341 results about "Superconducting material" patented technology

The invention provides a method for preparing an iron-based superconducting material single crystal in a microgravity environment, and belongs to the field of superconducting materials. The method specifically comprises the following steps: carrying out a microgravity crystal growth experiment in a high-temperature experiment cabinet of a space station, putting a solid-phase sintered or pre-melted rod-like raw material into a furnace body, heating and melting, then slowly solidifying, and finally growing the iron-based superconducting material single crystal with large size and extremely low defect density.

The present invention relates to the technical field of superconducting materials. Disclosed are a MgB2 superconducting wire and a preparation method therefor. The preparation method comprises: melting Mg, Cu and Ti to obtain a Mg alloy ingot, processing the Mg alloy ingot to obtain a Mg alloy rod, loading the Mg alloy rod and B powder into a Nb tube to obtain a composite rod, processing the composite rod to obtain a single-core wire, loading the single-core wire into an oxygen-free copper tube, then loading into a monel tube in a densely-packed manner, and performing cold-forming treatment to obtain a multi-core composite wire; and performing high-temperature phase-forming heat treatment on the multi-core composite wire to prepare the MgB2 superconducting wire. In the present application, the Mg alloy rod containing Cu and Ti metal elements is used as a Mg source for preparing a MgB2 multi-core wire, so as to improve the plastic deformation ability of the Mg alloy rod in the wire treatment processes, and improve the grain boundary coupling, thereby improving the current carrying performance of the MgB2 superconducting wire.

The invention belongs to the technical field of superconducting material processing, and discloses a multi-barrier-layer MgB2 superconducting wire and a preparation method thereof. A plurality of groups of interlayers of the wire are composed of Cu / Ni / Nb, outer-layer copper serves as a stabilizer, Ni serves as a low-cost outer barrier layer, Ni and the outer-layer copper are mutually diffused in the hot extrusion process to form a stable Cu-Ni compound, and Nb foil is added into the Ni layer to serve as an inner barrier layer so as to restrain the diffusion problem of a small amount of Ni-Mg. According to the multi-barrier-layer MgB2 superconducting wire, Nb is greatly replaced by Cu / Ni, the raw material cost is remarkably reduced, the barrier layers are mutually diffused in the hot extrusion process to achieve metallurgical bonding, uniform deformation of the wire in the subsequent machining process is facilitated, the possibility of damage of the barrier layers is reduced, the current-carrying performance of the wire is improved, the Jc of the multi-barrier-layer MgB2 superconducting wire under 4.2 K and 3T is 5199-6271 A / mm < 2 >, and the service life of the multi-barrier-layer MgB2 superconducting wire is prolonged. And the current-carrying performance is obviously improved, and the application prospect is wide.

The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an Nb3Sn superconducting wire. The method mainly comprises the steps that Nb-Zr alloy is loaded into the exterior and / or the center of a Sn-Cu single-core rod, oxide powder is filled between the Nb-Zr alloy and the Sn-Cu single-core rod, then the Sn-Cu single-core rod and the Nb-Zr alloy are loaded into a copper substrate, and Nb3Sn subcomponents are obtained after multi-pass stretching, forming and fixed-length cutting; and uniformly arranging the Nb3Sn sub-components in the copper pipe along the circumferential direction to form a bundle, and after multi-pass stretching, carrying out heat treatment and cutting to obtain the Nb3Sn superconducting wire. By introducing the artificial point pinning array in density gradient distribution, the critical current density of the Nb3Sn superconducting wire in a high magnetic field of 8T-16T is enhanced, the problems that an existing uniform artificial point pinning center scheme generates a matching effect and limits the actual application of the superconducting wire are solved, and the decline degree of the critical current density of the Nb3Sn superconducting wire in the high field is relieved.

