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58 results about "Critical magnetic field" patented technology
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Superconductor connection structure
InactiveUS6921865B2Reduce power consumptionSimple connection structureSuperconductors/hyperconductorsSuperconductor detailsElectricityElectrical connection
Electrical connection of superconducting lines can be achieved by using a low-melting point metal, by mechanical contact of superconducting lines or by welding. According to these methods, however, critical current and critical magnetic field at the connection point are low, and stable connection in a superconducting state has been difficult. The present invention solves these problems and provides a structure and method for connecting superconducting lines. The present invention provides high-performance, high-stability connection of superconducting lines through magnesium diboride (MgB2) powder arranged between superconducting lines.
Owner:HITACHI LTD
Samarium and cobalt sintered permanent magnet material and preparation method thereof
ActiveCN104637642ASpeed up coolingIntegrity guaranteedInorganic material magnetismCobaltCritical magnetic field
A samarium and cobalt sintered permanent magnet material comprises, in weight percent, 25-27%wt of samarium, 49-51%wt of cobalt, 5-6.5%wt of copper, 3-3.5%wt of zirconium and 15-18%wt of iron. A preparation method includes the steps: smelting; casting an ingot; absorbing hydrogen for the cast ingot; making powder; performing orientation forming and sintering. In the smelting process, the thickness of a casting mould cavity is decreased, cooling water is filled into the wall of the mould cavity, cooling of the cast ingot is accelerated, element composition segregation is decreased, the production process is stabilized, a dendrite crystal is restrained by adding a zirconium element, hydrogen absorbing is performed for the cast ingot in the smelting process, production steps are saved, and energy consumption is reduced. In the subsequent milling process, the cast ingot absorbed hydrogen is crystallized into particles, the particles fracture along crystal boundaries in the milling process of airflow, the integrality of crystal particles is ensured, the anisotropy of the crystal particles is improved, magnetic powder particles are obtained, particle size distribution is concentrated with the range of 3.5-4.5 micrometers, the sintering temperature needed by the magnetic powder particle of each point of a blank is the same in the later sintering process, the sizes of the sintered crystal particles are the same and uniform, and the performances, particularly, such as residual magnetism Br, maximum magnetic energy product (BH) max and critical magnetic field Hk of a sintered permanent magnet are improved.
Owner:NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
Cable-in-conduit conductor based on ReBCO isotropic superconducting strands
InactiveCN107564623AThe critical current is isotropic and goodIncrease operating temperatureSuperconductors/hyperconductorsSuperconductor devicesElectrical conductorHigh energy
The invention belongs to the field of superconducting electrical technology, and particularly relates to a cable-in-conduit conductor based on ReBCO isotropic superconducting strands. In view of the disadvantages of the existing cable-in-conduit conductor prepared from a low-temperature superconductor, such as low critical current density, low critical magnetic field intensity, low operating temperature, small temperature field and poor mechanical property, the invention presents a cable-in-conduit conductor based on ReBCO isotropic superconducting strands. The cable-in-conduit conductor is composed of a center conductor, ReBCO isotropic superconducting strands, a metal sheath, and a cooling channel. The ReBCO isotropic superconducting strands are closely arranged and spirally wound aroundthe center conductor as sub strands. Complete transposition can be realized for the ReBCO isotropic superconducting strands. The cable-in-conduit conductor has the advantages of good critical currentisotropy, high operating temperature, high operating current density, simple production process, suitability for large-scale production, and the like. The application of ReBCO isotropic superconducting strands in nuclear fusion large-scale superconducting magnet coils and other high-energy physical devices is expanded.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
Preparation method iron based SmFeAsO1-xFx superconducting wire
InactiveCN101345103AEvenly distributedIncrease the critical current densitySuperconductors/hyperconductorsSuperconductor devicesCritical magnetic fieldSuperconducting transition temperature
The invention provides a preparation method of an iron-based SmFeAsO<1-x>Fx superconducting wire, comprising the steps as follows: a: material preparation: the material is prepared according to the stoichiometry of the iron-based superconducting material SmFeAsO<1-x>Fx (wherein, x is not more than 0.35 and not less than 0.15, the raw materials such as SmAs, Fe, Fe2O3 and FeF3 are weighed, grinded, uniformly mixed, arranged into a Tantalum pipe, fully fixed and compacted; the two ends of the Tantalum pipe are sealed; b: wire preparation: the Tantalum pipe is sheathed into a copper pipe and rotatablely forged; subsequently, the wire with the diameter of 1.8-2.2mm is formed by pulling and drawing; c: burning: the wire is arranged in a quartz pipe and sealed in vacuum and then put into a sintering furnace; under the protection of inert gas, the temperature of the wire is increased to 1150-1170 DEG C at the speed of 100-150 DEG C / hour, the temperature is kept for 36-50 hours and the wire is cooled with the furnace. The method of the invention has the advantages of simple technology and facilitating industrial production, and the compactness, high purification, stable superconducting performance, high superconducting conversion temperature and high critical magnetic field of the prepared iron-based SmFeAsO<1-x>Fx superconducting wire.
