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31results about How to "Absorbing frequency band is wide" patented technology
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Broadband wave-absorbing force bearing composite material and preparing method thereof
ActiveCN105196638AAbsorbing frequency band is wideImprove electrical performanceLamination ancillary operationsSynthetic resin layered productsCarbon fibersResin matrix
The invention belongs to the technical field of manufacturing radar stealth materials for military aircrafts and particularly relates to a broadband wave-absorbing force bearing composite material adopting a secondary curing process and a preparing method thereof. The material is composed of a wave-transparent foam layer, a wave-transparent skin layer, an electrical loss wave-absorbing layer and a shielding bottom layer. The wave-transparent foam layer is made of an on-sale closed-hole hard organic foam material with the thickness of 2 mm-20 mm; the wave-transparent skin layer is made of a continuous wave-transparent fiber enhancing resin matrix composite material with the thickness of 0.1 mm-4 mm; the electrical loss wave-absorbing layer is made of a wave-transparent fiber cloth enhancing composite material which contains carbon black and is 0.5 mm-5 mm thick; the shielding bottom layer is made of a carbon fiber woven cloth material. According to the broadband wave-absorbing force bearing composite material adopting the second curing process, the wave-absorbing frequency band is wider, electrical performance is stable, and the composite material can be applied to various military targets and used for manufacturing stealth structural members with high broadband stealth performance.
Owner:BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
Light broadband multi-frequency-band strong-absorption double-layer structure honeycomb wave-absorbing plate and preparation method thereof
InactiveCN110978707AHigh bandwidthHigh strengthLamination ancillary operationsSynthetic resin layered productsMulti bandHoneycomb
The invention belongs to the technical field of wave-absorbing materials, and discloses a light broadband multi-frequency-band strong-absorption double-layer structure honeycomb wave-absorbing plate and a preparation method thereof. The light broadband multi-frequency-band strong-absorption double-layer structure honeycomb wave-absorbing plate is sequentially provided with an upper-layer skin, a surface-layer wave-absorbing honeycomb core, a bonding layer, a bottom-layer wave-absorbing honeycomb core, a bottom-layer skin and a reflecting layer from top to bottom, wherein various layers are adhered, the surface of the surface-layer wave-absorbing honeycomb core is dipped with a first wave-absorbing coating material, the surface of the bottom-layer wave-absorbing honeycomb core is sprayed with a second wave-absorbing coating material, and the outer side of the second wave-absorbing coating material is dipped with the first wave-absorbing coating material. According to the invention, honeycomb is sprayed and dipped with the wave-absorbing coating material, and the impedance matching design is carried out on the upper-layer skin, the surface-layer wave-absorbing honeycomb, the bottom-layer wave-absorbing honeycomb, the bottom-layer skin and the reflecting layer, 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 so as to widen the frequency band of the honeycomb wave-absorbing plate and improve the absorption peak strength of the honeycomb wave-absorbing plate.
Owner:AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
Resin wave absorption paint and preparation method thereof
ActiveCN106977986AGood solution to the dispersion problemSolve the problem of fragmentationRadiation-absorbing paintsEpoxy resin coatingsHigh intensitySolvent
The invention provides resin wave absorption paint, which is prepared from resin, graphene and ferroferric oxide compounded material, dispersing agents, anti-settling agents and solvents. The paint is characterized in that the addition mode of graphene materials in the resin wave absorption paint is creatively changed; firstly, the graphene is compounded with a hard material of ferroferric oxide in the paint to obtain the graphene and ferroferric oxide compounded material; then, the graphene and ferroferric oxide compounding material is combined with the other ingredients to obtain the resin wave absorption paint. The graphene dispersing problem can be better solved; the complete realization of the excellent performance is ensured; the problem of mixing nonuniformity of flexible graphene materials in a paint system is solved; in addition, the uniform dispersion of ferroferric oxide nanometer particles on the surface of the graphene can be realized; the performance is better achieved; more importantly, the specific ingredients are matched to be used, so that the prepared resin wave absorption paint has the advantages of thin film layer, high intensity, strong wave absorption capability, wide wave absorption frequency band and low cost; wide application prospects are realized.