The invention relates to a superconducting electrical switch. The switch comprises two parallel branches of superconducting material in a loop, and a magnetic field generator which generates a time-varying magnetic field through the loop in a direction generally parallel to the axis of the loop. The magnetic field generator is selectively activated and de-activated to switch the electrical switch between a low-resistance state and a higher-resistance state. In the low-resistance state, there is no magnetic field through the loop and transport current flows through the loop. In the higher-resistance state, a magnetic field through the loop induces a screening current such that the sum of the transport current and the screening current is substantially equal to the critical current or is greater than the critical current of the superconducting material. The switch may be used in, for example, a rectifier or fault current limiter.

A superconductor magnet system including a superconductor magnet including a plurality of field coils connected in series, each field coil having a plurality of turns including superconductor material. The system also includes a primary electric current source connected across the plurality of the field coils for supplying a DC electric current to the field coils to generate a magnetic field. The system further includes a secondary electric current source connected in parallel with the primary electric current source across a subset of the field coils for supplying an additional DC electric current to the or each field coil in the subset to modify or correct the magnetic field.

An example method described herein includes operating a first component of a circuit. The method also includes, while operating the first component, supplying a current to a superconducting wire that is thermally-coupled to the first component, and determining whether the superconducting wire has transitioned between a superconducting state to a non-superconducting state in response to the current. The method further includes measuring a temperature of the first component based on whether the superconducting wire transitioned between the superconducting state to the non-superconducting state in response to the current, and adjusting operation of the first component in accordance with a determination that the temperature exceeds a predetermined threshold temperature.

The invention discloses a multi-field coupling fatigue test device and method for a high-temperature superconducting tape, and belongs to the field of superconducting tape fatigue tests.The multi-field coupling fatigue test device for the high-temperature superconducting tape comprises a fatigue testing machine, and a test container used for providing a low-temperature field is arranged in a test area of the fatigue testing machine; a clamp assembly used for fixing a sample to be tested is arranged in the experiment container, the clamp assembly is connected with a current assembly used for providing an electric field, and a magnet assembly used for providing a magnetic field is arranged in the experiment container. According to the multi-field coupling fatigue test device and method for the high-temperature superconducting strip, the limitation of an existing test means is broken through, and a reliable experimental platform and application value are provided for mechanical property research and service life evaluation of superconducting materials and other low-temperature service materials.

A superconducting qubit-based device includes: a superconducting qubit comprising a first conductive pad and a second conductive pad, each being formed of a superconducting material, and a ferromagnetic body configured to form a Josephson junction with the first conductive pad and the second conductive pad; a conducting wire spaced apart from the ferromagnetic body by a predetermined distance; and a control circuit configured to control a resonance frequency of the superconducting qubit by controlling a current flowing through the conducting wire.

The invention discloses a preparation method of stable in-situ 14: 24 AEC second-phase Bi-2212 powder, which comprises the following steps: preparing powder with specific components by controlling the components of a Bi-2212 precursor solution, and then adjusting by a fine heat treatment process to obtain the stable in-situ 14: 24 AEC second-phase Bi-2212 powder. According to the method disclosed by the invention, components of a Bi-2212 precursor solution are controlled, the components of Bi-2212 precursor powder after heat treatment and the molar ratio of Sr to Ca are monitored to be within a specific range, and a heat treatment process is matched for adjustment, so that stable generation of a 14: 24 AEC second phase in the Bi-2212 precursor powder is ensured; the self-generated 14: 24 AEC second phase can improve the critical current density of the Bi-2212 superconducting material; the method is easy to operate, low in cost, high in controllability and operability and suitable for being rapidly applied to the field of Bi-2212 superconducting material preparation.

Techniques are described for lowering strains applied to superconducting material in a superconducting magnet by arranging structural partitions between turns of the superconducting material that intercept and transfer strain to a mechanically stronger structure, such as the housing of the magnet. A structural partition may be formed with a feedthrough slit so that the superconducting material can easily pass through the partition. A number of structural partitions may be interspersed between groups of turns of superconducting material in a magnet so that forces can be sufficiently distributed by the partitions throughout the magnet. At the same time, the number of structural partitions may be selected to minimize the amount of space within the magnet occupied by the partitions that could otherwise be occupied by current-carrying superconducting material.

