557 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 material processing, and discloses a preparation method of a copper-clad aluminum slot wire WIC superconducting wire, and the method comprises the steps: obtaining a to-be-processed workpiece which comprises a copper-clad aluminum rod and a copper matrix round wire; the copper-clad aluminum rod is sequentially subjected to drawing, annealing, rolling and forming, and the copper-clad aluminum groove wire is prepared; the copper-clad aluminum slot wire and the copper matrix round wire are respectively cleaned and coated with a soldering flux, and then are simultaneously immersed into a tin bath filled with tin liquor to be matched with an inlaying mold to carry out inlaying welding for at least 1000m, so that the copper-clad aluminum slot wire WIC wire is obtained; and surface layer and deep layer welding defect characterization is carried out on the obtained copper-clad aluminum slot wire WIC, and it is ensured that the number of the surface layer and the number of the deep layer welding defects of the copper-clad aluminum slot wire WIC are both zero. According to the method, inlay welding is carried out in the mode that copper-clad aluminum is matched with dip soldering, and the problems that in the traditional technology, the labor cost is high, the welding quality is not stable, and the productivity is insufficient can be solved at the same time.

The invention belongs to the technical field of superconducting wires, and relates to an aluminum slot wire WIC superconducting wire and a preparation method thereof. The invention provides a preparation method of an aluminum slot wire WIC superconducting wire, and the method comprises the steps: selecting a workpiece according to a preparation technology of the aluminum slot wire WIC superconducting wire, and the workpiece comprises an aluminum slot wire, a superconducting round wire and two rolls of soldering round wires; the superconducting round wire is arranged in the groove of the aluminum slot wire in a threading mode, then the two rolls of soldering tin round wires are symmetrically embedded into the groove between the aluminum slot wire and the superconducting round wire, and finally the aluminum slot wire WIC superconducting wire is obtained through induction heating and online tin melting. The method solves the technical problems that a conventional preparation method of the aluminum slot wire WIC superconducting wire is low in production efficiency, multiple in wire soldering tin filling unevenness defect, low in RRR value and the like.

The invention discloses a preparation method of a slot wire for a superconducting wire. The preparation method comprises the following steps: manufacturing a copper bar into a copper flat wire through a drawing process; soaking the copper flat wire in a soldering flux, and then washing and air-drying the copper flat wire to obtain a prefabricated copper flat wire; combining the plurality of prefabricated copper flat wires according to the cross section structure of the superconducting wire; performing induction heating welding on the plurality of combined prefabricated copper flat wires through a welding mold to obtain a copper groove wire; performing water cooling, cleaning and drying on the copper slot wire to obtain a copper slot wire with a clean surface; and screening the copper slot line through a laser diameter measuring instrument and eddy current flaw detection equipment to obtain a copper slot line finished product. The copper slot wire with the groove in the surface is obtained by welding the copper flat wire, integrated forming of the structural slot wire is achieved, the production efficiency is improved, welding and finishing forming are carried out by designing dies of different structures, the surface quality of the copper slot wire is improved, the slot wire of a high-precision complex structure is obtained, the drawing speed is high, and the production cost is low. And large-scale production of the copper slot line is facilitated.

The invention discloses a preparation method of a Nb3Sn superconducting wire for a light-emitting device and the Nb3Sn superconducting wire, and relates to the technical field of superconducting, and the method comprises the following steps: depositing a rare earth element film on the surface of a SnTi alloy rod to obtain a first rare earth element alloy rod; a hole is drilled in the center of the first rare earth element alloy rod, a CuTa alloy rod is inserted, and a second rare earth element alloy rod is obtained; the second rare earth element alloy bar is inserted into the inner tin method Ni3Sn CuNb composite pipe, and an inner tin method Ni3Sn subcomponent is obtained; a plurality of inner tin method Ni3Sn subcomponent clusters are loaded into a Ta tube and an oxygen-free copper tube, and an inner tin method Ni3Sn final blank is obtained; and stretching the internal tin method Ni3Tin final blank to obtain the Ni3Tin superconducting wire. The rare earth element film is deposited on the surface of the SnTi alloy bar, the application range of the Nb3Sn superconducting wire is expanded, and due to the existence of the CuTa alloy bar, the tensile strength of the wire is stable after the heat treatment process, and wire damage caused by collision is prevented.