Owner:SOUTHWEST JIAOTONG UNIV
Perovskite structure-based single-phase iron-based superconductive material and preparation method thereof
InactiveCN101993247AGood superconducting stabilityHigh critical fieldChemical reactionSuperconducting transition temperature
The invention relates to a perovskite structure-based single-phase iron-based superconductive material and a preparation method thereof. The material has a two-dimensional laminar structure, and the composition is shown by the formula of Sr4V2O6Fe2As2. The preparation method of the material comprises the following steps of: preparing a SrAs precursor sample and an FeAs precursor sample; mixing the precursors, Sr0, V2O3, Fe and the like by using a solid-state chemical reaction method; and reacting at a high temperature to directly synthesize a perovskite layer-based iron-based superconductive material. Compared with other known iron-based superconductors, the material has higher bidimensionality. The material has electronic carrier characteristics, carrier concentration of 1,020 to 1,022 / cm<3> and superconductive transformation temperature of about 40K. An upper critical magnetic field of the material at a low temperature is estimated to be greater than 250 teslas, so that the material is probably applied to superconductive power transmission, strong magnetic field generation and the like. In addition, the material can also be used in a superconductive filter and the like. The preparation method is simple.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
Asymmetric type tank bottom bus and current distributing style
ActiveCN1598069ASmall magnetic field gradientReduce magnetic fieldBus-bar installationEngineeringCritical magnetic field
The invention discloses a dissymmetrical bottom generatrix and the current configuration method. The current from the cathode soft generatrix distributes in the electrode in the bottom generatrix and side generatrix centered on the Y axis. The current of bottom generatrix and the side generatrix near the flue (right) is higher than that of the aluminium-outputting terminal. The invention, owing to adopting the dissymmetrical configuration of bottom generatrix and the dissymmetrical configuration of the current, can effectively reduce the magnetic field produced by the electrobath, overcome the influence of the critical magnetic field of the slot, make the magnetic field reach the effects of cutting the peak and filling the flat, reduce the grads of the magnetic field and greatly increase the uniformity of the magnet.
Owner:GUIYANG AL-MG DESIGN & RES INST
Superconducting magnet coil system with quench protection
ActiveUS20080007375A1Easy constructionHigh voltageMagnetic measurementsMagnetsElectrical resistance and conductanceElectrical conductor
A superconducting magnet coil system comprising a main field coil which is formed from series-connected sections, wherein the conductors of the radially inner sections contain a first superconducting material and have first electric voltage insulation, the conductors of the radially outer sections comprise a second superconducting material and are provided with second electric voltage insulation, wherein the first superconducting material has a higher critical magnetic field than the second superconducting material, and the first voltage insulation has a smaller dielectric strength than the second voltage insulation, and a shielding coil which is connected in series with the main field coil, radially surrounds the main field coil, and comprises conductors of the second superconducting material having the second electric voltage insulation, wherein the main field coil and the shielding coil are superconductingly short-circuited during operation and are protected through several ohmic resistances and / or diodes in case of a quench, is characterized in that the inner sections are protected by at least one ohmic resistance and the outer sections are protected, together with the shielding coil, by one single ohmic resistance.
