano metal particle on the layer surfaces externally and internally of expanded graphite particle of following step:
A. with described expanded graphite particle at PH=1,10g/L SnCl
2The aqueous solution in sonicated sensitization in-16 minutes in 14 minutes, suction filtration is washed to the PH=7 of washing lotion, then:
B. at PH=1,0.5g/L PdCl
2The aqueous solution in sonicated 14 minutes-16 minutes activation, suction filtration is washed to the PH=7 of filtrate, the expanded graphite particle that must activate;
C. with the expanded graphite particle of described activation 15g/L NiSO at 70 ℃-80 ℃
46H
2O and 15g/L CuSO
46H
2After soaking 1.8 hours-2.2 hours in the O aqueous solution, filter, get filtrate;
D. described filtrate is joined in the plating bath, stirs and in 75 ℃ of-85 ℃ of platings 1 hour-3 hours, again with product after filtration, clean, oven dry, promptly;
Described electroplate liquid formulation is as follows:
NiSO
4·6H
2O 5g/L-25g/L，
NaH
2PO
4·H
2O 30g/L-50g/L，
NaC
2H
3O
2·3H
2O 14g/L-16g/L，
C
7H
7O
7·H
2O 28g/L-32g/L，
CuSO
4·6H
2O 5g/L-25g/L。
Composite material and preparation method thereof of the present invention comprises the expanding treatment of graphite and depositing nano metal particle on the layer surfaces externally and internally of highly bulked graphite particle.Highly bulked graphite particle is by natural flake graphite process chemical catalytic oxidation, expanded making.
The distribution of sizes of gained composite material granular of the present invention can be 10 μ m-1cm, as shown in Figure 1; Described composite material granular has many laminate structures, and interlamellar spacing is 0.2 μ m-1 μ m, as shown in Figure 2; Described composite material granular aspect is concavo-convex fold circle platform shape, is convenient to the deposition of nano particle, and as shown in Figure 3 and Figure 4, white particle is a metal particle among the figure; The diameter of the metal particle in the described composite material granular is 10nm-5 μ m, as shown in Figure 5; The content of the metal particle in the described composite material is 5wt%-90wt%.
The composite material that the inventive method makes can absorb the electromagnetic wave of laser, infrared and a plurality of wave bands of microwave, can be applicable to smoke screen, coating and other structural types are stealthy and the electromagnetic shielding field, and correlated performance is seen shown in Fig. 5-8.
As known from the above, the present invention is a kind of preparation method of multiband electromagnetic wave absorb composite material, prepared product has excellent electromagnetic attenuation performance, can be widely used in communication, electronic system, the anti-electromagnetic radiation that radar wave transmits and receives applying unit such as device and e-machine inside disturbs and information leakage, and the electromagnetic pollution protection etc., also can be widely used in military affairs, protect as radar wave detection, armored combat vehicle, mobile commanding system, surface ship, the inside of aircraft etc. and surfacecti proteon, various camouflages, tent, it is stealthy especially to can be used for military smoke screen.
Description of drawings
Fig. 1 is the composite material granular diagram that the present invention makes.As can be seen from Figure 1, composite material granular is not of uniform size, can distribute between 0.5 μ m-1cm; Grain structure is evacuated, and is beneficial to the reduction of density of material; The particle that structure is evacuated is convenient to electromagnetic repeatedly scattering and absorption.
Fig. 2 is a composite material granular body phase cross section shape appearance figure.As seen composite material granular presents sandwich construction, and the space is obvious between layer and the layer, and distance is not of uniform size, can be between the 0.2 μ m-1 μ m; The expansion of interfloor distance helps the insertion of metal and compound particulate thereof, improves electromagnetic performance.
Fig. 3 is a composite wave-suction material particle microscopic scale aspect shape appearance figure.As seen composite wave-suction material particle microscopic scale aspect pattern has inhomogeneities, can be observed structures such as table top, step, defective; The inhomogeneities on surface is beneficial to the deposition of metallic element and compound thereof, is the metal particle of deposition as white particle among the figure.