The invention belongs to the technical field of superconducting wires, and discloses a Ni3Sn superconducting wire with a stable RRR value and a preparation method of the Ni3Sn superconducting wire. An oxygen-free copper rod, a Ta sheet and a thin-wall oxygen-free copper sheath are prepared into a Cu / Ta / Cu composite tube, meanwhile, subcomponents are densely arranged and loaded into a Ta barrier layer, then the Ta barrier layer is loaded into the prepared Cu / Ta / Cu composite tube, a final Nb3Sn blank with a double-layer Ta structure is obtained, and the Nb3Sn superconducting wire is prepared through multiple times of stretching. According to the invention, a double-Ta barrier layer structure in the Nb3Sn superconducting wire is realized, and the risk that an original single Ta barrier layer structure is broken in a stretching process to cause diffusion of Sn to a copper stable layer and reduce the RRR value of the wire is reduced. Compared with a traditional single-layer Ta tube superconducting wire, the RRR value of the Nb3Sn superconducting wire prepared through the method is obviously increased, and the Nb3Sn superconducting wire is more stable.

The invention provides a high-temperature superconducting rotor local hot spot eliminating device for circulating cold helium, and relates to the technical field of superconducting synchronous phase modifiers, the high-temperature superconducting rotor local hot spot eliminating device comprises a supporting sleeve, six sets of superconducting coil assemblies are uniformly installed in the circumferential direction of the supporting sleeve, and each set of superconducting coil assembly comprises a step core block fixedly connected to the surface of the supporting sleeve. Three double-layer superconducting wire plates are uniformly arranged on two sides of the stepped core block, and each double-layer superconducting wire plate is fixedly connected with a runway type superconducting coil. The annular guide rail driving mechanism drives the driving wheel to rotate and cooperates with the driven wheel to drive the transmission belt to rotate, that is, the transmission belt drives the movable cold guide plate to rotate along the runway type sliding rail and move to the local hot spot generation position to exchange heat with the movable cold guide plate. According to the invention, the purpose of cooling local hot spots is achieved, and the problems of local temperature rise and local quenching of the magnet are avoided.

The invention discloses an NbTi / Cu superconducting wire copper ratio test system and method based on image recognition. The method comprises the following steps: S1, collecting metallographic image data of a sample NbTi / Cu superconducting wire cross section and obtaining a real copper ratio through a density method; s2, obtaining a calculation copper ratio according to the number of pixel points of the binarized image; S3, taking the metallographic image data, the real copper ratio and the calculation copper ratio as a data set, and training a support vector regression model by using the data set; and S4, obtaining a cross-section image of the NbTi / Cu superconducting wire to be tested, and inputting the cross-section image and the calculated copper ratio obtained by the step S2 into the support vector regression model in the step S3 to obtain an actual copper ratio. The invention belongs to the field of superconducting composite wires, and solves the problems of low efficiency of a paper-cut method, inaccurate copper ratio result and tedious operation process of a density method in the current copper ratio test method. According to the invention, the accuracy of the copper ratio test is ensured, and the efficiency is improved.

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 invention discloses a processing method for controlling the copper ratio of a superconducting wire, and relates to the technical field of superconducting wire processing, comprising the following steps: acquiring a superconducting wire to be processed; carrying out on-line copper ratio test to obtain a copper ratio change trend and a copper ratio fluctuation range; carrying out coreless lathe scaling according to the copper ratio change trend to obtain a superconducting wire to be processed with fluctuating size; finishing the to-be-processed superconducting wires with fluctuating sizes to a uniform size by using a mold; repeating the online copper ratio test, the coreless lathe peeling and the die finishing until the copper ratio fluctuation range meets the copper ratio fluctuation requirement, and obtaining a superconducting wire in a first fluctuation range; and processing the superconducting wire in the first fluctuation range to a designed copper ratio to obtain a final superconducting wire. On-line copper ratio testing is matched with centreless lathe scaling, so that the copper ratio fluctuation of the superconducting wire is reduced, and the copper ratio uniformity and the performance stability are improved; and non-uniform copper ratio areas at the head and the tail of the wire can be fully utilized, and the yield of the wire is improved.