Owner:BRUKER BIOSPIN
Magnetic sensitive material with high sensitivity
InactiveCN101552070AGood value for moneyReduce power consumptionMagnetic materialsSurface layerBias field
The invention relates to a magnetic material, in particular to a magnetic sensitive material with high sensitivity, wherein the magnetic sensitive material contains Fe and the alloy consisting of one or more compositions of Co, B, Si, Nb, V, Mn, Cu, Ni and Cr; the magnetic material is characterized in that the external surface layer is an amorphous shell layer and the inside of the magnetic sensitive material is a composite structure with a nano-crystalline internal core material. The nano-crystalline structure has the advantages of easy magnetization and high permeability in the longitudinal direction and the amorphous structure has the advantages of easy magnetization and high permeability in the ring direction vertical to the longitudinal direction; and the combination of the nano-crystalline structure and the amorphous structure can greatly improve the change rate of impedance and the magnetic field sensitivity, greatly improves the magnetic field sensitivity at a weak magnetic field, has the advantages of low-sensitivity response critical magnetic field (wherein the sensitivity response magnetic field can be less than 5A / m), being sensitive to weak magnetic field without needing a bias field, reducing the power dissipation of a magneto-dependent sensor, low cost, etc., and is a magnetic sensitive material with high cost-performance ratio and high sensitivity.
Owner:ZHEJIANG NORMAL UNIVERSITY
Rapid nondestructive testing method for permanent magnet material-based sub-quality product with poor room-temperature and high-temperature performances
InactiveCN103605089ALow costComprehensive detectionMagnetic property measurementsDemagnetizing fieldRoom temperature
The invention, which belongs to the field of the magnetic functional material nondestructive testing technology, relates to a rapid nondestructive testing method for a permanent magnet material-based sub-quality product with poor room-temperature and high-temperature performances. The method comprises the following steps that: after saturation magnetizing on a permanent magnet material, the magnetized permanent magnet material is heated to a work temperature of the magnet, a demagnetizing field with the strength of 80% to 100% Hk is applied to the magnet for demagnetization, and cooling is carried out; and a room-temperature open-circuit flux of the magnet after the demagnetization is detected and the sample with the measurement value lower than a set testing standard is a sub-quality product. According to the invention, samples with unqualified indicators like residual magnetism Br, an intrinsic coercive force Hcj, a magnetic induction coercive force Hcb, a magnetic energy product (BH)max, and a critical magnetic field strength and the like can be detected comprehensively; and a product with a poor room temperature performance and a product with a poor high temperature performance can be detected. High-temperature demagnetization can be carried out on multiple or even hundreds of samples simultaneously; the measurement of the open-circuit flux can be carried out conveniently; and the method has the characteristics of accuracy, simpleness, rapidity, and low cost and is suitable for application to large-scale production.
Owner:UNIV OF SCI & TECH BEIJING
Superconducting connection between MgB2 superconducting wires via a compressed element made from HTS powder
InactiveUS20100216645A1Simple and inexpensive methodHigh-quality jointSuperconductors/hyperconductorsSuperconductor detailsHigh-temperature superconductivityCritical magnetic field
A method for connecting two or more superconducting wires (1, 2), each comprising at least one filament (3a-3b) that contains MgB2, wherein the superconducting connection is realized through exposed end regions (13) of the filaments (3a-3d) via a superconducting matrix, is characterized in that a bulk powder (4) of a high-temperature superconductor (HTS) powder with a transition temperature of Tc>40K is provided, into which the exposed end regions (13) of the filaments (3a-3d) project, wherein the Boron of the Boron powder of the bulk powder (4) is in amorphous modification, and the bulk powder (4) is compacted together with the projecting exposed end regions (13) of the filaments (3a-3d) to form a compressed element (8). The method improves the quality, in particular, the current carrying capacity and the critical magnetic field strength of a superconducting connection of two MgB2 wires.
