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133results about How to "Good absorbency" patented technology
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Novel infrared and radar integrated stealth fabric and preparation method thereof
InactiveCN101995187AOvercome crackingOvercome sheddingSynthetic resin layered productsPersonal protection gearBursting strengthCoated surface
The invention discloses a novel infrared and radar integrated stealth fabric and a preparation method thereof. The stealth fabric comprises an infrared camouflage surface layer and an antistatic bottom layer in turn from outside to inside; the infrared camouflage surface layer comprises an infrared stealth layer, a fabric layer and a radar wave absorption attenuation layer in turn from outside toinside; the infrared stealth layer is compounded by using a coating coated by an infrared stealth coating and a magnetron sputtering ITO (indium tin oxide) film arranged on the surface of the coating; the radar wave absorption attenuation layer comprises a sponge body; and a wave absorption material is adsorbed on the sponge body. The stealth fabric can realize radar stealth function and infraredstealth function at the same time, has good integral wave absorption effect and low surface density of materials, and has good effects on the aspects of breaking strength, bursting strength and the like. Moreover, excessive complex processes are not adopted for manufacturing the stealth fabric, and the stealth fabric can be produced by using a conventional fabric production method, so the stealthfabric is convenient for production and easy for implementation.
Owner:WUYI UNIV
Wave absorbing body structure
ActiveCN106469858AGood absorbencyImprove absorbing performanceMagnetic/electric field screeningAntennasDielectric lossHoneycomb
The invention provides a wave absorbing body structure comprising a metal base plate and an electrical loss body covering one surface of the metal base plate. Since the electrical loss body has a high dielectric loss, the wave absorbing body structure of the present invention has a good wave absorbing effect in a wide frequency band compared with the absorbing performance of the wave absorbing material of a conventional low-loss multi-layer wave absorbing honeycomb. With the structure of the invention, not only the wave absorbing performance can be increased, but also a low surface density can be achieved for the structure due to the reduced overall thickness of the structure; accordingly, the wave absorbing body structure can be applied in fields requiring bearing and weight reducing.
Owner:佛山顺德光启尖端装备有限公司 +1
High-performance silicon-based wave absorbing material and preparation method thereof
InactiveCN102585507AExcellent electrical propertiesImprove physical propertiesOther chemical processesAviationAging resistance
The invention relates to a high-performance silicon-based wave absorbing material and a preparation method thereof. The high-performance silicon-based wave absorbing material comprises the following raw materials in percentage by weight: 12-16 percent of silicon rubber, 0.005-1 percent of a silane coupling agent, 0.6-1.2 percent of a vulcanizing agent, 3-5 percent of a flame retardant and 76.8-84.4 percent of an absorbent. The method comprises the following steps of: drying the absorbent, and grading the particle diameter of the absorbent; coating the absorbent; and mixing. The high-performance silicon-based wave absorbing material disclosed by the invention has excellent electric and physical properties, aging resistance, high and low temperature resistance and the like, and can be applied to military electronic equipment such as aviation, space flight, naval vessels and the like, working stations, computers, data communication, communication equipment and the like.