Owner:SHANDONG OBO NEW MATERIAL CO LTD
Microwave sintering method for SiC ceramic roller
ActiveCN103626501AAbsorbing frequency band is wideImprove absorbing performanceHeat conservationMicrowave sintering
The invention discloses a microwave sintering method for a SiC ceramic roller. The microwave sintering method comprises the following steps: 1) putting a green SiC ceramic roller body in an insulation apparatus and then placing the green SiC ceramic roller body and the insulation apparatus into a microwave resonant cavity together; and 2) starting a microwave source, adjusting microwave input frequency, carrying out slow heating until humidity elimination and smoke evacuation is finished, then continuously adjusting microwave input frequency, carrying out rapid heating until reflection power is stable, carrying out heating at a heating speed of 20 to 30 DEG C / min to a sintering temperature, maintaining the temperature for 5 to 15 min, then adjusting microwave input frequency and carrying out cooling to room temperature so as to obtain the SiC ceramic roller. The microwave sintering method for the SiC ceramic roller realizes rapid sintering of the SiC ceramic roller, substantially improves uniformity and stability of the performances of a sintered material, effectively avoids the phenomenon of local surface warping of a roller at a fire hole frequently occurred during conventional sintering, improves sintering yield of the SiC ceramic roller and has the advantages of short sintering time, conservation of considerable electric energy and suitability for industrial rapid production.
Owner:ZHENGZHOU UNIV
Preparation method of carbon nano tube barium titanate heterostructure composite material
ActiveCN104449559ALight in massAbsorbing frequency band is wideOther chemical processesHeterojunctionBarium titanate
The invention relates to the field of wave-absorbing materials, and particularly relates to a preparation method of a carbon nano tube barium titanate heterostructure composite material. According to the method, a processed carbon nano tube forms a cladding layer on the surface by using barium titanate, and thus a good absorption effect on an electromagnetic wave is achieved. The method is simple in process and has a good absorption effect.
Owner:ZHEJIANG SCI-TECH UNIV
Super-structure honeycomb composite wave-absorbing material
InactiveCN111086301AAbsorbing frequency band is wideHave selective absorptionSynthetic resin layered productsLaminationEpoxyFrequency wave
The invention discloses a super-structure honeycomb composite wave-absorbing material, belonging to the technical field of wave-absorbing materials. The invention particularly relates to a honeycomb structure-metamaterial composite wave-absorbing material, which is mainly composed of an upper wave-transmitting skin layer, a middle sandwiched aramid fiber wave-absorbing honeycomb wave-absorbing layer and a bottom metamaterial wave-absorbing layer, wherein the three layers of materials are bonded through an epoxy resin adhesive. The metamaterial wave-absorbing layer is formed by manufacturing ametamaterial array on a printed circuit board, and the metamaterial array is an array formed by diamond-shaped, square, hollow-square-shaped or cross-shaped metal units. A metamaterial wave-absorbingbody and the honeycomb wave-absorbing material are creatively combined, and the broadband wave absorbing performance and the low-frequency wave absorbing function of the super-structure honeycomb composite wave-absorbing material are achieved through the selective wave absorbing function of the metamaterial wave-absorbing body.