Owner:BRUKER EAS
Method for preparing Nb3Al superconducting wire precursor
ActiveCN105304208AReduce AC loss valueSuppress couplingSuperconductors/hyperconductorsSuperconductor devicesIngotSuperconducting transition temperature
The invention discloses a method for preparing an Nb3Al superconducting wire precursor. The method comprises the steps of preparing a single-core composite rod by means of a Nb rod, a Ta-containing foil and a Cu pipe; rolling a prepared single-core composite rod for forming a hexagonal rod with a regular hexagonal cross section; loading a plurality of prepared hexagonal rods into a Cu packaging pipe and sealing, thereby forming a composite blank ingot; preparing a Cu-packaged composite rod from the prepared composite blank ingot through a heat extrusion processing procedure; and preparing an Nb3Al superconducting wire precursor lead through a plurality of drawing processing procedures. The Nb3Al superconducting wire precursor prepared according to the method of the invention has functions of effectively suppressing coupling between superconducting performance core filaments and remarkably reducing AC loss of a final superconducting wire under a precondition that superconducting performances such as superconducting transition temperature, critical current density and upper critical magnetic field are not ensured.
Owner:西部超导材料科技股份有限公司
Preparation method of carbon nano-tube composite material with enhancing characteristics
InactiveCN103395772AHigh tensile modulusHigh mechanical strengthMaterial nanotechnologyCarbon compoundsFiberComposite film
The invention discloses a preparation method of a carbon nano-tube composite material with enhancing characteristics. The composite materials of carbon nano-tubes (CNTs) and a metal carbide include spiral carbon nano-tubes / metal carbide composite fiber and film. According to the composite fiber, carbon nano-tubes are drawn or twisted from a carbon nano-tube array, such that spinning fiber is formed; the spinning fiber is immersed into a metal precursor solution; and the mixture is heated in a reductive gas comprising carbon-source gas, such that the composite material is prepared. Compared with direct-spinning fiber, the carbon nano-tube composite material with enhancing characteristics has the advantages that: the composite has higher tensile strength, conductivity, and tensile modulus; 2, a parallel tape composite structure comprising carbon nano-tube array embedded in an NbC film shows enhanced conductivity and improved superconductivity along a CNT axial direction; 3, enhanced upper critical magnetic field of a NbC / CNT composite film shows that the NbC coherence length is reduced with the CNTs content in the NbC array; and 4, a nano-mechanical test also proofs the potential application of the material in enhancing the fracture toughness of the NbC / CNT composite film.
Owner:常熟苏大低碳应用技术研究院有限公司
Superconductive wire, processes of manufacture and uses thereof
ActiveUS20090186769A1Superconductors/hyperconductorsSoldering apparatusEngineeringCritical magnetic field
An electrical component comprises a superconductive wire, the wire comprising a first wire segment joined to a second wire segment, wherein the first wire segment and the second wire segment differ in at least one property selected from the group consisting of magnetic field tolerance, temperature tolerance, ac loss, and strain tolerance, and wherein the magnetic field tolerance is measured by the relationship of critical current Ic to magnetic field H at a given temperature T below critical temperature Tc, the temperature tolerance is measured by the relationship of critical current Ic to temperature T at a given magnetic field below critical magnetic field Hc, the ac loss is measured by the amount of ac loss versus the frequency and magnitude of applied ac currents and fields, and the strain tolerance is measured by critical current Ic degradation with strain.
Owner:GENERAL ELECTRIC CO
A samarium cobalt sintered permanent magnet material and its preparation method
ActiveCN104637642BSpeed up coolingIntegrity guaranteedInorganic material magnetismCobaltCritical magnetic field
A samarium and cobalt sintered permanent magnet material comprises, in weight percent, 25-27%wt of samarium, 49-51%wt of cobalt, 5-6.5%wt of copper, 3-3.5%wt of zirconium and 15-18%wt of iron. A preparation method includes the steps: smelting; casting an ingot; absorbing hydrogen for the cast ingot; making powder; performing orientation forming and sintering. In the smelting process, the thickness of a casting mould cavity is decreased, cooling water is filled into the wall of the mould cavity, cooling of the cast ingot is accelerated, element composition segregation is decreased, the production process is stabilized, a dendrite crystal is restrained by adding a zirconium element, hydrogen absorbing is performed for the cast ingot in the smelting process, production steps are saved, and energy consumption is reduced. In the subsequent milling process, the cast ingot absorbed hydrogen is crystallized into particles, the particles fracture along crystal boundaries in the milling process of airflow, the integrality of crystal particles is ensured, the anisotropy of the crystal particles is improved, magnetic powder particles are obtained, particle size distribution is concentrated with the range of 3.5-4.5 micrometers, the sintering temperature needed by the magnetic powder particle of each point of a blank is the same in the later sintering process, the sizes of the sintered crystal particles are the same and uniform, and the performances, particularly, such as residual magnetism Br, maximum magnetic energy product (BH) max and critical magnetic field Hk of a sintered permanent magnet are improved.
