Preparation method of niobium-tin superconducting wire for light-emitting device and niobium-tin superconducting wire

Abstract

The present application discloses a method for preparing a niobium-tin superconducting wire for a light-emitting device and a niobium-tin superconducting wire, and relates to the field of superconducting technology, wherein the method comprises: depositing a rare earth element film on the surface of a SnTi alloy rod to obtain a first rare earth element alloy rod; drilling a hole in the center of the first rare earth element alloy rod, inserting a CuTa alloy rod, and obtaining a second rare earth element alloy rod; inserting the second rare earth element alloy rod into a CuNb composite tube of an inner tin method niobium-tin subcomponent; bundling a plurality of inner tin method niobium-tin subcomponents into a Ta tube and an oxygen-free copper tube to obtain an inner tin method niobium-tin final billet; and stretching the inner tin method niobium-tin final billet to obtain a niobium-tin superconducting wire. The present application deposits a rare earth element film on the surface of a SnTi alloy rod to expand the application scope of the niobium-tin superconducting wire, and due to the presence of the CuTa alloy rod, it is beneficial to stabilize the tensile strength of the wire after the heat treatment process, and prevents damage to the wire caused by bumps.

Description

Technical Field

[0001] The present application relates to the field of superconducting technology, and in particular to a method for preparing a niobium-tin superconducting wire for a light-emitting device and a niobium-tin superconducting wire. Background Art

[0002] Nb3Sn (niobium tin) superconducting wire has a high critical current density and is an important raw material for manufacturing high-field magnets. The internal tin method is one of the main methods for preparing niobium tin superconducting wires. The existing niobium tin superconducting wires have deficiencies in optical properties, which limits their application in the fields of photonics and optoelectronics. At present, the niobium tin superconducting wires with the highest performance and the widest application in the world are all prepared by the internal tin method, which usually adopts the method of inserting SnTi (tin-titanium) alloy rods into internal tin method niobium tin CuNb (copper niobium) composite rods to assemble into internal tin method niobium tin subcomponents, and then the subcomponents are assembled into Ta (tantalum) tubes and oxygen-free copper tubes for multiple drawing to obtain niobium tin composite wires.

[0003] At present, the internal tin method niobium tin subcomponents are mostly assembled using SnTi alloy rods, which do not have good optoelectronic properties, limiting their application in the fields of photonics and optoelectronics. In addition, the internal tin method niobium tin composite wire is brittle after heat treatment and is prone to damage due to collisions, affecting its subsequent application. Summary of the invention

[0004] The embodiments of the present application provide a method for preparing a niobium-tin superconducting wire for a light-emitting device and a niobium-tin superconducting wire, so as to solve the problem that the niobium-tin superconducting wire produced by the internal tin method in the prior art does not have good photoelectric properties and the superconducting wire is brittle after heat treatment.

[0005] On the one hand, the embodiments of the present application provide a method for preparing a niobium-tin superconducting wire for a light-emitting device, comprising:

[0006] Depositing a rare earth element film on the surface of the SnTi alloy rod by a deposition method to obtain a first rare earth element alloy rod;

[0007] Drilling a hole in the center of the first rare earth alloy rod and inserting a CuTa alloy rod into the hole to obtain a second rare earth alloy rod;

[0008] Inserting a second rare earth element alloy rod into an internal tin method niobium three-tin CuNb composite tube to obtain an internal tin method niobium three-tin subcomponent;

[0009] Bundling a plurality of internal tin method niobium tin subcomponents into a Ta tube, and then placing the Ta tube into an oxygen-free copper tube to obtain a final internal tin method niobium tin blank;

[0010] The final niobium-tin billet produced by the internal tin method is stretched to obtain a niobium-tin superconducting wire.

[0011] On the other hand, an embodiment of the present application further provides a niobium-tin superconducting wire for a light-emitting device, wherein the niobium-tin superconducting wire is prepared by the above method.