Owner:SHENZHEN DARBOND INTERFACE MATERIALS
A metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films
InactiveCN106856263AHigh strengthThinMagnetic/electric field screeningAntennasPhysicsDielectric substrate
The invention provides a metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films. The metamaterial wave-absorbing structure comprises an array formed by a plurality of wave-absorbing units. Each wave-absorbing unit is formed by multiple layers of PMI foams (1), multiple layers of PET dielectric substrates (2), the multiple layers of resistive films (3(1)-3(4)), one layer of magnetic wave-absorbing material (4) and one layer of metal earth (5), which are stacked up alternately. Two kinds of wave-absorbing structures of the magnetic wave-absorbing material and the multiple layers of resistive films are combined, and thus contradiction of the composite wave-absorbing structure between thickness and low frequency wave-absorbing characteristic is tempered. The designed novel meta-material wave-absorbing structure is high in strength and thin in thickness, and has a good wave-absorbing effect within 1GHz-18GHz ultra-wide band.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
Polyurethane foam for all-plastic plastic runway and preparation method thereof
The invention provides polyurethane foam for an all-plastic plastic runway and a preparation method thereof. The preparation method comprises the steps that 28-35% of polyether polyol, 45-52% of stuffing, 8-12% of plasticizers and 8-15% of isocyanate are weighed by weight and react at 65-70 DEG C for 3-4 hours; the isocyanato quantity in the reaction system is detected; when the isocyanato quantity is 7.0-7.5, 0.5-1.5% of silane coupling agents are dropwise added in the reaction system until the isocyanato quantity in the system is 5.0-5.5; the temperature is lowered to 50-55 DEG C, then antiaging agents are added, the temperature is lowered, filtering and packaging are performed, and polyurethane is obtained; when construction is performed, foaming agents are added at room temperature for foaming to obtain the polyurethane foam. According to the polyurethane foam, the polyurethane is modified through the silane coupling agents, the foaming efficiency is improved, the better micro-air-bag structural material is obtained, and the requirements of an elastic layer of the plastic runway are met.
Owner:JIANGMEN CHANGHE CHEM IND GRP
Polymer emulsion paint for sucking electromagnetic wave and prepn. method
InactiveCN1834172AGood absorbencyChloropene polymer coatingsRadiation-absorbing paintsCoated surfacePolymer coating
This invention discloses a method for manufacturing a polymer emulsion coating that can absorb electromagnetic waves, which adopts polymer emulsion as the coating material, and powders that can absorb electromagnetic waves and fibrous material as the fillers. Besides, film-forming assistant and surfactant are added to manufacture water polymer coating. After brushed or sprayed on the surface of architectures, the coating can form a coating layer. After vaporization of water in the coating layer, polymer particles interconnect with each other, and adheres the powders and the fibrous material to form a wave-absorption layer. The polymer emulsion coating in this invention has good electromagnetic wave-absorption property. The method has such advantages as simple process, easy operation and wide applications.
Owner:TONGJI UNIV
Double-waveband composite broadband wave absorbing material based on frequency selective surface
InactiveCN105655721AImprove absorbing performanceGood absorbencyMagnetic/electric field screeningAntennasDielectric plateResonance
The invention discloses a double-waveband composite broadband wave absorbing material based on a frequency selection surface and aims at solving a problem that a bandwidth of an existing wave absorbing material in a low frequency band is not wide enough. The material comprises a matrix material layer, the frequency selection surface, a dielectric plate and a floor. The frequency selection surface and the floor are printed on upper and lower surfaces of the dielectric plate respectively. The matrix material layer and the dielectric plate form an up-down stack structure. The frequency selection surface is formed through periodically arranging M*N passive resonance units, wherein the M is greater than or equal to 3 and the N is greater than or equal to 3. Each passive resonance unit is formed by a square ring paster and a deformed Jerusalem cross type paster located in an internal portion, and central points of the two are superposed. The deformed Jerusalem cross type paster is formed by a middle cross, four circular rings which are located on a middle cross axis and are successively connected to the middle cross axis and four I-shaped structures. The material possesses advantages that an absorption frequency band is wide and a wave absorbing characteristic is high. Absorption and shielding of electromagnetic waves in C and X wave bands can be realized. The material can be used for fields of communication, environmental protection, human body protection and the like.
