20results about How to "High shielding efficiency" patented technology

The invention relates to the field of shielding materials, and provides lead-free rubber with ionizing radiation shielding performance and a preparation method thereof, and the lead-free rubber is mainly prepared from barium titanate / boron nitride composite filler, barium tungstate / boron carbide composite filler, tungsten powder, bismuth powder, a rubber matrix and an auxiliary agent according to a proportion. The barium titanate particles are uniformly loaded on the surface of the flaky boron nitride, so that the gamma ray and X ray shielding performance is improved, and meanwhile, the boron nitride provides excellent neutron shielding capability; barium tungstate particles are loaded on the surfaces of the boron carbide nanowires to form a multi-scale shielding network, and the shielding effect of neutrons and ionizing radiation is remarkably enhanced. The rubber matrix endows the material with excellent flexibility and mechanical properties. By scientifically optimizing the component proportion and the preparation process, the problems that a traditional high-density shielding material is prone to agglomeration, poor in flexibility and the like are solved, and the material shows excellent performance in the fields of gamma ray, X ray and neutron shielding and is suitable for the fields of nuclear energy, medical protection, industrial radiation protection and the like.

The invention discloses a neutron and gamma ray integrated aluminum-based nuclear shielding material. The aluminum-based nuclear shielding material comprises, by mass, 1%-10% of boron carbide, 5%-30% of high-entropy alloy powder and 60%-94% of aluminum alloy powder. The invention further discloses a preparation method of the aluminum-based nuclear shielding material. The preparation method comprises the steps that firstly, boron carbide, high-entropy alloy powder and aluminum alloy powder are mixed and then subjected to ball milling; step 2, crushing; 3, cold pressing and hot pressing sintering; and 4, hot rolling and solid solution aging heat treatment. According to the neutron and gamma ray integrated aluminum-based nuclear shielding material, the gamma ray shielding efficiency and the mechanical property of the aluminum-based nuclear shielding material are improved by introducing the high-entropy alloy powder, the neutron and gamma ray integrated aluminum-based nuclear shielding material high in shielding efficiency and excellent in comprehensive mechanical property is obtained, and the neutron and gamma ray integrated aluminum-based nuclear shielding material is suitable for the technical fields of small reactors, movable reactors, nuclear submarines and the like.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The present invention discloses a neutron and gamma ray integrated aluminum-based nuclear shielding material, which includes the following components in mass percentage: 1% to 10% boron carbide, 5% to 30% high entropy alloy powder, and 60% to 94% aluminum alloy powder; the present invention also discloses a method for preparing the aluminum-based nuclear shielding material: step 1, mixing boron carbide, high entropy alloy powder and aluminum alloy powder and then ball milling; step 2, crushing; step 3, cold pressing and hot pressing sintering; step 4, hot rolling and solid solution aging heat treatment. The present invention introduces high entropy alloy powder to improve the gamma ray shielding efficiency and mechanical properties of the aluminum-based nuclear shielding material, thereby obtaining a neutron and gamma ray integrated aluminum-based nuclear shielding material with high shielding efficiency and excellent comprehensive mechanical properties, which is suitable for technical fields such as small reactors, mobile reactors and nuclear submarines.

The invention provides a multi-ray comprehensive shielding composite material design method. According to the invention, on the basis of a neutron and gamma ray shielding physical process, equivalent energy and equivalent intensity of three types of neutron rays and gamma rays in a radioactive source are calculated respectively, and the required amount of shielding components corresponding to each shielding step of each ray is calculated according to the equivalent energy and the equivalent intensity; and finally, arranging the component distribution of the multi-ray comprehensive shielding composite material according to the function of each shielding component. According to the method, the distribution of the shielding components in the matrix is regulated and controlled, so that the shielding components can participate in different rays and different shielding processes, and the thickness of the shielding material is reduced on the premise of ensuring good overall shielding performance of the material.

The utility model provides plasma processing equipment which comprises a plasma processing chamber and a magnetic isolation shielding cover, the magnetic isolation shielding cover comprises a hollow cylindrical structure, and the cylindrical structure is arranged outside the plasma processing chamber in a covering mode and is attached to the outer wall of the plasma processing chamber. The cylindrical structure is arranged in the plasma processing chamber so as to isolate interference of an external magnetic field to plasma in the plasma processing chamber, and the height of the cylindrical structure is larger than that of the plasma processing chamber. According to the utility model, the interference of an external magnetic field on plasmas in the plasma processing chamber can be isolated, so that the stability of the magnetic field in the plasma processing chamber is ensured, and the non-uniform distribution of the plasmas in the plasma processing chamber caused by the interference of the external magnetic field on the magnetic field in the plasma processing chamber is avoided; and the wafer processing uniformity and reproducibility can be improved.