Owner:NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
Preparation method for high-flexibility samarium-cobalt permanent magnet
ActiveCN105931777APrevent oxidationSame size and uniformInductances/transformers/magnets manufactureMagnetic materialsHydrogenAntioxidant
The invention discloses a preparation method for a high-flexibility samarium-cobalt permanent magnet. The preparation method comprises the steps of preparing raw materials, carrying out vacuum melting, carrying out hydrogen demolishing, adding a small amount of silver, a dispersing agent and an antioxidant to a jet mill to be grinded, carrying out orientation and blank pressing, and sintering the blank to obtain the product. The samarium-cobalt permanent magnet prepared by the preparation method has obviously fine crystalline grains, so that it is ensured that the sintered crystalline grains are equal in size and uniform; and therefore, the fracture toughness property of the sintered permanent magnet is improved, particularly, the residual magnetism Br, the maximum magnetic energy product (BH)max and critical magnetic field Hk are improved.
Owner:NINGBO NINGGANG PERMANENT MAGNETIC MATERIALS
Rutherford cable based on ReBCO isotropic superconducting strands
InactiveCN107346681AIncrease operating temperatureThe critical current is isotropic and goodSuperconductors/hyperconductorsSuperconductor devicesElectrical conductorNuclear fusion
The invention belongs to the technical field of superconducting electrical engineering, and in particular relates to a Rutherford cable based on ReBCO isotropic superconducting strands. When a high field magnet coil is manufactured with a high current low temperature superconducting cable, the problems of low operation current density, low critical magnetic field intensity, small operation temperature range, poor stretch mechanical property and the like are solved. The invention proposes the Rutherford cable based on ReBCO isotropic superconducting strands. The cable is composed of a center conductor, the ReBCO isotropic superconducting strands, a metal sheath and a cooling channel. The ReBCO isotropic superconducting strands are closely arranged as sub-strands around the center conductor and are spirally wound. Complete transposition of the ReBCO isotropic superconducting strands is realized. The Rutherford cable has the advantages of great critical current isotropy, high operation temperature, high operation current density, good mechanical property, easy bending, simple and mature production process and the like, and is suitable for large-scale production. The application of the ReBCO isotropic superconducting strands in a nuclear fusion large superconducting magnet coil and other devices is expanded.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
Method for producing a HTS coated conductor and HTS coated conductor with reduced losses
ActiveUS20120015818A1Easy to usePromote resultsSuperconductors/hyperconductorsSuperconductor device manufacture/treatmentElectrical conductorHigh-temperature superconductivity
A method for producing a high temperature superconductor (=HTS) coated conductor (12), wherein a buffer layer (2; 22) and an HTS layer (4; 24; 65) are deposited on a substrate (1; 21), with the following steps: a) after depositing the buffer layer (2; 22), the surface (2a) is locally roughened, resulting in a roughened surface (13), b) a non-superconducting, closed intermediate layer (3; 23) is deposited on top of the roughened surface (13), c) and the HTS layer (4; 24; 65) is deposited on top of the intermediate layer (3; 23). A simple method for producing a HTS coated conductor with reduced losses, and with improved critical current and critical magnetic field is thereby provided.
Owner:BRUKER HTS
Method for superconducting connection between MgB2 superconducting wires via a MgB2 matrix made from a boron powder compressed element infiltrated with Mg
ActiveUS20100216647A1Maintain porosityImprove current carrying capacityFoundry mouldsSuperconductor detailsCarrying capacityCritical magnetic field
A method for superconductingly connecting two or more wires (1, 2), each comprising at least one filament (3a-3d) that contains MgB2 or a mixture of Mg and B, wherein a superconducting connection is realized through exposed end regions (4a) of the filaments (3a-3d) via an MgB2 matrix, is characterized in that a bulk boron powder (4) is provided into which the exposed end regions (4a) of the filaments (3a-3d) of the wires (1, 2) project, the boron of the bulk boron powder (4) being present in amorphous modification. The bulk powder (4) is then compacted together with the projecting exposed end regions (4a) of the filaments (3a, 3b) to form a compressed element (8) and the compressed element (8) is infiltrated with molten magnesium (10) from the surface (13) of the compressed element (8). The method improves the quality, in particular, the current-carrying capacity and the critical magnetic field strength of a superconducting connection of MgB2 superconducting wires.