Owner:XIDIAN UNIV +1
Wave simulation generating device under high gravity field
ActiveCN109141819AGuaranteed similarityImprove absorbing performanceHydrodynamic testingWave shapeReflected waves
The invention discloses a wave simulation generating device under a high gravity field. The adoption of a wave absorbing unit can enhance the wave absorbing effect, reduce the influence of a reflectedwave on a waveform, and ensure the similarity of a wave simulation experiment to real environment simulation. The wave absorbing unit can adjust the position of a wave absorbing plate and the size ofa grating opening according to the waveform generated by a wave generating unit so as to ensure an optimal wave absorbing effect. The wave generating unit realizes force transfer and the decoupling of motion in a simple structure. Compared with a transmission structure with a long transmission path and a complicated structure, the wave simulation generating device is less affected by mechanism jamming caused by deformation of a centrifugal field and ensures the rigidity and stability of a transmission mechanism more easily. Different from a conventional way of moving a push plate as a whole,only the upper part of the push plate is pushed, and so the load on the push plate is small and required power is small. The wave simulation generating device under a high gravity field is suitable for simulation of waves with high water depth and large amplitude.
Owner:GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
Wave-absorbing structure of double-frequency polarized insensitive monolayer metamaterial
InactiveCN106450795ALow profilePolarization stableRadiating elements structural formsDielectric plateDiagonal
The invention relates to a wave-absorbing structure of a double-frequency polarized insensitive monolayer metamaterial. The wave-absorbing structure comprises a metamaterial structure surface, a dielectric plate and a metal base plate. The metamaterial structure surface comprises a square metal patch and four identical composite metal structures surrounding the square metal patch. Each composite metal structure comprises four 'T'-shaped structures, and every two 'T'-shaped structures are symmetrical to each other by taking the straight line, where one diagonal line of the middle square metal patch is located, as the center. By the wave-absorbing structure, the defects of single-frequency-point wave absorption, sensitiveness to polarization and large relative thickness of wave-absorbing materials are overcome.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Transparent ultra-wideband microwave absorber based on transparent conductive film
The invention discloses a transparent ultra-wideband microwave absorber based on a transparent conductive film. The transparent ultra-wideband microwave absorber comprises a transparent substrate andthe transparent conductive film which is coated on the two surfaces of the transparent substrate. Periodically distributed wave absorbing structures are etched on the corresponding film of the microwave incident surface. Impedance matching of the impedance of the wave absorbing structures and the impedance of electromagnetic waves in the free space can be realized under the electromagnetic waves of the unabsorbed frequency. The absorbing bandwidth of the wave absorber can be 23.4 GHz, the overall thickness is 1.1mm, the bandwidth is only 0.11 time of the corresponding wavelength of 32.5GHz center frequency and the microwave absorber is insensitive to the polarization angle.
Owner:NANJING UNIV OF SCI & TECH
High-performance through hole foamed aluminum material and preparation process thereof
ActiveCN109465426ALarge specific surface areaOvercome energy absorptionProduction lineEnergy absorption
The invention relates to a preparation process of a high-performance through hole foamed aluminum material. The preparation process mainly comprises the steps that prepared transition filling balls are placed into a casting mold, after vibration operation and preheating treatment, the prepared transition filling balls are moved into a negative pressure device, a negative pressure valve is startedto form negative pressure in a mold cavity, molten aluminum alloy molten liquid is cast, and the clearances between the balls are evenly full of the aluminum alloy molten liquid in a penetration manner under the action of negative pressure and heat balance; and after cooling, the mold is demounted, cutting and slicing or modeling processing is carried out, the transition filling balls are clearedaway and removed through production lines of ultrasonic cleaning, high-pressure water cleaning, high-pressure gas cleaning and drying cleaning, three-dimensional through ball-shaped pore cavities aredistributed in an obtained aluminum alloy matrix, and the regular ball-shaped pore cavities are independently and evenly distributed in the matrix, and the ball-shaped pore cavities are connected through through holes. The specific surface area of the matrix is large, and the physical, mechanics and mechanical properties are better on the aspects of damping, energy absorption, sound insulation andnoise reduction, heat insulation, electromagnetic shielding, impacting force resistance, permeability and the like.