The invention provides an X-ray composite radiation shielding material and a preparation method and application thereof, and belongs to the technical field of radiation protection. The photoelectric effect and the scattering effect of X-rays in the material are remarkably enhanced by using high atomic number elements contained in the metal oxide, so that the transmittance of the X-rays is effectively reduced. Meanwhile, the oxide material has good chemical stability and environmental friendliness, and the toxicity and aging problems caused by a traditional lead-based shielding material can be avoided. The prepared composite radiation shielding material has the advantages of being low in cost, light in weight, easy to process, good in flexibility, non-toxic, environmentally friendly and the like, the shielding efficiency of an X-ray shielding coating reaches up to 70% or above when the X-ray photon energy is 70 kV or below, and the generated secondary reflectance can be reduced by 35-80% compared with lead.

The invention discloses a high-temperature-resistant TaB2 reinforced yttrium-based composite material for nuclear shielding as well as a preparation method and application of the TaB2 reinforced yttrium-based composite material. The yttrium-based alloy material comprises the following components in percentage by mass: 0.5-25.0% of Ta, 0.1-3.0% of B, and the balance of yttrium and inevitable impurities, wherein Ta / B is more than or equal to 8.0 and less than or equal to 8.5. The high-temperature-resistant yttrium-based alloy composite material plate integrating neutron moderation absorption and gamma-ray shielding is finally prepared through the processes of burdening, melting through a special process, casting molding, hot forging or hot pressing, hot rolling, cold rolling, annealing and hydrogenation, and finally the high-temperature-resistant yttrium-based alloy composite material plate integrating neutron moderation absorption and gamma-ray shielding is prepared. According to the invention, the grain size of the yttrium-based alloy is effectively reduced through alloying, the hydrogen induced cracking resistance, hot workability and neutron and gamma ray shielding capability of the yttrium-based alloy are improved, and the shielding lightweight design of a micro nuclear reactor can be realized.

The invention relates to the technical field of petroleum and natural gas drilling, in particular to a double-source rod shielding device and a loading and unloading method, and the device comprises a neutron source tank, a source rod, a gamma source tank and a double-source rod; the neutron source tank and the gamma source tank are oppositely connected, communicating holes are coaxially formed in the neutron source tank and the gamma source tank, the two ends of the source rod extend into inlets of the communicating holes of the neutron source tank and the gamma source tank respectively, the double-source rod is arranged in the source rod, one end of the double-source rod is provided with a neutron source, and the other end of the double-source rod is provided with a gamma source; the end, provided with the neutron source, of the double-source rod extends into an inlet of the communicating hole of the neutron source tank in the source rod, the end, provided with the gamma source, of the double-source rod extends into an inlet of the communicating hole of the gamma source tank in the source rod, and a fishing head is arranged at the end, provided with the neutron source, of the double-source rod. A neutron source plug is arranged at the outlet of the communicating hole of the neutron source tank, and a gamma source plug is arranged at the outlet of the communicating hole of the gamma source tank; and the neutron source tank and the gamma source tank are filled with shielding materials, so that the double-source rod can be effectively shielded.

The utility model relates to the technical field of electromagnetic shielding materials, and provides a bondable electromagnetic shielding composite foam board and a navigation model. The bondable electromagnetic shielding composite foam board comprises a release paper layer, an epoxy resin layer and a polyurethane foam shielding layer, and the polyurethane foam shielding layer is made by a foaming technology; wherein the epoxy resin layer is clamped between the polyurethane foam shielding layer and the release paper layer, and the release paper layer is attached to the lower surface of the epoxy resin layer. According to the bondable electromagnetic shielding composite foam board and the navigation model, the density of the material can be further reduced by adopting the foaming polyurethane and introducing the foam holes, the shielding performance is improved through multiple reflection and absorption of the foam holes to electromagnetic waves, and the potential application field of the electromagnetic shielding material is widened.

