CN117476286B - Preparation method of NbTi superconducting wire with high critical current density - Google Patents
Preparation method of NbTi superconducting wire with high critical current density Download PDFInfo
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- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/06—Films or wires on bases or cores
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention belongs to the technical field of superconducting materials, and discloses a preparation method of a high critical current density NbTi superconducting wire. The preparation method comprises the following steps: alternately winding NbTi foil and Nb foil on the surface of the Nb rod to prepare the Nb rod with a plurality of layers of NbTi foil and Nb foil coated on the surface; placing the Nb rod with the surface coated with a plurality of layers of NbTi foils and Nb foils in an oxygen-free copper sheath with an Nb cylinder barrier layer, and welding after capping to obtain an NbTi/Cu composite ingot; performing hydrostatic extrusion on the NbTi/Cu composite ingot to obtain an NbTi/Cu composite rod; and carrying out multi-pass cold drawing on the NbTi/Cu composite rod, and carrying out multiple ageing heat treatments in the cold drawing process to obtain the NbTi superconducting wire. The invention adopts the mode of alternately coating the NbTi foil and the Nb foil to successfully prepare the NbTi superconducting wire with high critical current density, so that the NbTi superconducting wire can be used in a high field (H is more than 10T).
Description
Technical Field
The invention belongs to the technical field of superconducting materials, and discloses a preparation method of a high critical current density NbTi superconducting wire.
Background
NbTi/Cu superconducting wire is widely used in large-scale superconducting magnets such as Magnetic Resonance Imaging (MRI), nuclear magnetic resonance wave (NMR), magnetic control pulling single crystal silicon (MCZ), international thermonuclear fusion reactor (ITER), and Chinese Fusion Engineering Test Reactor (CFETR) due to excellent metal processing characteristics. The composition of NbTi alloy is typically between Nb-46wt.% Ti and Nb-50wt.% Ti, nbTi superconducting alloy with Ti content in this range has both higher critical temperature and higher upper critical field, commercial NbTi alloy is Nb47 wt.% Ti, upper critical magnetic field at critical temperature of 9.6K,4.2KH c2 11T, and 14T for 2K.
The NbTi/Cu superconducting wire is successfully developed by perfectly combining NbTi alloy and high-purity oxygen-free copper, the alternating current loss of the wire is reduced by multiple assembly core wire fine-cored and twisting, and meanwhile, a large amount of alpha-Ti is separated out to improve the critical current density of the wire along with multiple ageing heat treatment in the processing process. The critical current density is highest when the α -Ti size in the NbTi alloy, which acts as a flux pinning, is comparable to the NbTi lattice constant (about 5 nm). Along with the gradual increase of the magnetic field requirement of MRI equipment, development of a preparation method of the NbTi superconducting wire with high critical current density under high field is urgently needed, and the requirement of high-field MRI on the NbTi superconducting wire is met.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a preparation method of a high critical current density NbTi superconducting wire. The research shows that the critical current density can be further improved by introducing an Artificial Pinning Center (APC), the limit of the traditional multiple aging heat treatment process is broken through, and any volume ratio, distribution and geometric shape between the pinning center and the NbTi superconductor can be obtained by artificial design, so that the critical current density of the wire rod is improved, and the wire rod can be used in a high field (H is more than 10T).
In one aspect, the present invention relates to a method for preparing a high critical current density NbTi superconducting wire, comprising: alternately winding NbTi foil and Nb foil on the surface of the Nb rod to prepare the Nb rod with a plurality of layers of NbTi foil and Nb foil coated on the surface;
placing the Nb rod with the surface coated with a plurality of layers of NbTi foils and Nb foils in an oxygen-free copper sheath with an Nb cylinder barrier layer, and welding after capping to obtain an NbTi/Cu composite ingot;
performing hydrostatic extrusion on the NbTi/Cu composite ingot to obtain an NbTi/Cu composite rod;
and carrying out multi-pass cold drawing on the NbTi/Cu composite rod, and carrying out multiple ageing heat treatment in the multi-pass cold drawing process to obtain the NbTi superconducting wire.