Owner:BRUKER SWITZERLAND AG
Rare earth doped niobium material for radio frequency superconducting cavity and preparation method thereof
InactiveCN103397236AReduce the mean free pathHigh Quench Magnetic FieldElectric discharge heatingVacuum evaporation coatingNiobiumRare earth
The invention relates to a rare earth doped niobium material for a radio frequency superconducting cavity, belonging to the technical field of superconducting accelerators. The rare earth doped niobium material is a high-purity niobium material doped with a scandium or yttrium element, and the atomic ratio content range of the doped scandium or yttrium is 0.01%-0.5%. The preparation method comprises a smelting doping way or an ion injection way. In the rare earth doped niobium material prepared by the smelting doping way, impurity atoms can be uniformly distributed in the niobium material; and in the rare earth doped niobium material prepared by the ion injection way, the impurity atoms can be only distributed in a 500nm range of the surface layer of the niobium material. The niobium material disclosed by the invention can reduce the electron mean free path of the material and improve. According to the invention, the electron mean free path of the niobium material disclosed by the invention can be reduced and a lower critical magnetic field and an upper critical magnetic field can be improved. The radio frequency superconducting cavity prepared by the material has a higher quenching magnetic field and can work under a higher magnetic field and provide a higher acceleration electric field. A smelting doping method disclosed by the invention is relatively simple, and the preparation speed is high. By adopting an ion injection method, the doping content is easy to control, and the using quantity of the scandium or the yttrium is also saved.
Owner:赵夔
Alarm method for preventing power theft through strong magnetic field
InactiveCN104916060AGuaranteed accuracyReduce workloadBurglar alarm electric actuationCritical timeFully automatic
An alarm method for preventing power theft through a strong magnetic field comprises the following steps: a. detecting the magnetic field strength around an electric energy meter; b, judging whether the magnetic field strength around the electric energy meter exceeds critical magnetic field strength, and determining that an abnormal magnetic field occurs if the magnetic field strength around the electric energy meter exceeds the critical magnetic field strength; c, monitoring whether the duration of the abnormal magnetic field reaches critical time, and determining that there is hidden danger of power theft if the duration of the abnormal magnetic field reaches the critical time; d, sending an alarm signal to a worker, and recording the number of sending times of the alarm signal; and e, monitoring whether a response signal is received within set time after the alarm signal is sent and judging whether the number of sending times of the alarm signal reaches a set number of times, returning to step d under the condition that the number of sending times of the alarm signal does not reach the set number of times if no response signal is received, sending an alarm signal to a backend server if the number of sending times of the alarm signal reaches the set number of times, and then ending the process and automatically going to next round of alarm standby state. The method of the invention can be implemented in a fully automatic way, and is high in accuracy. By adopting the method, the hidden danger of power theft can be found the first time.
Owner:STATE GRID CORP OF CHINA +1
Graphene / doped two-dimensional layered material Van der Waals heterojunction superconducting composite structure, superconducting device and manufacturing method thereof
ActiveCN110429174AIncrease concentrationIncrease contactSuperconductor detailsDissimilar materials junction devicesHeterojunctionHigh critical temperature
The invention provides a graphene / doped two-dimensional layered material Van der Waals heterojunction superconducting composite structure, a superconducting device and a manufacturing method thereofand relates to the superconducting material technology field. A graphene layer and a layered structure of 2n + 1 layers formed by alternative doped two-dimensional layered materials are included. Anouter layer of the layered structure is the graphene layer, and the n is an integer of 1 to 50. A region where graphene and the doped two-dimensional layered material are completely overlapped vertically forms a superconducting region. The graphene layer and the doped two-dimensional layered material are self-assembled into one body by a Van der Waals force. A defect that an existing Van der Waalsheterojunction superconducting material can only work at an extremely low temperature is solved. The graphene / doped two-dimensional layered material heterojunction superconducting material has a simple structure, excellent performance, a high critical temperature and a high critical magnetic field, low material cost, and good mechanical and machining performance.