The invention relates to a breakdown-resistant and aging-resistant power cable. A power cable has high anti-breakdown and anti-aging requirements, however, cable materials used at present, such as polyethylene, are poor in anti-aging capability. In order to solve the problem, the breakdown-resistant and aging-resistant power cable is invented, the breakdown-resistant and aging-resistant power cable is sequentially composed of a conductor, a conductor shielding layer, an insulating layer, a wrapping layer and a protective layer from inside to outside, and the conductor shielding layer is a composite shielding material composed of organic silicon, graphene and nano molybdenum dioxide. The organic silicon in the conductor shielding layer has good heat resistance and aging resistance; the graphene has good electric conduction and heat conduction performance, can shield electromagnetic waves, and can conduct heat out to reduce the temperature; the nano molybdenum dioxide can react with peroxide at high temperature, so that the degradation effect of the organic silicon resin is delayed, and the aging resistance of the cable can be effectively improved by combining the nano molybdenum dioxide, the peroxide and the organic silicon resin. The breakdown-resistant and aging-resistant power cable can be used in the fields of high-voltage power cables and the like.

The utility model relates to a cable, and specifically relates to a dynamic network Category 6 cable for a mechanical arm. The utility model aims to provide the dynamic network category 6 + cable for the mechanical arm, and the cable still has the advantages of low attenuation, high transmission rate and high-frequency support under the working condition of high-intensity movement, and has the characteristics of high flexibility, torsion resistance, tensile resistance and stable signal transmission. According to the technical scheme, the dynamic network Category 6 + cable for the mechanical arm is characterized by comprising a cable core, and an outer shielding layer, a belting layer and an outer protection layer which are sequentially coated outside the cable core from inside to outside, the cable core comprises a plurality of twisted pairs which are arranged in parallel along the length direction of the cable and are coated with inner shielding layers; the twisted pair wires adopt different twist pitches so as to reduce electromagnetic crosstalk between the twisted pair wires. The twisted pair wire comprises two twisted wires, and each wire comprises a conductor, and a first insulating layer, a second insulating layer and a third insulating layer which are sequentially coated on the conductor from inside to outside.

The application discloses an electrical equipment and belongs to the technical field of electrical equipment. The electrical equipment comprises a circuit board, a cover body, a first conductive piece group and a second conductive piece group, the circuit board is provided with a device to be shielded; the cover body is covered outside the device to be shielded; the first conductive piece group is arranged on the circuit board and located outside the cover body, the first conductive piece group comprises a plurality of first conductive pieces which are spaced apart; the second conductive piece group is arranged on the circuit board and located inside the cover body, the second conductive piece group comprises a plurality of second conductive pieces which are spaced apart, and the first conductive pieces and the second conductive pieces are staggered. By arranging the first conductive pieces and the second conductive pieces which are staggered on the outside and the inside of the cover body respectively, the shielding effect can be enhanced, and the manufacturing and maintenance costs can be reduced.

The invention belongs to the technical field of nuclear magnetic resonance logging, and discloses a nuclear magnetic resonance logging instrument probe. Comprising a center support, a magnet assembly, a magnet protection shell, a magnetic core assembly and a magnetic core protection shell. The central support is provided with a mounting shaft and radial limiting parts at two ends. The magnet assembly is mounted on the mounting shaft, is positioned between the two limiting parts, comprises a first semi-cylinder group formed by splicing a plurality of small magnets on the upper side and a second semi-cylinder group formed by splicing a plurality of large magnets on the lower side, and is used for generating a radially enhanced static magnetic field. And the magnet protection shell is formed by buckling an upper shell and a lower shell which respectively cover the first semi-cylinder group and the second semi-cylinder group. The arc-shaped magnetic core assembly is attached to the periphery of the upper shell to guide a magnetic circuit and enhance a radio frequency magnetic field, and the outer side of the arc-shaped magnetic core assembly is coated with a magnetic core protection shell connected with the magnet protection shell. The magnetizing directions of the large and small magnets are tangentially arranged along the circumference of the probe; and the lower shell is made of a magnetic conductive material to form a magnetic shielding structure for shielding a stray magnetic field at the bottom. The probe can significantly increase the detection distance.

The utility model belongs to the technical field of beam limiting devices, and particularly relates to a shielding assembly for a speed limiter and an adjustable shielding device. The fixed lead window comprises a fixed bracket and a rounded rectangular lead window, and a rectangular opening is formed in the lead window; the aperture adjusting part comprises a base and a pressing ring, an annular groove is formed in the base, a rotatable rotating disc is arranged in the annular groove, the pressing ring is used for abutting the rotating disc into the annular groove, a plurality of radial sliding grooves are formed in the rotating disc, and a plurality of shielding blades stacked layer by layer are arranged between the rotating disc and the base. The upper ends and the lower ends of the shielding blades are hinged to the rotating disc and the base through upper pin shafts and lower pin shafts respectively, the upper pin shafts are slidably installed in the radial sliding grooves, the rotating disc is rotated so that the upper pin shafts can slide in the radial sliding grooves in the direction close to or away from the center of the rotating disc, and the upper ends of the shielding blades are driven to be close to or away from each other. The shielding range of the shielding blade is adjusted; the shielding efficiency, the shielding utilization rate and the imaging quality of the beam limiting device are improved.

