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

Abstract

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

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting phase preparation process optimization, and relates to a method for quickly realizing bronzeization of Nb3Sn superconducting wire based on electric pulse processing. Background Art

[0002] The Nb3Sn superconducting wire produced by the internal tin method has an extremely high critical current density, up to 3000A / mm 2 Therefore, the internal tin method has become the preferred way to commercially prepare Nb3Sn wire. The process flow of the internal tin method can be divided into two stages. The first stage is the preparation stage of Nb3Sn wire precursor: the Cu tube, Nb rod and Sn rod are assembled and bundled to obtain Cu / Sn / Nb billet. The second stage is the long-range phase heat treatment stage of Nb3Sn wire precursor: the Nb3Sn precursor first undergoes a Cu-Sn chemical reaction at medium and low temperature (185℃~445℃) for more than 100 hours to generate the Cu-Sn compound Cu6Sn5 required for Nb3Sn phase formation, completing the bronze heat treatment stage; finally, at a higher reaction temperature (600℃~750℃), the Cu6Sn5 generated in the medium and low temperature stage reacts with the Nb rod for more than 50 hours to generate Nb3Sn with superconducting properties, completing the Nb3Sn phase heat treatment. Therefore, the key to achieving Nb3Sn phase formation and improving Nb3Sn superconducting properties is to perform bronze heat treatment on Nb3Sn wire precursor, generate Cu6Sn5 and increase its content. However, the total bronze heat treatment time of Nb3Sn wire precursor can reach more than 100 hours, which makes the phase formation of Nb3Sn wire precursor have the limitations of long time and low efficiency. In addition, the long-range bronze heat treatment also makes the Cu-Sn chemical reaction process difficult to control, resulting in the Cu-Sn phase formation process with defects such as uncontrollable product phase composition, easy generation of harmful phases, and large grain size of the organization, which reduces the Cu6Sn5 content, affects the subsequent Nb3Sn phase formation ability, and weakens the superconducting properties of the finished wire.

[0003] Electric pulse treatment has the characteristics of rapid temperature rise and fall. Through this treatment, a large amount of Joule heat and electron wind effect generated by pulse current can be applied to the metal to achieve the regulation of the type, morphology and size of the ordered phase. Introducing a pulsed electric field during the bronze heat treatment of the Nb3Sn wire precursor can accelerate the diffusion of elements in the Cu-Sn system. The pulse energy can achieve the regulation of the Cu6Sn5 phase content through element distribution, promote the nucleation of Cu6Sn5, increase the thickness of the Cu6Sn5 diffusion layer, and provide sufficient reaction sources for the subsequent Nb3Sn phase formation. Therefore, accelerating the bronze heat treatment time by electric pulses plays an important role in improving the preparation efficiency of Nb3Sn wire, regulating the microstructure morphology of the bronze stage, and preparing high-current-carrying Nb3Sn wire superconductors. Summary of the invention

[0004] The purpose of the present invention is to provide a method for quickly realizing bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment, which solves the problem of long phase heat treatment time in the existing internal tin method for preparing Nb3Sn wire.

[0005] The technical solution adopted by the present invention is a method for quickly realizing bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment, which specifically comprises the following steps: Step 1, preparing Nb3Sn precursor wire by internal tin method; Step 2, subjecting the Nb3Sn precursor wire prepared in step 1 to an electric pulse treatment to obtain a wire sample after the electric pulse treatment; Step 3, heat-treating the electric pulse sample obtained in step 2 in a vacuum atmosphere heat treatment furnace to obtain a Nb3Sn wire after bronze heat treatment.

[0006] The present invention is also characterized in that: The specific process of step 1 is: Step 1.1, a circular hole A and four circular holes B are respectively opened along the axial direction of the copper rod, wherein the circular hole A is located at the center of the copper rod, and the four circular holes B are evenly distributed around the circular hole A; Step 1.2, pickling the copper rod, and then ultrasonically cleaning the niobium rod, the tin rod and the pickled copper rod together and then drying; Step 1.3, placing the dried tin rod into the circular hole A, and placing four dried niobium rods into four circular holes B respectively, to obtain a 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%, that is, the Nb3Sn precursor wire is obtained.

