CN117711692A - High current-carrying Nb 3 Preparation method of Sn superconducting wire - Google Patents
High current-carrying Nb 3 Preparation method of Sn superconducting wire Download PDFInfo
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- CN117711692A CN117711692A CN202311615116.1A CN202311615116A CN117711692A CN 117711692 A CN117711692 A CN 117711692A CN 202311615116 A CN202311615116 A CN 202311615116A CN 117711692 A CN117711692 A CN 117711692A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 67
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 239000002243 precursor Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000011068 loading method Methods 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 9
- 230000007704 transition Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 229910017755 Cu-Sn Inorganic materials 0.000 description 2
- 229910017927 Cu—Sn Inorganic materials 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910000555 a15 phase Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000314 poly p-methyl styrene Polymers 0.000 description 2
- 206010063401 primary progressive multiple sclerosis Diseases 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910020888 Sn-Cu Inorganic materials 0.000 description 1
- 229910019204 Sn—Cu Inorganic materials 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- -1 sleeve Chemical compound 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
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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
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention provides a high current-carrying Nb 3 A preparation method of Sn superconducting wire belongs to the technical field of superconducting material preparation, and comprises the following steps: mixing Nb powder, sn powder and Cu powder, loading into Nb tube, and reducing to obtain Nb 3 A Sn precursor wire; the Nb is added within 2 to 30 seconds 3 Heating Sn precursor wire to 1900 ℃ or above, and cooling very rapidly or slowly to obtain Nb 3 An Sn initial superconducting wire; for the Nb 3 Annealing heat treatment is carried out on the Sn initial superconducting wire rod to obtain Nb 3 Sn eventually superconducting wire. The method prepares Nb by a short-time high-temperature mode 3 The Sn superconducting wire has short production period, low energy consumption, obviously improved superconducting transition temperature and high current carrying capacity.
Description
Technical Field
The invention belongs to the technical field of superconducting material preparation, and relates to a high current-carrying Nb 3 A method for preparing Sn superconducting wire.
Background
Of the industrially producible superconducting materials that have been put into practical use, nbTi and Nb 3 Sn is the most commonly used material for winding large superconducting magnets, and is generally NbTi for magnets below 10T and Nb for magnets above 10T 3 Sn。Nb 3 Sn as a practical low-temperature superconducting material has a high superconducting transition temperature T C High upper critical magnetic field H C2 And high critical current density J C The magnetic flux is widely used for large-scale superconducting magnets, such as high-field magnets for preparing large-scale scientific devices such as international thermonuclear fusion experimental reactor (ITER) projects, ultra-high-brightness hadron collimators (VLHC), high-energy particle accelerators and the like.
Nb 3 Sn has been widely used for the preparation of high-field superconducting magnets above 10T, whether small spiral tube magnets used in laboratories or Rutherford cables used in large particle accelerator science devices, and armored cable conductors used in magnetic confinement nuclear fusion devices, thus further research and development of Nb 3 The novel preparation method and the reduction of the production cost of the Sn superconducting wire are widely paid attention to. Nb (Nb) 3 Sn is a brittle compound, the superconducting phase formation of which is realized by high-temperature Nb and Sn diffusion reaction, nb 3 The Sn superconducting magnet can only be prepared by adopting a mode of winding firstly and then reacting. One explores a plurality of Nb 3 Sn superconducting wire preparation technology, including vapor deposition, solid-liquid diffusion, bronze, internal tin, sleeve, PIT, etc., is currently used for large-scale industrial production of Nb 3 The main method of the Sn superconducting wire comprises the following steps: bronze, internal tin, PIT, etc., the main difference between these three methods is the different ways in which the Sn source is provided. After reaction to phase, nb 3 The superconducting characteristics of Sn are determined by the Sn content, and the Sn content in the superconducting layer is increased to T C And H C2 And the superconducting properties are enhanced. From the binary phase diagram of Nb-Sn, nb is obtained 3 The Sn single phase has a phase formation temperature higher than 930 ℃ and is sintered for a long time. From the practical point of view, the temperature is quite high, and Nb is added 3 Difficulty and cost of Sn preparationAnd such long sintering at 900 ℃ or higher causes Nb to be 3 Sn grains grow up, resulting in J C The performance is poor. However, cu has been found to be effective in reducing Nb 3 Sn has a phase formation temperature such that it forms rapidly at 600-700 ℃, and is thus now commercially available Nb 3 The Sn wire adopts a Nb-Sn-Cu ternary system so as to reduce the manufacturing cost.