Owner:ZHEJIANG UNIV OF TECH
Electromagnetic wave absorbing material
InactiveCN102152505AEase of mass productionSimple processMetal layered productsClassical mechanicsAluminum foil
The invention discloses an electromagnetic wave absorbing material which relates to an electronic material. The electromagnetic wave absorbing material comprises a wave absorbing glue substrate and a cover layer; and the electromagnetic wave absorbing material is characterized in that an aluminium foil pasting layer is arranged between the wave absorbing glue substrate and the cover layer, the aluminium foil pasting layer is prepared from square aluminum foils which are arranged in a matrix mode, the side length of each aluminum foil is 5-9 mm, and the distance between two adjacent aluminum foils is 1-5 mm. In the invention, the wave absorbing frequency range is greatly expanded nearly without increasing the thickness of a wave absorbing body. Through rationally adjusting the graphic size of each aluminum foil, the electromagnetic wave absorbing material disclosed by the invention is also suitable for rubber plates made of different materials.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Wave absorbing material for medical apparatus and preparation method thereof
The invention provides a preparation method of a wave absorbing material for a medical apparatus. The method comprises the steps of preparation of a vinyl ferrocene-4-vinylaniline-acrylonitrile triblock copolymer, preparation of a polypyrrole tube, preparation of a beta-cyclodextrin surface modified polypyrrole tube and a wave absorbing material and the like; the wave absorbing material for the medical apparatus can efficiently treat electromagnetic pollution, reduce electromagnetic wave damage to the human body and improve the data monitoring accuracy of the medical apparatus, and has wide wave absorbing frequency bands, a good wave absorbing effect and excellent market application prospects.
Owner:CHENGDU YUYA TECH
Metal-wire-loading type electromagnetic wave absorption structure improving performances of oblique incidence
InactiveCN104320959AThe production process is simple and matureEasy to operateMagnetic/electric field screeningSquare waveformElectron
The invention relates to a metal-wire-loading type electromagnetic wave absorption structure improving the performances of oblique incidence, belongs to the technical field of electronic materials, and especially relates to an electromagnetic wave absorption structure and a method therefor. The structure consists of M*N square wave absorption units, wherein M is the number of rows, N is the number of columns, and the M and N are both natural numbers greater than two. Each square wave absorption unit comprises a metal plate and a magnetic wave-absorption material layer disposed on the metal plate, wherein the interior of the wave-absorption material layer is provided with a metal wire, and the direction of the metal wire is parallel to a side of the square wave absorption unit. Moreover, the directions of the metal wires of all the square wave absorption units are the same, and the lengths of the metal wires are less than the side lengths of the square wave absorption units. The structure can enlarge the wave-absorption frequency band under different incidence angles under the condition of reducing or increasing the thickness of the structure.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Skin scraping plate and manufacturing method thereof
InactiveCN102219485AStable structureImprove absorbing performanceSuction-kneading massageCrystal structureEngineering
The invention relates to a skin scraping plate. The skin scraping plate is prepared from the following raw materials in part by weight: 60 to 70 parts of Fe2O3, 16 to 24 parts of ZnO, 5 to 15 parts of Ni2O3, 3 to 6.8 parts of CuO, 0.1 to 0.8 part of Bi2O3, 0.2 to 0.8 part of V2O5, 0.1 to 0.2 part of Nb2O5 and 0.1 to 0.5 part of Co2O3. The invention also relates to a method for manufacturing the skin scraping plate. A skin scraping plate crystal structure is stable and reliable, has high wave-absorbing property and wide wave-absorbing frequency band and has the effects of protecting from electromagnetic radiation and protecting human health. The skin scraping plate has a health-care function. Therefore, the skin scraping plate integrates an ornament, a skin scraping plate and an electromagnetic radiation-resistant product, wherein the functions are not influenced mutually.
Owner:SHENZHEN XIANSHENG SCI & TECH DEV
Preparation method of half-carbonized iron phthalocyanine wave absorbing agent and wave absorbing agent and application of wave absorbing agent
ActiveCN104327797ALight weightImprove absorbing performanceOrganic chemistryOther chemical processesIron phthalocyanineOxidation stability
The invention discloses a preparation method of an electromagnetic wave absorbing material, in particular relates to preparation of a wave absorbing agent based on diphthalonitrile resin, and discloses the wave absorbing agent and application of the wave absorbing agent. The wave absorbing agent is prepared as follows: an iron phthalocyanine polymer is obtained by addition and solidification of diphthalonitrile with good thermostability and oxidation stability under the catalysis of ferrocene carboxaldehyde, high temperature pyrolyzing of the iron phthalocyanine polymer is performed, and the pyrolyzing degree is controlled to obtain the wave absorbing agent comprising amorphous carbon, the iron phthalocyanine polymer, iron particles and iron carbon compounds, and the wave absorbing agent is good in wave absorbing performanceand low in cost, and has a good application prospect.