Owner:王楷煌
Wave absorbing coating and preparation method thereof
InactiveCN106118145AImprove adhesionImprove thermal conductivityRadiation-absorbing paintsAdhesiveHeat conducting
The invention relates to a wave absorbing coating and a preparation method thereof. The wave absorbing coating is prepared from, in percentage by mass, 88%-98% of a wave absorbing material adhesive, 1%-10% of a wave absorbing material and 0.5%-2% of an aid. During preparation, all components are mixed in proportion. The wave absorbing coating has the advantages of thin coating, good adhesion capability, high strength, good heat conducting property, low cost and the like.
Owner:GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD +1
Polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and preparation method thereof
ActiveCN107177053AExcellent dielectric propertiesIncreased interfacial polarization capabilityOther chemical processesNitrateCobalt
The invention relates to a polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and a preparation method thereof; the preparation method comprises: adding degummed dried silicon carbide fiber cloth in solution A to carry out hydrothermal reaction, taking out the silicon carbide fiber cloth after reacting, and annealing to obtain nickel cobaltate-silicon carbide fiber multi-scale reinforcement, wherein the solution A is made by adding cobalt nitrate, nickel nitrate and urea in water and stirring well; brushing polyamide acid solution evenly to the outer surface of the nickel cobaltate-silicon carbide fiber multi-scale reinforcement, and stacking neatly to obtain a preform; subjecting the preform to a multiple repeat process of vacuumizing, pressure holding, and relief, and performing mold pressing to obtain the polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement. Nickel cobaltate is grown on the surface of silicon carbide fiber, interfacial polarizing capacity and electrical conductivity of the composite are improved, and good wave-absorbing performance and mechanical properties are achieved.
Owner:SHAANXI UNIV OF SCI & TECH
Wave-absorbing metamaterial, antenna cover and antenna system
ActiveCN105789912APromote absorptionResolve reflectionRadiating element housingsReflectivityMetamaterial
The invention provides a wave-absorbing metamaterial, an antenna cover and an antenna system. By adoption of the wave-absorbing metamaterial, decline of reflectivity can be realized under conditions of vertical incidence and large-angle incidence. The wave-absorbing metamaterial comprises a magnetic electromagnetic wave material layer and a conductive geometric structure layer combined with the magnetic electromagnetic wave material layer, wherein the conductive geometric structure layer comprises multiple conductive geometric structure units arranged in sequence; each conductive geometric structure unit comprises a non-closed annular conductive geometric structure; and two strip-shaped structures which are arranged in parallel relatively are arranged at the position of more than one opening of each annular conductive geometric structure.
Owner:KUANG CHI INST OF ADVANCED TECH
Silicon carbide fiber reinforced ceramic based structure wave absorption composite material and preparation method thereof
The invention relates to a silicon carbide fiber reinforced ceramic based structure wave absorption composite material and a preparation method thereof. The silicon carbide fiber reinforced ceramic based structure wave absorption composite material is prepared from the following ingredients in percentage by volume: 30 to 40 percent of SiC fiber prefabricated bodies, 25 to 40 percent of SiC ceramicsubstrates and 20 to 45 percent of oxide ceramic substrates. Firstly, the SiC fiber prefabricated bodies are subjected to degumming treatment and drying; SiC is decomposed onto the SiC fiber prefabricated body subjected to the degumming treatment and drying; an SiCf / SiC wave absorption composite material is prepared; the obtained SiCf / SiC wave absorption composite material is soaked into silica sol, aluminum sol or zirconium sol; high-temperature treatment is performed; the silicon carbide fiber reinforced ceramic based structure wave absorption composite material is obtained. The SiCf / SiC ceramic with a certain porosity is firstly prepared; then, the materials are soaked into silica sol, aluminum sol or zirconium sol for hihg-temperature treatment; a compact double ceramic base compositematerial is obtained; the dielectric constant of the wave absorption composite material is effectively regulated and controlled; the good wave absorption effect is achieved.