[0007] 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.

[0008] In step 1.2, the ultrasonic cleaning time is 10 to 15 minutes.

[0009] In step 1.4, the diameter deformation in each pass is 0.5-1mm.

[0010] The specific process of step 2 is: a sample with a length of 80 mm is cut from the middle part of the Nb3Sn precursor wire produced in step 1, and clamped on an electric pulse device for electric pulse.

[0011] In step 2, the parameters of the electric pulse treatment are: pulse voltage 50-60V, pulse frequency 350-400Hz, and pulse time 50-60s.

[0012] The specific process of step 3 is: maintain the heating rate of the vacuum atmosphere heat treatment furnace at 5-10℃ / min in the heating stage, so that the heat treatment temperature is raised from room temperature to 190℃-215℃, and keep it at this temperature for 50h; then heat it to 405℃-420℃, keep it at this temperature for 25h, and cool the furnace.

[0013] The beneficial effect of the present invention is that the present invention provides a new process for the heat treatment of Nb3Sn wire phase formation by the internal tin method - electric pulse-short-time bronze heat treatment process. On the one hand, the electric pulse has the characteristics of rapid temperature rise and fall, and can perform bronze heat treatment on the Nb3Sn wire precursor in a short time, saving heat treatment time and improving the preparation efficiency of Nb3Sn superconducting wire. On the other hand, the pulse current can generate extremely high Joule heat and electric wind effect in a very short time, accelerate the diffusion of elements in the Cu-Sn system, promote the nucleation of Cu6Sn5, increase the thickness of the Cu6Sn5 diffusion layer, and provide sufficient reaction sources for the subsequent Nb3Sn phase formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a Cu / Sn / Nb assembly according to the method of the present invention for rapidly achieving bronzeization of Nb3Sn superconducting wire based on electric pulse treatment; Figure 2 It is a comparison diagram of the sample preparation process of Example 1 and Comparative Examples 1 and 2 of the method for quickly realizing bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment of the present invention; Figure 3 This is a schematic diagram of the diffusion state of Cu6Sn5 after the electric pulse is applied and the heat treatment time of the bronze stage is shortened in Example 1 of the method for quickly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment; Figure 4 It is a schematic diagram of the diffusion state of Cu6Sn5 after heat treatment in the conventional bronze stage in Comparative Example 1 of the method for rapidly achieving bronzeization of Nb3Sn superconducting wire based on electric pulse treatment of the present invention; Figure 5 It is a schematic diagram of the diffusion state of Cu6Sn5 after the heat treatment time of the bronze stage is shortened without electric pulse in comparative example 2 of the method for quickly achieving bronzeization of Nb3Sn superconducting wire based on electric pulse treatment of the present invention. DETAILED DESCRIPTION

[0015] The following is a detailed description in conjunction with specific implementation methods.

[0016] The present invention provides a method for rapidly bronzeizing Nb3Sn superconducting wire based on electric pulse treatment, which is specifically carried out in the following steps: Step 1: pre-treat the raw materials: pickling, ultrasonic cleaning. Dry and assemble the pre-treated samples, and perform multiple drawing on the assembly to obtain internal tin method Nb3Sn wire with suitable size and uniform structure; In step 1, the outer diameter of the copper rod is 30-50mm and the height is 150-200mm; the diameter of the niobium rod is 5-10mm and the height is 150-200mm; the diameter of the tin rod is 12-20mm and the height is 150-200mm. The copper rod is pickled, and the copper rod, niobium rod and tin rod are ultrasonically cleaned for 10-15 minutes. After drying, they are drawn using a cold drawing machine at a drawing speed of 0.5mm / s, and the diameter deformation of each pass is 0.5-1mm. Multiple drawing passes are performed until the deformation reaches 80%-85%, and the final outer diameter of the copper rod is reduced to 6-7mm.