Owner:INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
A kind of graphene/tetrapin zinc oxide whisker composite wave-absorbing material and its preparation method
ActiveCN104099062BEasy to makeShort reaction timeOther chemical processesHigh absorptionMaterials science
The invention discloses a compounded wave-absorbing material of grapheme / four-pin zinc oxide whisker and a preparation method thereof, and belongs to the field of microwave absorption. Natural scale graphite is used as a raw material to prepare reduction-oxidation graphene; the obtained reduction-oxidation graphene is dispersed into an alcohol solution for ultrasound treatment for 3-5 h to obtain reduction-oxidation graphene dispersion liquid with the concentration of 0.3-0.6 mg / ml; adding four-pin zinc oxide whisker into the reduction-oxidation graphene dispersion liquid, wherein the mass fraction of graphene is 4-8% and the mass fraction of four-pin zinc oxide whisker is 8-12%; performing magnetic mixing for 30-40 min wherein the rotating speed is controlled at 400-600 rpm / min and the temperature is controlled within 20-40 DEG C; placing the mixed solution into a drying oven for drying, and keeping the temperature at 60-80 DEG C for 6-8 h, so as to obtain the compounded wave-absorbing material. The preparation process is simple, the prepared wave-absorbing material is excellent in wave-absorbing property, strong in wave-absorbing ability, wide in wave-absorbing frequency band, and strong in regulatory property; high absorption at different frequency can be realized by thickness adjustment.
Owner:UNIV OF SCI & TECH BEIJING
Electromagnetic wave-absorption radiation-protection magnetic-health composite material and mouse mat
InactiveCN104045867AHas health benefitsHas absorptionSynthetic resin layered productsInput/output processes for data processingSocial benefitsElectromagnetic electron wave
The invention discloses an electromagnetic wave-absorption radiation-protection magnetic-health composite material and a mouse mat, and relates to a substance composition of an electromagnetic wave absorption material, a preparation method of the composite material, and a making method of the mouse mat. The composite material has multiple functionalities, and has very good health effects on the improvement of people's life and work environment and the improvement of people's body heath. The composite material has the advantages of strong practicality, wide use, wide prospect, and good economic and social benefits.
Owner:唐翔 +1
Metamaterial wave-absorbing structure applied to millimeter wave radar, and vehicle antenna thereof
PendingCN113745842AImprove absorbing performanceAbsorbing frequency band is wideAntenna adaptation in movable bodiesSquare waveformRadar
The invention discloses a metamaterial wave-absorbing structure applied to a millimeter wave radar, and a vehicle antenna thereof. The wave-absorbing structure comprises a plurality of square wave-absorbing units which are periodically and tightly arranged in the horizontal direction, each wave-absorbing unit comprises a metal reflecting layer, a first dielectric layer, a metasurface layer and a second dielectric layer which are sequentially stacked from bottom to top, the metal reflecting layer, the first dielectric layer and the second dielectric layer are all in a square sheet shape with the side length being p, the metasurface layer comprises two large circular wave absorbing plates and two small circular wave absorbing plates, the distance between the circle center of each large circular wave absorbing plate and the two sides of the corresponding right angle on the first dielectric layer is p / 4, and the distance between the circle center of the small circular wave absorbing plate and the two sides of the corresponding right angle on the first dielectric layer is p / 4. The wave-absorbing structure can reduce the back scattering waveform of the antenna, so that when the radar is installed in a vehicle, the wave-absorbing structure absorbs the back scattering wave of the radar, the multipath effect of the radar is reduced, and the working efficiency of the radar is improved.
