Method for quickly realizing bronze processing of Nb3Sn superconducting wire based on electric pulse treatment

Abstract

The application discloses a method for rapidly realizing bronze processing of Nb3Sn superconducting wire based on electric pulse treatment, and specifically comprises the following steps: step 1, preparing an Nb3Sn precursor wire through an internal tin method; step 2, performing electric pulse treatment on the Nb3Sn precursor wire prepared in step 1 to obtain a wire sample after electric pulse treatment; and step 3, performing heat treatment on the sample after electric pulse treatment obtained in step 2 by using a vacuum atmosphere heat treatment furnace to obtain an Nb3Sn wire after bronze heat treatment. The application solves the problem of long phase formation heat treatment time of the existing Nb3Sn wire prepared through the internal tin method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of superconducting phase preparation process optimization, and relates to a method for rapidly realizing bronze processing of Nb3Sn superconducting wire based on electric pulse processing. BACKGROUND

[0002] Nb3Sn superconducting wire prepared by the internal tin method has an extremely high critical current density, which can be as high as 3000 A / mm 2 Therefore, the internal tin method is the preferred approach for commercial production of Nb3Sn wire. The internal tin method process can be divided into two stages. The first stage is the Nb3Sn wire precursor preparation stage: Cu tube, Nb rod and Sn rod are assembled and drawn to obtain a Cu / Sn / Nb assembly. The second stage is the long-range phase formation heat treatment stage of the Nb3Sn wire precursor: the Nb3Sn precursor is first subjected to Cu-Sn compound reaction at a medium-low temperature (185℃-445℃) for more than 100 hours to generate Cu-Sn compound Cu6Sn5 required for Nb3Sn phase formation, and the bronze processing heat treatment stage is completed; finally, the Cu6Sn5 generated in the medium-low temperature stage is reacted with the Nb rod at a higher reaction temperature (600℃-750℃) for more than 50 hours to generate Nb3Sn with superconducting properties, and the Nb3Sn phase formation heat treatment is completed. Therefore, bronze processing heat treatment of the Nb3Sn wire precursor, generation of Cu6Sn5 and improvement of its content are the key to realizing Nb3Sn phase formation and improving the superconducting properties of Nb3Sn. However, the bronze processing heat treatment time of the Nb3Sn wire precursor can be more than 100 hours in total, which makes the phase formation of the Nb3Sn wire precursor have the limitations of long time and low efficiency. In addition, the long-range bronze processing heat treatment also makes the Cu-Sn compound reaction process difficult to control, which causes the Cu-Sn phase formation process to have uncontrollable phase composition, easy generation of harmful phases, large grain size and other defects, reduces the Cu6Sn5 content, affects the subsequent Nb3Sn phase formation ability, and weakens the superconducting properties of the finished wire.

[0003] Electric pulse processing has the characteristics of rapid temperature rise and fall. Through this processing, a large amount of Joule heat and electron wind force effect generated by the pulse current can be applied on the metal to realize the regulation of ordered phase types, morphology and size. In the bronze processing heat treatment process of the Nb3Sn wire precursor, the introduction of a pulse electric field can accelerate the element diffusion in the Cu-Sn system, the pulse energy can regulate the Cu6Sn5 phase content through element distribution, promote the nucleation of Cu6Sn5, and improve the diffusion layer thickness of Cu6Sn5 to provide sufficient reaction source for the subsequent Nb3Sn phase formation. Therefore, accelerating the bronze processing heat treatment time through electric pulse plays an important role in improving the preparation efficiency of Nb3Sn wire, regulating the morphology of the bronze processing stage, and preparing high-current Nb3Sn wire superconducting. SUMMARY

[0004] The application aims to provide a method for quickly realizing bronze processing of Nb3Sn superconducting wire based on electric pulse treatment, and solve the problem of long phase formation heat treatment time existing in the preparation of Nb3Sn wire by the existing internal tin method.

[0005] The technical scheme adopted by the application is that the method for quickly realizing bronze processing of Nb3Sn superconducting wire based on electric pulse treatment specifically comprises the following steps:

[0006] Step 1, preparing Nb3Sn precursor wire by the internal tin method;

[0007] Step 2, performing electric pulse treatment on the Nb3Sn precursor wire prepared in step 1 to obtain wire sample after electric pulse treatment;

[0008] Step 3, performing heat treatment on the sample after electric pulse treatment obtained in step 2 by using a vacuum atmosphere heat treatment furnace to obtain Nb3Sn wire after bronze processing heat treatment.