[0017] Step 2, the wire obtained by drawing in step 1 is cut to obtain the middle part, and then subjected to electric pulse treatment to obtain a wire sample after electric pulse treatment; In step 2, the specific process of electric pulse is: a sample with a length of 80 mm is cut from the middle of the drawn wire, and clamped on the electric pulse device for electric pulse. The electric pulse process parameters are: pulse voltage 50-60V, pulse frequency 350-400Hz, and pulse time 50-60s.

[0018] Step 3: The sample after electric pulse obtained in step 2 is heat treated in a vacuum atmosphere heat treatment furnace for the Cu-Sn bronze reaction stage. Compared with the conventional process, the bronze heat treatment time is shortened to 75 hours, and the Nb3Sn wire with shortened bronze heat treatment time is obtained.

[0019] In step 3, the bronze heat treatment process is to place the electric pulse sample into a vacuum atmosphere heat treatment furnace and control the vacuum degree to 10 -2 Heat treatment parameters are: keep the vacuum atmosphere heat treatment furnace at a heating rate of 5-10℃ / min in the heating stage, so that the heat treatment temperature rises from room temperature to 190℃-215℃, and keeps at this temperature for 50h; then heat it to 405℃-420℃, keep at this temperature for 25h, and cool the furnace.

[0020] The present invention ensures the grain size and provides deformation energy storage, laying a foundation for the subsequent improvement of the performance of Nb3Sn superconducting wires. Through this fine process control, the present invention not only shortens the bronze heat treatment time of Nb3Sn superconducting wires, but also increases the diffusion layer thickness of Cu6Sn5, providing a reaction source for the subsequent generation of high-current-carrying Nb3Sn superconducting wires, laying a foundation for improving the superconducting performance of Nb3Sn superconducting wires.

[0021] The method of the present invention for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment is further explained in detail below through specific embodiments.

[0022] Example 1 The bronze stage heat treatment samples were prepared by heat preservation at 210℃ for 50h / 410℃ for 25h after electric pulse. Specifically, the oxygen-free copper sheath was pickled with 10% nitric acid, and the oxygen-free copper sheath, tin rod and niobium rod were ultrasonically cleaned with anhydrous ethanol for 10min, and then ultrasonically cleaned with deionized water for 10min, and then dried and assembled. Figure 1 The structure shown is for standby use.

[0023] The dried assembly is drawn in multiple passes using a chain-type automatic cold drawing machine. The mold deformation in each pass is 0.5-1mm (the mold deformation in each pass is different). The original outer diameter of the assembly is 30mm and the outer diameter is drawn to less than 7mm. In order to reduce the friction between the mold and the assembly, the mold should be oiled before each drawing. The final wire has an outer diameter of 6.3mm and a length of 1500mm.

[0024] Use wire cutting equipment to cut a sample of 80 mm in length from the middle of the wire for electric pulse. Connect both ends of the sample to the electric pulse equipment for clamping and fixing, set the pulse voltage to 60 V, the pulse frequency to 400 Hz, and the pulse time to 50 s for electric pulse.

[0025] The sample obtained by electric pulse was placed in a vacuum atmosphere heat treatment furnace and evacuated to 10 -2 Below, heating rate 5℃ / min, room temperature to 210℃, 210℃ heat preservation for 3000min; heating rate 5℃ / min, 210℃ to 410℃, 410℃ heat preservation for 1500min, cooling with the furnace to below 100℃ and taking samples. Figure 2 The electrical pulse and heat treatment process of this embodiment is shown. Figure 3 As shown, the average thickness of the Cu6Sn5 diffusion layer of the sample can reach 182µm.

[0026] Comparative Example 1 The bronze stage heat treatment samples were prepared at 210℃, heat preservation for 50h / 410℃, heat preservation for 50h. Specifically, the oxygen-free copper sheath was pickled with 10% nitric acid, and the oxygen-free copper sheath, tin rod, and niobium rod after pickling were ultrasonically cleaned with anhydrous ethanol for 10min, and then ultrasonically cleaned with deionized water for 10min, and then dried and assembled into Figure 1 The structure shown is for standby use.