[0012] The method for preparing the niobium-tin superconducting wire for light-emitting devices and the niobium-tin superconducting wire in the present application have the following advantages:

[0013] A mesh rare earth element film is deposited on the surface of the SnTi alloy rod by a deposition method to obtain a first rare earth element alloy rod, and then a hole is drilled in the center of the rod, and a CuTa alloy rod is inserted into the first rare earth element alloy rod to obtain a second rare earth element alloy rod. In this way, the traditional method of inserting the SnTi alloy rod into the internal tin method niobium three tin CuNb composite rod to assemble the internal tin method niobium three tin subcomponent is changed to using the deposition method to obtain the second rare earth element alloy rod, which is assembled with the internal tin method niobium three tin CuNb composite tube. Due to the presence of the CuTa alloy rod, it is beneficial to stabilize the tensile strength of the wire after the heat treatment process, and prevent the wire from being damaged by collision due to transportation or other reasons after the wire is wound around the magnet for heat treatment. Because the mesh rare earth element film is deposited on the surface of the SnTi alloy rod by a deposition method, the accuracy and quality of the rare earth element film are guaranteed, the application range of niobium three tin superconducting wire is expanded, especially in the fields of photonics and optoelectronics, and its stability and reliability under specific conditions are improved to improve the performance of the internal tin method niobium three tin wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the composition structure of the three tin subcomponents of niobium in the internal tin method provided in the embodiments of the present application.

[0016] Explanation of the accompanying drawings: 1. Internal tin method niobium three-tin CuNb composite tube; 2. Rare earth element film; 3. SnTi alloy rod; 4. CuTa alloy rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] The present application provides a method for preparing a niobium-tin superconducting wire for a light-emitting device, the method comprising the following steps:

[0019] S100, depositing a rare earth element film 2 on the surface of the SnTi alloy rod 3 by a deposition method to obtain a first rare earth element alloy rod.

[0020] For example, before depositing the rare earth element film 2, the SnTi alloy rod 3 needs to be cleaned first. The deposition method used in the embodiment of the present application is physical vapor deposition or chemical vapor deposition.

[0021] If physical vapor deposition is used, the substrate temperature is 20~100°C, the working gas is high-purity argon, the pressure is 0.1~1Pa, the sputtering power of the rare earth element is 50~200W, the deposition time is 30~300min, and the substrate bias is 0~100V. The rare earth element is one of Eu (europium), Dy (dysprosium), and Tb (terbium).

[0022] If chemical vapor deposition is used, the substrate temperature is 20~100°C, the reaction gas is a rare earth metal organic compound, the gas flow rate is 10~300ml / min, the reaction pressure is 0.1~10kPa, and the deposition time is 30~300min.

[0023] Regardless of whether physical vapor deposition or chemical vapor deposition technology is used, the thickness of the deposited rare earth element film 2 is 50~1000μm. Moreover, the rare earth element film 2 is preferably a mesh structure, and of course other shapes with holes can also be used. The structure of the rare earth element film 2 in the embodiment of the present application must have holes so that the internal Sn can flow out from the gap during the heat treatment process, react with Cu at low temperature to form a SnCu mixture, and then continue to react with Nb at a high temperature stage to form niobium tin.

[0024] Furthermore, the size of the SnTi alloy rod 3 is 15-30 mm in diameter and 1000-2500 mm in length.

[0025] S110, drilling a hole in the center of the first rare earth alloy rod, inserting the CuTa alloy rod 4 into the hole, and obtaining a second rare earth alloy rod.

[0026] Exemplarily, a hole is drilled axially at the center of the first rare earth element alloy rod, and the hole obtained by the drilling will pass through both ends of the first rare earth element alloy rod.

[0027] In the embodiment of the present application, before inserting the CuTa alloy rod 4 into the hole of the first rare earth alloy rod, the first rare earth alloy rod needs to be cleaned to remove debris generated during the drilling process.

[0028] Furthermore, the diameter of the drilled hole is 5-20 mm, and the size of the CuTa alloy rod 4 is 4.5-19.5 mm in diameter and 1000-2500 mm in length.

