691results about How to "Improve shielding effect" patented technology

The invention discloses a single-end open type high-performance magnetic shielding system and a design method thereof. The system is formed by combining a passive magnetic shielding subsystem and an active magnetic compensation subsystem. The passive magnetic shielding subsystem is formed by alternately nesting single-end open type high-permeability and high-conductivity metal barrels, and the structure is beneficial to synchronously improving the shielding capability for full-band magnetic interference; the active magnetic compensation subsystem is composed of a group of axial nonlinear gradient coils, two groups of radial nonlinear gradient coils with orthogonal magnetic fields and a magnetic compensation control circuit, and three groups of magnetic compensation coil windings are obtained based on specific nonlinear distributed magnetic interference reverse design in a single-end open type magnetic shielding barrel; different from conventional shimming and linear gradient coils, accurate compensation of magnetic interference in a working area in the barrel can be realized. According to the invention, the shielding capability of the single-end open type magnetic shielding system is improved, and a required near-zero magnetic environment is provided for extremely weak magnetic measurement.

The invention relates to a composite electromagnetic shielding structure for a power terminal and a preparation method thereof, the structure comprises an accommodating shell, the accommodating shell is formed by connecting a plurality of composite electromagnetic shielding plates, and each composite electromagnetic shielding plate comprises an inner surface shielding layer and an outer surface shielding layer which are attached to each other; a heat conduction layer is arranged between the inner surface shielding layer and the outer surface shielding layer, and the inner surface shielding layer is located in the accommodating shell; a protective layer is arranged on the outer layer of the outer surface shielding layer and comprises an insulating layer and a waterproof layer, and the waterproof layer is located on the outer layer of the insulating layer; the outer surface shielding layer is made of a low-frequency electromagnetic field shielding material formed by mixing amorphous magnetic alloy powder, magnetic fibers and nickel powder; and the inner surface shielding layer is made of a high-frequency electromagnetic shielding material formed by mixing silicon carbide and resin foam rubber fibers. The structure can cope with various electromagnetic interference environments, provides electromagnetic shielding protection, and also has better electromagnetic shielding effectiveness for electromagnetic interference of different frequency bands.

The invention relates to the technical field of special coating materials, in particular to a high-temperature-resistant heavy-duty anticorrosive fluorosilicone polymer coating as well as a preparation method and application thereof. The high-temperature-resistant heavy-duty anticorrosive fluorosilicone polymer coating is prepared from the following components in parts by mass: 80-100 parts of fluorosilicone resin, 10-15 parts of a nano anticorrosive material, 5-15 parts of wear-resistant powder, 5-10 parts of an anti-rust pigment, 1-2 parts of a siloxane dispersant, 1-2 parts of a polysiloxane defoaming agent, 1-2 parts of an organic silicon leveling agent, 1-3 parts of a polyamide wax anti-settling aid and 25-35 parts of an amino curing agent. 2 to 5 parts of an amino silane coupling agent; and the fluorosilicone resin has the molecular weight of 8000-12000 and contains silicon oxygen bonds. The high-temperature-resistant heavy-duty anti-corrosion fluorosilicone polymer coating prepared by the invention improves the adhesive force to a substrate, can be cured at normal temperature, and has excellent high-temperature anti-corrosion performance.

The invention discloses a handle-locked two-core single-ended waterproof high-voltage connector, which is provided with a handle arranged outside a head shell assembly and used for connecting a plug and a socket, the socket comprises a socket shell, and a socket shielding cover, jacks, a socket outer sealing ring, a socket inner sealing ring, a signal pin assembly and the like which are arranged in the socket shell; through multi-stage waterproof, the socket can independently seal water vapor when the plug and the socket are not plugged in each other. According to the invention, the plug and the socket are plugged and fixed in a quick handle locking manner, so that the reliability of plugging and fixing of the plug and the socket is ensured; the connector socket has an independent waterproof function, and can protect a plate end from water vapor entering to cause damage to a device under a special working condition; a multi-lip sealing ring is adopted for waterproof sealing, and compared with a conventional O-shaped sealing ring for single-layer protection, the structure is more reliable, and good sealing performance and anti-aging performance are achieved; and through a shielding conduction structure, the whole connector has good electromagnetic shielding effectiveness and mechanical strength.