Fig. 4 is that the metal and the compound thing thereof of composite wave-suction material particle level aspect deposition distributes.From figure as can be known, be deposited on the metallic particles of aspect, not of uniform size, diameter is 10nm-5 μ m; Deposition and granular size, distribution situation are relevant with length, the concentration height of deposition reactant, the depositing operation of sedimentation time.
Fig. 5 is that concentration is 0.715g/m
3The composite material smoke screen be 1.06 μ m laser unidirectional electrical magnetic wave attenuating figure in 6.1 meters smoke boxes at light path, abscissa among the figure is the employing time, ordinate is a laser transmittance, and as can be seen from Figure, composite material is almost 100% to the electromagnetic attenuation effect of 1.06 μ m laser.This composite material is 2.2m at 1.06 μ m laser extinction coefficients
2/ g.
Fig. 6 is the 4000cm that 0.0009 gram composite material and KBr compressing tablet record
-1-500cm
-1The INFRARED ABSORPTION design sketch.At 20m
3The average infrared extinction coefficient that records the composite material smoke screen in the smoke box is 1.6m
2/ g.This is much larger than the extinction coefficient (m of the listed infrared extinction material of relevant carbon of following table
2/ g).
| Acetylene black | 0.46 |
| Carbon black | 0.62 |
| Graphite | 0.67 |
| FeCl3.2GIC | 0.93 |
| Acetylene black | 0.46 |
| CuCl2.2GIC | 1.02m |
| Bromo-GIC | 1.18 |
| The special smoke screen material of the U.S. | 1.20 |
| This patent composite material | 1.60 |
Fig. 7 is that bulk density is 0.004 gram/cm
3The one-way attenuation effect of the electromagnetic wave band of X, the S of composite material in 12.0cm * 43.2cm * 32.8cm case, L-band; Wherein (a) is X-band loss measurement result, (b) is S-band loss measurement result, (c) is L-band loss measurement result.
Fig. 8 is the electromagnetic transmission attenuation test macro of X, S, the L-band schematic diagram of Fig. 7.The electromagnetic consumable of absorbing material is P1-P2.P1 is 0.004 gram/cm for having filled bulk density
3The level of composite material (dB), P2 are the level (dB) of not filled composite materials.
Embodiment
Embodiment 1: a kind of preparation method of multiband electromagnetic wave absorb composite material is:
(1) produce highly bulked graphite particle:
A. get 7 parts of natural flake graphites by weight, add 1.2 parts of composite catalysts, milled after the mixing 10 minutes, get mixed powder; Described composite catalyst is that ferric nitrate and equivalent mix in the ruthenic chloride of ferric nitrate;
B. mixed powder is joined weight portion and be 100 parts, concentration and be in 98% the concentrated sulfuric acid, stirring reaction is 1 hour under 45 ℃ of temperature, reactant;
C. add weight portion in the described reactant and be 8 parts potassium permanganate, stirring reaction 3 hours under 45 ℃ of temperature then, the secondary response thing; Described potassium permanganate under agitation divides 7 addings;
D. filter the secondary response thing, clean to filtrate and be neutral, oxidation product;
E. with the gained oxidation product under 175 ℃ of temperature, expanded rapidly in nitrogen, the expanded graphite particle;
(2) depositing nano metal particle on the layer surfaces externally and internally of expanded graphite particle:
A. with described expanded graphite particle at PH=1,10g/L SnCl
2The aqueous solution in sonicated sensitization in 15 minutes, suction filtration is washed to the PH=7 of washing lotion, then:
B. at PH=1,0.5g/L PdCl
2The aqueous solution in sonicated 15 minutes activation, suction filtration is washed to the PH=7 of filtrate, the expanded graphite particle that must activate;
C. with the expanded graphite particle of described activation 15g/L NiSO at 75 ℃
46H
2O and 15g/LCuSO
46H
2After soaking 2 hours in the O aqueous solution, filter, get filtrate;
D. described filtrate is joined in the plating bath, stirs and in 80 ℃ of platings 2 hours, again with product after filtration, clean, oven dry, promptly;
Described electroplate liquid formulation is as follows:
NiSO
4·6H
2O 15g/L，
NaH
2PO
4·H
2O 40g/L，
NaC
2H
3O
2·3H
2O 15g/L，
C
7H
7O
7·H
2O 30g/L，
CuSO
4·6H
2O 15g/L。
Embodiment 2: a kind of preparation method of multiband electromagnetic wave absorb composite material comprises:
(1) produce highly bulked graphite particle:
A. get 10 parts of natural flake graphites by weight, add 2 parts of composite catalysts, milled after the mixing 12 minutes, get mixed powder; Described composite catalyst is that ferric nitrate and equivalent mix in the ruthenic chloride of ferric nitrate;
B. mixed powder is joined weight portion and be 150 parts, concentration and be in 98% the concentrated sulfuric acid, stirring reaction is 1.2 hours under 50 ℃ of temperature, reactant;
C. add weight portion in the described reactant and be 10 parts potassium permanganate, stirring reaction 3.2 hours under 50 ℃ of temperature then, the secondary response thing; Described potassium permanganate under agitation divides 10 addings;
D. filter the secondary response thing, clean to filtrate and be neutral, oxidation product;
E. with the gained oxidation product under 200 ℃ of temperature, expanded rapidly in nitrogen, the expanded graphite particle;
(2) depositing nano metal particle on the layer surfaces externally and internally of expanded graphite particle:
A. with described expanded graphite particle at PH=1,10g/L SnCl
2The aqueous solution in sonicated sensitization in 16 minutes, suction filtration is washed to the PH=7 of washing lotion, then:
B. at PH=1,0.5g/L PdCl
2The aqueous solution in sonicated 16 minutes activation, suction filtration is washed to the PH=7 of filtrate, the expanded graphite particle that must activate;
C. with the expanded graphite particle of described activation 15g/L NiSO at 80 ℃
46H
2O and 15g/LCuSO
46H
2After soaking 2.2 hours in the O aqueous solution, filter, get filtrate;
D. described filtrate is joined in the plating bath, stirs and in 85 ℃ of platings 3 hours, again with product after filtration, clean, oven dry, promptly;
Described electroplate liquid formulation is as follows:
NiSO
4·6H
2O 25g/L，
NaH
2PO
4·H
2O 50g/L，
NaC
2H
3O
2·3H
2O 16g/L，
C
7H
7O
7·H
2O 32g/L，
CuSO
4·6H
2O 25g/L。
Embodiment 3: a kind of preparation method of multiband electromagnetic wave absorb composite material comprises:
(1) produce highly bulked graphite particle:
A. get 5 parts of natural flake graphites by weight, add 0.5 part of composite catalyst, milled after the mixing 8 minutes, get mixed powder; Described composite catalyst is that ferric nitrate and equivalent mix in the ruthenic chloride of ferric nitrate;
B. mixed powder is joined weight portion and be 50 parts, concentration and be in 98% the concentrated sulfuric acid, stirring reaction is 0.8 hour under 40 ℃ of temperature, reactant;
C. add weight portion in the described reactant and be 5 parts potassium permanganate, stirring reaction 2.8 hours under 40 ℃ of temperature then, the secondary response thing; Described potassium permanganate under agitation divides 5 addings;
D. filter the secondary response thing, clean to filtrate and be neutral, oxidation product;
E. with the gained oxidation product under 150 ℃ of temperature, expanded rapidly in nitrogen, the expanded graphite particle;
(2) depositing nano metal particle on the layer surfaces externally and internally of expanded graphite particle:
A. with described expanded graphite particle at PH=1,10g/L SnCl
2The aqueous solution in sonicated sensitization in 14 minutes, suction filtration is washed to the PH=7 of washing lotion, then:
B. at PH=1,0.5g/L PdCl
2The aqueous solution in sonicated 14 minutes activation, suction filtration is washed to the PH=7 of filtrate, the expanded graphite particle that must activate;
C. with the expanded graphite particle of described activation 15g/L NiSO at 70 ℃
46H
2O and 15g/LCuSO
46H
2After soaking 1.8 hours hours in the O aqueous solution, filter, get filtrate;
D. described filtrate is joined in the plating bath, stirs and in 75 ℃ of platings 1 hour, again with product after filtration, clean, oven dry, promptly;
Described electroplate liquid formulation is as follows:
NiSO
4·6H
2O 5g/L，
NaH
2PO
4·H
2O 30g/L，
NaC
2H
3O
2·3H
2O 14g/L，
C
7H
7O
7·H
2O 28g/L，
CuSO
4·6H
2O 5g/L。
Embodiment 4: take by weighing 5～10 gram natural flake graphites, add 0.5～2 gram 1: 1 ferric nitrate and ruthenic chloride composite catalyst, milled after the mixing 10 minutes, mixed powder after milling is joined in the concentrated sulfuric acid of 50～150ml98%, stirring reaction below 50 ℃ adds 2～5 gram potassium hyperchlorate or potassium permanganate after 1 hour, potassium hyperchlorate or potassium permanganate under agitation divide 5～10 addings.Above-mentioned reactant stir, reaction below 50 ℃ filters after 3 hours, clean to filtrate to be neutral, then products therefrom in nitrogen 150 ℃～200 ℃ rapid expanded.