Owner:DONGFENG MOTOR GRP
Preparation method of graphene-based wave absorbing material
InactiveCN108219744AImprove reaction efficiencyAbsorbing frequency band is wideOther chemical processesGrapheneMetal ions in aqueous solutionFiltration
The invention belongs to the technical field of wave absorbing materials, and particularly relates to a preparation method of a graphene-based wave absorbing material. The preparation method of the graphene-based wave absorbing material comprises the following technological steps: 1) dissolving cobalt metal salt, ammonium fluoride and urea into water to obtain a metallic salt aqueous solution; 2)putting the metallic salt aqueous solution obtained in the step 1) into a hydrothermal kettle; 3) adding graphene into a stannous chloride solution, performing sensitization and activation in sequence, performing filtration and washing to form a neutral state by using deionized water, so as to obtain pre-treated graphene; 4) adding the pre-treated graphene prepared in the step 3) into the metallicsalt aqueous solution prepared in the step 2); (5) heating and drying an alkali type carbonate / graphene material obtained in the step 4), and then performing calcination to obtain a graphene composite wave absorbing material product. The preparation method of the graphene-based wave absorbing material has the beneficial effects that a wave absorbing frequency band is wide, the operability is strong, a preparation condition is mild, a reaction process is clean and free of pollution, the reaction efficiency is high, the reproducibility is good, and the graphene-based wave absorbing material hasgreater synthesis application prospect.
Owner:BEIJING EURO & AMERICAN INST OF SCI & TECH
High-temperature-resistant wave-absorbing coating and preparation method and application thereof
ActiveCN110358334AHigh hardnessImprove adhesionFireproof paintsAnti-corrosive paintsComposite nanoparticlesCorrosion
The invention discloses a high-temperature resistant wave-absorbing coating and a preparation method and application thereof. The high-temperature resistant wave-absorbing coating mainly comprises a high-temperature resistant wave-absorbing filler, silica sol, nano-silica dispersion, an acidic medium, glass powder, ethylene glycol, a dispersant, an anti-settling agent, siloxane and the like, wherein the high-temperature resistant wave-absorbing filler comprises Fe3O4-graphene- SiO2 composite nanoparticles. The high-temperature resistant wave-absorbing coating can be naturally dried at room temperature, and can resist high temperature of 100-400 DEG C for a long time, and a formed coating layer has good adhesion with a substrate, high hardness, wide wave-absorbing frequency band, and excellent corrosion resistance and salt fog resistance.
Owner:IANGSU JINLING SPECIAL PAINT CO LTD
Wave-absorbing material with three-layer hollow structure as well as preparation method and application thereof
ActiveCN111500256ALarge hollow volumeLight in massOther chemical processesDielectric lossNanoparti cles
The invention relates to a wave-absorbing material with a three-layer hollow structure as well as a preparation method and application thereof, and belongs to the technical field of wave-absorbing materials. The wave-absorbing material with the three-layer hollow structure has various loss modes such as magnetic loss, resistance loss and dielectric loss, so that the wave-absorbing frequency band of the particle is wider, and the wave-absorbing performance is better. According to the wave-absorbing material with the three-layer hollow structure, due to the existence of the multi-layer structureand the interlayer walls, the wave-absorbing performance of the three-layer hollow nanoparticles is improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A kind of preparation method of semi-carbonized iron phthalocyanine wave absorbing agent and obtained wave absorbing agent and its application
ActiveCN104327797BLight weightImprove absorbing performanceOrganic chemistryOther chemical processesIron phthalocyanineOxidation stability
The invention discloses a preparation method of an electromagnetic wave absorbing material, in particular relates to preparation of a wave absorbing agent based on diphthalonitrile resin, and discloses the wave absorbing agent and application of the wave absorbing agent. The wave absorbing agent is prepared as follows: an iron phthalocyanine polymer is obtained by addition and solidification of diphthalonitrile with good thermostability and oxidation stability under the catalysis of ferrocene carboxaldehyde, high temperature pyrolyzing of the iron phthalocyanine polymer is performed, and the pyrolyzing degree is controlled to obtain the wave absorbing agent comprising amorphous carbon, the iron phthalocyanine polymer, iron particles and iron carbon compounds, and the wave absorbing agent is good in wave absorbing performanceand low in cost, and has a good application prospect.