In the preparation method of the NbTi superconducting wire rod with high critical current density, nbTi thin plates with the thickness of 3-4 mm are rolled for multiple times, the rolling pass processing rate is controlled to be 5-10%, the cumulative deformation in the rolling process exceeds 60%, stress relief annealing is carried out at 700-800 ℃, and finally the NbTi foil is prepared by recrystallization annealing at 900-1000 ℃;
and (3) carrying out multi-pass rolling on the Nb sheet with the thickness of 3-4 mm, controlling the rolling pass working rate to be 5-10%, carrying out stress relief annealing at 900-1000 ℃ when the accumulated deformation in the rolling process exceeds 60%, and finally carrying out recrystallization annealing at 1100-1200 ℃ to obtain the Nb foil.
In the method for preparing the high critical current density NbTi superconducting wire provided by the invention, the number of layers of NbTi foil and Nb foil in the Nb rod coated with multiple layers of NbTi foil and Nb foil is not higher than 10 in total. In the actual winding process, the number of NbTi foil and Nb foil is more than 10, wrinkles are easily generated in the winding process, the assembly difficulty is greatly increased, the problems of poor deformation and wire breakage of the subsequent composite wire processing tissue are caused, meanwhile, the number of layers is too large, the diameter is larger after winding, the sheath size is larger, and the isostatic pressing cannot be completed.
Further, in the preparation method of the NbTi superconducting wire with high critical current density, the thickness of the NbTi foil is 0.1 mm-0.3 mm;
the thickness of the Nb foil is 0.04 mm-0.06 mm;
the size of the Nb rod is phi 5 mm-phi 8mm;
the Nb cylinder barrier layer is prepared by rolling a niobium plate with the thickness of 0.5 mm-0.6 mm, and the length of a lap joint part in the rolling is 5 mm-10 mm;
and the assembly gap between the Nb rod coated with the multi-layer NbTi foil and the Nb foil and the oxygen-free copper sheathing with the Nb barrel barrier layer is 0.5 mm-1.0 mm. The Nb foil is used as an APC pinning center, when the initial thickness is about 0.3 times of that of the NbTi foil through theoretical calculation, the composite wire is stretched to a final specification, and the Nb artificial pinning center can be effectively used as a pinning phase, so that the critical current density of the wire is improved to the greatest extent.
Further, in the preparation method of the high critical current density NbTi superconducting wire provided by the invention, parameters of hydrostatic extrusion are set as follows: the extrusion ratio is controlled to be 15-20, the extrusion temperature is controlled to be 800-900 ℃, the extrusion speed is controlled to be 5-8 mm/s, and the extrusion die size is controlled to be phi 10-20 mm.
Further, in the preparation method of the NbTi superconducting wire rod with high critical current density, the processing rate of each pass in the multi-pass cold drawing is 10% -30%;
in the multiple ageing heat treatment, the temperature of each ageing heat treatment is 500-800 ℃ and the time is 50-100 h;
in another aspect, the present invention relates to an NbTi superconducting wire produced by the above-described method for producing an NbTi superconducting wire having a high critical current density.
On the other hand, the invention relates to the application of the preparation method of the high critical current density NbTi superconducting wire in improving the critical current density of the NbTi superconducting wire.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects or advantages:
(1) Firstly, nbTi foil and Nb foil are prepared by adopting an NbTi sheet and an Nb sheet through multi-pass rolling, then uniformly distributed multi-layer NbTi foil and Nb foil are wound on the surface of an Nb rod, finally, the Nb foil and Nb foil are assembled in an oxygen-free copper sheath with an Nb barrel barrier layer, and NbTi superconducting wires with high critical current density are successfully prepared through vacuum welding, hydrostatic extrusion and cold drawing combined with multiple ageing heat treatment, so that the demands of high-field MRI on the NbTi superconducting wires are met, and domestic blank is filled.
(2) According to the invention, the NbTi/Cu composite rod is subjected to multi-pass cold drawing, multiple ageing heat treatments are performed on different specifications, the NbTi foil is subjected to cold drawing and multiple ageing to separate out a large amount of alpha-Ti, meanwhile, the microscopic size of the Nb foil in the manual pinning center is thinned, more magnetic flux pinning centers are generated, the magnetic flux pinning force is improved, and finally the NbTi/Cu composite wire with high critical current density is obtained.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional design drawing of an assembled structure of an NbTi/Cu composite ingot of the invention.