The performance of high field magnets is largely determined by Nb 3 Critical current density (J) of Sn wire C ) I.e. maximum superconducting current which can be transported unimpeded per unit area of wire, J of wire C The higher the wound magnet is, the stronger the magnetic field can be generated. Nb (Nb) 3 J of Sn C The performance is mainly that firstly Nb 3 Sn meets the metering ratio and secondly the flux pinning capability. Nb (Nb) 3 The pinning center of Sn is a grain boundary, the smaller the grain size is, the better the pinning effect is, J C The higher.
At present, most research teams produce Nb 3 The Sn superconducting wire is subjected to high-temperature diffusion reaction to form a phase, the wire is subjected to heat treatment in a plurality of different temperature stages, the heating time reaching hundreds of hours is long, the energy is consumed, and the quality control difficulty of the finished wire is increased. It is therefore highly desirable to explore a method of short-time phase formation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high current-carrying Nb 3 Method for preparing Sn superconducting wire rod by rapid thermal quenching 3 Sn superconducting wire, short production period and low energy consumption, and the prepared Nb 3 The superconducting transition temperature of the Sn superconducting wire is obviously improved, and the Sn superconducting wire has high current carrying capacity.
The invention is realized by the following technical scheme:
the invention provides a high current-carrying Nb 3 A method of producing a Sn superconducting wire, the method comprising:
uniformly mixing Nb powder, sn powder and Cu powder, and then filling the mixture into an Nb tube to obtain a precursor wire;
reducing the precursor wire rod to obtain Cu-doped Nb 3 A Sn wire;
the Nb is added within 2 to 30 seconds 3 Heating Sn precursor wire to 1900 ℃ or above, and cooling very rapidly or slowly to obtain Nb 3 An Sn initial superconducting wire;
for the Nb 3 Annealing heat treatment is carried out on the Sn initial superconducting wire rod to obtain Nb 3 Sn eventually superconducting wire.
Further, the Nb is added within 2 to 30 seconds 3 Heating Sn precursor wire to 1900 ℃ or above, and cooling very rapidly or slowly to obtain Nb 3 The Sn initial superconducting wire specifically comprises:
heating the Nb with a rapid thermal quench apparatus (RHQ) 3 Sn precursor wire rod, joule heating time of 2-30 s, nb 3 Heating the Sn precursor wire to be above 1900 ℃, then controlling the closing and opening of an electromagnetic ejection assembly of a Joule heating power supply, and heating the Nb 3 The Sn precursor wire is cooled very fast or slowly to obtain Nb 3 Sn-initial superconducting wire.
Further, the pair of Nb 3 Annealing heat treatment is carried out on the Sn initial superconducting wire rod to obtain Nb 3 The Sn final superconducting wire specifically comprises:
the Nb is 3 Heating the Sn initial superconducting wire to 700-800 ℃ at room temperature at a heating rate of 5-10 ℃/min, and preserving heat for 5-10 hours to obtain Nb 3 Sn eventually superconducting wire.
Further, mixing Nb powder, sn powder and Cu powder uniformly, filling into an Nb tube, and reducing to obtain Nb 3 The Sn precursor wire specifically comprises:
mixing Nb powder, sn powder and Cu powder, loading into Nb tube, and rotary forging to obtain Nb 3 And a Sn precursor wire.
Further, the atomic ratio of the Nb powder to the Sn powder is 3:1, the weight of the Cu powder is 10% of the total weight of three powders of Nb powder, sn powder and Cu powder.