The invention discloses a composite cable containing an electromagnetic shielding material and a manufacturing method thereof, the composite cable containing the electromagnetic shielding material comprises an insulating sheath, a conductive wire core and a shielding layer, the insulating sheath wraps the conductive wire core, the shielding layer is embedded in the insulating sheath, the shielding layer comprises a semiconductor and graphene, and the semiconductor and the graphene are arranged in the insulating sheath. A strip-shaped semiconductor is heated to a molten state in a smelting furnace, the surface of the molten semiconductor is coated with graphene, shielding bodies of the semiconductor and the graphene are obtained through cooling, every two shielding bodies form a spatial double-helix structure, and the multiple shielding bodies are woven to form a woven belt-shaped structure. A method for manufacturing the composite cable comprises the following steps: combining the graphene wire core with the metal copper core to obtain the conductive wire core; and then an inner insulating layer, a heat dissipation layer, a shielding layer, a waterproof layer and an outer insulating layer are sequentially coated on the conductive wire core. The semiconductor and the graphene are woven on the periphery of the conductive wire core to form a barrier of a double-helix structure, the effect of isolating a magnetic field is achieved, and the electromagnetic shielding performance is improved.

The invention discloses an environment-friendly safe low-smoke halogen-free cable, and relates to the technical field of cables, the environment-friendly safe low-smoke halogen-free cable comprises a cable assembly, the cable assembly comprises an outer sheath, the outer surface of the outer sheath is fixedly communicated with an air outlet assembly, a plurality of conductors are arranged in the outer sheath, each conductor is hollow, and the outer surface of the outer sheath is fixedly communicated with the air outlet assembly. A plurality of filling pipes are arranged among the exteriors of the plurality of conductors, and the plurality of filling pipes are hollow; according to the environment-friendly safe low-smoke halogen-free cable, when the temperature of air around the cable is low, cold air enters the hollow conductor from the air inlet, air convection is formed in the conductor, heat is taken away and then discharged from the air outlet, and when excessive heat is generated in the use process of the conductor, the heat can enter the filling pipe through the multiple drainage holes, so that the cable is protected. And heat can flow in the conductor, so that excessive local heat dissipation of the conductor can be prevented.

The invention relates to the technical field of cables, and provides an anti-electromagnetic interference control cable, which comprises a group of wire cores, a wrapping layer wrapped outside the group of wire cores, a first shielding layer wrapped outside the wrapping layer, an outer sheath wrapped outside the first shielding layer, a filling layer, a butt joint sleeve, a butt joint assembly, an electromagnetic shielding assembly and a thermal shrinkable sleeve, a filling layer is arranged outside one group of wire cores, a wrapping layer is coated outside the filling layer, butt joint sleeves are detachably mounted at two ends of each wire core, a butt joint assembly is fixedly mounted between each group of adjacent wire cores, an electromagnetic shielding assembly is mounted on each butt joint assembly, and a thermal shrinkable sleeve is fixedly mounted between two opposite outer sheaths. The cable solves the problem that the anti-electromagnetic interference capability of the cable is reduced due to the fact that the joint of the cable is prone to electromagnetic interference and electromagnetic leakage caused by the lack of good shielding and insulation protection in the prior art.

The invention discloses a zigzag structure-based low-pass high-absorption energy selection surface, which comprises a plurality of periodically distributed units, each unit sequentially comprises a frequency selection layer, a dielectric layer and an energy selection layer from top to bottom, the frequency selection layer comprises a first dielectric substrate and a plurality of metal zigzag structures and resistors on the upper surface and the lower surface of the first dielectric substrate, and the metal zigzag structures and the resistors are arranged on the upper surface and the lower surface of the first dielectric substrate. The selectable layer comprises a second dielectric substrate, and a plurality of metal block structures and diodes on the upper surface of the second dielectric substrate; and the frequency selection layer and the selectable layer are separated by the dielectric layer. The energy selection surface and the frequency selection surface are matched in impedance through the dielectric layer, so that when low-power electromagnetic waves are incident, a low-frequency passband with low insertion loss is realized, and a relatively wide absorption frequency band is formed outside the passband; and when high-power electromagnetic waves are incident, a reflection frequency band with relatively high shielding effectiveness is realized in a working frequency band, and a relatively wide absorption frequency band is formed outside the band. The device is simple and clear in overall design structure principle and has a wide application prospect.