[0009] The application also has the following characteristics:

[0010] The specific process of step 1 is as follows:

[0011] Step 1.1, a circular hole A and four circular holes B are respectively formed along the axial direction of the copper rod, the circular hole A is located at the center of the copper rod, and the four circular holes B are uniformly distributed around the circular hole A;

[0012] Step 1.2, the copper rod is pickled, and then the niobium rod, the tin rod and the pickled copper rod are ultrasonically cleaned and dried together;

[0013] Step 1.3, the dried tin rod is loaded into the circular hole A, and the four dried niobium rods are respectively loaded into the four circular holes B to obtain a Cu / Sn / Nb assembly;

[0014] Step 1.4, a multi-pass drawing process is performed by using a cold drawing machine, so that the overall deformation of the Cu / Sn / Nb assembly reaches 80%-85%, that is, the Nb3Sn precursor wire is obtained.

[0015] In step 1.2, the outer diameter of the copper rod is 30-50mm; the diameter of the tin rod is 12-20mm; and the diameter of the niobium rod is 5-10mm.

[0016] In step 1.2, the ultrasonic cleaning time is 10-15min.

[0017] In step 1.4, the diameter deformation of each pass is 0.5-1mm.

[0018] The specific process of step 2 is as follows: a sample with a length of 80mm is cut from the middle of the Nb3Sn precursor wire prepared in step 1, and is clamped on the electric pulse equipment for electric pulse.

[0019] In step 2, the electric pulse treatment parameters are: pulse voltage 50-60v, pulse frequency 350-400Hz, pulse time 50-60s.

[0020] The specific process of step 3 is: the heating rate of the vacuum atmosphere heat treatment furnace in the heating stage is 5-10℃ / min, so that the heat treatment temperature is raised from room temperature to 190℃-215℃, and the temperature is kept for 50h; then the temperature is raised to 405℃-420℃, and the temperature is kept for 25h, and the furnace is cooled.

[0021] The present application has the beneficial effects that the present application provides a new process for phase formation heat treatment of Nb3Sn wire prepared by internal tin method, i.e. electric pulse-short bronze heat treatment process. On the one hand, electric pulse has the characteristics of rapid temperature rise and fall, which can perform bronze heat treatment on the Nb3Sn wire precursor in a short time, save heat treatment time, and improve the preparation efficiency of Nb3Sn superconducting wire. On the other hand, the pulse current can generate extremely high Joule heat and electric power wind effect in a very short time, accelerate the element diffusion in the Cu-Sn system, promote the nucleation of Cu6Sn5, and improve the thickness of the Cu6Sn5 diffusion layer, providing sufficient reaction source for the subsequent Nb3Sn phase formation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a Cu / Sn / Nb assembly schematic diagram of the present application based on the method of rapidly realizing bronze of Nb3Sn superconducting wire by electric pulse treatment;

[0023] Figure 2 is a sample preparation process comparison diagram of example 1 and comparative example 1, comparative example 2 of the method of rapidly realizing bronze of Nb3Sn superconducting wire by electric pulse treatment based on the present application;

[0024] Figure 3 is a Cu6Sn5 diffusion state schematic diagram after electric pulse and shortening the bronze stage heat treatment time in example 1 of the method of rapidly realizing bronze of Nb3Sn superconducting wire by electric pulse treatment;

[0025] Figure 4 is a Cu6Sn5 diffusion state schematic diagram after conventional bronze stage heat treatment in comparative example 1 of the method of rapidly realizing bronze of Nb3Sn superconducting wire by electric pulse treatment based on the present application;

[0026] Figure 5 is a Cu6Sn5 diffusion state schematic diagram after not electric pulse and shortening the bronze stage heat treatment time in comparative example 2 of the method of rapidly realizing bronze of Nb3Sn superconducting wire by electric pulse treatment. DETAILED DESCRIPTION

[0027] The specific embodiments will be described in detail below.

