208 results about "Superconducting material" patented technology

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.

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.

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 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.

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.

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 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

An inductive component comprising an inductive element comprising a stack of an outer plurality of first strips of magnetic material, a central plurality of second strips of superconducting material, and an outer plurality of third strips of magnetic material, the inductive element being flexible and configured to form at least one loop of said stack of first strips, second strips and third strips, wound on itself. Also an inductive device and an aircraft with such an inductive component or device.

The invention belongs to the technical field of superconducting materials, and particularly relates to a functional gradient barrier layer and application thereof. Chemical components of the functional gradient barrier layer change in a gradient mode in the thickness direction of the functional gradient barrier layer, the functional gradient barrier layer is a Nb-rich element area close to one side area of the NbTi superconducting core wire, and the atomic percent of Nb elements is larger than or equal to 90%; in a region close to one side of the Cu substrate, the functional gradient barrier layer is a Cu element-rich region or a Cu element-containing alloy region, and the atomic percent of the Cu element is greater than or equal to 95%; and a gradient layer with continuous transition of chemical components is arranged between the Nb-element-rich region and the Cu-element-rich region or the Cu-element-containing alloy region.

The invention discloses a preparation method of a superconducting material and vacuum degassing equipment for preparing the superconducting material. The invention discloses a preparation method of a superconducting material. Vacuum powder is filled into a tube; the vacuum powder tubing specifically comprises the following steps that S1, superconductive powder is filled to obtain a powder tube blank; s2, the powder pipe blank is subjected to vacuum degassing treatment; and S3, sealing welding treatment is conducted on the powder pipe blank in the vacuum state, and then vacuum powder tubing can be completed. By analyzing the mechanism of poor grain boundary connectivity, gap gas between powder is found to be the main reason of the problem, so that the problem is solved from the source by adopting a method for performing vacuum degassing in the step of filling the powder into a pipe.

The invention belongs to the field of superconducting materials, and particularly relates to a method for preparing an iron-based superconducting wire strip, which comprises the following steps of: a) filling precursor powder of an iron-based superconductor into a first metal sheath to prepare a superconducting wire, and cutting to obtain a superconducting section material; b) preparing a metal raw material consistent with the material of the first metal sheath, preparing a metal wire, and cutting to obtain a metal section material; c) loading the superconducting section materials and the metal section materials into a second metal sheath, wherein the superconducting section materials and the metal section materials are alternately arranged in the second metal sheath; d) performing length extension on the material prepared in the step c) to obtain a wire strip; e) the wire strip is cut, the cutting position is the area, filled with the metal section material, of the wire strip, and wire strip sections are obtained; and f) welding and sealing the end surfaces of the wire strip sections, and then carrying out heat treatment to obtain the iron-based superconducting wire strip. According to the method, a segmented tubing mode is adopted, so that the error-tolerant rate of product preparation can be greatly improved, and meanwhile, various wire strip products can be efficiently prepared.

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 invention discloses a non-contact continuous nondestructive testing device and method for critical current uniformity of a high-temperature superconducting tape, which is applied to the field of superconducting material detection, and comprises an excitation magnet for generating a background magnetic field and exciting the high-temperature superconducting tape to generate magnetization current; the measuring probe consists of a magnetic circuit iron core, a fluxgate sensor and a copper strip compensation loop; the fluxgate sensor and the copper strip compensation loop are respectively connected with the control and measurement circuit through a fluxgate power supply acquisition circuit and a copper strip compensation loop power supply circuit; and the control and measurement circuit is used for implementing PID (Proportion Integration Differentiation) control through closed-loop negative feedback when the fluxgate sensor detects that the net residual magnetic flux in the magnetic circuit iron core is not zero, generating magnetic flux which is equal to and opposite to the high-temperature superconducting strip in size in the copper strip compensation loop, and calculating critical current according to current in the copper strip compensation loop when the net residual magnetic flux is zero. According to the method, rapid and accurate measurement of the critical current uniformity of the high-temperature superconducting strip without depending on a Hall sensor and calibration back calculation is realized.

The invention provides an insulation cooling conduction structure of a liquid-helium-free superconducting magnet, and relates to the technical field of superconducting magnets. An insulation cooling conduction structure of a liquid-helium-free superconducting magnet comprises a superconducting coil layer, a cold conduction part and an insulation cooling conduction part. The cold conduction part is sleeved on the superconducting coil layer, and the insulation cooling conduction part is located between the superconducting coil layer and the cold conduction part. The insulation cooling conduction part comprises a plurality of epoxy resin ring layers and at least one glass fiber ring layer. The glass fiber ring layers are sequentially clamped between every two adjacent epoxy resin ring layers, the epoxy resin ring layer located on the inner side is arranged on the superconducting coil layer in a solidified mode, and the epoxy resin ring layer located on the outer side is arranged on the cold conduction part in a solidified mode. The insulation cooling conduction structure of the liquid-helium-free superconducting magnet can timely export heat, avoids magnet quenching caused by the fact that the temperature exceeds the working interval of the superconducting material, and ensures the operation stability and safety of the liquid-helium-free superconducting magnet.