The utility model discloses a flexible combination cable for a mobile system, which comprises two signal core wires and two control core wires, the signal core wires and the control core wires are twisted into a cable, the center and the outer side of the cable are filled with filling ropes, the signal core wires and the control core wires of the cable are wrapped by a wrapping tape, and a sheath is extruded on the wrapping tape; each signal core wire comprises a signal conductor, the signal conductor is formed by twisting a plurality of Category 6 + copper wires of phi 0.05 mm, a signal insulating layer is extruded on the signal conductor, a winding shielding layer is wound on the signal insulating layer, and the winding directions of the winding shielding layers in the two signal units are opposite; the control core wire comprises a control conductor, the control conductor is formed by twisting a plurality of Category 6 + copper wires of phi 0.05 mm, and a control insulating layer is extruded on the control conductor; the twisting direction of the signal conductors, the twisting direction of the control conductors and the twisting direction during cabling are consistent. The flexible cable is not only good in flexibility, but also excellent in electrical performance.

The present invention discloses a microwave shielding door assembly and a microwave cooking appliance, the microwave shielding door assembly comprising: a door body; a door panel provided on the door body, and an incisor structure provided on the outer periphery of the door panel; a door frame provided on the cavity of the cooking appliance; the incisor structure comprising at least three layers of incisors provided along the thickness direction of the door panel; the door frame is adapted to the outer edge structure of the incisors. The microwave cooking appliance is provided with the above-mentioned microwave shielding door assembly. In the microwave shielding door assembly of the present invention, more than two layers of incisors are provided on the outer periphery of the door panel, which can increase the microwave impedance effect, weaken reflected waves and standing waves, increase the power capacity of microwave transmission, reduce focusing phenomenon, and improve the efficiency of microwave shielding; the door frame of the cavity is adapted to the outer edge structure of the incisors, which can effectively reduce microwave leakage.

A zirconium hydride-based moderation shielding material containing gadolinium oxide / samarium oxide / europium oxide, its preparation method, and its application belong to the field of radiation shielding technology. It solves the problems of hydrogen loss, cracking, and poor thermal stability inherent in existing zirconium hydride materials. The material of this invention has a density of 5.58–5.71 g / cm³. 3 The hydrogen content is 1.6wt%~1.83wt%. The mass proportions of each substance in the total amount of ZrH2, Gd2O3, Sm2O3 and Eu2O3 are: 99%≤ZrH2<100%, 0%≤Gd2O3≤1%, 0%≤Sm2O3≤1%, 0%≤Eu2O3≤1%, 0%<Gd2O3+Sm2O3+Eu2O3≤1%. The hydrogen release initiation temperature is ≥557℃. Utilizing multi-element synergistic absorption, the shielding efficiency for 1MeV fast neutrons is ≥97.5%, and the thermal neutron proportion is reduced by ≥80%. It is suitable for small nuclear power reactors below 600℃.

The utility model discloses a magnetic shielding structure which is applied to the field of chip packaging. According to the utility model, the four inclined diamagnetic side walls which are mutually connected and the diamagnetic cover plate which is integrally connected with the four diamagnetic side walls are arranged at the periphery of the diamagnetic gasket, and the substrate, the diamagnetic gasket, the four inclined diamagnetic side walls and the diamagnetic cover plate form a closed space, so that a static magnetic field of a magnetic chip placed in the closed space is shielded; due to the fact that the four diamagnetic side walls which are mutually connected in the circumferential direction are adopted, magnetic fields in all directions of the magnetic chip can be shielded, and the magnetic shielding efficiency is greatly improved; and the inclined side wall is adopted, so that the shielding efficiency can be effectively improved, the vertical shielding effect can be greatly improved, and the horizontal shielding effect can be maintained at the same time. Meanwhile, the magnetic chip is connected with the substrate in the hollow area of the diamagnetic gasket by adopting a flip-chip bonding scheme, so that the problem that lead bonding cannot be carried out due to more side walls is solved.