FIG. 2 is a longitudinal section design drawing of an NbTi/Cu composite ingot assembly structure of the invention.
The reference numerals are explained as follows: 1. an oxygen-free copper tube; 2. nb barrel barrier; 3. alternately laminated NbTi foil and Nb foil; 4. nb bar; 5. a jacket upper cover; 6. a sheath cylinder; 7. and a lower cover of the sheath.
Detailed Description
The following describes the technical aspects of the present invention with reference to examples, but the present invention is not limited to the following examples.
The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available unless otherwise specified.
The invention provides a preparation method of a high critical current density NbTi superconducting wire, which is implemented according to the following steps:
step 1: nbTi foil and Nb foil are prepared by multi-pass rolling of NbTi sheet and Nb sheet, stress relief annealing is carried out for 1-2 times in the rolling process, coiling is carried out for high-temperature recrystallization annealing after the final product size is rolled, and finally, the required size is cut to length.
The initial thickness of the NbTi sheet and the initial thickness of the Nb sheet before rolling are controlled to be 3-4 mm, the rolling pass processing rate is controlled to be 5-10%, the accumulated deformation amount in the rolling process exceeds 60%, intermediate stress relief annealing is needed, the stress relief annealing temperature of the NbTi sheet is 700-800 ℃, the stress relief annealing temperature of the Nb sheet is 900-1000 ℃, the recrystallization annealing temperature of the final finished NbTi foil is 900-1000 ℃, and the recrystallization annealing temperature of the Nb foil is 1100-1200 ℃.
Step 2: the cleaned fixed-length NbTi foil and Nb foil are alternately laid layer by layer, then are wound on the surface of the central Nb rod, the end surface is ensured to be flush in the winding process, and the NbTi foil and the Nb foil are prevented from being wrinkled.
The thickness of the NbTi foil is controlled to be 0.1 mm-0.3 mm, the thickness of the Nb foil is controlled to be 0.04 mm-0.06 mm, the size of the central Nb rod is controlled to be phi 5 mm-phi 8mm, and the number of layers of the NbTi foil and the Nb foil is controlled to be within 10 layers.
Step 3: and (3) mounting the rolled and cleaned Nb barrel barrier layer into an oxygen-free copper pipe, mounting the rolled NbTi foil and the Nb foil into the Nb barrel, fitting an upper cover and a lower cover, and performing vacuum electron beam welding to obtain the NbTi/Cu composite ingot.
The Nb tube barrier layer is formed by rolling a Nb plate with the thickness of 0.5 mm-0.6 mm, the length of the lap joint part after the Nb tube is rolled is controlled to be 5 mm-10 mm, the assembly gap between the Nb tube and the rolled NbTi foil and the Nb foil is controlled to be 0.5 mm-1.0 mm, the NbTi foil and the Nb foil are prevented from being wrinkled due to extrusion of excessive hydrostatic pressure in the gap, and the whole assembly process is required to be carried out in a clean room with constant temperature, constant humidity and constant dust particles.
Step 4: and carrying out hydrostatic extrusion on the welded NbTi/Cu composite ingot to obtain the NbTi/Cu composite rod, and carefully cleaning the surface of the sheath before hydrostatic extrusion to avoid introducing foreign matters into a high-pressure medium.
The extrusion ratio of the NbTi/Cu composite ingot is controlled to be 15-20, the extrusion temperature is controlled to be 800-900 ℃, the extrusion speed is controlled to be 5-8 mm/s, the extrusion die size is controlled to be phi 10-20 mm, and a high-pressure medium is usually heat-resistant grease or glass-graphite mixture.
Step 5: carrying out multi-pass cold drawing on the NbTi/Cu composite rod, carrying out multiple ageing heat treatments on different specifications, carrying out cold drawing and multiple ageing to enable NbTi foil to separate out a large amount of alpha-Ti, refining the microscopic size of the Nb foil in the manual pinning center, generating more magnetic flux pinning centers, improving magnetic flux pinning force, and finally obtaining the NbTi/Cu composite wire with high critical current density.