Above-mentioned expanded graphite is carried out the hydro-thermal impregnation process, dipping solution is 10～30g/l nickelous sulfate and 10～50g/l urea liquid, 100～200ml, the pH value is neutral, 98 ℃ of constant temperature, at the uniform velocity stir, use cold water quenching cessation reaction behind the dipping 6h, the product centrifugation, water and acetone clean, and are drying to obtain nickel oxide deposition composite wave-suction material then in the time of 75 ℃.
Embodiment 5: take by weighing 5～10 gram natural flake graphites, add 1: 1 ferric nitrate of 0.5～2 gram and ruthenic chloride composite catalyst (or adding 2-5 gram sodium nitrate again), milled after the mixing 10 minutes, mixed powder after milling is joined in the concentrated sulfuric acid of 50～150ml98%, stirring reaction below 50 ℃ adds 2～5 grammes per square metre potassium chromate or potassium permanganate after 1 hour, potassium bichromate or potassium permanganate need under agitation divide 5～10 addings.Above-mentioned reactant stir, reaction below 50 ℃ filters after 3 hours, clean to filtrate to be neutral, then products therefrom in nitrogen 150 ℃～200 ℃ rapid expanded.
Above-mentioned expanded graphite be impregnated in Ni (NO3) 2 solution that 50～200ml contains 5～30g/l of 0.2wt% polyethylene glycol 30 minutes, 30wt%KOH solution is slowly added, limit heating edge high-speed stirred, until the pH of solution value is 11, constant temperature 2h in 70 ℃ of water-baths, room temperature leaves standstill 12h, filters, wash to the pH value be 7, dry nickel oxide deposition composite wave-suction material.
Claims (3)
1. a multiband electromagnetic wave absorb composite material is characterized in that, it consist of: with expanded graphite particle is matrix, and the nano metal particulate of deposition is arranged on the layer surfaces externally and internally of described graphite particle; Described graphite particle grain diameter is 10 μ m～1cm, and particle has many laminate structures, and aspect is concavo-convex fold circle platform shape, and interlamellar spacing is 0.2 μ m～1 μ m; The particle diameter of described nano metal particulate is 10nm～5 μ m, and the content of nano metal particulate is the 5wt%-90wt% of composite material.
2. according to the described multiband electromagnetic wave absorb composite material of claim 1, it is characterized in that, described nano metal particulate be in nickel or iron, cobalt, copper, manganese, silver, yttrium, lanthanum, titanium, the strontium element any one or more than one.