[0028] The application is based on a method for quickly realizing bronze processing of Nb3Sn superconducting wires by electric pulse treatment, and is specifically performed according to the following steps:

[0029] Step 1, pretreat the raw materials: acid washing, ultrasonic cleaning. Dry the pretreated sample, assemble, and perform multi-pass drawing on the assembly to obtain an inner-tin Nb3Sn wire with appropriate size and uniform structure;

[0030] In step 1, the copper rod has an outer diameter of 30-50 mm and a height of 150-200 mm; the niobium rod has a diameter of 5-10 mm and a height of 150-200 mm; and the tin rod has a diameter of 12-20 mm and a height of 150-200 mm. The copper rod is acid washed, and the copper rod, niobium rod, and tin rod are ultrasonically cleaned for 10-15 min, and then dried and drawn using a cold drawing machine at a drawing speed of 0.5 mm / s, with a diameter deformation of 0.5-1 mm per pass. The multi-pass drawing is performed until the deformation reaches 80%-85%, and the final outer diameter of the copper rod is reduced to 6-7 mm.

[0031] Step 2, cut the wire obtained in step 1 in the middle and perform electric pulse treatment to obtain a wire sample after electric pulse treatment;

[0032] In step 2, the electric pulse process is as follows: a sample with a length of 80 mm is cut from the middle of the drawn wire and clamped in an electric pulse device for electric pulse treatment. The electric pulse process parameters are as follows: pulse voltage 50-60 V, pulse frequency 350-400 Hz, and pulse time 50-60 s.

[0033] Step 3, perform Cu-Sn bronze reaction stage heat treatment on the electric pulse treated sample obtained in step 2 using a vacuum atmosphere heat treatment furnace. Compared with the conventional process, the bronze heat treatment time is shortened to 75 hours, and a Nb3Sn wire with shortened bronze heat treatment time is obtained.

[0034] In step 3, the bronze heat treatment process is as follows: the electric pulse treated sample is placed in a vacuum atmosphere heat treatment furnace, and the vacuum degree is controlled to 10 -2 and the following is heat treated. The heat treatment parameters are as follows: the vacuum atmosphere heat treatment furnace is kept at a heating rate of 5-10 ℃ / min in the heating stage, so that the heat treatment temperature is raised from room temperature to 190-215 ℃, and the temperature is kept at this temperature for 50 h; then the temperature is raised to 405-420 ℃, and the temperature is kept at this temperature for 25 h, and the furnace is cooled.

[0035] The application guarantees the grain size, provides deformation storage energy, and lays a foundation for improving the performance of subsequent Nb3Sn superconducting wires. Through this fine process control, the application not only shortens the bronze heat treatment time of the Nb3Sn superconducting wire, but also improves the diffusion layer thickness of Cu6Sn5, provides a reaction source for the subsequent generation of high-current Nb3Sn superconducting wires, and lays a foundation for improving the superconducting performance of the Nb3Sn superconducting wire.

[0036] The method for rapidly realizing bronze of Nb3Sn superconducting wire based on electric pulse treatment according to the application will be further explained in detail through specific examples below.

[0037] Example 1

[0038] A bronze heat treatment sample of 210℃ for 50h / 410℃ for 25h after electric pulse preparation is prepared as follows: the oxygen-free copper sheath is pickled with 10% nitric acid, the pickled oxygen-free copper sheath, tin rod and niobium rod are ultrasonically cleaned with anhydrous ethanol for 10min and then ultrasonically cleaned with deionized water for 10min, and then assembled into Figure 1 structure for standby.

[0039] The assembled body after drying is subjected to multi-pass drawing using a chain automatic cold drawing machine, and the die deformation of each pass is 0.5-1mm (the die deformation of each pass is different), and the original outer diameter of the assembled body is 30mm and is drawn to an outer diameter of less than 7mm. In order to reduce the friction between the die and the assembled body, the die should be oiled before each drawing pass. Finally, a wire with an outer diameter of 6.3mm and a length of 1500mm is obtained.

[0040] A sample with a length of 80mm is cut from the middle of the wire using a wire cutting device for electric pulse. The two ends of the sample are connected to the clamps of the electric pulse device and fixed, the pulse voltage is set to 60V, the pulse frequency is 400Hz, and the pulse time is 50s, and the electric pulse is performed.