Owner:QINGHAI UNIVERSITY
Heat-conducting and wave-absorbing material and preparation method thereof
ActiveCN108276773AGood absorbencyImprove absorbing performanceHeat-exchange elementsHeat conductingSolvent
The invention provides a heat-conducting and wave-absorbing material and a preparation method thereof, wherein the heat-conducting and wave-absorbing material is prepared from the following raw materials by weight: 200-400 parts of vinyl organosilicon, 150-550 parts of Si-H organosilicon, 0.1-5 parts of hydrogen-containing silicone oil, 50-400 parts of iron-silicon aluminum alloy magnetic powder,20-300 parts of SiO2 powder, 0.1-10 parts of a silane coupling agent, 0.005-0.5 part of a platinum catalyst, and 20-500 parts of a solvent. According to the present invention, the specific componentsare matched according to the specific ratio, such that the obtained heat-conducting and wave-absorbing material can excellent absorb K[alpha] electromagnetic waves so as to produce good electromagnetic absorption, and further has good thermal conductivity and good physical and mechanical property so as to easily achieve the normal operation of electronic equipment and improve the service life of the electromagnetic material.
Owner:ZHEJIANG SAINTYEAR ELECTRONICS TECH
Technique for extracting edible natural red color element from psammophyte of nitraria
The present invention relates to an extraction process for extracting edible natural red coloring matter from psammophyte nitraria sibiria. Said invention uses the fruit of wild nitraria sibiria as raw material and adopts the processes of ethyl alcohol extraction, removing impurities, concentrating and drying so as to obtain the invented product which has high color fastness for protein, starch and sugar, etc. and can be used for coloring beverage, sweets, liquor and other foods.
Owner:青海康普生物科技股份有限公司
High-elastic wave-absorbing heavy-duty anticorrosive nano-coating
Disclosed is high elasticity wave-absorbing anticorrosion nanometer coating with the weight ratio composition of 1-5% nanometer titanium alloy, 1-10% carbon fiber, 1-10% copper powder, 13-25% T-ZnO, 15-30% magneto plumbite type ferrite and 25-68% epoxy modified acrylic acid elastic resin; the radius of nanometer titanium alloy is 20- 50nm; the radius of carbon fiber is 20-30nm and the length of carbon fiber is 100-500nm; the radius of the particle of copper powder is 20-30nm; the radius of the particle of T-ZnO is 40-70nm; the radius of magneto plumbite type ferrite is 20-100nm and the length is 100-300nm; the Rho of epoxy modified acrylic acid elastic resin is equal to 1.1-1.2. The high elasticity wave-absorbing anticorrosion nanometer coating has super strong anticorrosion property and avoids the device from corrosion when the device operates under badly corrosive environment for long time; the anticorrosion nanometer coating is bonded firmly with the substrate and has the advantages of high elasticity and good wave-absorbing performance.
Owner:中油新星纳米工程技术有限公司
Preparation method of ultrathin paper-base wave-absorbing material
InactiveCN107418512AGood absorbencyImprove smoothnessOther chemical processesFiberSecondary emission
Owner:赵顺全
PET/blast furnace slag composite cement-based wave-absorbing material and preparation method thereof
InactiveCN106904893AMeet the mechanical performance requirements of engineering applicationsExcellent electromagnetic wave absorption performanceSlagMechanical property
The invention provides a PET / blast furnace slag composite cement-based wave-absorbing material and a preparation method thereof, belonging to the field of cross technology of electromagnetism and material science. The PET / blast furnace slag composite cement-based wave-absorbing material is prepared from the following raw materials: PET fragments, blast furnace slag, a wave-absorbing agent, polypropylene fiber, cement and water. The PET / blast furnace slag composite cement-based wave-absorbing material provided by the invention meets requirements on mechanical properties in engineering application, and has good electromagnetic wave absorption properties in a range of 2 to 18 GHz, a wide absorption frequency range, minimal reflectivity of -30 dB or below and a bandwidth of 12 GHz or above when reflectivity is -8 dB or below; and the prepared wave-absorbing material is low in density and thickness, high in strength, low in cost and simple in construction process.