The invention discloses a high-flexibility bending-resistant synchronous twisted-pair shielding flame-retardant towline cable, and relates to the technical field of cables, the towline cable comprises a plurality of chain links, the plurality of chain links form a towline, the inner side of each chain link is provided with a cable structure, each chain link is provided with a cable blocking structure, the cable structure comprises an outer sheath layer, and the outer sheath layer is provided with an outer sheath layer. The inner side of the outer coating layer is provided with a braiding layer, the inner side of the braiding layer is provided with a wrapping layer, the inner side of the wrapping layer is provided with a core wire, the inner side of the core wire is provided with a conductor, the inner side of the wrapping layer is provided with a filler, and the cable structure is formed by synchronously completing pair twisting and total twisting of five types of oxygen-free copper flexible conductor wires or six types of oxygen-free copper flexible conductor wires. The outer diameter of the finished cable is small, the bending resistance of the cable structure is enhanced, the phenomenon that the cable structure is prone to open circuit and short circuit in the high-frequency bending process is avoided, and meanwhile, through the cooperative use of the cable blocking structure and the disassembly and assembly structure, when the single cable structure is damaged, independent disassembly and replacement can be carried out.

The invention relates to a shape memory polyimide composite material with a spider-silk-like microstructure and a preparation method and application thereof. According to the method, the composite material is designed by coupling the spider-silk-like microstructure, shape memory polyimide, a flame retardant and an electromagnetic shielding two-dimensional intercalation compound. Conductive polyaniline and transition metal carbon / nitride are subjected to an intercalation reaction to prepare a Ti3C2Tx-coated PANI intercalation compound, then the Ti3C2Tx-coated PANI intercalation compound is compounded with SMPI to serve as a spider-silk-like microstructure to enhance the mechanical strength and electromagnetic shielding performance of a resin matrix, and when the thickness of the SMPI composite material is 100 micrometers, the electromagnetic shielding effectiveness of the SMPI composite material in the X wave band exceeds 25 dB, and 99% or above of incident microwaves are effectively shielded. In addition, the flame retardant grade of the composite material reaches V0 grade, the limit oxygen index is 39.1%, the composite material also has high temperature resistance and shape memory characteristics, the shape fixation rate is 96%, and the shape recovery rate is 97%. The composite material not only can eliminate electromagnetic interference, but also can resist flame, can be automatically deformed, and is applied to the fields of self-adaptive deformation thermal management electromagnetic shielding devices, intelligent wearable equipment and the like.

The invention discloses a compression-resistant and torsion-resistant energy storage cable and a preparation method thereof, and relates to the technical field of energy storage cables. The compression-resistant and torsion-resistant energy storage cable sequentially comprises a cable core, an insulating layer, a lubricating shielding layer and a compression-resistant outer protective layer from inside to outside, wherein the compression-resistant outer protective layer at least comprises the following raw materials in parts by mass: 70-90 parts of high-density polyethylene; 10 to 20 parts of low density polyethylene; 20 to 30 parts of elastic particles; 30 to 40 parts of an ethylene-vinyl acetate copolymer; 30 to 40 parts of a flame retardant; 5 to 10 parts of maleic anhydride grafted poly ethylene propylene diene monomer; 0.1 to 1 part of an antioxidant; 1-2 parts of a lubricant; 0.1 to 1 part of a cross-linking agent; and 0.1-1 part of an assistant cross-linking agent. The anti-compression and anti-torsion energy storage cable prepared by the invention has excellent mechanical performance and electrical performance, and the anti-compression and anti-torsion performance of the energy storage cable is improved.

The invention discloses electromagnetic shielding aerogel with a double-layer structure and a preparation method of the electromagnetic shielding aerogel, the electromagnetic shielding aerogel is composed of cellulose nanofibers, hollow cobalt nickel carbon nanocages and few-layer MXene, and the electromagnetic shielding aerogel is of the double-layer structure. The electromagnetic shielding aerogel not only has excellent kilomegahertz shielding efficiency with low reflection characteristic, but also has great application potential in the fields of lightweight multifunctional electromagnetic shielding composite materials, special electromagnetic protection facilities, electromagnetic stealth materials, severe environment resistant electronic equipment and the like.