[0029] S120, inserting a second rare earth element alloy rod into the internal tin method niobium three-tin CuNb composite tube 1 to obtain the internal tin method niobium three-tin subcomponent.

[0030] For example, before inserting the second rare earth element alloy rod into the CuNb tin composite tube 1, both the second rare earth element alloy rod and the CuNb tin composite tube 1 need to be cleaned. The CuNb tin composite tube 1 into which the second rare earth element alloy rod is inserted undergoes multiple drawing processes to obtain multiple CuNb tin subcomponents of different shapes. The cross-sectional shapes of these CuNb tin subcomponents can be hexagonal, semicircular, fan-shaped, etc. The cylindrical CuNb tin subcomponents before drawing are as follows: Figure 1 shown.

[0031] Furthermore, the dimensions of the internal tin method niobium three-tin CuNb composite tube 1 are 40-55mm in outer diameter, 16.5-31.5mm in inner diameter, and 800-2200mm in length. Among the internal tin method niobium three-tin subcomponents, the cross-sectional height of the internal tin method niobium three-tin subcomponent with a hexagonal cross-section is 2-15mm, the cross-sectional diameter of the internal tin method niobium three-tin subcomponent with a semicircular cross-section is 2-15mm, and the cross-sectional diameter of the internal tin method niobium three-tin subcomponent with a fan-shaped cross-section is 2-15mm. The lengths of the three internal tin method niobium three-tin subcomponents are all 600-4000mm.

[0032] S130, a plurality of internal tin method niobium tin subcomponents are bundled and loaded into a Ta tube, and then the Ta tube is loaded into an oxygen-free copper tube to obtain a final internal tin method niobium tin blank.

[0033] For example, before loading the niobium tin subcomponent, the Ta tube and the oxygen-free copper tube need to be cleaned. When loading in a cluster, the niobium tin subcomponent with a hexagonal cross section is used near the center of the Ta tube, the niobium tin subcomponent with a semicircular cross section is used near the edge, and the remaining gaps are filled with the niobium tin subcomponent with a fan-shaped cross section, so as to maximize the filling rate inside the Ta tube.

[0034] Furthermore, the outer diameter of the Ta tube is 14.5-59.5 mm, and the length is 600-4000 mm. The outer diameter of the oxygen-free copper tube is 20-75 mm, the inner diameter is 15-60 mm, and the length is 600-4000 mm.

[0035] S140, performing multiple stretching on the final niobium-tin billet produced by the internal tin method to obtain a niobium-tin superconducting wire.

[0036] Exemplarily, the stretching pass processing rate is 2% to 30%, and the stretching speed is 1 to 100 m / min.

[0037] Example 1

[0038] The size of the SnTi alloy rod 3 is selected to be 15 mm in diameter and 1000 mm in length. A mesh rare earth element film 2 is deposited on the surface of the cleaned SnTi alloy rod 3 by physical vapor deposition. The rare earth element is Eu (europium), and the thickness of the Eu film is 50 μm, thereby obtaining a first rare earth element alloy rod. In the deposition process, the substrate temperature is 20°C, the working gas is high-purity argon, the pressure is 0.1 Pa, the sputtering power is 50 W, the deposition time is 30 min, and the substrate bias is 10 V.

[0039] The center of the first rare earth alloy rod is drilled with a diameter of 5 mm, and the CuTa alloy rod 4 is loaded into the cleaned first rare earth alloy rod to obtain a second rare earth alloy rod with a diameter of 4.5 mm and a length of 1000 mm.

[0040] The obtained second rare earth element alloy rod is cleaned and then inserted into the cleaned internal tin method niobium tin CuNb composite tube 1, and internal tin method niobium tin sub-components of different shapes are obtained through multiple drawing processes. The internal tin method niobium tin CuNb composite tube 1 has an outer diameter of 40mm, an inner diameter of 16.5mm, and a length of 800mm. The specifications of the internal tin method niobium tin sub-component after forming are hexagonal with a height of 2mm, a semicircular diameter of 2mm, a fan-shaped diameter of 2mm, and a length of 600mm.