The cold drawing pass processing rate of the NbTi/Cu composite rod is controlled to be 10% -30%, a small-angle die is selected, the temperature of ageing heat treatment is controlled to be 500 ℃ -800 ℃ generally, and the time of ageing heat treatment is controlled to be 50-100 h.
Example 1
The embodiment provides a preparation method of a high critical current density NbTi superconducting wire.
Firstly, performing multi-pass rolling on an NbTi sheet with the thickness of 4mm and an Nb sheet with the thickness of 4mm, wherein the rolling pass processing rate is controlled to be 5%, the accumulated deformation amount in the rolling process exceeds 60%, intermediate stress relief annealing is performed, the stress relief annealing temperature of the NbTi sheet is 700 ℃, the stress relief annealing temperature of the Nb sheet is 900 ℃, the final rolled product size of the NbTi sheet is 0.3mm thick, 200mm wide and 2000mm long, the final rolled product size of the Nb sheet is 0.06mm thick, 200mm wide and 2000mm long, final recrystallization annealing is performed after the final rolled product size of the NbTi foil and the Nb foil is cleaned, and the recrystallization annealing temperature of the NbTi foil is 900 ℃ and 1100 ℃.
Then the annealed and cleaned NbTi foils and Nb foils are alternately laid layer by layer in a clean room5 layers of Nb foil are respectively laid, whether the two ends are flush or not is carefully checked after the two layers are tiled, the Nb foil is wound on the surface of an Nb rod with the diameter of phi 8mm after confirmation, the flush end surfaces are ensured in the winding process, the NbTi foil and the Nb foil are forbidden from being wrinkled, the Nb foil is placed into a cleaned oxygen-free copper tube with a barrier layer of an Nb tube after the winding is completed, wherein the specification of the external diameter and the internal diameter of the oxygen-free copper tube is phi 68mm and phi 48mm, the wall thickness of the oxygen-free copper tube is 10mm, the Nb tube is made of an Nb plate with the thickness of 0.6mm, the lap joint length is 10mm, the assembly gap is controlled to be 0.5 mm-1.0 mm, then an upper cover and a lower cover are assembled for vacuum electron beam welding, performing hydrostatic extrusion on the NbTi/Cu composite ingot after welding, wherein the extrusion temperature is 900 ℃, the heat preservation time is 3h, the extrusion speed is 5mm/s, the extrusion ratio is 15, the extrusion die size is phi 17mm, performing water-cooling quenching on the composite ingot after extrusion die stripping, finally performing multi-pass peeling and cold drawing on the composite ingot, performing multiple ageing heat treatments on different specifications in the drawing process, wherein the total number of ageing heat treatments is 5, the heat treatment temperature is 550 ℃ each time, the heat treatment time is 55h each time, and finally obtaining the manual pinning APC NbTi/Cu composite wire with the wire diameter phi 0.5mm and the copper ratio of 1.0, wherein the critical current density is up to 650A/mm 2 (9T, 4.22K), the high field performance is improved by about 30% compared with the conventional 5-time aging heat treatment NbTi/Cu composite wire (purchased from Western superconducting materials technologies Co., ltd.).
Example 2
The embodiment provides a preparation method of a high critical current density NbTi superconducting wire.
Firstly, performing multi-pass rolling on an NbTi sheet with the thickness of 3mm and an Nb sheet with the thickness of 3mm, wherein the rolling pass processing rate is controlled to 7%, the accumulated deformation amount in the rolling process exceeds 60%, intermediate stress relief annealing is performed, the stress relief annealing temperature of the NbTi sheet is 750 ℃, the stress relief annealing temperature of the Nb sheet is 950 ℃, the final rolled product size of the NbTi sheet is 0.1mm thick, 200mm wide and 1500mm long, the final rolled product size of the Nb sheet is 0.04mm thick, 200mm wide and 1500mm long, the final recrystallization annealing is performed after the final rolled product size of the NbTi foil and the Nb foil is cleaned, and the recrystallization annealing temperature of the NbTi foil is 950 ℃ and the recrystallization annealing temperature of the Nb foil is 1150 ℃.