Further, the grain size of the Nb powder is 1-5 mu m, the grain size of the Sn powder is 25-45 mu m, and the grain size of the Cu powder is 5-20 mu m;
the purities of the Nb powder, the Sn powder and the Cu powder are all more than 99.9 percent.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
1. the invention relates to a high current-carrying Nb 3 Preparation method of Sn superconducting wire, compared with traditional Nb 3 The Sn superconducting wire material phase-forming process needs to be subjected to different stages of heat treatment to generate a uniform Cu-Sn or Nb-Sn phase, the heating time is hundreds of hours, the production period is long, the energy is consumed, and the quality control difficulty of the finished wire material is increased, so that the Cu-doped Nb preparation method is used for preparing the Cu-doped Nb in 2 seconds 3 The Sn wire is heated to over 1900 ℃, so that the heating speed is higher, the production period is short, and the energy consumption is lower.
2. The invention relates to a high current-carrying Nb 3 The method for preparing Sn superconducting wire can generate ternary Nb-Cu-Sn compound which can reach a molten state when the RHQ sintering temperature reaches over 1900 ℃, is more favorable for Cu dispersion and further inhibits non-superconducting phase Nb 6 Sn 5 Increasing the thickness of the a15 layer and thereby increasing Nb 3 Superconducting properties of Sn superconducting wire; in addition, when the RHQ temperature reaches 1900 ℃ and above, the atomic diffusion capability is greatly improved, the diffusion reaction speed is fast enough, a thicker A15 layer can be generated, and holes in a small range are reduced.
3. The invention relates to a high current-carrying Nb 3 Method for preparing Sn superconducting wire, nb prepared by the method 3 In the microstructure of Sn superconducting wire, nb of A15 structure 3 The Sn superconducting layer occupies a large part, the generated superconducting phase is thicker and more, and has higher superconducting transition temperature, because the instantaneous high-temperature treatment can directly prepare the high-temperature phase A15Nb 3 Sn material, avoiding generation of low-temperature phase Nb 6 Sn 5 、NbSn 2 The material performance is reduced, the processing stress is removed while the structure of the wire rod structure is maintained, and the processing performance of the wire rod is recovered 3 Sn superconducting wire T C 17.8K is reached and the transition width is only 0.2K.
4. The invention relates to a high current-carrying Nb 3 Method for producing Sn superconducting wire, wherein the precursor wire is reduced in diameter before RHQ heatingIn this way, nb with a smaller wire diameter can be obtained by the reducing treatment 3 The Sn wire can prevent the flux jump of the obtained superconducting wire, so that the superconducting core wire is more compact.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of Nb doped with 10% wtCu of example 1 3 Scanning electron microscope pictures of Sn superconducting wires;
FIG. 2 is a schematic diagram of Nb doped with 10% wtCu of example 1 3 A plot of the magnetization M (emu/g) of Sn superconducting wire as a function of temperature T (K);
FIG. 3 is a schematic diagram of Nb doped with 10% wtCu of example 2 3 Scanning electron microscope pictures of Sn superconducting wires;
FIG. 4 is a schematic diagram of example 2 Nb doped with 10% wtCu 3 Magnetization M (emu/g) of Sn superconducting wire changes with temperature T (K).
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The following will be a high current carrying Nb for this application in combination with examples and experimental data 3 The method for producing the Sn superconducting wire is described in detail.
Example 1
The embodiment is a high current-carrying Nb 3 The preparation method of the Sn superconducting wire comprises the following steps:
(1) Cu-doped Nb/Sn precursor wire preparation:
in a glove box under the protection of argon, micrometer-scale Nb powder and Sn powder are mixed according to an atomic ratio of 3:1, weighing Cu powder accounting for 10% of the total mass, uniformly mixing through planetary ball milling, and then filling into a Nb tube, and compacting to obtain the Nb tube filled with precursor wire powder.
Wherein the grain sizes of the Nb powder, the Sn powder and the Cu powder are 5 mu m, 45 mu m and 20 mu m respectively; the purity of Nb powder, sn powder and Cu powder is more than 99.9 percent.