[0041] The obtained internal tin method niobium tin subcomponents are cleaned and bundled and sequentially loaded into the cleaned Ta tube and oxygen-free copper tube to obtain the final internal tin method niobium tin billet, and then stretched multiple times to obtain niobium tin superconducting wire. The specifications of the Ta tube are 14.5mm in outer diameter and 600mm in length; the specifications of the oxygen-free copper tube are 20mm in outer diameter, 15mm in inner diameter and 600mm in length; the stretching pass processing rate is 2%~30%, and the stretching speed is 1~100m / min.

[0042] After the niobium-tin superconducting wire is stretched to a diameter of 0.7 mm, samples are taken every 100 m for heat treatment and then critical current tests are conducted under a 12 T magnetic field. The test results show that the critical current density is maintained at 800 A / mm 2 The luminescence intensity of niobium-tin superconducting wire doped with rare earth elements is 50% higher than that of undoped niobium-tin superconducting wire.

[0043] Example 2

[0044] The SnTi alloy rod 3 is selected to have a diameter of 30 mm and a length of 2500 mm, and a mesh rare earth element film 2 is deposited on the surface of the cleaned SnTi alloy rod 3 using chemical vapor deposition. The rare earth element is Dy (dysprosium), and the thickness of the Dy film is 1000 μm, thereby obtaining a first rare earth element alloy rod. During the chemical vapor deposition process, the substrate temperature is 50°C, the reaction gas is a Dy metal organic compound, the gas flow rate is 50 ml / min, the reaction pressure is 5 kPa, and the deposition time is 100 min.

[0045] The center of the first rare earth alloy rod is drilled with a diameter of 20 mm, and the CuTa alloy rod 4 is loaded into the cleaned first rare earth alloy rod to obtain a second rare earth alloy rod. The size of the CuTa alloy rod 4 is 19.5 mm in diameter and 2500 mm in length.

[0046] The obtained second rare earth element alloy rod is cleaned and then inserted into the cleaned internal tin method niobium three-tin CuNb composite tube 1, and internal tin method niobium three-tin sub-components of different shapes are obtained through multiple drawing processes. The dimensions of the internal tin method niobium three-tin CuNb composite tube 1 are 55mm in outer diameter, 31.5mm in inner diameter, and 2200mm in length. The specifications of the internal tin method niobium three-tin sub-component after forming are hexagonal height 15mm, semicircular diameter 15mm, fan-shaped diameter 15mm, and length 4000mm.

[0047] The obtained internal tin method niobium tin subcomponents are cleaned and bundled and sequentially loaded into the cleaned Ta tube and oxygen-free copper tube to obtain the final internal tin method niobium tin billet, and then stretched multiple times to obtain niobium tin superconducting wire. The specifications of the Ta tube are 59.5mm in diameter and 4000mm in length; the specifications of the oxygen-free copper tube are 75mm in outer diameter, 60mm in inner diameter and 4000mm in length; the stretching pass processing rate is 2%~30%, and the stretching speed is 1~100m / min.

[0048] After the niobium-tin superconducting wire was stretched to a diameter of 0.818 mm, samples were taken every 100 m for heat treatment and then critical current tests were conducted under a 12 T magnetic field. The test results showed that the critical current density remained at 1200 A / mm 2 The luminescence intensity of the niobium-tin superconducting wire doped with rare earth elements is 40% higher than that of the undoped niobium-tin superconducting wire.

[0049] Example 3

[0050] The size of the SnTi alloy rod 3 is selected to be 20 mm in diameter and 2000 mm in length, and a mesh rare earth element film 2 is deposited on the surface of the cleaned SnTi alloy rod 3 by physical vapor deposition. The rare earth element is Tb (terbium), and the thickness of the Tb film is 500 μm, thereby obtaining the first rare earth element alloy rod. During the physical vapor deposition process, the substrate temperature is 100°C, the working gas is high-purity argon, the pressure is 0.5 Pa, the sputtering power is 200 W, the deposition time is 20 min, and the substrate bias is 20 V.