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb3Sn superconducting wire integrated with a piezoelectric sensing function and a preparation method of the internal tin method Nb3Sn superconducting wire. According to the method, a piezoelectric functional layer and a dielectric layer are prepared on the surface of a SnAl alloy rod, a CuAg alloy rod is installed after drilling to form a composite rod, the composite rod is inserted into an inner tin method Nb3Sn / CuNb composite pipe to be drawn into a subcomponent, then the subcomponent is bundled and installed into a Ta pipe and an oxygen-free copper pipe, and the wire is prepared through multiple times of stretching. The piezoelectric functional layer can convert micro strain into measurable electric signals, in-situ real-time monitoring of mechanical stress and the like in the wire rod is achieved, the CuAg alloy bar can stabilize the tensile strength of the wire rod and promote generation of an Nb3Sn phase, and on the premise that the superconducting performance is not affected, the operation reliability and safety of the high-field magnet under the extreme working condition are improved.

The invention belongs to the technical field of quantum functional materials, and particularly relates to an FCC structure Mo-based medium-entropy carbide superconducting material and a preparation method thereof. According to the method, Mo, Ir and C are ground and pressed into blocks according to the stoichiometric ratio, the Mo3Ir2C polycrystalline block of a face-centered cubic structure is synthesized in one step through electric arc melting, the superconducting transition temperature of the Mo3Ir2C polycrystalline block is 3.33 K, and the upper critical field of the Mo3Ir2C polycrystalline block is 2.53 T. Meanwhile, Pt is further used for partially replacing Ir to prepare Mo3IrPtC, the valence electron concentration is increased to 6.83 from 6.67, the superconducting performance is further optimized, the transformation temperature reaches 3.50 K, and the upper critical field is increased to 4.05 T. The material is a new member of the superconducting family, provides a platform for exploring the superconducting performance of the middle / high-entropy carbide in the face-centered cubic structure, can be used in the fields of electric power communication and the like, enriches related researches, and promotes the practical application of the middle / high-entropy superconductor.

The invention relates to the technical field of superconducting material detection, and discloses a pollution-free laser pretreatment type superconducting material detection platform, which comprises a sample numerical control pretreatment assembly for pretreating a superconducting material sample; the laser smooth cleaning assembly is arranged on one side of the sample numerical control pretreatment assembly and is used for carrying out smooth cleaning on the surface of the superconducting material sample; and the performance test output assembly is arranged on one side of the laser smooth cleaning assembly and is used for carrying out resistance characteristic test on the superconducting material sample under different temperature conditions. According to the invention, the integrated series design of sample numerical control pretreatment, laser smooth cleaning and low-temperature resistance testing realizes a whole-process closed loop from sample processing, surface cleaning to performance verification, so that manual intervention and secondary pollution are reduced, the structural integrity of the superconducting material is guaranteed, the accuracy of detection data is improved through a standardized process, and the detection efficiency is improved. And performance verification, research and development and application of the high-efficiency support superconducting material.

The invention discloses a high-temperature superconducting strip with non-uniform distribution of critical current density and a preparation method thereof, and belongs to the technical field of high-temperature superconducting materials. The critical current density of the high-temperature superconducting strip is non-uniformly distributed in the width direction, the current distribution of the high-temperature superconducting strip can be regulated and controlled according to requirements, the high-temperature superconducting strip comprises a high-temperature superconducting layer, the chemical formula of the high-temperature superconducting layer is Re < 1 + a > Ba < 2 + b > Cu < 3 + c > O < 7-d + x% (mol) BaMO3, and Re is selected from Y, Gd, Eu and Sm; m is selected from Hf, Zr and Sn; the preparation method comprises the following steps: depositing the high-temperature superconducting layer on the strip substrate; depositing a metal silver layer on the deposited strip; and carrying out heat treatment on the deposited strip in an oxygen environment, and carrying out laser heat treatment after slitting and / or copper plating. The critical current density of the high-temperature superconducting strip in the width direction is non-uniformly distributed and controllable, the failure risk of the strip is effectively reduced, and the service performance of the strip is improved.