Then the annealed and cleaned NbTi foils and the Nb foils are alternately laid layer by layer in a clean room, and the NbTi foils are laid down layer by layerAnd 10 layers of Nb foil respectively, carefully checking whether the two ends are flush after tiling, winding the Nb foil on the surface of a Nb rod with the thickness of phi 5mm after confirming, ensuring the flush end surface in the winding process, prohibiting the NbTi foil and the Nb foil from wrinkling, putting the NbTi foil and the Nb foil into a cleaned oxygen-free copper tube with a Nb tube barrier layer after winding, wherein the specification of the external diameter and the internal diameter of the oxygen-free copper tube is phi 49mm, phi 37mm, the wall thickness is 6mm, the Nb tube is made of an Nb plate with the thickness of 0.5mm, the lap joint length is 10mm, the assembly gap is controlled to be 0.5 mm-1.0 mm, then fitting an upper cover and a lower cover for vacuum electron beam welding, performing hydrostatic extrusion on the NbTi/Cu composite ingot after welding, wherein the extrusion temperature is 800 ℃, the heat preservation time is 2h, the extrusion speed is 8mm/s, the extrusion ratio is 20, the extrusion die size is phi 11mm, performing water-cooling quenching on the composite ingot after extrusion die stripping, finally performing multi-pass peeling and cold drawing on the composite ingot, performing multiple ageing heat treatments on different specifications in the drawing process, wherein the total number of ageing heat treatments is 3, the heat treatment temperature is 650 ℃ each time, the heat treatment time is 90h each time, and finally obtaining the manual pinning APC NbTi/Cu composite wire with the wire diameter phi 0.4mm and the copper ratio of 0.8, wherein the critical current density is as high as 310A/mm 2 (9.8T, 4.22K) a 50% improvement in high field performance over conventional NbTi/Cu composite wire (available from Western superconducting materials technologies Co., ltd.).
Example 3
The embodiment provides a preparation method of a high critical current density NbTi superconducting wire.
Firstly, performing multi-pass rolling on an NbTi sheet with the thickness of 3mm and an Nb sheet with the thickness of 3mm, wherein the rolling pass working rate is controlled to be 10%, the accumulated deformation amount in the rolling process exceeds 60%, intermediate stress relief annealing is performed, the stress relief annealing temperature of the NbTi sheet is 800 ℃, the stress relief annealing temperature of the Nb sheet is 1000 ℃, the final rolled product size of the NbTi sheet is 0.2mm thick, 200mm wide and 1000mm long, the final rolled product size of the Nb sheet is 0.05mm thick, 200mm wide and 1000mm long, the final recrystallization annealing is performed after the final rolled product sizes of the NbTi foil and the Nb foil are cleaned, and the recrystallization annealing temperature of the NbTi foil is 1000 ℃ and 1200 ℃.
Then the annealed and cleaned NbTi foil and Nb foil are alternately laid layer by layer in a clean room, 8 layers of NbTi foil and Nb foil are respectively laidAfter the flat laying, carefully checking whether the two ends are flush or not, winding the Nb-shaped copper tube on the surface of an Nb rod with the diameter of 7mm after confirming, keeping the flush end surfaces during the winding process, prohibiting the NbTi foil and the Nb foil from wrinkling, putting the NbTi-shaped copper tube and the Nb-shaped copper tube into a cleaned oxygen-free copper tube with an Nb tube blocking layer after the winding is finished, wherein the external diameter and the internal diameter of the oxygen-free copper tube are respectively in the specifications of phi 44mm and phi 36mm, the wall thickness of 8mm, the Nb tube is formed by coiling an Nb plate with the thickness of 0.6mm, the lap joint length is 10mm, the assembly gap is controlled to be 0.5 mm-1.0 mm, then the upper cover and the lower cover are assembled for vacuum electron beam welding, the NbTi/Cu composite ingot is subjected to hydrostatic extrusion after the welding is finished, the extrusion temperature is 850 ℃, the heat preservation time is 3h, the extrusion speed is 6mm/s, the extrusion ratio is 19, the extrusion die size is phi 10mm, the composite rod is subjected to water cooling quenching after the extrusion die, finally the composite rod is subjected to multi-pass skinning and cold drawing, the thermal ageing treatment is performed for multiple times in different drawing processes, the total times of ageing treatment is 4 times, the total heat treatment time is 60 ℃, the temperature is 60 ℃ and the critical current density of Cu is 200mm, and the current is 200mm per critical density of Cu is 200.0 mm, and the current is obtained 2 (10T, 4.22K), the high field performance is improved by 40% compared with the conventional NbTi/Cu composite wire (purchased from Western superconducting materials technologies Co., ltd.).