Owner:HAINAN UNIVERSITY
Cobalt/polypyrrole nano-composite wave-absorbing material and preparation method thereof
The invention discloses a cobalt / polypyrrole nano-composite wave-absorbing material and a preparation method thereof. The method includes: adopting CoCl2.6H2O as the raw material and taking NaBH4 as a reducing agent, firstly synthesizing nano-cobalt powder, then placing the nano-cobalt powder and a pyrrole monomer in a hydrochloric acid solution, and carrying out in situ polymerization to obtain the cobalt / polypyrrole nano-composite wave-absorbing material with a core-shell structure. By adopting the liquid phase chemical reduction technique and the in-situ polymerization technique, the cobalt / polypyrrole nano-composite wave-absorbing material with excellent wave-absorbing properties can be prepared.
Owner:YANCHENG INST OF TECH
Antenna
ActiveCN105811118AImprove electrical performanceImprove front-to-back ratioRadiating element housingsPolarised antenna unit combinationsPhysicsCross polarization
The invention relates to an antenna. By the antenna, the front-to-back ratio and the cross polarization isolation can be improved on the condition of no change on a structure of a reflection plate. The antenna comprises an antenna oscillator and the reflection plate, wherein the antenna oscillator is arranged on the reflection plate, the antenna also comprises a wave absorption material layer, and the wave absorption material layer is arranged on one side of the outer surface, departing from the antenna oscillator, of the reflection plate.
Owner:KUANG CHI INST OF ADVANCED TECH
Method for preparing ITO/porous carbon composite wave-absorbing material by taking In-MOFs as template
ActiveCN110746931AExcellent lightweight microwave absorption performanceGood absorbencyOther chemical processesPorous carbonPyrolysis
The invention relates to a method for preparing a composite wave-absorbing material, and concretely relates to a method for preparing an ITO / porous carbon composite wave-absorbing material by taking In-MOFs as a template. The method for preparing the ITO / porous carbon composite wave-absorbing material by taking In-MOFs as the template is provided to solve the technical problems of complex preparation method, high device requirements and high cost of existing carbon-based microwave-absorbing materials. The method comprises the following steps: 1, preparation of the In-MOFs template; and 2, pyrolysis. Compared with preparation methods of the existing carbon-based microwave-absorbing materials with the problems of complex preparation method, high device requirement and high cost, the preparation method of the invention has the advantages of simple process, low production cost, simplicity and convenience in subsequent treatment, and no complex synthesis device, and is suitable for industrial large-scale production.
Owner:NANCHANG HANGKONG UNIVERSITY
Continuous casting method for low-alloy steel wide and thick slabs
The invention discloses a continuous casting method for low-alloy steel wide and thick slabs. The continuous casting method comprises the following steps: pouring molten steel from a tundish into a crystallizer; in the crystallizer, adding casting powder on the liquid level of molten steel; cooling in the crystallizer, so that the molten steel is solidified into casting blanks with liquid cores, and then continuously pulling out the casting blanks with the liquid cores from the outlet of the crystallizer at a pulling speed Vc to pass through a secondary cooling zone so as to obtain completely solidified casting blanks, wherein the pulling speed Vc is controlled at 1.2-1.8 m / min, the binary basicity of the casting powder is 0.85-1.05, the viscosity of the casting powder is 0.05-0.15 Pa.s at 1300 DEG C, and the melting point of the casting powder is 1050-1150 DEG C. As the physical and chemical properties of the casting powder are reasonably controlled, the continuous casting method can effectively reduce the steel leakage alarm rate and that the continuity of production and the product quality are ensured is facilitated.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Wave-absorbing invisible bulletproof plate of integrated structure and preparation method of wave-absorbing invisible bulletproof plate
ActiveCN112414218AGood adhesionImprove the defect of easy delaminationProtective equipmentCarbon fibresEpoxyGlass fiber