The invention discloses a hot forming preparation method of a high-temperature superconducting MgB2 wire rod based on resistance heating. The method comprises the following steps: 1, carrying out cold rotary swaging deformation after tubing to obtain a single-core complex; 2, after resistance heating, carrying out hot drawing deformation to obtain a single-core composite round wire; thirdly, the single-core composite round wires are bundled and assembled and then subjected to cold rotary swaging, and a multi-core bundled and assembled complex is obtained; 4, after resistance heating, carrying out hot drawing deformation to obtain a multi-core clustered composite MgB2 round wire; and 5, carrying out vacuum heat treatment to obtain the high-temperature superconducting MgB2 wire rod. Resistance heating is carried out before hot drawing deformation, so that the center Mg rod and the middle Nb barrier layer obtain excellent thermoplasticity, coordinated and uniform plastic deformation of the center Mg rod and the middle Nb barrier layer and the outer Cu sheath and uniform flowing of filled powder are achieved, and the MgB2 superconducting wire which is free of knots on the surface, free of core breakage in the interior and uniform in deformation is obtained and is suitable for the field of high-temperature superconducting. And meanwhile, the machining pass is reduced, the machining time is greatly shortened, and the preparation process is simplified.

The invention discloses a preparation method of an MgB2 superconducting wire based on 3D printing. The preparation method comprises the following steps: printing powder B into a tube B by adopting a 3D printing technology; the Mg rod is inserted into the B pipe and integrally stuffed into the metal sheath, and a round single-core rod is machined through the rotary swaging or rolling technology; at least one anaerobic Cu rod and a plurality of circular single-core rods are inserted into an NCu30 pipe, and a multi-core complex is obtained; processing the multi-core composite body into a multi-core composite wire by adopting a drawing, rotary swaging or rolling process; and carrying out heat treatment on the multi-core composite wire to obtain the MgB2 superconducting wire. The powder B is printed into the tube B through the 3D printing technology, and the efficiency and stability of preparing the single-core rod and the overall uniformity of the wire rod are improved; and the stacking compactness of the B powder is improved, a compact MgB2 superconducting phase can be conveniently generated, and the current-carrying capacity of the wire is improved.

To suppress reduction of an electrification performance (current value) in an end structure for a superconducting cable.SOLUTION: An end structure for a superconducting cable comprises at least a multilayer conductor 10 and an electrode part 30, and the multilayer conductor 10 is configured by laminating a plurality of superconducting wires 20, each presenting a tape shape, in a thickness direction of the superconducting wire 20. The electrode part 30 includes at least a plurality of slits 40. The multilayer conductor 10 is divided into a plurality of wire units 11, and stored in the slit 40 for each wire unit 11. When storing two superconducting wires 20 in the slit 40, it is preferable that directions of faces of the superconducting wires 20 are adjusted in such a manner that faces at the sides of a superconducting layer 23 and a stabilizing layer 24 constituting the superconducting wire 20 is brought into contact with or made close to an inner wall surface of the slit 40.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of an MgB2 superconducting wire rod and the MgB2 superconducting wire rod, and relates to the technical field of superconduction, and the method comprises the steps: drilling a plurality of installation holes in an oxygen-free copper ingot, and obtaining a porous copper ingot; the Mg foil is arranged in the Nb tube; an Mg rod is inserted into the Nb tube; filling B powder between the Mg rod and the Mg foil to obtain a single-core rod; inserting the single-core rod into the mounting hole to obtain a multi-core composite ingot; carrying out rolling and cold drawing on the multi-core composite ingot to obtain a multi-core MgB2 wire rod; and carrying out heat treatment on the multi-core MgB2 wire rod to obtain the MgB2 superconducting wire rod. The Mg foil is coated between the Nb tube and the B powder, double-area Mg diffusion is formed between the Mg foil and the central Mg rod, preparation of the high-Jc MgB2 wire is facilitated, drilling is conducted on the oxygen-free copper ingot to assemble the multi-core MgB2 wire, and the problem that during secondary assembly, due to the fact that cold combination of all subcomponents is not coordinated, wire core wires deform unevenly is solved.