The invention discloses a super-hydrophobic polyimide-based anti-corrosion and anti-fouling self-cleaning coating and a preparation method thereof, and belongs to the technical field of organic anti-corrosion coatings, the preparation method comprises the following steps: firstly, preparing GO modified by at least one of POSS, a silane coupling agent, chain alkylamine and chain alkyl isocyanate; then compounding bottom layer slurry, coating the surface of a base material with the composite bottom layer slurry, and carrying out thermal imidization treatment to obtain a composite bottom layer; finally, the surface of the composite bottom layer is coated with modified SiO2 containing alkane siloxane or perfluorosiloxane and a binding agent, and the super-hydrophobic polyimide-based anti-corrosion and anti-fouling self-cleaning coating is prepared. The composite coating is simple in preparation process and high in operability, and has good super-hydrophobic, anti-corrosion and mechanical properties.

The invention relates to the technical field of cable manufacturing, in particular to a superconducting coaxial cable for a quantum computer and a manufacturing method thereof, and the method comprises the steps: coating an inner conductor with an inner insulating layer to form an inner conductor layer, and electroplating a niobium compound coating on the inner wall of a stainless steel tube to form an outer conductor; forming a cable conductive layer; acquiring an advancing speed change curve of a single inner conductor layer; determining a first velocity mutation type and a second velocity mutation type; determining the vertical stirring speed of the electroplating stirring rod at the position of the outer conductor; electroplating the inner wall of the stainless steel pipe; according to the friction degree of the inner conductor layer and the outer conductor, determining an inner conductor motion adjusting mode, including adjusting the moving speed of the inner conductor layer in the outer conductor, or determining the initial rotating speed of the inner conductor layer when the outer conductor starts to pull a wire; and performing wire drawing on the sleeved outer conductor to form the cable. According to the invention, the stability of cable assembly is improved.

The invention provides nickel-carbon conductive shielding foam. The nickel-carbon conductive shielding foam sequentially comprises a conductive layer, foam, a bonding layer and an isolating layer from top to bottom, the foam comprises 25 to 40 parts of nickel-carbon nanotube-cerium oxide composite powder, 1 to 5 parts of an ionic liquid dispersant, 10 to 25 parts of organic silicone oil, 20 to 40 parts of silicone rubber, 5 to 10 parts of polyfuran, 5 to 10 parts of maleimide, 0.5 to 3 parts of a silane coupling agent, 0.01 to 0.1 part of a platinum catalyst and 0.2 to 1.5 parts of a cross-linking agent. The conductive foam can effectively restrain high-frequency electromagnetic interference generated in modern electronic equipment and ensure normal work of the equipment. A self-repairing system is constructed by adding polyfuran and maleimide. When the foam generates cracks under the action of mechanical stress or thermal cycle in the using process, the self-repairing material can automatically repair a conductive network through a reverse Diels-Alder reaction, and the shielding performance and the conductivity of the material are recovered.

The invention discloses an epoxy metal primer as well as a preparation method and application thereof, the epoxy metal primer is applied to a rust removal and rust prevention coating and coating system, the epoxy metal primer has remarkable salt fog resistance, adhesive force and weather resistance, a zinc phosphate and aluminum triphosphate composite rust prevention pigment, a modified epoxy emulsion and a high-density barium sulfate filler are adopted, the coating has excellent shielding performance, and the service life of the coating is prolonged. Corrosive media can be effectively blocked, and the salt spray resistance time is remarkably prolonged; meanwhile, the modified polysiloxane defoaming agent, the wetting leveling agent, the optimized curing agent and the optimized flash-rust inhibitor are adopted, so that the binding force between the coating and various metal substrates is enhanced, and the integrity of the coating is kept under the conditions of long-term mechanical shock, thermal cycle and damp heat. The coating is suitable for various construction conditions, simple and convenient to operate, compact and flat in coating film and capable of being widely applied to the fields of bridges, ships, petrochemical equipment and the like, the service life of a metal structure is remarkably prolonged, and maintenance and replacement cost is reduced.

