337 results about "Superconducting wire" patented technology

The invention discloses a method for improving deformation uniformity of a core wire of an NbTi superconducting wire, and belongs to the technical field of superconducting wire processing. The method comprises the following steps: performing deep hole drilling on an oxygen-free copper ingot rod, then assembling, welding and extruding the oxygen-free copper ingot rod and a single-core rod to obtain a composite rod, and performing multi-pass drawing on the composite rod to obtain the NbTi superconducting wire with high performance, low loss and high N value. The Jc of the prepared NbTi superconducting wire is 2880-3120 A / mm < 2 >, the loss is 450-550 mJ / cm < 3 >, the N value is 70-95, compared with a superconducting wire prepared through a conventional process, the N value is remarkably increased, the loss is remarkably reduced, the critical current density is increased, and the NbTi superconducting wire has wide application prospects in MRI magnets.

The invention belongs to the technical field of superconducting wires, and relates to a niobium-tin composite superconducting wire and a preparation method thereof. The invention provides a Nb3Sn composite superconducting wire. The Nb3Sn composite superconducting wire sequentially comprises an Nb3Sn superconducting wire core, a barrier layer, a stable layer, a transition layer, a substrate layer and a functional layer from inside to outside, the transition layer is formed by mixing copper and a dielectric polymer, and the copper content is continuously decreased in a gradient manner from inside to outside; the substrate layer is the dielectric polymer; the functional layer is a plurality of protruding metal microstructures. According to the invention, the functional layer with the broadband electromagnetic stealth function is integrated on the basis of the Nb3Sn superconducting wire rod, so that the radar cross section is obviously reduced while the Nb3Sn superconducting wire rod bears high-density superconducting current and generates a strong magnetic field, and the technical problem that a high-field superconducting magnet system is easy to detect in an electromagnetic environment is solved.

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 discloses a superconducting wire performance testing device which is characterized by comprising a sample rod, a conductor critical current testing framework, a conductor mechanical performance testing framework and a Dewar. During performance testing, the sample rod and the conductor critical current testing framework are detachably connected and located in the Dewar; or the sample rod and the conductor mechanical property testing framework are detachably connected and located in the Dewar. The testing device provided by the invention can be used for both critical current testing and mechanical performance testing.

The invention relates to the field of superconducting wire forming methods, in particular to a Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing, and the Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing comprises the following steps: preparing ultrahigh-tin-content copper-tin alloy powder by adopting a gas atomization method; the oxygen-free copper pipe, the oxygen-free copper rod and the pure niobium rod are machined, and the oxygen-free copper pipe and an oxygen-free copper bolt plug are obtained; acid pickling, cleaning and drying are carried out; uniformly fixing the pure niobium rods in the oxygen-free copper pipe to form a combined blank; performing rotary swaging to a required size, and then continuously drawing to obtain a finished wire; carrying out pulse treatment, and then carrying out air cooling to room temperature; and finally obtaining the Nb3Sn superconducting wire. According to the method, the strength and plasticity of the oxygen-free copper pipe sheath are improved through a liquid nitrogen cold drawing method, the combined blank is subjected to subzero treatment in the rotary swaging and drawing process, the plasticity of the combined blank is improved, and the high-strength and high-plasticity Ni3Sn superconducting wire can be obtained.

The invention belongs to the technical field of superconducting cables, and discloses a superconducting cable, a preparation method and a preparation device.The preparation method of the superconducting cable comprises the steps that a core wire, X superconducting wires and Y carbon fibers are prepared, the X superconducting wires and the Y carbon fibers are used for being woven on the surface of the core wire, and Y is smaller than or equal to X; spirally winding a hot melt adhesive film on the surfaces of the Y carbon fibers; the core wire, the superconducting wires and the carbon fibers are woven in a heating environment, and the X superconducting wires and the Y carbon fibers wound with the hot melt adhesive films are woven on the surface of the core wire under the heating condition; cooling the heated and braided superconducting cable through conveying; and after cooling, wrapping an insulating layer outside the superconducting braid layer formed by the superconducting wires and the carbon fibers. In conclusion, the superconducting braid layer of the superconducting cable is formed by mixing and weaving the superconducting wires and the carbon fibers, and the hot melt adhesive film is spirally wound on the surfaces of the carbon fibers, so that the core wires, the superconducting wires and the carbon fibers are bonded with one another after weaving, and the structural strength of the whole cable is improved.