[0027] The dried assembly is drawn using a chain-type cold automatic cold drawing machine for multiple passes. The die is deformed by 0.5-1mm in each pass. The original outer diameter of the assembly is 30mm and drawn to an outer diameter less than 7mm. In order to reduce the friction between the die and the assembly, the die should be oiled before each drawing. The final wire has an outer diameter of 6.3mm and a length of 1500mm.

[0028] Use wire cutting equipment to cut a sample of 80 mm in length from the middle of the wire for heat treatment. Place it in a vacuum atmosphere heat treatment furnace and evacuate to 10 -2 Below, heating rate 5℃ / min, room temperature to 210℃, 210℃ heat preservation for 3000min; heating rate 5℃ / min, 210℃ to 410℃, 410℃ heat preservation for 3000min, cooling with the furnace to below 100 degrees and sampling. Figure 2 The heat treatment process of this comparative example is shown. Figure 4 As shown in the figure, the diffusion layer thickness of the Cu6Sn5 sample can reach 178µm after heat treatment.

[0029] Comparative Example 2 The bronze stage heat treatment samples were prepared at 210℃, 50h / 410℃, 25h. Specifically, the oxygen-free copper sheath was pickled with 10% nitric acid, and the pickled oxygen-free copper sheath, tin rod, and niobium rod were ultrasonically cleaned with anhydrous ethanol for 10 minutes, and then ultrasonically cleaned with deionized water for 10 minutes, and then dried and assembled into Figure 1 The structure shown is for standby use.

[0030] The dried assembly is drawn using a chain-type cold automatic cold drawing machine for multiple passes. The die is deformed by 0.5-1mm in each pass. The original outer diameter of the assembly is 30mm and drawn to an outer diameter less than 7mm. In order to reduce the friction between the die and the assembly, the die should be oiled before each drawing. The final wire has an outer diameter of 6.3mm and a length of 1500mm.

[0031] Use wire cutting equipment to cut a sample of 80 mm in length from the middle of the wire for heat treatment. Place it in a vacuum atmosphere heat treatment furnace and evacuate to 10 -2 Below, heating rate 5℃ / min, room temperature to 210℃, 210℃ heat preservation for 3000min; heating rate 5℃ / min, 210℃ to 410℃, 410℃ heat preservation for 1500min, cooling with the furnace to below 100℃ and taking samples. Figure 2 The heat treatment process of this comparative example is shown. Figure 5 As shown, the Cu6Sn5 diffusion layer of the sample is uneven and the thickness at the farthest diffusion distance is only 8µm.

[0032] Example 2 The bronze stage heat treatment samples were prepared by heat preservation at 190℃ for 50h / 405℃ for 25h after electric pulse. Specifically, the oxygen-free copper sheath was pickled with 10% nitric acid, and the oxygen-free copper sheath, tin rod, and niobium rod were ultrasonically cleaned with anhydrous ethanol for 15min, and then ultrasonically cleaned with deionized water for 15min, and then dried and assembled. Figure 1 The structure shown is for standby use.

[0033] The dried assembly is drawn in multiple passes using a chain-type cold automatic cold drawing machine. The mold deformation in each pass is 0.5-1mm (the mold deformation in each pass is different). The original outer diameter of the assembly is 50mm and drawn to an outer diameter of 6mm. In order to reduce the friction between the mold and the assembly, the mold should be oiled before each drawing. The final wire diameter is 6mm.

[0034] Use wire cutting equipment to cut a sample of 80 mm in length from the middle of the wire for electric pulse. Connect both ends of the sample to the electric pulse equipment for clamping and fixing, set the pulse voltage to 55 V, the pulse frequency to 380 Hz, and the pulse time to 55 s for electric pulse.