3. the preparation method of a multiband electromagnetic wave absorb composite material, it is characterized in that, this method is: with natural flake graphite through chemical catalytic oxidation, expandedly make expanded graphite particle, described graphite particle grain diameter is 10 μ m～1cm, and particle has many laminate structures, aspect is concavo-convex fold circle platform shape, and interlamellar spacing is 0.2 μ m～1 μ m; Utilize conventional deposition process depositing nano metal particle and make described composite material on the layer surfaces externally and internally of described expanded graphite particle again; The particle diameter of described nano metal particulate is 10nm～5 μ m, and the content of nano metal particulate is the 5wt%-90wt% of composite material;
The described step that natural flake graphite is carried out chemical catalytic oxidation is:
A. get 5 parts of-10 parts of natural flake graphites by weight, add 0.5 part of-2 parts of composite catalyst, milled after the mixing 8 minutes-12 minutes, get mixed powder; Described composite catalyst is that ferric nitrate and equivalent mix in the ruthenic chloride of ferric nitrate;
B. mixed powder is joined weight portion and be 50 parts-150 parts, concentration and be in 98% the concentrated sulfuric acid, stirring reaction is 0.8 hour-1.2 hours under 40 ℃ of-50 ℃ of temperature, reactant;
C. add weight portion in the described reactant and be 5 parts-10 parts potassium permanganate, stirring reaction 2.8 hours-3.2 hours under 40 ℃ of-50 ℃ of temperature then, the secondary response thing; Described potassium permanganate under agitation divides 5-10 adding;
D. filter the secondary response thing, clean to filtrate and be neutral, oxidation product;
Described expanded method is: described oxidation product is under 150 ℃ of-200 ℃ of temperature, expanded in nitrogen, get the expanded graphite particle;
Described the expanded graphite particle the layer surfaces externally and internally on the depositing nano metal particle adopt following step to carry out:
A. with described expanded graphite particle at PH=1,10g/L SnCl
2The aqueous solution in sonicated sensitization in-16 minutes in 14 minutes, suction filtration is washed to the PH=7 of washing lotion, then:
B. at PH=1,0.5g/L PdCl
2The aqueous solution in sonicated 14 minutes-16 minutes activation, suction filtration is washed to the PH=7 of filtrate, the expanded graphite particle that must activate;
C. with the expanded graphite particle of described activation 15g/L NiSO at 70 ℃-80 ℃
46H
2O and 15g/L CuSO
46H
2After soaking 1.8 hours-2.2 hours in the O aqueous solution, filter, get filtrate;
D. described filtrate is joined in the plating bath, stirs and in 75 ℃ of-85 ℃ of platings 1 hour-3 hours, again with product after filtration, clean, oven dry, promptly;
Described electroplate liquid formulation is as follows:
NiSO
4·6H
2O 5g/L-25g/L，
NaH
2PO
4·H
2O 30g/L-50g/L，
NaC
2H
3O
2·3H
2O 14g/L-16g/L，
C
7H
7O
7·H
2O 28g/L-32g/L，
CuSO
4·6H
2O 5g/L-25g/L。
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| CN101550003B (en) * | 2009-04-22 | 2012-10-03 | 湖南大学 | Nano-graphite alkenyl composite wave-absorbing material and method of preparing the same |
| CN102513547A (en) * | 2011-12-29 | 2012-06-27 | 南京大学 | Information leakage prevention material manufacture method and nanometer metal/expanded graphite information leakage prevention materials prepared by adopting same |
| CN103752815B (en) * | 2013-12-15 | 2016-04-27 | 北京工业大学 | A kind of different-shape one-dimensional silver/manganese oxide composite preparation method and application thereof |
| CN104234500A (en) * | 2014-09-30 | 2014-12-24 | 中安瑞科（北京）科技发展有限公司 | Support type electromagnetic shielding tent |
| CN111589675B (en) * | 2020-05-18 | 2022-02-08 | 横店集团东磁股份有限公司 | High-thermal-conductivity electromagnetic wave absorption composite sheet and preparation method thereof |
| CN112867377A (en) * | 2020-12-16 | 2021-05-28 | 苏州驭奇材料科技有限公司 | Heat-conducting wave absorber and preparation method and application thereof |
| CN114390883B (en) * | 2022-01-10 | 2023-03-14 | 北京理工大学 | Throwing distributed electromagnetic damage cloud cluster and preparation method and application thereof |
| CN115872763B (en) * | 2022-12-09 | 2023-11-10 | 西北工业大学 | Ceramic electromagnetic wave absorbent and preparation method thereof |
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