[0051] The center of the first rare earth alloy rod is drilled with a diameter of 10 mm, and the CuTa alloy rod 4 is placed into the cleaned first rare earth alloy rod to obtain a second rare earth alloy rod. The CuTa alloy rod 4 has a diameter of 9.5 mm and a length of 2000 mm.

[0052] The obtained second rare earth element alloy rod is cleaned and then inserted into the cleaned internal tin method niobium tin CuNb composite tube 1, and internal tin method niobium tin sub-components of different shapes are obtained through multiple drawing processes. The dimensions of the internal tin method niobium tin CuNb composite tube 1 are 45mm in outer diameter, 20.5mm in inner diameter, and 2000mm in length. The specifications of the internal tin method niobium tin sub-component after forming are hexagonal height 9mm, semicircular diameter 9mm, fan-shaped diameter 7mm, and length 3000mm.

[0053] The obtained internal tin method niobium tin subcomponents are cleaned and bundled and sequentially loaded into the cleaned Ta tube and oxygen-free copper tube to obtain the final internal tin method niobium tin billet, which is then stretched multiple times to produce niobium tin superconducting wire. The specifications of the Ta tube are 44mm in diameter and 4000mm in length; the specifications of the oxygen-free copper tube are 63mm in outer diameter, 44.5mm in inner diameter, and 4000mm in length; the stretching pass processing rate is 2%~30%, and the stretching speed is 1~100m / min.

[0054] After the niobium-tin superconducting wire was stretched to a diameter of 0.988 mm, samples were taken every 100 m for heat treatment and then tested for critical current under a 12 T magnetic field. The test results showed that the critical current density remained at 1300 A / mm 2 The luminescence intensity of niobium-tin superconducting wire doped with rare earth elements is 30% higher than that of undoped niobium-tin superconducting wire.

[0055] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for preparing a niobium-tin superconducting wire for a light-emitting device, characterized in that: include: Depositing a rare earth element film (2) on the surface of a SnTi alloy rod (3) by a deposition method to obtain a first rare earth element alloy rod; Drilling a hole in the center of the first rare earth element alloy rod and inserting a CuTa alloy rod (4) into the hole to obtain a second rare earth element alloy rod; Inserting the second rare earth element alloy rod into the internal tin method niobium three-tin CuNb composite tube (1) to obtain the internal tin method niobium three-tin subcomponent; Bundling a plurality of the internal tin method niobium tri-tin subcomponents into a Ta tube, and then placing the Ta tube into an oxygen-free copper tube to obtain a final internal tin method niobium tri-tin billet; The final niobium-tin billet produced by the internal tin method is stretched to obtain a niobium-tin superconducting wire.

2. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 1, characterized in that: The deposition method is physical vapor deposition or chemical vapor deposition.

3. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 2, characterized in that: When using physical vapor deposition, the substrate temperature is 20~100°C, the working gas is argon, the pressure is 0.1~1Pa, the sputtering power of the rare earth element is 50~200W, the deposition time is 30~300min, and the substrate bias is 0~100V.

4. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 3, characterized in that: The rare earth element is one of Eu, Dy and Tb.

5. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 2, characterized in that: When using chemical vapor deposition, the substrate temperature is 20~100°C, the reaction gas is a rare earth metal organic compound, the gas flow rate is 10~300ml / min, the reaction pressure is 0.1~10kPa, and the deposition time is 30~300min.

6. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 1, characterized in that: The thickness of the deposited rare earth element film (2) is 50-1000 μm.

7. The method for preparing a niobium-tin superconducting wire for a light-emitting device according to claim 1, characterized in that: The rare earth element film (2) is a mesh structure.

8. A niobium-tin superconducting wire for a light-emitting device, characterized in that: The niobium-tin superconducting wire is prepared by the method described in any one of claims 1-7.

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