The invention discloses a preparation method of a multi-core Nb3Sn composite wire and the composite wire. The method comprises the following steps: loading an Nb rod into an oxygen-free copper pipe to obtain a CuNb single-core rod; the CuNb single-core rods and the hexagonal copper core rods are sequentially arranged in a CuMn alloy pipe at intervals to obtain a multi-core CuNb composite sheath, and then the multi-core CuNb composite sheath is machined into a CuNb composite rod; the CuNb composite rod is machined into a CuNb composite pipe; the SnTi alloy bar is loaded into the CuNb composite tube to obtain a sub-component; a hexagonal CuMn subcomponent is obtained through machining; the hexagonal CuMn subcomponent and the SnCu alloy bar are assembled into a Ta tube and then integrally assembled into an oxygen-free copper tube to obtain a composite wire, and the composite wire is processed to obtain the Nb3Sn superconducting wire. CuNb single core rods on the outermost layer are adjusted to be in discontinuous close arrangement, the problem that machining cracking is prone to occurring in the subcomponent preparation stage due to the fact that Cu on the outer portions of the single core rods is little is solved, the deformation consistency of the wire in the composite wire machining stage is further enhanced by using the CuMn alloy on the outer portions of the subcomponents, it is also guaranteed that the wire cannot crack when stretched, and the service life of the wire is prolonged. The fan-shaped SnCu alloy bars are additionally arranged, so that sufficient Sn is ensured when the wire Nb generates Nb3Sn.

The invention belongs to the technical field of superconducting cables, and relates to a superconducting cable, a method for preparing an insulating layer on the surface of the superconducting cable and application. The invention provides a superconducting cable which comprises a superconducting wire core and an insulating layer arranged on the surface of the superconducting wire core, and the insulating layer sequentially comprises a first spiral winding layer, a second spiral winding layer and a weaving layer from inside to outside; the direction of the first spiral winding layer is opposite to that of the second spiral winding layer. According to the superconducting cable provided by the invention, the bending resistance of the cable can be improved, and a certain compression strength can be maintained at a higher sintering temperature.

The invention belongs to the technical field of superconducting wires, and discloses a multichannel NbTi superconducting coaxial cable and a preparation method thereof. The method comprises the following steps: introducing an Hf element into NbTi alloy powder to prepare an NbTi wire doped with the Hf element, respectively preparing an NbTi flat rectangular shell and a hole-containing insulating block, assembling the NbTi flat rectangular shell and the hole-containing insulating block, and inserting the NbTi wire into the hole of the insulating block to prepare the multi-channel NbTi superconducting coaxial cable. Through verification, the multi-channel NbTi superconducting coaxial cable can transmit a plurality of high-strength quantum bit signals at the same time, and is excellent in performance.

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 belongs to the technical field of superconducting wires, and relates to a connecting structure and a connecting method of superconducting tapes and a connecting superconducting wire. The invention relates to a connecting structure of REBCO superconducting tapes. The connecting structure comprises a first REBCO superconducting tape and a second REBCO superconducting tape, the to-be-connected areas of the first REBCO superconducting tape and the second REBCO superconducting tape are in a step shape, and the splicing angle of the to-be-connected areas is an acute angle. When the REBCO superconducting tape is connected through the connecting structure of the REBCO superconducting tape, the electrical transport performance of the connector is not affected by an intrinsic weak connecting structure of the REBCO layer in the vertical direction, pressure does not need to be applied, and the connecting process is conducted in an open environment.