[0041] The sample obtained by electric pulse is placed in a vacuum atmosphere heat treatment furnace, and vacuumized to 10 -2 Then, the temperature is raised at a speed of 5℃ / min, and the room temperature is raised to 210℃, and the 210℃ is kept for 3000min; the temperature is raised at a speed of 5℃ / min, and the 210℃ is raised to 410℃, and the 410℃ is kept for 1500min, and the sample is taken out when the furnace is cooled to below 100℃. As shown in Figure 2 , the electric pulse and heat treatment process of this example case. As shown in Figure 3 , the average thickness of the Cu6Sn5 diffusion layer of the sample can reach 182µm.

[0042] Comparative Example 1

[0043] The bronze stage heat treatment sample of 210°C, 50h / 410°C, 50h was prepared, specifically: the oxygen-free copper sleeve was pickled with 10% nitric acid, the oxygen-free copper sleeve, tin rod, and niobium rod after pickling were ultrasonically cleaned with anhydrous ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 10 minutes, and assembled into Figure 1 as shown in the structure for standby.

[0044] The assembled body after drying was subjected to multi-pass drawing using a chain type cold automatic drawing machine, with a die deformation of 0.5-1mm per pass, and the original outer diameter of the assembled body was 30mm and drawn to an outer diameter of less than 7mm. In order to reduce the friction between the die and the assembled body, the die should be oiled before each drawing pass. The final wire diameter was 6.3mm, and the length was 1500mm.

[0045] A length of 80mm of the wire was cut in the middle using a wire cutting device for heat treatment. It was placed in a vacuum atmosphere heat treatment furnace, vacuumed to 10 -2 The temperature was raised at a rate of 5°C / min, the room temperature was raised to 210°C, 210°C was kept for 3000min, the temperature was raised at a rate of 5°C / min, 210°C was raised to 410°C, 410°C was kept for 3000min, and the furnace was cooled to below 100 degrees to take samples. As shown in Figure 2 The heat treatment process of the present comparative example is shown in the table. Figure 4 As shown in the table, the thickness of the Cu6Sn5 diffusion layer of the sample after heat treatment can reach 178pm.

[0046] Comparative Example 2

[0047] The bronze stage heat treatment sample of 210°C, 50h / 410°C, 25h was prepared, specifically: the oxygen-free copper sleeve was pickled with 10% nitric acid, the oxygen-free copper sleeve, tin rod, and niobium rod after pickling were ultrasonically cleaned with anhydrous ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 10 minutes, and assembled into Figure 1 as shown in the structure for standby.

[0048] The assembled body after drying was subjected to multi-pass drawing using a chain type cold automatic drawing machine, with a die deformation of 0.5-1mm per pass, and the original outer diameter of the assembled body was 30mm and drawn to an outer diameter of less than 7mm. In order to reduce the friction between the die and the assembled body, the die should be oiled before each drawing pass. The final wire diameter was 6.3mm, and the length was 1500mm.

[0049] A length of 80mm of the wire was cut in the middle using a wire cutting device for heat treatment. It was placed in a vacuum atmosphere heat treatment furnace, vacuumed to 10 -2The temperature was raised at a rate of 5°C / min, and the temperature was raised from room temperature to 210°C, and the temperature was kept at 210°C for 3000 min; the temperature was raised at a rate of 5°C / min, and the temperature was raised from 210°C to 410°C, and the temperature was kept at 410°C for 1500 min, and the sample was taken after the furnace was cooled to below 100°C. As shown in Table 1, the thickness of the Cu6Sn5 diffusion layer was 8 μm. Figure 2 As shown in Table 2, the Cu6Sn5 diffusion layer was uneven, and the thickness of the Cu6Sn5 diffusion layer was only 8 μm. Figure 5 As shown in Table 2, the Cu6Sn5 diffusion layer was uneven, and the thickness of the Cu6Sn5 diffusion layer was only 8 μm.

[0050] Example 2

[0051] The bronze stage heat treatment sample after the electrical pulse was prepared by being kept at 190°C for 50 h and being kept at 405°C for 25 h. Specifically, the oxygen-free copper sleeve was pickled with 10% nitric acid, and the oxygen-free copper sleeve, the tin rod, and the niobium rod after pickling were ultrasonically cleaned with anhydrous ethanol for 15 min and then ultrasonically cleaned with deionized water for 15 min. After drying, the assembly was prepared as shown in Table 3. Figure 1 The assembly after drying was prepared as shown in Table 3.