The invention discloses a wave-absorbing invisible bulletproof plate of an integrated structure and a preparation method of the wave-absorbing invisible bulletproof plate. The invisible bulletproof plate sequentially comprises a glass fiber reinforced plastic plate layer, an invisible bulletproof layer and a carbon fiber composite material layer from outside to inside; the invisible bulletproof layer is obtained by alternately laminating fiber reinforced composite material layers and wave-absorbing material layers; composite materials in the fiber reinforced composite material layers are ultra-high molecular weight polyethylene fiber reinforced polyethylene-based composite materials or aramid fiber epoxy resin-based composite materials; and the thickness of the invisible bulletproof plateis smaller than or equal to 23 mm. The preparation method comprises the following steps that the fiber reinforced material layers and the wave-absorbing material layers are alternately laminated to form the invisible bulletproof layer, then the invisible bulletproof layer, the glass fiber reinforced plastic plate layer and the carbon fiber composite material layer are adhered, the adhered invisible bulletproof plate is pressed, and the edge is sealed to obtain the wave-absorbing invisible bulletproof plate. The prepared integrated invisible bulletproof plate is light in weight and small in thickness, can resist rifle shooting, has excellent wave-absorbing performance, and is simple in preparation method.
Owner:HUNAN BOOM NEW MATERIALS
Flat amorphous alloy powder and electromagnetic wave absorber containing same
InactiveCN101624689AEasy to makeGood absorbencyMagnetic/electric field screeningElectromagnetic wave absorberPolymer insulation
The invention relates to a flat amorphous alloy powder and a preparation method thereof. The composition of the flat amorphous alloy powder satisfies the following chemical formula expressed in an atomic ratio: Fe<(100-a-b-c-x-y-z-t)>CraMbTcPxSiyBzCt, wherein M is selected from Mo or Nb; T is selected from one of or both Sn and Al; and a, b, c, x, y, z and t expressing the atomic composition percentage are respectively: a is more than or equal to 1 and smaller than or equal to 5; b is more than or equal to 1 and smaller than or equal to 5; c is more than or equal to 2 and smaller than or equal to 4; a plus b is more than or equal to 2 and smaller than or equal to 8; x is more than or equal to 2 and smaller than or equal to 15; y is more than or equal to 1 and smaller than or equal to 8; z is more than or equal to 1 and smaller than or equal to 12; and t is more than or equal to 0.5 and smaller than or equal to 6. The invention also relates to an electromagnetic wave absorber containing the powder. The electromagnetic wave absorber is formed by compounding the flat powder and a polymer insulating material, and has an excellent electromagnetic wave absorption characteristic within a frequency range of 10MHz to 3GHz.
Owner:ADVANCED TECHNOLOGY & MATERIALS CO LTD
Bimetallic oxide-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material and preparation method thereof
The invention relates to a bimetallic oxide silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material and a preparation method thereof. The method comprises the following steps: degumming a silicon carbide fiber cloth, and drying the degummed silicon carbide fiber cloth; growing a nickel cobaltate, zinc cobaltate or manganese cobaltate precursor on the surface of the dried silicon carbide fiber cloth through a hydrothermal technology, and annealing the obtained silicon carbide fiber cloth to form bimetallic oxide-silicon carbide fiber multi-scale reinforcements; uniformly coating the external surfaces of the bimetallic oxide-silicon carbide fiber multi-scale reinforcements with an aluminum phosphate slurry, laminating the coated reinforcements, and carrying out vacuum impregnation to obtain a fiber prepreg; and molding the fiber prepreg to obtain the bimetallic oxide silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material. Bimetallic oxide grows on the surface of the SiC fiber to effectively regulate the dielectric constant of SiCf / AlPO4 structure wave absorbing material, and makes the structure wave absorbing material have good wave absorbing effect and good mechanical properties.