Owner:INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
Strontium titanate polypyrrole nanocomposite fiber with one-dimensional core-shell structure and preparation method
ActiveCN108642604BGood one-dimensional shapeGood one-dimensional structureFilament/thread formingConjugated synthetic polymer artificial filamentsFiberStrontium titanate
The invention provides a strontium titanate / polypyrrole nanocomposite fiber with a one-dimensional core-shell structure, and a preparation method thereof. The nanocomposite fiber is composed of a polymer polypyrrole body and a barium strontium titanate nanofiber material, and the barium strontium titanate nanofiber is coated with the polypyrrole to form the core-shell structure. The barium strontium titanate / polypyrrole nanocomposite fiber with the core-shell structure is prepared by an electrospinning process combined gas phase polymerization technology, and the core-shell structure of the barium strontium titanate / polypyrrole nanocomposite fiber is formed by adopting barium strontium titanate as a hard template and polyvinylpyrrolidone as a soft template in the polymerization process. The one-dimensional fibrous wave absorbing material has obvious better wave absorbing ability than a spherical wave absorbing material, the shell thickness of the composite fiber is controllable, and the material of the shell has good electrical conductivity, so the expansion of the wave absorbing band of the composite material is benefited, and the composite nanofiber has the advantages of good one-dimensional morphology, uniform size distribution, good dispersion stability, and simple and easy preparation process.
Owner:河南皮米新材料科技有限公司
A kind of high temperature resistant wave absorbing paint and preparation method and application thereof
ActiveCN110358334BHigh hardnessImprove adhesionFireproof paintsAnti-corrosive paintsGraphiteComposite nanoparticles
The invention discloses a high-temperature-resistant wave-absorbing coating, a preparation method and application thereof. The high-temperature-resistant wave-absorbing coating is mainly composed of high-temperature-resistant wave-absorbing fillers, silica sol, nano-silica dispersion, acidic medium, glass powder, ethylene glycol, dispersant, anti-settling agent, siloxane, etc., wherein, The high temperature resistant wave-absorbing filler includes Fe 3 o 4 ‑Graphene‑SiO 2 composite nanoparticles. The high-temperature-resistant wave-absorbing coating provided by the invention can be dried naturally at room temperature, can withstand high temperatures of 100-400°C for a long time, and the formed coating has good adhesion to the substrate, high hardness, wide wave-absorbing frequency band, anti-corrosion and anti-corrosion Salt spray performance is excellent.
Owner:IANGSU JINLING SPECIAL PAINT CO LTD
A kind of preparation method of carbon nanotube barium titanate heterostructure composite material
ActiveCN104449559BLight in massAbsorbing frequency band is wideOther chemical processesBarium titanateAbsorption effect
The invention relates to the field of wave-absorbing materials, and particularly relates to a preparation method of a carbon nano tube barium titanate heterostructure composite material. According to the method, a processed carbon nano tube forms a cladding layer on the surface by using barium titanate, and thus a good absorption effect on an electromagnetic wave is achieved. The method is simple in process and has a good absorption effect.