The invention belongs to the technical field of distribution line hot-line work, and particularly discloses an electromagnetic protection device and method suitable for a 10KV distribution line hot-line work mechanical arm, the electromagnetic protection device comprises an anti-electromagnetic main control box, an insulation mechanical arm and a tail end tool protection assembly, the anti-electromagnetic main control box comprises a shell and a protection layer, and a main control board is arranged in the shell; the protective layer is arranged on the inner surface of the shell and is used for performing double-layer electromagnetic shielding on the main control board; the tail end tool protection assembly is arranged at one end of the insulating mechanical arm, a control panel in the tail end tool protection assembly is used for receiving a control signal from the main control panel and transmitting the control signal to the motor driving board through an optical fiber, and the motor driving board emits a driving signal to drive a motor to act so as to operate a wire; the power supply module is used for separately supplying power to the control board and the motor driving board. Software shielding and hardware shielding are considered at the same time, the anti-electromagnetic interference capacity of the hot-line work mechanical arm can be improved, and the service life of equipment is prolonged.

The invention discloses a photonic crystal hydrogel-based thermochromic intelligent window material as well as a preparation method and application thereof. The photonic crystal hydrogel-based thermochromic intelligent window material is obtained by filling a three-dimensional photonic crystal structure with a temperature-sensitive hydrogel prepolymerization solution and then curing the three-dimensional photonic crystal structure; the preparation method comprises the following steps: adding a temperature-sensitive monomer, modified cellulose and a cross-linking agent into deionized water, carrying out ultrasonic dispersion, stirring under an ice bath condition until the materials are completely dissolved, adding an initiator, stirring until the materials are dissolved, adding N, N, N ', N'-tetramethylethylenediamine, and uniformly stirring to obtain the temperature-sensitive hydrogel prepolymer. The photonic crystal hydrogel-based thermochromic intelligent window material prepared by the invention can regulate and control the window transmittance in real time according to the environment temperature, and has a sensitive thermochromic effect and excellent infrared shielding performance.

The invention discloses a high-performance water-based polyimide / carbon nanotube composite electromagnetic shielding film and a preparation method thereof. The preparation method comprises the following steps: reacting a first mixed reaction system containing a diamine monomer, a salt-forming reagent and a dianhydride monomer to obtain water-based polyamide acid salt; uniformly mixing the polyvinylpyrrolidone modified carbon nanotube aqueous dispersion liquid with the aqueous polyamide acid salt to form an aqueous polyamide acid salt / carbon nanotube dispersion liquid; and applying the water-based polyamide acid salt / carbon nanotube dispersion liquid to a substrate, and then carrying out thermal imidization treatment to prepare the high-performance water-based polyimide / carbon nanotube composite electromagnetic shielding film. The preparation method provided by the invention is simple, safe and environment-friendly, and is suitable for industrial popularization and application, and the finally prepared composite film can still maintain good mechanical properties and high-temperature electromagnetic shielding performance under the condition of high carbon nanotube content, and is beneficial to application in extreme environments.

The invention relates to a preparation method and application of shape memory organic hydrogel with heterogeneous phase change, and belongs to the technical field of material scientificity, the organic hydrogel is prepared through a one-step emulsion thermal polymerization method, and the organic hydrogel not only shows remarkable stretchability under the phase change exceeding 1100%, but also has good shape memory performance under the phase change exceeding 1100%. The prepared electromagnetic shielding material has the advantages of excellent mechanical property, excellent stability, excellent thermal mechanical property, excellent recoverability, good shape memory effect, excellent electromagnetic absorption capability and electromagnetic shielding performance with absorption as a main component.

The invention relates to the technical field of metal ceramic composite materials for small reactors, in particular to a novel WC-based metal ceramic composite shielding material and a preparation process thereof.The composite shielding material is prepared from WC-based ceramic powder and high-entropy alloy powder through ball-milling mixing, pre-pressing forming and high-temperature and high-pressure sintering treatment; the mass ratio of the high-entropy alloy powder in the composite shielding material is 2%-10%. The high-purity WC-based ceramic and the high-entropy alloy are compounded through the steps of ball-milling mixing, pre-pressing treatment, high-temperature and high-pressure sintering and the like, the composite material with unique performance is formed, the uniformity and compactness of the material are ensured, the plasticity of the composite material is improved, the good ductility of the composite material is kept at the high temperature, the atomic diffusivity is reduced, and the mechanical property of the composite material is improved. The high-temperature stability of the material is improved, the high-entropy alloy can form a stable passive film on the surface, the corrosion resistance is further improved, and the comprehensive performance of the material is integrally improved.