Owner:SHAANXI UNIV OF SCI & TECH
Carbon black reinforced metal-based micro-nano powder with high light absorbing property and preparation method thereof
The invention discloses a carbon black reinforced metal-based micro-nano powder with a high light absorbing property and a preparation method thereof. The micro-nano powder comprises the following components in percentage by mass: 0.5-1.5 percent of nanometer carbon black powder and 98.5-99.5 percent of micron metal powder, wherein the sum of the two components is 100 percent; the nanometer carbon black powder is coated on the surface of the micron metal powder through one or more of embedding, adhesion or chemical bond combination, so as to form a core-shell structure micro-nano powder using the micron metal powder as a core and the nanometer carbon black powder as a shell; and the preparation process of the micro-nano powder mainly comprises following steps: preparation of a nanometer carbon black suspension, spheroidization pre-treatment of the micron metal powder, ball-milling compounding of the nanometer carbon black suspension and the pre-treated micron metal powder , and drying of ball-milled and compounded micro-nano powder slurry. The carbon black reinforced metal-based micro-nano powder with the high light absorbing property, disclosed by the invention, has the advantages that very good absorbing rate of laser lights is obtained; requirements on the traditional laser forming mainstream technology for conveying the powder by using a direct powder feeding type laser forming technology can be met; and meanwhile, the manufactured thin-walled piece has very good quality in both shape control aspect and property control aspect.
Owner:JIANGSU UNIV
Chiral poly-schiff base cobalt salt composite wave-absorbing material
ActiveCN108299833AStrong absorbing performanceReduce thicknessOther chemical processesParaffin waxSolvent
The invention discloses a chiral poly-schiff base cobalt salt composite wave-absorbing material. The chiral poly-schiff base cobalt salt composite wave-absorbing material is prepared by preparing chiral poly-schiff base cobalt salt by a solvothermal method; compounding the chiral poly-schiff base cobalt salt with graphene; finally, adding a paraffin substrate. The chiral poly-schiff base cobalt salt and the overall composite material are in the mass ratio of (7.5 to 8.57) to 10; the graphene and the overall composite material are in the mass ratio of (1.43 to 2.5) to 10; the paraffin substrateand the overall composite material are in the mass ratio of 7 to 10. The chiral poly-schiff base cobalt salt composite wave-absorbing material is simple in preparation process, is low in density, high in wave absorbing capacity and wide in wave absorbing frequency band, and has a broad application prospect in the aspects, such as invisibility, electromagnetic radiation resistance, electromagneticshielding and the like.
Owner:NANCHANG HANGKONG UNIVERSITY
Method for recovering methyl chloride from methyl chloride waste gas
InactiveCN108586190AGood absorbencyGood solubilityHalogenated hydrocarbon separation/purificationGlyphosate toxicityBenzene
The invention discloses a method for recovering methyl chloride from methyl chloride waste gas. The method comprises the steps that absorbing liquid and the waste gas are in reverse contact in an absorbing tower, most of the waste gas is absorbed by the absorbing liquid, extracted from the bottom of the absorbing tower and then separated through rectification to collect the methyl chloride with amass percentage of 99.9% or above and the absorbing liquid, the rest of the waste gas is extracted from the top of the absorbing tower, and a solvent is recovered after cooling and flashing are conducted. Glyphosate is a common herbicide, and the preparation process of the gherbicide produces methyl chloride waste gas byproducts. According to the method, the absorbing liquid used for recovering the methyl chloride waste gas is the composition with any proportion of one or more than two of benzene, ethanol and dichloroethane. By means of the method, high purity methyl chloride is recovered fromthe methyl chloride waste gas, the consumption amount of the absorbing liquid in the whole operation process is less, the absorbing liquid can be recycled, the obtained high purity methyl chloride can be sold as byproducts, and the waste gas processing amount and the harm on the environment are greatly reduced.
Owner:山东海昆化工技术有限公司 +1
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