(2) Reducing:
placing an Nb pipe with the outer diameter of 10mm and the inner diameter of 7mm into a rotary forging machine, carrying out rotary forging to the inner diameter of 1.7mm by using different grinding tools, and shearing to the length of 14cm to obtain a short sample Cu doped Nb 3 And Sn wires.
(3) And (3) quick-heating quenching heat treatment:
heating the short-sample Cu doped Nb with RHQ equipment 3 Sn wire, RHQ equipment sets the Joule heating time to 2S, and the Cu doped Nb is heated in 2s 3 Heating Sn wire to above 2000 ℃, and under the double control of a Joule heating power supply and an electromagnetic ejection assembly, heating the Cu-doped Nb 3 The Sn wire rod is quickly sprung into Ga solution to be quenched, and Nb is generated 3 Sn superconducting wire.
(4)Nb 3 The Sn superconducting wire is processed at low temperature to obtain thicker A15 layer Nb 3 Sn superconducting wire:
intercepting Nb obtained after 5cm rapid heating quenching heat treatment 3 Placing the Sn superconducting wire into a crucible, performing subsequent annealing process in a vacuum tube furnace, heating to 800 ℃ at room temperature at a heating rate of 5 ℃/min, and preserving heat for 10 hours to obtain a thicker 15-layer Nb 3 Sn superconducting wire.
Nb prepared in this example 3 Micro-scale of Sn superconducting wireThe structure is shown in figure 1, in which the light white is A15 phase Nb 3 Sn, it can be seen that A15 layer Nb is obtained 3 Sn is the majority, and the resulting superconducting phase is thicker and more.
For Nb prepared in this example 3 Sn superconducting wire was tested for superconducting performance using Vibrating Sample Magnetometer (VSM) functions of quantium Design complex test system (PPMS), and a wire segment about 3mm long was selected from a typical annealed sample for magnetic testing. The results are shown in FIG. 2.
FIG. 2 shows PIT Nb doped with 10% wtCu 3 Trend of Sn wire magnetization M (emu/g) as a function of temperature T (K). It can be seen that Nb 3 The Sn superconducting wire has a high superconducting transition temperature, tc reaches 17.5K, and the transition width is only 0.7K, nb in FIG. 2 3 The Sn wire had a maximum firing temperature of 2074 ℃ during RHQ.
Example 2
The embodiment is a high current-carrying Nb 3 The preparation method of the Sn superconducting wire comprises the following steps:
in a glove box under the protection of argon, micrometer-scale Nb powder and Sn powder are mixed according to an atomic ratio of 3:1, weighing Cu powder accounting for 10% of the total mass, uniformly mixing through planetary ball milling, and filling the powder into a Nb tube and compacting.
Wherein the grain sizes of the Nb powder, the Sn powder and the Cu powder are 5 mu m, 45 mu m and 20 mu m respectively; the purity of Nb powder, sn powder and Cu powder is more than 99.9 percent.
(2) Reducing:
placing an Nb pipe with the outer diameter of 10mm and the inner diameter of 7mm into a rotary forging machine, carrying out rotary forging to the inner diameter of 1.7mm by using different grinding tools, and shearing to the length of 14cm to obtain a short sample Cu doped Nb 3 And Sn wires.
(3) And (3) quick-heating quenching heat treatment:
heating the short-sample Cu doped Nb with RHQ equipment 3 Sn wire, RHQ equipment sets the Joule heating time to be 2s, and the Cu doped Nb is heated within 2s 3 Heating Sn wire to 1900 ℃ or higher, and under the dual control of a Joule heating power supply and an electromagnetic ejection assembly, heating the Cu-doped Nb 3 The Sn wire rod is quickly sprung into Ga solution for quenching, and then the Sn wire rod is producedNb 3 Sn superconducting wire.