The invention discloses a superconducting connector for a star simulator and a superconducting cable assembly. The superconducting connector comprises a supporting seat, a connector guide seat and a clamping assembly which are fixedly connected in sequence in the length direction of the superconducting connector. A first boss and a second boss are arranged on the supporting seat in a spaced mode in the extending direction perpendicular to the length direction, a through hole is formed in each boss in the first boss and the second boss, a first guide hole and a second guide hole are formed in the connector guide seat in a spaced mode, and the clamping assembly comprises a first sleeve and a second sleeve which are arranged in the extending direction in a spaced mode. According to the superconducting connector, when the first superconducting cable and the second superconducting cable are electrically connected, the first cable connecting part and the second superconducting cable connecting part are jointly limited by the supporting seat, the guide seat and the clamping assembly, so that the risks of deviation, hinging and disconnection of the connecting position of the first superconducting cable and the second superconducting cable are reduced; therefore, current can be stably conducted between the first superconducting cable and the second superconducting cable.

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.

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 present invention provides: a MgB2 superconducting wire that has a barrier layer of highly uniform thickness covering a MgB2 core and that reduces MgB2 filament defects and is suitable for thinning and lengthening; a MgB2 superconducting wire manufacturing method for manufacturing the same; a superconducting coil using the same; and a magnetic generator including the superconducting coil. A MgB2 superconducting wire (200) comprises: a core material (210); a MgB2 filament (220) in which a MgB2 core (221) is covered with a barrier layer (222); and a metal sheath (230). The MgB2 filament (220) has a barrier layer (222) thickness on the outer peripheral side of the wire not more than three times the barrier layer (222) thickness on the core side of the wire. The method for manufacturing the MgB2 superconducting wire includes a step for forming a single core wire, a step for forming an embedded material, a surface reduction processing step, and a heat treatment step. The embedded material is formed by arranging the single core wire in a recess formed in the outer surface of the core material or by incorporating a spacer in a gap.

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 discloses a ductile niobium-titanium alloy material, a preparation method and application of the ductile niobium-titanium alloy material to preparation of a central conductor. The ductile niobium-titanium alloy material comprises, by weight, 44.5%-47.5% of Nb, 47.0%-50.0% of Ti, 1.0%-2.0% of Zr, 0.8%-2.0% of Mo, 0.2%-0.6% of V, 0.1%-0.3% of Al, 0.05%-0.12% of Si, 0.015%-0.025% of C, smaller than or equal to 0.035% of O, smaller than or equal to 0.01% of N, smaller than or equal to 0.25% of Fe + impurities and the balance Ti. The preparation process comprises the steps of double-vacuum melting, double-stage pre-homogenization heat treatment, gradient temperature control thermal machining and double-stage aging heat treatment, a fine grain beta matrix + dispersed alpha phase + nano MC carbide synergistic strengthening structure is obtained, and 3-10% of metastable beta phase is reserved. The central conductor made of the material has longitudinal and transverse absorption energy of not less than 180 J / cm and not less than 178 J / cm at-273 DEG C, longitudinal and transverse performance difference of not more than 8%, yield strength of not less than 780 MPa, salt spray corrosion resistance of not less than 1000 hours, and no obvious corrosion, and is suitable for manufacturing the central conductor of the low-temperature superconducting wire.

The invention discloses a preparation method of Bi-2212 precursor powder capable of remarkably improving the phase density of Bi-2201 nanometer stripes in a Bi-2212 wire rod, and the Bi-2212 precursor powder capable of remarkably improving the phase density of the Bi-2201 nanometer stripes in the Bi-2212 wire rod is obtained by controlling the components of a precursor solution, adjusting in cooperation with a fine heat treatment method and controlling the molar ratio of Sr to Ca. According to the method disclosed by the invention, the components of the precursor solution are controlled, the large-size Bi-2201 phase is eliminated in combination with heat treatment, and the molar ratio of powder Sr to Ca is controlled to be within a proper range, so that the density of the nano stripe Bi-2201 phase in the Bi-2212 wire rod is improved, and the pinning performance of the Bi-2212 wire rod is favorably improved; the method is easy to operate, low in cost and high in controllability and operability, the cost performance of the Bi-2212 superconducting wire is improved, and rapid application of the Bi-2212 superconducting wire in the field of high-temperature superconducting magnets is further promoted.