[0035] The sample obtained by electric pulse was placed in a vacuum atmosphere heat treatment furnace and evacuated to 10 -2 Below, the temperature is increased at a rate of 10℃ / min from room temperature to 190℃, and kept at 190℃ for 50h; the temperature is increased at a rate of 10℃ / min from 190℃ to 405℃, and kept at 405℃ for 25h, and the furnace is cooled to below 100°C for sampling.

[0036] Example 3 The bronze stage heat treatment samples were prepared by heat preservation at 215℃ for 50h / 420℃ for 25h after electric pulse. Specifically, the oxygen-free copper sheath was pickled with 10% nitric acid, and the oxygen-free copper sheath, tin rod, and niobium rod were ultrasonically cleaned with anhydrous ethanol for 12min, and then ultrasonically cleaned with deionized water for 12min, and then dried and assembled. Figure 1 The structure shown is for standby use.

[0037] The dried assembly is drawn in multiple passes using a chain-type automatic cold drawing machine. The mold deformation in each pass is 0.5-1mm (the mold deformation in each pass is different). The original outer diameter of the assembly is 40mm and drawn to an outer diameter of 7mm. In order to reduce the friction between the mold and the assembly, the mold should be oiled before each drawing. The final wire diameter is 7mm.

[0038] Use wire cutting equipment to cut a sample of 80 mm in length from the middle of the wire for electric pulse. Connect both ends of the sample to the electric pulse equipment for clamping and fixing, set the pulse voltage to 50 V, the pulse frequency to 350 Hz, and the pulse time to 60 s for electric pulse.

[0039] The sample obtained by electric pulse was placed in a vacuum atmosphere heat treatment furnace and evacuated to 10 -2 Below, the temperature is increased at a rate of 8°C / min from room temperature to 215°C, and kept at 215°C for 50 hours; the temperature is increased at a rate of 8°C / min from 215°C to 420°C, and kept at 420°C for 25 hours, and the furnace is cooled to below 100° for sampling.

[0040] Example 4 The difference from Example 1 is that the electric pulse process parameters are: pulse voltage 58V, pulse frequency 360Hz, and pulse time 52s.

[0041] Example 5 The difference from Example 1 is that the electric pulse process parameters are: pulse voltage 50V, pulse frequency 360Hz, and pulse time 58s.

[0042] Example 6 The difference from Example 1 is that the heat treatment parameters are: maintain the heating rate of the vacuum atmosphere heat treatment furnace at 8°C / min in the heating stage, so that the heat treatment temperature is raised from room temperature to 200°C, and kept at this temperature for 50 hours; then raised to 415°C, kept at this temperature for 25 hours, and the furnace is cooled.

[0043] The present invention is based on a method for quickly achieving bronzeization of Nb3Sn superconducting wires by electric pulse treatment, and provides a new process for the heat treatment of Nb3Sn wire phase formation by the internal tin method - electric pulse-short-time bronzeization heat treatment process. On the one hand, electric pulses have the characteristics of rapid temperature rise and fall, and can perform bronze heat treatment on Nb3Sn wire precursors in a short time, saving heat treatment time and improving the efficiency of Nb3Sn superconducting wire preparation. On the other hand, pulse current can generate extremely high Joule heat and electric wind effect in a very short time, accelerate the diffusion of elements in the Cu-Sn system, promote Cu6Sn5 nucleation, increase the thickness of the Cu6Sn5 diffusion layer, and provide sufficient reaction sources for subsequent Nb3Sn phase formation.

[0044] The present invention is based on a method for rapidly achieving bronzeization of Nb3Sn superconducting wires by electric pulse treatment. After multiple drawing passes of the Cu / Sn / Nb assembly, the maximum deformation is limited to 80% to 85%. For the assembly, the deformation within this range can ensure the coordinated deformation of each component during the plastic deformation process and generate a uniformly deformed Nb3Sn precursor wire; on the other hand, it can prevent the grain size from being too large while providing sufficient driving force for the diffusion of Cu-Sn elements during the subsequent bronze heat treatment of the Nb3Sn wire precursor.