(4)Nb 3 The Sn superconducting wire is processed at low temperature to obtain thicker A15 layer Nb 3 Sn superconducting wire:
intercepting Nb obtained after 5cm rapid heating quenching heat treatment 3 Placing the Sn superconducting wire into a crucible, performing subsequent annealing process in a vacuum tube furnace, heating to 800 ℃ at room temperature at a heating rate of 5 ℃/min, and preserving heat for 10 hours to obtain a thicker 15-layer Nb 3 Sn superconducting wire.
Nb prepared in this example 3 The microstructure of the Sn superconducting wire is shown in FIG. 3, which shows light white A15 phase Nb 3 Sn, it can be seen that A15Nb is obtained 3 Sn is the majority, and the resulting superconducting phase is thicker and more.
For Nb prepared in this example 3 Sn superconducting wire was tested for superconducting performance using Vibrating Sample Magnetometer (VSM) functions of quantium Design complex test system (PPMS), and a wire segment about 3mm long was selected from a typical annealed sample for magnetic testing. The results are shown in FIG. 4.
FIG. 4 shows PITNb doped with 10% wtCu 3 Trend of Sn wire magnetization M (emu/g) as a function of temperature T (K). It can be seen that Nb 3 The Sn superconducting wire has a very high superconducting transition temperature, tc reaches 17.8K, and the transition width is only 0.2K.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. High current-carrying Nb 3 A method for producing a Sn superconducting wire, comprising:
mixing Nb powder, sn powder and Cu powder, loading into Nb tube, and reducing to obtain Nb 3 A Sn precursor wire;
the Nb is added within 2 to 30 seconds 3 Heating Sn precursor wire to 1900 ℃ or above, and cooling very rapidly or slowly to obtain Nb 3 An Sn initial superconducting wire;
for the Nb 3 Annealing heat treatment is carried out on the Sn initial superconducting wire rod to obtain Nb 3 Sn eventually superconducting wire.
2. A high current carrying Nb as in claim 1 3 A process for producing a Sn superconducting wire, characterized in that the Nb is added within 2 to 30 seconds 3 Heating Sn precursor wire to 1900 ℃ or above, and cooling very rapidly or slowly to obtain Nb 3 The Sn initial superconducting wire specifically comprises:
heating the Nb with a rapid thermal quench apparatus 3 Sn precursor wire rod, joule heating time of 2-30 s, nb 3 Heating the Sn precursor wire to be above 1900 ℃, then controlling the closing and opening of an electromagnetic ejection assembly of a Joule heating power supply, and heating the Nb 3 The Sn precursor wire is cooled very fast or slowly to obtain Nb 3 Sn-initial superconducting wire.
3. A high current carrying Nb as in claim 1 3 A method for producing a Sn superconducting wire, characterized in that the pair of Nb 3 Annealing heat treatment is carried out on the Sn initial superconducting wire rod to obtain Nb 3 The Sn final superconducting wire specifically comprises:
the Nb is 3 Heating the Sn initial superconducting wire to 700-800 ℃ at room temperature at a heating rate of 5-10 ℃/min, and preserving heat for 5-10 hours to obtain Nb 3 Sn eventually superconducting wire.
4. A high current carrying Nb as in claim 1 3 A process for producing a Sn superconducting wire, characterized by comprising mixing Nb powder, sn powder and Cu powder uniformly, charging into a Nb tube, and reducing the diameter to obtain Nb 3 The Sn precursor wire specifically comprises:
mixing Nb powder, sn powder and Cu powder, loading into Nb tube, and rotary forging to obtain Nb 3 And a Sn precursor wire.
5. A high current carrying Nb as in claim 1 3 The preparation method of the Sn superconducting wire is characterized in that the atomic ratio of the Nb powder to the Sn powder is 3:1, the weight of the Cu powder is 10% of the total weight of three powders of Nb powder, sn powder and Cu powder.
6. A high current carrying Nb as in claim 1 or 5 3 The preparation method of the Sn superconducting wire is characterized in that the grain size of the Nb powder is 1-5 mu m, the grain size of the Sn powder is 25-45 mu m, and the grain size of the Cu powder is 5-20 mu m;
the purities of the Nb powder, the Sn powder and the Cu powder are all more than 99.9 percent.
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