Owner:孙旭阳
Iron-based superconducting material with single-phase calcium-fluorine structure and method for preparing same
InactiveCN101747040ARaise the superconducting transition temperatureChange charge concentrationSuperconductors/hyperconductorsSuperconductor devicesChemical reactionRare earth
The invention relates to an iron-based superconducting material and a method for preparing the same. The composition of the material is expressed by the following formula: (Ca1-xREx)FeAsF, wherein x is more than 0.2 and less than 0.6; and RE maybe La, Ce, Pr, Nd or Sm. The method for preparing the material comprises the following steps of: preparing samples of precursors of CaAs and REAs; and using rare earth metallic ions to partially replace Ca ions at a high temperature by the solid-state chemical reaction method and the ion doping mechanism so as to obtain the iron-based superconducting material with a calcium-fluorine structure. The superconducting transition temperature of the superconducting material is 30 to 56K, and the preparation method is simple; and the upper critical magnetic field of the superconducting material at a low temperature is estimated to be 120 teslas, so that the superconducting material is applicable in fields of superconducting power transmission, generation of strong magnetic fields and the like.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
Superconducting connection between MgB2 superconducting wires via a compressed element made from HTS powder
InactiveUS8420558B2Simple and inexpensive methodHigh-quality jointSuperconductor detailsConnections effected by explosionCarrying capacityCritical magnetic field
Owner:BRUKER EAS
HTS coated conductor with particle inclusions, and method of production of an HTS coated conductor
InactiveUS20120015814A1Strong pinning effectSimplify preparationPolycrystalline material growthSuperconductors/hyperconductorsChemical fractionElectrical conductor
A high temperature superconductor (=HTS) coated conductor (1), comprising an HTS layer (11) deposited epitaxially on a substrate (2), wherein the HTS layer (11) exhibits a lattice with a specific crystal axis being oriented perpendicular to the substrate plane (SP), in particular wherein the HTS layer material is of ReBCO type and the c-axis (c) is oriented perpendicular to the substrate plane (SP), wherein the HIS layer (11) comprises particle inclusions (4),in particular wherein the particle inclusions (4) may be used to introduce pinning of magnetic flux, is characterized in that at least a part (4a) of the particle inclusions (4) are formed of the same material as the HTS layer (11), and / or of chemical fractions of the material of the HTS layer (11), such that the average stoichiometry of said part (4a) of the particle inclusions (4) corresponds to the stoichiometry of the HTS layer (11), and that the particle inclusions of said part (4a) are discontinuities of the lattice of the HTS layer (11). A more simple method for producing a HTS coated conductor with reduced losses, and with improved critical current and critical magnetic field is thereby provided.
Owner:BRUKER HTS
Quantum well terahertz detector
InactiveCN103107230AOvercome the disadvantages caused by the principleImprove responsivenessPhotometry using electric radiation detectorsSemiconductor devicesPotential wellGrating
The invention discloses a quantum well terahertz detector which is composed of a multiple quantum well chip and a superconducting magnet system. Interaction between a donor level in a barrier layer in the multiple quantum well chip and a sub-band energy level in a potential well layer is regulated effectively by exerting an applied magnetic field so that electrons are transferred from a ground state sub-band energy level in the potential well layer to the donor level in the barrier layer, and incidence THz radiation is detected by utilizing electron transition between the donor levels in the barrier layer. According to the quantum well terahertz detector, after the applied magnetic field increases to a critical magnetic field Bc, due to the fact that THz detecting can be conducted by utilizing electron transition between the donor levels, the quantum well terahertz detector is free from grating coupling or angle lapping coupling of 45 degrees, the THz radiation is absorbed and responded under the condition of normal incidence, the defects caused by principle of an existing quantum well structure detector are overcome, and responsivity can be improved substantially.