The invention provides a niobium rod for an Nb3Sn superconducting wire niobium material and a preparation method of the niobium rod, and the preparation method of the niobium rod comprises the following steps: a, upsetting and drawing forging: carrying out n times of upsetting and drawing forging on a niobium cast ingot, n is any integer in 2-5, and carrying out annealing heat treatment in a gap between two times of upsetting and drawing forging or after the last upsetting and drawing forging, the upsetting and drawing forged round bar is obtained; b, radial forging is conducted, specifically, the upsetting and drawing forging round bar is subjected to radial forging; and c, rotary forging: carrying out rotary forging on the rod blank subjected to radial forging. The niobium rod prepared by the method meets one or more of the following items: the grain size is 7-8 grades, the elongation at break is greater than or equal to 40%, and the hardness (HV / 2.9 N) is greater than or equal to 40 and less than or equal to 65. Namely, the niobium rod prepared by the preparation method has at least one of the characteristics of uniform and fine grains, low hardness and high plasticity, and the comprehensive performance of the niobium rod is improved, so that the strict requirements of the Nb3Sn superconducting wire on the base material in high-field magnet application are met.

A superconducting coil comprises a superconducting wire, an insulating sheet, and an adhesive resin. The insulating sheet includes a plurality of resin sheets and two semi-cured resin fiber sheets. The plurality of resin sheets have electrical insulation and are disposed in at least two layers. The two semi-cured resin fiber sheets are disposed in layers with the plurality of resin sheets disposed therebetween. The plurality of resin sheets and the two semi-cured resin fiber sheets have mutually adjacent resin and semi-cured resin fiber sheets bonded together.

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 present invention relates to a high-temperature superconducting magnet and, more specifically, to: a high-temperature superconducting magnet achieving uniform critical current density using dissimilar metal wire materials; and a design parameter determination method thereof. To this end, in a high-temperature superconducting (HTS) magnet (100) formed by stacking an HTS coil (50) having a tape-type HTS conductor wire material wound thereon, the HTS coil (50) comprises: a first metal wire material (110) wound on the HTS coil (50); and a second metal wire material (130) that is made of a different metal from the first metal wire material (110) and wound while at least partially overlapping the first metal wire material (110) in the longitudinal direction of the first metal wire material (110), thereby forming a composite winding portion (140). Accordingly, the HTS magnet achieving uniform critical current density using dissimilar metal wire materials is provided, wherein the uniformity of the critical current density increases on the longitudinal cross-section of the HTS magnet (100).

A superconducting coil has a superconducting wire (3), an insulating sheet (4), and an adhesive resin (5). The insulating sheet (4) includes a plurality of resin sheets and two sheets of semi-cured resin fiber sheet (7). The plurality of resin sheets have electrical insulation and are laminated with at least two or more layers. The two sheets of semi-cured resin fiber sheet (7) are laminated in a manner that the plurality of resin sheets are sandwiched between each other. In the plurality of resin sheets and the two sheets of semi-cured resin fiber sheet (7), the resin sheets and the semi-cured resin fiber sheet (7) that are adjacent to each other are engaged with each other.

To provide a superconducting coil that can easily improve its performance such as insulating characteristics.SOLUTION: A superconducting coil of an embodiment comprises a winding member in which a superconducting wire is wound around a winding axis. The superconducting wire has a superconducting wire body part, and an insulating coating layer formed of an insulating material so as to cover the surface of the superconducting wire body part. The insulating coating layer is formed on the surface of the superconducting wire body part so as to include at least a portion interposed between the turns of the superconducting wire.SELECTED DRAWING: Figure 2

The application relates to a magnetic resonance device, a superconducting shimming coil and a manufacturing method thereof. The superconducting shimming coil comprises a winding drum, the winding drum is provided with a saddle-shaped winding groove group, the winding groove group comprises a plurality of layer-by-layer sleeved winding grooves, and each winding groove is in a closed shape; and a superconducting wire is arranged in the winding groove. By fixing the superconducting wire in the winding groove of the winding drum, the winding process of the superconducting wire is simplified, the manufacturing of the superconducting shimming coil can be directly realized by fixing the superconducting wire in the winding groove, the superconducting wire does not need to be bent during winding and can be directly placed in the winding groove, the operation is convenient, the manufacturing of the superconducting shimming coil is facilitated, meanwhile, the superconducting wire can generate a uniform main magnetic field during work, the service performance of the magnetic resonance device is guaranteed, and the accuracy of an imaging result is further guaranteed.

Provided is a superconducting wire. The superconducting wire comprises a substrate, a superconducting film on the substrate and a pinning center in the superconducting film. The superconducting film includes Y1-xRExBCO and the pinning center has an additive of Ba2YNbO6.

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.