As described above, the basic principles, main features and advantages of the present invention are better described. The above examples and description are merely illustrative of preferred embodiments of the present invention, and the present invention is not limited to the above examples, and various changes and modifications to the technical solution of the present invention by those skilled in the art should fall within the scope of protection defined by the present invention without departing from the spirit and scope of the present invention.
Claims (6)
1. A method for preparing a high critical current density NbTi superconducting wire, comprising: alternately winding NbTi foil and Nb foil on the surface of the Nb rod to prepare the Nb rod with a plurality of layers of NbTi foil and Nb foil coated on the surface;
placing the Nb rod with the surface coated with a plurality of layers of NbTi foils and Nb foils in an oxygen-free copper sheath with an Nb cylinder barrier layer, and welding after capping to obtain an NbTi/Cu composite ingot;
performing hydrostatic extrusion on the NbTi/Cu composite ingot to obtain an NbTi/Cu composite rod;
carrying out multi-pass cold drawing on the NbTi/Cu composite rod, and carrying out multiple ageing heat treatment in the multi-pass cold drawing process to obtain an NbTi superconducting wire;
in the Nb rod with the surface coated with multiple layers of NbTi foils and Nb foils, the total number of layers of the NbTi foils and the Nb foils is not higher than 10;
the thickness of the NbTi foil is 0.1 mm-0.3 mm;
the thickness of the Nb foil is 0.04 mm-0.06 mm;
the size of the Nb rod is phi 5 mm-phi 8mm;
the Nb cylinder barrier layer is prepared by rolling a niobium plate with the thickness of 0.5 mm-0.6 mm, and the length of a lap joint part in the rolling is 5 mm-10 mm;
and the assembly gap between the Nb rod coated with the multi-layer NbTi foil and the Nb foil and the oxygen-free copper sheathing with the Nb barrel barrier layer is 0.5 mm-1.0 mm.
2. The method for preparing the NbTi superconducting wire rod with the high critical current density according to claim 1, wherein NbTi thin plates with the thickness of 3-4 mm are rolled for multiple times, the rolling pass processing rate is controlled to be 5-10%, the cumulative deformation in the rolling process exceeds 60%, stress relief annealing is carried out at 700-800 ℃, and finally the NbTi foil is prepared by recrystallization annealing at 900-1000 ℃;
and (3) carrying out multi-pass rolling on the Nb sheet with the thickness of 3-4 mm, controlling the rolling pass working rate to be 5-10%, carrying out stress relief annealing at 900-1000 ℃ when the accumulated deformation in the rolling process exceeds 60%, and finally carrying out recrystallization annealing at 1100-1200 ℃ to obtain the Nb foil.
3. The method of producing a high critical current density NbTi superconducting wire according to claim 1, wherein the parameters of the hydrostatic extrusion are set as: the extrusion ratio is controlled to be 15-20, the extrusion temperature is controlled to be 800-900 ℃, the extrusion speed is controlled to be 5-8 mm/s, and the extrusion die size is controlled to be phi 10-20 mm.
4. The method for producing a high critical current density NbTi superconducting wire according to claim 1, wherein the processing rate per pass in the multi-pass cold drawing is 10% -30%;
in the multiple ageing heat treatment, the temperature of each ageing heat treatment is 500-800 ℃ and the time is 50-100 h.
5. An NbTi superconducting wire, characterized in that it is produced by the method for producing an NbTi superconducting wire having a high critical current density according to any one of claims 1 to 4.
6. The use of the method for preparing a high critical current density NbTi superconducting wire as claimed in any one of claims 1 to 4 for increasing the critical current density of NbTi superconducting wire.
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