[0052] The dried assembly was subjected to multi-pass drawing using a chain type cold automatic drawing machine, and the die deformation of each pass was 0.5-1 mm (the die deformation of each pass was different). The original outer diameter of the assembly was 50 mm, and the outer diameter was drawn to 6 mm. To reduce the friction between the die and the assembly, the die was oiled before each drawing pass. Finally, a wire with an outer diameter of 6 mm was obtained.

[0053] The middle part of the wire was cut off to obtain a sample with a length of 80 mm, and the sample was subjected to electrical pulse. The two ends of the sample were clamped and fixed in the electrical pulse device, and the pulse voltage was set to 55 V, the pulse frequency was set to 380 Hz, and the pulse time was set to 55 s.

[0054] The sample obtained by the electrical pulse was placed in a vacuum atmosphere heat treatment furnace, and the vacuum was extracted to 10 -2 The temperature was raised at a rate of 10°C / min, and the temperature was raised from room temperature to 190°C, and the temperature was kept at 190°C for 50 h; the temperature was raised at a rate of 10°C / min, and the temperature was raised from 190°C to 405°C, and the temperature was kept at 405°C for 25 h, and the sample was taken after the furnace was cooled to below 100°C.

[0055] Example 3

[0056] The bronze stage heat treatment sample after the electrical pulse was prepared by being kept at 215°C for 50 h and being kept at 420°C for 25 h. Specifically, the oxygen-free copper sleeve was pickled with 10% nitric acid, and the oxygen-free copper sleeve, the tin rod, and the niobium rod after pickling were ultrasonically cleaned with anhydrous ethanol for 12 min and then ultrasonically cleaned with deionized water for 12 min. After drying, the assembly was prepared as shown in Table 4. Figure 1 The assembly after drying was prepared as shown in Table 4.

[0057] The dried assembly is subjected to multi-pass drawing using a chain automatic cold drawing machine, the die deformation of each pass is 0.5-1 mm (the die deformation of each pass is different), the original outer diameter of the assembly is 40 mm, and the outer diameter is drawn to 7 mm, in order to reduce the friction between the die and the assembly, the die should be oiled before each drawing.

[0058] A 80 mm long sample is cut from the middle of the wire using a wire cutting device for electric pulse. The two ends of the sample are connected to the clamping and fixing of the electric pulse device, the pulse voltage is set to 50 V, the pulse frequency is 350 Hz, and the pulse time is 60 s, and the electric pulse is carried out.

[0059] The sample obtained by electric pulse is placed in a vacuum atmosphere heat treatment furnace, vacuumized to 10 -2 Then, the temperature rising speed is 8℃ / min, the room temperature is raised to 215℃, 215℃ is kept for 50h, the temperature rising speed is 8℃ / min, 215℃ is raised to 420℃, 420℃ is kept for 25h, and the sample is taken out after the furnace is cooled to below 100℃.

[0060] Example 4

[0061] The difference from example 1 is that the electric pulse process parameters are: pulse voltage 58v, pulse frequency 360Hz, pulse time 52s.

[0062] Example 5

[0063] The difference from example 1 is that the electric pulse process parameters are: pulse voltage 50v, pulse frequency 360Hz, pulse time 58s.

[0064] Example 6

[0065] The difference from example 1 is that the heat treatment parameters are: the temperature rising speed of the vacuum atmosphere heat treatment furnace in the temperature rising stage is 8℃ / min, so that the heat treatment temperature is raised from room temperature to 200℃, and kept at this temperature for 50h; then raised to 415℃, kept at this temperature for 25h, and the furnace is cooled.

[0066] The application realizes the bronze of Nb3Sn superconducting wire based on electric pulse treatment, provides a new process for phase formation heat treatment of Nb3Sn wire prepared by internal tin method, that is, electric pulse-short bronze heat treatment process. On the one hand, electric pulse has the characteristics of rapid temperature rise and fall, can realize bronze heat treatment of Nb3Sn wire precursor in a short time, save heat treatment time, and improve the preparation efficiency of Nb3Sn superconducting wire. On the other hand, pulse current can generate very high Joule heat and electric power wind effect in a very short time, accelerate the element diffusion in Cu-Sn system, promote Cu6Sn5 nucleation, and improve the thickness of Cu6Sn5 diffusion layer, so as to provide sufficient reaction source for subsequent Nb3Sn phase formation.