The invention belongs to the technical field of superconducting material processing, and discloses a magic angle graphene modified niobium-tin superconducting wire and a preparation method thereof. The magic angle graphene is modified on the surface of the core wire of the Nb3Sn superconducting wire prepared by the bronze method, the material can eliminate work hardening of a bronze matrix, and one-time and uninterrupted continuous stretching forming from a composite billet to the final wire is realized. In addition, the Nb3Sn superconducting wire has excellent mechanical performance, superconducting performance and strain tolerance, the magic angle graphene layer can effectively inhibit crack initiation and expansion of the Nb3Sn reaction layer under strain, and the mechanical performance of the wire is improved; the material not only can be used as an additional magnetic flux pinning center, but also can induce formation of finer Nb3Sn grains with tough grain boundaries, so that the critical current density of the wire is remarkably improved; the critical current irreversible strain limit of the Ni3Sn superconducting wire modified by the magic angle graphene is 0.8% and is obviously higher than that of a Ni3Sn superconducting wire prepared by a traditional bronze method.

A persistent current switch is disclosed for controlling, e.g. initiating, a persistent current in a superconductor loop. The persistent current switch comprises a piece of superconductor material that is part of the superconductor loop. Further, the persistent current switch comprises an illumination system that is configured to direct light onto the piece of superconductor material for influencing an electrical resistance of the piece of superconductor material. The illumination system is configured such that the light impinging on the piece of superconductor material substantially does not heat the piece of superconductor material.

This invention belongs to the field of superconducting materials technology and discloses an internal tin-based Nb3Sn superconducting wire with integrated piezoelectric sensing function and its preparation method. The method involves preparing a piezoelectric functional layer and a dielectric layer on the surface of a SnAl alloy rod, drilling a hole, inserting a CuAg alloy rod to form a composite rod, inserting it into an internal tin-based Nb3Sn / CuNb composite tube, drawing it into sub-components, and then bundling them into a Ta tube and an oxygen-free copper tube. The wire is then obtained through multiple stretching operations. The piezoelectric functional layer can convert minute strains into measurable electrical signals, enabling in-situ real-time monitoring of internal mechanical stresses within the wire. The CuAg alloy rod can stabilize the tensile strength of the wire and promote the formation of the Nb3Sn phase, improving the operational reliability and safety of high-field magnets under extreme conditions without affecting superconducting performance.

The invention relates to the field of superconducting material preparation, in particular to a superconducting material joint based on nanocrystalline copper bonding and a preparation method thereof.The preparation method comprises the following steps that the to-be-bonded surface of a strip is mechanically polished; electroplating a nanocrystalline copper layer on the surface to be bonded; electrochemically polishing the nanocrystalline copper layer; and the nanocrystalline copper layers of the two strips are in butt joint and bonded in a pressurized and heated mode, and then the connector is obtained. After the nanocrystalline copper layer is introduced on the surface, the bonding pressure and the bonding temperature can be reduced to be 50 MPa and 140 DEG C, interface grains are small, and even if defects exist on the bonding contact surface, the defects are gradually healed under the driving of the grain boundary, and the interface resistance is reduced.

The invention relates to the technical field of superconducting material surface treatment, and particularly discloses an electrochemical polishing solution for a superconducting niobium material and application of the electrochemical polishing solution. The polishing solution is formed by mixing 98wt% of concentrated sulfuric acid, 40wt% of hydrofluoric acid and absolute ethyl alcohol according to the volume ratio of 5: 1: 1. Compared with a traditional 9: 1 binary system, absolute ethyl alcohol is introduced to serve as a key third component, the acid-base ratio is optimized, and a ternary synergistic system is constructed. The absolute ethyl alcohol plays multiple functions of inhibiting pitting corrosion, improving the wettability and mass transfer process, controlling reaction kinetics and the like in a system, and has a synergistic effect with the adjusted acid proportion, so that the problems that pitting corrosion is easy to generate, the surface uniformity is poor and a process window is narrow in a traditional formula are effectively solved. The polishing solution is particularly suitable for carrying out 30-second short-time efficient polishing on the superconducting niobium plate under the condition of 15V direct-current voltage, and a pitting-corrosion-free and low-roughness ultra-smooth surface can be stably obtained.

A compression device according to the present invention, which compresses a material by using a centrifugal force, applies a centrifugal force to a material arranged in a ring shape to compress the material arranged in the ring shape with the centrifugal force. The material mentioned above may be hydrogen, helium, hydrogenated lanthanum, hydrogenated calcium, a high-pressure induced superconducting substance, or a quantum solid.

The invention provides a method for preparing a high-density Nb3Al block through spark plasma sintering, and relates to the technical field of superconducting material preparation. The method comprises the steps that firstly, pure Nb and pure Al are subjected to powder blending in proportion and placed in a planetary ball mill to be subjected to ball milling, and Nbss (Al) powder is obtained; then, Nbss (Al) powder obtained after ball milling is pressed into a block through a mold and then put into a tubular furnace to be sintered, and an Nb3Al block is obtained; the Nb3Al block obtained through sintering is crushed through a tungsten carbide mortar, and then the crushed Nb3Al powder is wrapped with tantalum foil and placed in a graphite mold to be sealed; and finally, the sealed mold is put into a discharge plasma sintering furnace to be sintered, and the high-density Nb3Al block is obtained. The method is convenient in process flow, short in period, low in energy consumption and simple in equipment, and has good process universality and large-scale expansion potential.