Owner:ZHEJIANG SCI-TECH UNIV
A broadband wave-absorbing load-bearing composite material and its preparation method
ActiveCN105196638BAbsorbing frequency band is wideImprove electrical performanceLamination ancillary operationsSynthetic resin layered productsCarbon fibersRadar
The invention belongs to the technical field of manufacturing radar stealth materials for military aircrafts and particularly relates to a broadband wave-absorbing force bearing composite material adopting a secondary curing process and a preparing method thereof. The material is composed of a wave-transparent foam layer, a wave-transparent skin layer, an electrical loss wave-absorbing layer and a shielding bottom layer. The wave-transparent foam layer is made of an on-sale closed-hole hard organic foam material with the thickness of 2 mm-20 mm; the wave-transparent skin layer is made of a continuous wave-transparent fiber enhancing resin matrix composite material with the thickness of 0.1 mm-4 mm; the electrical loss wave-absorbing layer is made of a wave-transparent fiber cloth enhancing composite material which contains carbon black and is 0.5 mm-5 mm thick; the shielding bottom layer is made of a carbon fiber woven cloth material. According to the broadband wave-absorbing force bearing composite material adopting the second curing process, the wave-absorbing frequency band is wider, electrical performance is stable, and the composite material can be applied to various military targets and used for manufacturing stealth structural members with high broadband stealth performance.
Owner:BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
A kind of wave-absorbing material for medical equipment
ActiveCN109762285BSimple manufacturing methodRaw materials are easy to getPolymer scienceBULK ACTIVE INGREDIENT
The invention discloses a wave-absorbing material for medical equipment, which is prepared by the following preparation methods: (1) preparation of a modifying agent, (2) modification of polyaniline, (3) preparation of an addition polymer, (4) ) Preparation of magnetic wave-absorbing active ingredients, (5) Surface treatment of magnetic wave-absorbing active ingredients, (6) Forming of wave-absorbing materials. The wave-absorbing material for medical devices prepared by the present invention overcomes the technical problems that the traditional wave-absorbing material has a limited wave-absorbing range and the wave-absorbing effect needs to be further improved, and has the advantages of high electromagnetic wave absorption frequency band and absorption rate, compatibility, mechanical properties and The advantage of better heat resistance.
Owner:潍坊护理职业学院
Magnetic wave-absorbing structure loaded with pinpoint patch
The invention relates to a magnetic wave-absorbing structure loaded by a needle point patch, which belongs to the technical field of electronic materials. In the present invention, a wave-absorbing structure layer is arranged on the metal base plate, and the wave-absorbing structure layer includes a plurality of identical wave-absorbing units. Composed of aluminum foil patch, the cross pinpoint aluminum foil patch includes two dipoles of equal shape and size, perpendicular to each other, the dipole is composed of a rectangular part and a needle point part arranged on the narrow side of each rectangular part, the needle point part is An isosceles triangle, the center points of the rectangular sections of the two dipoles coincide. The invention has simple process, strong operability and low cost; under the condition that the thickness of the wave absorbing body is hardly increased, the wave absorbing frequency band is greatly expanded.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Broadband-adjustable non-reflection wave-absorbing device and wave-absorbing method
PendingCN113556930AAbsorbing frequency band is wideImprove working bandwidthMagnetic/electric field screeningPhysicsFree carrier
The invention discloses a broadband-adjustable non-reflection wave-absorbing device and a wave-absorbing method. The broadband-adjustable non-reflection wave-absorbing device comprises a pumping layer and a wave-absorbing layer arranged on the pumping layer, and the wave-absorbing layer comprises a wave-absorbing material; the pumping layer is used for generating pumping laser; the wave-absorbing layer is used for receiving the pumping laser, inducing free carriers in the wave-absorbing material through the pumping laser, and changing the relative dielectric constant of the wave-absorbing material through the free carriers, so that the wave-absorbing material meets a preset impedance matching condition; and the wave absorbing layer is also used for receiving incident electromagnetic waves and absorbing the incident electromagnetic waves when the wave absorbing material meets a preset impedance matching condition. According to the wave-absorbing device, the free carriers are induced in the wave-absorbing material through the pumping laser, the relative dielectric constant of the wave-absorbing material is changed through the free carriers, the electromagnetic wave-absorbing function of the wave-absorbing device is achieved, the light intensity of the pumping light can be adjusted according to the frequency of incident electromagnetic waves, the working frequency can be adjusted from microwaves to far infrared rays. And the wave-absorbing frequency band is wide and the working bandwidth is long.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