Systems and methods for resetting a qubit are provided. In one example, a reset circuit may include a resonator structure. The resonator structure may be configured to resonate at a first frequency and a second frequency. The resonator structure may include a superconducting material characterized by a superconducting energy gap. An energy corresponding to the first frequency may be below the superconducting energy gap. An energy corresponding to the second frequency may be above the superconducting energy gap. The reset circuit can further comprise a frequency converter configured to convert an excitation of the resonator structure from the first frequency to the second frequency.

Systems and methods disclosed herein may comprise a bottom hole assembly; and a cable disposed in the wellbore. In examples, the cable may comprise a superconducting material configured to provide at least power to the bottom hole assembly; one or more liquid supply channels configured to supply a fluid to reduce temperature of the superconducting material; and one or more liquid return channels. Further, cryogenic liquid may be pumped through the liquid supply channels.

This invention relates to the field of high-temperature superconducting material performance testing technology, and particularly to a high-temperature superconducting tape testing device. The device includes a tape testing apparatus with tape winding and unwinding mechanisms at both ends. The apparatus includes a liquid nitrogen tank for storing liquid nitrogen. A portion of the tape to be tested is located within the liquid nitrogen tank, with both ends of the tape passing through through holes in the liquid nitrogen tank and wound onto winding and unwinding wheels in the tape winding and unwinding mechanisms. Each end of the testing apparatus has a tape reheating device, which includes a constant temperature chamber with an inlet and an outlet hole. This invention features a simpler and more rational structural layout, enabling better tape winding and unwinding operations and improving testing accuracy.

The invention belongs to the technical field of superconducting material processing, and discloses a near-infrared optical response Nb3Sn superconducting wire and a preparation method thereof. The Nb3Sn superconducting wire with near-infrared optical response comprises an optical functional coating, the optical functional coating is formed by embedding periodically-arranged plasmon metal micro-nano structures into a high-transparency dielectric substrate, the plasmon metal micro-nano structures are gold nanorod arrays or silver nanoring, the dielectric substrate is made of a SiO2-polyimide composite material, and the thickness of the dielectric substrate is 10-20 micrometers. The Nb3Sn superconducting wire with the near-infrared optical response has high absorptivity and photoelectric response in the near-infrared band, in-situ optical sensing of temperature, stress and magnetic field intensity can be synchronously achieved, the interface compatibility of the optical functional coating and the Nb3Sn superconducting basic wire is good, meanwhile, the influence of the added optical functional coating on the performance of the superconducting wire is small, and the service life of the superconducting wire is prolonged. And the method has a wide application prospect in the aspect of constructing an integrated optical-electric-magnetic multifunctional device.

The application discloses a treatment method for reducing carbon content of REBCO powder, and relates to the technical field of superconducting material preparation. The treatment method is that the REBCO powder is placed in an ozone-containing atmosphere for heat treatment. The core principle of the treatment method is that the strong oxidizing property of ozone and active oxygen atoms generated by the decomposition of ozone are used to directly oxidize carbon impurities in the REBCO powder into CO2 gas at a lower temperature, and meanwhile, the superconducting phase is avoided from being damaged. It is verified by a carbon analyzer that the carbon reduction efficiency of the powder after ozone heat treatment is several times higher than that of the powder after traditional oxygen atmosphere treatment.