[0045] The present invention is a method for quickly realizing the bronzeization of Nb3Sn superconducting wire based on electric pulse treatment. In the bronzeization heat treatment process, a heating rate of 5-10°C / min is selected, and the Nb3Sn superconducting wire precursor is heated to 190°C to 215°C for heat preservation; then the same heating rate is maintained, and the temperature is raised to 405°C to 420°C for continued heat preservation. For the Nb3Sn superconducting wire precursor, the heating rate can prevent the temperature difference between the inside and outside of the workpiece from being too large, and the multi-component structure from thermal cracking due to stress concentration, thereby reducing the temperature gradient; on the other hand, it prevents the grain size of the generated phase from being too large during the heating process, thereby reducing the plastic toughness of the Nb3Sn wire in subsequent practical applications. The selection of a phase formation temperature range of 190°C to 215°C provides sufficient driving force for the diffusion of each component, and the diffusion capacity of the Cu-Sn element is improved, thereby generating a CuSn binary ordered phase. Selecting 405℃~420℃ to continue the phase heat treatment can regulate the organization of the CuSn binary ordered phase, avoid the formation of harmful phases, and provide nucleation conditions for the formation of Cu6Sn5. Furnace cooling prevents oxidation of the sample during the cooling process and avoids fracture of the sample during cooling.

[0046] The electric pulse-short-time bronze heat treatment process adopted in the present invention can effectively shorten the heat treatment time of Nb3Sn phase formation, break through the limitations of long conventional heat treatment time and low efficiency, generate CuSn compound matrix in a shorter time, achieve bronze, regulate the bronze structure, provide sufficient reaction source for the final phase formation of Nb3Sn at high temperature, increase Nb3Sn content, and improve the current carrying capacity of Nb3Sn wire.

Claims

1. A method for rapidly achieving bronzeization of Nb3Sn superconducting wire based on electric pulse treatment, characterized in that: The specific steps include: Step 1, preparing Nb3Sn precursor wire by internal tin method; Step 2, subjecting the Nb3Sn precursor wire prepared in step 1 to an electric pulse treatment to obtain a wire sample after the electric pulse treatment; Step 3, heat-treating the electric pulse sample obtained in step 2 in a vacuum atmosphere heat treatment furnace to obtain a Nb3Sn wire after bronze heat treatment.

2. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 1, characterized in that: The specific process of step 1 is as follows: Step 1.1, a circular hole A and four circular holes B are respectively opened along the axis direction of the copper rod, wherein the circular hole A is located at the center of the copper rod, and the four circular holes B are evenly distributed around the circular hole A; Step 1.2, pickling the copper rod, and then ultrasonically cleaning the niobium rod, the tin rod and the pickled copper rod together and then drying; Step 1.3, placing the dried tin rod into the circular hole A, and placing four dried niobium rods into four circular holes B respectively, to obtain a 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%, that is, the Nb3Sn precursor wire is obtained.

3. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 2, characterized in that: In the 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.

4. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 2, characterized in that: In the step 1.2, the ultrasonic cleaning time is 10 to 15 minutes.

5. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 2, characterized in that: In step 1.4, the diameter deformation amount in each pass is 0.5-1 mm.

6. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 2, characterized in that: The specific process of step 2 is: a sample with a length of 80 mm is cut from the middle part of the Nb3Sn precursor wire produced in step 1, and clamped on an electric pulse device for electric pulse.

7. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 6, characterized in that: In step 2, the electric pulse treatment parameters are: pulse voltage 50-60V, pulse frequency 350-400Hz, and pulse time 50-60s.

8. The method for rapidly achieving bronze treatment of Nb3Sn superconducting wire based on electric pulse treatment according to claim 7, characterized in that: The specific process of step 3 is: maintain the heating rate of the vacuum atmosphere heat treatment furnace at 5-10°C / min in the heating stage, so that the heat treatment temperature is heated from room temperature to 190°C-215°C, and keep it at this temperature for 50 hours; then heat it to 405°C-420°C, keep it at this temperature for 25 hours, and cool the furnace.

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