[0067] The application is based on the method for realizing bronze processing of Nb3Sn superconducting wire by electric pulse treatment, and the deformation amount is limited to 80% to 85% after multi-pass drawing of the Cu / Sn / Nb assembly. For the assembly, the deformation amount in the range can ensure the coordinated deformation of each component in the plastic deformation process, and generate the Nb3Sn precursor wire with uniform deformation; on the other hand, while avoiding the grain size being too large, it provides sufficient driving force for the diffusion of Cu-Sn elements in the subsequent bronze processing heat treatment process of the Nb3Sn wire precursor.

[0068] The application is based on the method for realizing bronze processing of Nb3Sn superconducting wire by electric pulse treatment, and the deformation amount is limited to 80% to 85% after multi-pass drawing of the Cu / Sn / Nb assembly. For the assembly, the deformation amount in the range can ensure the coordinated deformation of each component in the plastic deformation process, and generate the Nb3Sn precursor wire with uniform deformation; on the other hand, while avoiding the grain size being too large, it provides sufficient driving force for the diffusion of Cu-Sn elements in the subsequent bronze processing heat treatment process of the Nb3Sn wire precursor.

[0069] The electric pulse-short-time bronze processing heat treatment process adopted by the application can effectively shorten the Nb3Sn phase formation heat treatment time, break through the limitation of long conventional heat treatment time and low efficiency, generate CuSn compound matrix in a shorter time, realize bronze processing, control bronze processing organization, provide sufficient reaction source for the final phase formation of Nb3Sn at high temperature, improve the content of Nb3Sn, and improve the current carrying capacity of Nb3Sn wire.

Claims

1. A method for rapidly bronze-converting Nb3Sn superconducting wires based on electrical pulse processing, characterized in that: Specifically, the steps include the following: Step 1: Fabricate Nb3Sn precursor wire using the internal tin method; The specific process of step 1 is as follows: Step 1.1: Open a circular hole A and four circular holes B along the axis of the copper rod. Circular hole A is located at the center of the copper rod, and the four circular holes B are evenly distributed around circular hole A. Step 1.2: Pickle the copper rod, then ultrasonically clean the niobium rod, tin rod and pickled copper rod together and dry them. Step 1.3: Insert the dried tin rod into the round hole A, and insert the four dried niobium rods into the four round holes B respectively to obtain the Cu / Sn / Nb assembly. Step 1.4: Use a cold drawing machine to perform a multi-pass drawing process so that the overall deformation of the Cu / Sn / Nb assembly reaches 80%-85%, thus obtaining the Nb3Sn precursor wire. Step 2: The Nb3Sn precursor wire prepared in Step 1 is subjected to electrical pulse treatment to obtain an electrical pulsed wire sample; the specific process of Step 2 is as follows: a sample with a length of 80mm is cut from the middle of the Nb3Sn precursor wire prepared in Step 1 and clamped in an electrical pulse device for electrical pulse treatment. In step 2, the electrical pulse processing parameters are: pulse voltage 50-60V, pulse frequency 350-400Hz, and pulse time 50-60s. Step 3: The sample obtained in Step 2 after electrical pulse treatment is heat-treated in a vacuum atmosphere heat treatment furnace to obtain Nb3Sn wire after bronze heat treatment. The specific process of Step 3 is as follows: the heating rate of the vacuum atmosphere heat treatment furnace is maintained at 5-10℃ / min during the heating stage, so that the heat treatment temperature is raised from room temperature to 190℃-215℃, and held at this temperature for 50h; then the temperature is raised to 405℃-420℃, and held at this temperature for 25h, and then the furnace is cooled.

2. The method for rapidly bronze-forming Nb3Sn superconducting wires based on electrical pulse processing according to claim 1, characterized in that: In step 1.2, the outer diameter of the copper rod is 30-50 mm; the diameter of the tin rod is 12-20 mm; and the diameter of the niobium rod is 5-10 mm.

3. The method for rapidly bronze-forming Nb3Sn superconducting wires based on electrical pulse processing according to claim 1, characterized in that: In step 1.2, the ultrasonic cleaning time is 10-15 minutes.

4. The method for rapidly bronze-forming Nb3Sn superconducting wires based on electrical pulse processing according to claim 1, characterized in that: In step 1.4, the diameter deformation is 0.5-1 mm per pass.

Images