This invention discloses a low-loss superconducting transformer device, comprising an internal transformer unit with a coil inside, and including a cooling mechanism, a ventilation mechanism, and an alarm mechanism. The cooling mechanism is used to reduce the temperature of the internal transformer unit and is located outside the internal transformer unit. The ventilation mechanism is used to ventilate the cooling mechanism and is located on top of the cooling mechanism. Activating the cooling mechanism lowers the temperature inside the internal transformer unit, allowing the superconducting material used in the internal transformer unit to operate normally, thereby reducing energy loss. The ventilation mechanism ensures sufficient air inside the alarm mechanism. When the cooling mechanism malfunctions, liquid nitrogen leaks, liquefying the surrounding air. The resulting water activates the alarm mechanism, alerting personnel to the leak.

The application discloses a method for improving critical current of REBCO superconducting layer and relates to the technical field of superconducting materials.The method for improving critical current of REBCO superconducting layer comprises the following steps: REBCO superconducting tapes are annealed in a pure oxygen atmosphere, quenched to 20-25 DEG C, and then the surface silver layer is removed by a chemical method, after which the REBCO superconducting tapes are annealed in a mixed atmosphere of ozone and oxygen, and a protective layer is deposited, so that the critical current of the REBCO superconducting layer is finally improved.The carrier concentration of the REBCO superconducting tapes can be effectively controlled through the specific multi-step oxidation process, so that the REBCO superconducting tapes break through the under-doped state commonly existing in the prior art, reach the over-doped level, and then the critical current performance of the tapes is significantly improved.The method has simple process, high stability and high industrial feasibility, and can meet the demand of higher current-carrying capacity of REBCO tapes in key fields such as power transmission and high-field magnets.

The application provides a yttrium barium copper oxide photonic crystal and a preparation method thereof. 7‑x The photonic crystal structure is composed of periodic yttrium barium copper oxide (YBa2Cu3O 7‑x ) superconducting material circular crystal columns, the lattice constant is 2630nm, and the radius of the circular crystal column is 500nm. The photonic crystal can change the position and width of the band gap by changing the light incidence angle, so that the middle infrared band gap is realized. The photonic crystal is prepared by adopting a magnetron sputtering method to prepare a yttrium barium copper oxide film on a strontium titanate single crystal substrate, and then adopting a focused ion beam method to process the yttrium barium copper oxide film into a periodic nanostructure composed of yttrium barium copper oxide circular crystal columns, so that the yttrium barium copper oxide photonic crystal is obtained. The preparation method of the yttrium barium copper oxide photonic crystal is simple and easy to control.

The invention relates to the field of superconducting material preparation, and discloses a method for preparing an MgB2-MgB2 superconducting joint through hot pressed sintering, which comprises the following steps: preparing metal magnesium powder and nano boron powder subjected to surface coating treatment into an intermediate connecting agent according to a ratio, and filling a joint area between superconducting wires with the intermediate connecting agent; and hot pressing sintering treatment is carried out under the controlled atmosphere, and a continuous and compact MgB2 phase connection structure is formed. In order to improve the interface bonding quality and oxidation resistance, a porous SiC transition layer can be introduced into the joint interface in advance, and staged atmosphere control is adopted to achieve grain boundary purification and regulation. The method is simple in operation process, low in joint resistance and high in shear strength, has excellent thermal stability and electrochemical stability, and is suitable for actual connection application of high-performance superconducting devices.

Compositions of matter and methods of identifying and making compositions of matter are disclosed. Some embodiments disclose making and chemically and / or compositionally tuning superconducting hydride materials. Some embodiments disclose an apparatus for making and compositionally tuning superconducting materials. Some embodiments disclose a composition of matter including a solid hydride exhibiting superconductivity at a temperature of at least 150 kelvin at an ambient pressure below 180 gigapascals, or at a temperature of at least 261 kelvin. In one or more embodiments, the superconductor includes a covalent metal hydride having at least three different chemical elements wherein an inter-atomic distance between the hydrogen in the covalent metal hydride is in a range of 1.1-2 angstroms. In yet further examples, the superconductor is formed using molecular exchange and compression of a Van der Waals solid. In yet further examples, the superconductor comprises molecular hydrogen disposed in 1-dimensional channels. These and other embodiments are disclosed herein.