The invention relates to the technical field of corrosion prevention, and discloses thiourea-graphene grafted chitosan modified polyurethane resin, a graphene material can form a corresponding physical barrier layer between a metal substrate and an active graft, the coating defect of a polyurethane coating is filled, a corresponding protective film is formed, and the corrosion resistance of the coating is improved. The graphene material has excellent wear resistance and mechanical properties, lone pair electrons provided by amino and hydroxyl on chitosan and sulfur atoms and nitrogen atoms contained in thiourea can also provide lone pair electrons to adsorb metal, water and dissolved oxygen are prevented from diffusing inwards after film forming, the metal is protected, thiourea is grafted to chitosan, and the metal is protected. According to the present invention, the active adsorption center of the chitosan is increased, the graphene is grafted to the chitosan so as to avoid agglomeration, and after the graphene is compounded with the matrix polyurethane, the graphene can uniformly cover the metal substrate to form the compact protective film coating, such that the obtained coating material has excellent metal corrosion resistance.

The invention relates to a preparation method of a BOPET (Biaxially Oriented Polyethylene Terephthalate) film with flame retardant property and electromagnetic shielding property. The preparation method comprises the following steps: S1, carrying out corona treatment on the BOPET film; s2, preparing a dispersion liquid containing an acidified conductive carbon nanomaterial and aramid nanofibers with carboxyl groups on the surface; and S3, dipping the BOPET film treated in the step S1 into the dispersion liquid, then taking out the BOPET film and drying the BOPET film, and completing multiple times of dipping-drying treatment to obtain the BOPET film with the flame retardant property and the electromagnetic shielding property. According to the invention, chemical bond connection is formed between the coating and the substrate film through chemical treatment, and meanwhile, relatively strong interaction is also formed between the coatings, so that the coating can be effectively adsorbed on the surface of the BOPET film, and BOPET is endowed with good flame retardant property and electromagnetic shielding property.

The invention provides a semiconductor power device and a preparation method thereof. The semiconductor power device comprises a semiconductor substrate layer; a drift layer on the semiconductor substrate layer; the gate structure is located in the drift layer and extends in the first direction; the well regions are located in the drift layer on the two sides of the gate structure in the second direction, and the second direction is perpendicular to the first direction; the first doped region and the second doped region are located in the drift layer on one side, facing the semiconductor substrate layer, of the well region and are arranged at intervals in the second direction, the conduction type of the first doped region is the same as that of the drift layer and opposite to that of the second doped region, and the doping concentration of the first doped region is larger than that of the drift layer; the first doped region surrounds the side wall and part of the bottom wall of one side of the gate structure along the second direction, the second doped region surrounds the side wall and part of the bottom wall of the other side of the gate structure along the second direction, and the first doped region and the second doped region are spaced from the well region.

The invention discloses a semiconductor device and a preparation method thereof. The semiconductor device comprises a substrate, an epitaxial layer, a gate structure and a buried layer structure, the substrate has a first conduction type, the epitaxial layer has the first conduction type and is located on the surface of the substrate, the epitaxial layer comprises a first surface, and the first surface is provided with a gate trench; the gate structure is located in the gate trench; the buried layer structure comprises a first buried layer and a second buried layer, the second buried layer has a first conductive type, the first buried layer has a second conductive type, the ion concentration of the second buried layer is greater than that of the epitaxial layer, and the second buried layer is configured to reduce the width of a depletion region between the second buried layer and the first buried layer. According to the technical scheme of the embodiment of the invention, the gate oxide layer can be protected from being broken down easily, the reliability of the device is improved, and the on-state current of the device is ensured.