Owner:CHANGZHOU INST OF OPTOELECTRONICS TECH +1
Method and Apparatus for Treatment of a Fluid
ActiveUS20080190771A1Reduce liquid viscosityReduce apparent viscosityElectrostatic separatorsSludge treatmentClassical mechanicsCritical magnetic field
An apparatus for the magnetic treatment of a fluid which produces at least one magnetic field for a period of time, Tc at or above a critical magnetic field strength, Hc, the period Tc and the field strength Hc determined relative to one another and dependant upon the properties of the fluid.
Owner:TEMPLE UNIVERSITY
Method for producing a hts coated conductor and hts coated conductor with reduced losses
InactiveCN102376869ASuperconductor device manufacture/treatmentElectrical conductorHigh-temperature superconductivity
A method for producing a high temperature superconductor (=HTS) coated conductor (12), wherein a buffer layer (2; 22) and an HTS layer (4; 24; 65) are deposited on a substrate (1; 21), with the following steps: a) after depositing the buffer layer (2; 22), the surface (2a) is locally roughened, resulting in a roughened surface (13), b) a non-superconducting, closed intermediate layer (3; 23) is deposited on top of the roughened surface (13), c) and the HTS layer (4; 24; 65) is deposited on top of the intermediate layer (3; 23). The invention provides a simple method for producing a HTS coated conductor with reduced losses, and with improved critical current and critical magnetic field.
Owner:BRUKER HTS
Preparation method iron based SmFeAsO1-xFx superconducting wire
InactiveCN101345103BEvenly distributedIncrease the critical current densitySuperconductors/hyperconductorsSuperconductor devicesCritical magnetic fieldSuperconducting transition temperature
Owner:SOUTHWEST JIAOTONG UNIV
Refractive index measurement equipment and refractive index measurement method and device
ActiveCN106290254AExpand the range of refractive index measurementExpand the scope of measurementPhase-affecting property measurementsMagnetic currentRefractive index
The invention relates to the technical field of optical measurement, and discloses refractive index measurement equipment and a refractive index measurement method and device. The refractive index measurement range of the refractive index measurement equipment is adjustable, and thus the measurement application range is widened. The refractive index measurement equipment comprises a magnetic field generation device generating an adjustable magnetic field, a shell, a light transmitter, a light receiver, a sample to be measured and a control processor, wherein the shell is located in the magnetic field generated by the magnetic field generation device and is filled with magnetofluid, the light transmitter, the light receiver and the sample to be measured are immersed in the magnetofluid, and the control processor is connected with the magnetic generation device and the light receiver. The light transmitter is used for transmitting light towards the sample to be measured, the light receiver is used for receiving light reflected by the sample to be measured, and the included angle of the reflected light and the incident light is a set included angle; the control processor is used for judging whether total reflection can happen, determining the refractive index of the magnetofluid according to the critical magnetic field intensity in total reflection and determining the refractive index of the sample to be measured according to the refractive index of the magnetofluid and the set included angle.
Owner:BOE TECH GRP CO LTD
Single-phase iron-based superconducting material based on fluoride and preparation method thereof
InactiveCN101747041ADoping achievedSuperconductivity achievedSuperconductors/hyperconductorsSuperconductor devicesChemical reactionRare earth
The invention relates to a single-phase iron-based superconducting material based on a fluoride and a preparation method thereof. The material has a quasi-two-dimensional laminate structure and constitution is represented by the following formula: (Ba1-xREx)FeAsF, wherein x is more than 0.35 but less than 0.60, and RE is La, Ce, Pr, Nd or Sm. The preparation method of the material comprises: firstly preparing BaAs, LaAs, CeAs, PrAs, NdAs and SmAs precursor samples, and partially replacing bivalent Ba ions with tervalent rear earth metal ions at high temperature by using a solid state chemical reaction method and an ion mechanism of doping effect to prepare the iron-based superconducting material based on the fluoride. The material has electronic carrier characteristics, the carrier concentration is 1020-1022 / cm3, the superconducting transformation temperature of the superconducting material is about 51K, and the preparation method is simple. The material has an upper critical magnetic field expected to be more than 150 tesla at low temperature and can be applied to the aspects, such as superconducting electricity transmission, generation of strong magnetic field and the like. In addition, the material can be applied to the aspects, such as superconducting filters and the like.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
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