The present invention discloses an integrated sample rod processing device for superconducting wire Ic testing and its use method. The integrated processing device includes an operating table primarily constructed from a support frame and a panel. The panel is divided from left to right into a drying area, a storage area, and a welding area, according to the sample rod loading process. A drying actuator, a storage mechanism, a welding actuator, and a control mechanism are mounted on the operating table corresponding to each area. Through this integrated processing device, the present invention not only improves the efficiency of sample rod loading and the automation level of the sample rod drying, storage, and welding process during low-temperature superconducting wire testing, but also improves the working environment of each sample rod loading step, ensuring the health of test personnel. It also prevents sample rod contamination that could affect test precision and accuracy, thereby advancing the development of equipment for superconducting wire production.

This Nb3Sn superconducting wire precursor comprises a cylindrical stabilized copper layer, a cylindrical first Sn diffusion barrier layer provided inside the copper layer, and a superconducting element group precursor housed inside the barrier layer. The superconducting element group precursor includes a plurality of Sn-based reinforced element wires and a plurality of Nb-based superconducting element wire precursors. The reinforced element wires include a Cu or Cu-based alloy first stabilization matrix, a plurality of Sn-based filaments that are Sn or Sn-based alloys and that are embedded in the first stabilization matrix, and a plurality of reinforcement-material multi-core wires that are configured from a plurality of metal or alloy-made reinforcement filaments. The wire precursors comprise a second stabilization matrix of Cu or a Cu-based alloy, and an Nb-based superconducting filament precursor that is Nb or an Nb-based alloy and that is embedded in the second stabilization matrix.

The application provides a current lead joint structure and a welding method thereof, and the structure comprises a current lead, a fixing component, a superconducting wire and solder; the first end of the current lead is provided with a groove along the axial direction of the current lead; the fixing component is a U-shaped plate structure matched with the groove, and the fixing component is inverted in the groove to form a tubular structure with open ends; the first section of the superconducting wire is a superconducting bare wire with a wrapping layer removed, and the second section is a superconducting bus with a wrapping layer not removed; the superconducting bare wire is arranged in the tubular structure, and the superconducting bus is arranged outside the tubular structure; the solder is laid in the tubular structure and completely immerses the superconducting bare wire; the superconducting bare wire, the first end of the current lead and the solder are fused into one by heating and cooling the solder, so as to realize the welding of the superconducting wire and the current lead. The application can solve the technical problems of the current lead joint structure in the prior art, such as large welding point contact resistance, local hot spot hidden danger and difficult disassembly.

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.

The invention discloses a hot drawing preparation method of a high-temperature superconducting MgB2 wire based on center MgLi diffusion, which comprises the following steps of: 1, placing an Nb tube in a Cu tube, placing an MgLi alloy rod in the Nb tube, filling carbon-coated B powder or B powder between the MgLi alloy rod and the Nb tube, and carrying out cold rotary swaging to obtain a single-core complex; secondly, head rotating, outer layer graphite coating and hot drawing are sequentially carried out, and a single-core composite round wire is obtained; thirdly, the single-core composite round wires are bundled and assembled in a Monel alloy sheath, and cold rotary swaging, outer-layer graphite coating and hot drawing are carried out; and 4, performing vacuum heat treatment to obtain the high-temperature superconducting MgB2 wire rod. According to the method, the MgLi alloy rod serves as the center and is combined with the Nb pipe, the Cu pipe and the B powder to obtain the single-core complex, the excellent hot working capacity is obtained through hot drawing, cold rotary swaging and other treatment, the uniformity of synergistic deformation is improved, and the method is suitable for the technical field of superconducting wire preparation and machining.

The invention discloses a preparation method of a high-stability bronze-process niobium-tin wire, and relates to the technical field of superconducting wire preparation, and the preparation method comprises the following steps: assembling a composite ingot according to a composite structure which sequentially comprises an outer copper matrix, an outer barrier layer, a bronze-based CuNb layer, an inner barrier layer and an inner copper matrix from outside to inside; the composite ingot is sequentially subjected to heat preservation extrusion and multi-pass cold drawing, and a composite wire is obtained; carrying out heat treatment on the composite wire to obtain a Ni3Sn wire; the outer blocking layer and the inner blocking layer are made of Nb or Ta or Nb alloy or Ta alloy or Ta / Nb alternating composite layers. The Ni3Sn wire is prepared by designing a composite structure with double barrier layers and combining heat preservation extrusion, multi-pass cold drawing and heat treatment, the critical current density and the residual resistance ratio of the wire are increased, and then the stability of the wire is improved.