The invention provides an ultra-high-speed electric connector which comprises an insulating body, the insulating body is provided with a lengthwise slot, a plurality of terminal slots are formed in lengthwise side walls on the two sides of the slot respectively, and a fool-proof part is arranged in the slot and used for dividing the insulating body into a power supply and low-speed signal area and a high-speed signal area which are located on the two sides of the fool-proof part; the plurality of terminals comprise differential signal terminals distributed in the high-speed signal area and other terminals distributed in the high-speed signal area and the power supply and low-speed signal area, every two differential signal terminals are adjacent, and two sides of every two adjacent differential signal terminals are respectively provided with a grounding terminal; every two adjacent differential signal terminals and two grounding terminals located on the two sides of the two differential signal terminals form a terminal module, and the two differential signal terminals and the two grounding terminals of each terminal module and an insulating block inserted into the insulating body are formed in an embedded mode. The ultra-high-speed electric connector can enable signal transmission to be better and more stable.

The utility model relates to the technical field of radiation cables, in particular to an anti-nuclear radiation cable, which comprises a wire core, an inner insulating layer is fixedly connected to the outer surface of the wire core, a low-smoke halogen-free flame-retardant insulating material is fixedly connected inside the inner insulating layer, and a first shielding layer assembly is fixedly connected to the outer surface of the inner insulating layer. When the anti-nuclear radiation cable is used, the surface of the second core insulating layer is connected with the first anti-radiation layer, the first anti-radiation layer is composed of the lead-based alloy foil, and lead is a metal with large density and high atomic number, so that nuclear radiation can be effectively absorbed and blocked; a barrier is formed through the high-density characteristic of the lead-based alloy foil, penetration of radiation to the internal structure of the cable is remarkably reduced, the surface of the insulating layer is connected with the second anti-radiation layer, and the second anti-radiation layer is composed of a film, so that the nuclear radiation shielding capability of the cable is further enhanced, and the effect of resisting intense radiation is achieved.

The invention belongs to the technical field of electromagnetic shielding materials and conductive composite fabrics, and particularly relates to an EMI shielding fabric and a preparation method thereof. Firstly, a layer of PDDA solution with positive charges is adsorbed on the surface of the fabric, then the fabric with the positive charges is soaked in ANF dispersion liquid prepared in advance, and the stable high-temperature-resistant fabric adsorbing the ANFs is prepared; the preparation method comprises the following steps: firstly, preparing a high-temperature-resistant fabric, then pretreating the high-temperature-resistant fabric through ultrasonic treatment, activating a fiber membrane through sodium borohydride solution treatment, and chemically plating nickel on the surface of the high-temperature-resistant fabric adsorbing ANFs through a palladium-free chemical plating process, so that the prepared high-temperature-resistant flexible fabric has excellent flexibility, heat resistance, corrosion resistance and efficient shielding effect; the method is easy to operate, economical and environmentally friendly, the porous structure of the formed flexible conductive high-temperature-resistant EMI shielding fabric and the nickel coating on the surface enable the material to have excellent electromagnetic shielding performance, and the problem of mutual interference between electronic elements can be solved.

The invention belongs to the technical field of metal materials and radiation protection, and particularly relates to a preparation method of thermal neutron shielding steel. According to the method, efficient spray forming of the B4C / 304 stainless steel composite material is achieved through a gas-solid two-phase flow driving mechanism under the negative pressure environment, B4C ceramic particles are evenly dispersed and embedded into a 304 stainless steel matrix, and due to the strong driving force of gas-solid two-phase flow, firm interface bonding is formed between the B4C particles and the matrix. According to the process, gas atomization and solid-phase medium particles are combined, a gas-solid two-phase mixed flow is formed, the atomization efficiency is greatly improved, the powder particle size is refined, reinforced phase distribution is optimized, and a new way is opened up for preparation of the high-performance thermal neutron shielding steel composite material.

The utility model discloses an outer conductor and a coaxial connector, comprising a plugging section which is in plugging cooperation with the outer conductor of a mating connector, a wiring section which is used for connecting a coaxial cable, and a clamping section which is arranged between the plugging section and the wiring section. According to the utility model, the connection area of the periphery of the plugging section of the outer conductor and the side surface of the clamping groove forms the fillet structure, and the fillet structure is located at the side surface of the clamping groove and is stamped from inside to outside to form the plurality of bumps arranged along the circumferential direction of the plugging section, so that the front and back stop of the terminal assembly is realized through the arrangement of the bumps; compared with the outer conductor formed by direct stamping, the matching effect and stability of the outer conductor and the TPA piece are better; in addition, compared with an existing scheme that front stopping is achieved through a piercing structure, the shielding effect is better.