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 discloses a method for preparing an MgB2 superconducting wire by drilling an Mg ingot. The method comprises the following steps: drilling the Mg ingot; pressing the C-coated B powder into a bar B with uniform length; processing the placed B rod and Mg ingot into a circular single-core rod; the round single-core rod and the oxygen-free Cu rod are subjected to acid pickling treatment and then jointly put into an NCu30 pipe subjected to acid pickling treatment to be manufactured into a multi-core composite wire; and performing heat treatment on the multi-core composite wire to prepare the MgB2 superconducting wire. A hole is drilled in the Mg ingot, B powder is pressed into a B rod by a powder rod pressing machine to be stuffed into the hole, and Mg uniformly permeates into the B powder from the periphery to react, so that Mg and B react more thoroughly, the problem that the B powder is left and does not react frequently in the IMD method is avoided, the powder filling problem during preparation of the single-core rod is effectively avoided, rapid preparation of the IMD method single-core rod is realized, and the production cost is reduced. And the powder loading density of the B powder is greatly improved.

A superconducting wire connection structure includes a first superconducting wire and a second superconducting wire. The first superconducting wire has a first end portion in a longitudinal direction of the first superconducting wire. The second superconducting wire has a second end portion in a longitudinal direction of the second superconducting wire. Each of the first superconducting wire and the second superconducting wire has a base material, an intermediate layer disposed on the base material, and a superconducting layer disposed on the intermediate layer. A connection portion, which is a portion of the superconducting wire connection structure where the superconducting layer at the first end portion and the superconducting layer at the second end portion are connected, has a first sandwiching member and a second sandwiching member.

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.

The invention discloses a high-magnetic-field and high-uniformity superconducting magnet system for nuclear magnetic resonance, belongs to the technical field of nuclear magnetic resonance, and solves the problem of how to design a high-magnetic-field-intensity and high-uniformity superconducting magnet system. A high-field area in the magnet is a coil using a niobium-tin superconducting wire, and a low-field area in the magnet uses a coil using a niobium-titanium superconducting wire; the main coils are connected in series to work together, and can generate an effective central magnetic field intensity of 18.8 T when operating at a liquid helium temperature; the design uniformity of a central magnetic field can be superior to 0.01 ppm in a spherical range with the diameter of 1cm; the main magnetic field coil can shield more than 90% of external electromagnetic interference; the shielding coil can effectively control the size of a stray field of a magnet system, and a 5Gs line stray field can be limited in a 1.5 m ellipsoid and a 2.5 m ellipsoid in the radial direction and the axial direction respectively. The method is suitable for a nuclear magnetic resonance spectrometer, animal imaging, Fourier transform ion cyclotron resonance and other scenes.

The invention discloses a preparation method of a superconducting composite long wire. The preparation method comprises the following steps: smelting Cu, Mn and a copper alloy to obtain a Cu-Mn-(Cr / Fe / Zr / Ag / Ti) alloy pipe; an Nb cylinder and an NbTi rod are placed in the alloy pipe to be manufactured into a single core rod; combining the single-core rod and an oxygen-free copper rod in an oxygen-free copper pipe to obtain a secondary composite rod; combining the secondary composite rod and an oxygen-free copper rod in an oxygen-free copper pipe to obtain a third composite rod; and carrying out drawing treatment on the tertiary composite rod to obtain a tertiary superconducting composite wire. The alloy resistive matrix is obtained in an alloying mode, the long-line machining capacity of the copper-manganese-based niobium-titanium superconducting wire is improved under the condition that critical current density and alternating-current loss are not reduced, the oxidation resistance of a single-core rod is obviously improved, the thickness of an oxide layer after hot extrusion is obviously reduced, the scaling frequency is effectively reduced in the machining process, and the service life of the single-core rod is prolonged. The deformation uniformity of the superconducting core wire can be effectively improved, so that the critical current density is improved, and the efficiency and cost can be improved.

The invention belongs to the technical field of superconducting material detection, and particularly relates to a superconducting wire torque measuring method. The invention discloses a superconducting wire torque measuring method, which comprises the following steps of: annealing a superconducting wire to be detected in an annealing furnace, spraying paint on the surface of the superconducting wire, rolling the superconducting wire, removing paint, and measuring the distance between threads on the surface of a bare wire. And calculating the torque of the superconducting wire according to the distance between the threads, the number of core wires on the outermost layer of the wire and the length of the wire before and after rolling. The torque of the wire rod is measured according to the hardness difference between the superconductor and the base body. The method is simple to operate, wide in application range and high in measurement precision.