The utility model provides a magnetic conductivity measuring device for a superconducting material sample. The magnetic conductivity measuring device comprises a Dewar tank, a sealing assembly, a first heat insulation module, a second heat insulation module, a coil assembly and a magnetic conductivity measuring assembly, a hollow cavity is formed in the Dewar tank, and a superconducting material sample is arranged in the hollow cavity; the sealing assembly covers the opening end of the Dewar tank in a sealing manner; the first heat insulation module is arranged on the sealing assembly and conducts heat insulation on the opening end of the Dewar tank. The second heat insulation module is arranged on the side wall of the Dewar tank and is used for carrying out heat insulation on the side wall of the Dewar tank; the coil assembly is arranged in the hollow cavity of the Dewar tank and surrounds the superconducting material sample; and the magnetic conductivity measuring assembly is electrically connected with the coil assembly. By arranging the first heat insulation module and the second heat insulation module, heat leakage between the external environment and the hollow cavity of the Dewar tank can be effectively reduced, so that the accuracy of a magnetic conductivity test result is improved.

The invention discloses a method for preparing an internal tin method Nb3Sn superconducting material by using a sol-gel method, which comprises the following steps: preparing Nb / Sn gel by using the sol-gel method, and drying and pre-sintering the Nb / Sn gel to obtain Nb / Sn / O mixed powder; uniformly mixing the Nb / Sn / O mixed powder with Sn powder and Y powder to obtain Nb / Sn / O / Sn / Y mixed powder; loading the Nb / Sn / O / Sn / Y mixed powder into a barrier tube, and then loading the barrier tube into an oxygen-free copper tube to obtain a component; the components are densely arranged and loaded into an oxygen-free copper sheath, gaps are filled with oxygen-free copper rods in an inserted mode, and an Nb / Sn / O / Cu / Y composite ingot is obtained; and adding copper covers at the two ends of the Nb / Sn / O / Cu / Y composite ingot, and performing vacuum electron beam seal welding, extrusion and multi-pass drawing to obtain the Nb3Sn superconducting material. According to the prepared Nb3Sn superconducting material, the grain size of the Nb3Sn superconducting phase is smaller, and the structure is more stable.

In a general aspect, a flexible cable communicates electromagnetic signals in a cryogenic system. In some aspects, the flexible cable includes a signal layer and a ground layer. The signal layer includes signal lines embedded in adhesive material. Each signal line includes a multilayer structure. The multilayer structure includes a layer of non-superconducting material and a layer of rhenium metal. The ground layer is laminated to the signal layer.

The invention discloses a terahertz detection unit based on a dielectric couple two-level system and an array detector. The array detector comprises an array composed of resonance detection units. The resonance detection unit comprises a broken line inductor, an interdigital capacitor and a coupling feeder line which are connected, and a dielectric layer and an absorber are stacked on the interdigital capacitor. Wherein the absorber is located above the dielectric layer, so that the dielectric layer isolates the interdigital capacitor from the absorber; and the broken line inductor, the interdigital capacitor, the coupled feeder line and line bodies connected among the components are all made of superconducting materials. The absorber is a grid body made of a non-superconducting metal material. After the absorber is used for receiving terahertz radiation, energy is transmitted to the dielectric medium, a dipole two-energy-level system in the dielectric medium is changed, the dielectric constant of the dielectric medium is changed, then the resonant frequency of the resonance detection unit is changed, and terahertz wave detection and imaging are achieved by analyzing the change of the resonant frequency of the resonance detection unit.

This invention discloses a method for preparing iron-based superconducting materials, comprising: according to the chemical formula Ae 1‑x A x+a Fe 2‑b As 2+c The mixture is prepared and thoroughly mixed to obtain unreacted raw starch. Ae is an alkaline earth metal element, A is an alkali metal element, 0.15 ≤ x ≤ 0.8, 0