A kind of resin wave-absorbing coating and preparation method thereof
ActiveCN106977986BGood solution to the dispersion problemSolve the problem of fragmentationRadiation-absorbing paintsEpoxy resin coatingsHigh intensitySolvent
Owner:SHANDONG OBO NEW MATERIAL CO LTD
One-dimensional dual-core-shell structure nickel oxide@lanthanum nickelate@polypyrrole absorbing material and preparation method thereof
ActiveCN108517034BImprove absorbing abilityImprove absorbing performanceShielding materialsInorganic material artificial filamentsPolypyrrolePhysical chemistry
The invention provides a nickel oxide@lanthanum nickelate@polypyrrole wave-absorbing material in a one-dimensional double-core / shell structure and a preparation method thereof, wherein the material isprepared through electrostatic spinning with combination of liquid phase synthesis. The product has an excellent one-core / two-shell one-dimensional appearance, wherein the shell layer is composed oflanthanum nickelate and polypyrrole while the core layer is nickel oxide. The shell layer is 10-100 nm in thickness, which is controllable. The material has excellent wave-absorbing performance and wide wave-absorbing frequency band. The preparation method of the material is simple, is low in cost, is convenient and quick, and allows large scale production.
Owner:HENAN INST OF ENG
A kind of wave-absorbing material with three-layer hollow structure and its preparation method and application
ActiveCN111500256BLarge hollow volumeLight in massOther chemical processesDielectric lossResistive loss
The invention relates to a wave-absorbing material with a three-layer hollow structure, a preparation method and application thereof, and belongs to the technical field of wave-absorbing materials. The three-layer hollow structure wave-absorbing material of the present invention has various loss modes such as magnetic loss, resistance loss, and dielectric loss, which makes the wave-absorbing frequency band of the particle wider and better in wave-absorbing performance. The multi-layer structure and interlayer walls in the three-layer hollow structure wave-absorbing material of the present invention improve the wave-absorbing performance of the three-layer hollow nano-particles.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A heat-insulating stealthy high-temperature-resistant air inlet and its preparation method
ActiveCN107804041BGood heat insulationAbsorbing frequency band is wideLamination ancillary operationsLaminationFiberCarbon fibers
The invention provides a heat-insulation stealthy high-temperature-resistant gas inlet duct. The gas inlet duct comprises a wave-transparent layer, a heat-insulation stealth layer, an electromagneticshielding layer and a low emissivity coating from inside to outside. The wave-transparent layer is formed by a continuously oxide-enhanced oxide-based composite material; the heat-insulation stealth layer is a multilayer composite material which is formed by alternately arranging heat-insulation core layers and electromagnetic periodic structure wave absorbing layers in a matching optimizing design manner, every heat-insulation core layer is a ceramic fiber mat reinforced aerogel composite heat-insulation core layer, and the electromagnetic periodic structure wave absorbing layer is composed of a high-temperature electromagnetic periodic structure cell pattern; and the electromagnetic shielding layer is formed by carbon fibers, and the low infrared emissivity coating is sprayed on the external surface of the electromagnetic shielding layer. The heat-insulation stealthy high-temperature-resistant gas inlet duct has the advantages of good heat insulation effect, wide wave absorbing frequency band, good low-frequency wave absorbing performance and certain infrared stealth performance, and can be applied to high-speed aircrafts to solve the problems of heat insulation and radar and infrared stealth of aircraft gas inlet ducts under severe aerodynamic heating conditions.
Owner:BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
Microwave sintering method for SiC ceramic roller
ActiveCN103626501BAbsorbing frequency band is wideImprove absorbing performanceResonant cavityRoom temperature
Owner:ZHENGZHOU UNIV
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