CN114959530B - Accelerated Nb 3 Method for diffusing Sn wire rod element and refining crystal grain - Google Patents

Accelerated Nb 3 Method for diffusing Sn wire rod element and refining crystal grain Download PDF

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CN114959530B
CN114959530B CN202210608794.4A CN202210608794A CN114959530B CN 114959530 B CN114959530 B CN 114959530B CN 202210608794 A CN202210608794 A CN 202210608794A CN 114959530 B CN114959530 B CN 114959530B
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CN114959530A (en
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刘向宏
陈建亚
郭强
韩光宇
史一功
闫果
杜予晅
冯勇
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Western Superconducting Technologies Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/04—Single wire
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

The invention relates to an accelerating Nb 3 The method for diffusing and refining the Sn wire rod element comprises the following steps: s1, adding Nb 3 The Sn wire is wound on a superconducting wire critical current sample framework and is placed in a vacuum heat treatment furnace; s2, placing the vacuum heat treatment furnace in the center of the liquid-free helium magnet, and starting a refrigerating system of the liquid-free helium magnet until the ambient temperature of a magnet coil is reduced to 4.20K-4.26K; s3, pair Nb 3 Heat treating the Sn wire while adjusting the magnetic field strength of the liquid helium-free magnet to the heat-treated Nb 3 The Sn wire provides a background magnetic field. The method obviously shortens Nb 3 The heat treatment time of the Sn wire rod is shortened, and Nb is refined 3 Sn crystal grains, and the critical current value of the wire is improved.

Description

Nb for acceleration 3 Sn wire material element diffusion and finenessMethod for crystallizing crystal grains
Technical Field
The invention belongs to Nb 3 The technical field of Sn wire heat treatment, and relates to an accelerated Nb 3 Sn wire material element diffusion and grain refinement.
Background
Nb 3 Sn superconducting wires have a high upper critical magnetic field, and thus are important materials for manufacturing large scientific devices such as large particle accelerators. Nb 3 After the Sn superconducting wire is processed, the Nb, sn and Cu components are mutually independent in the wire, and the wire can generate Nb after one-week heat treatment 3 Sn phase, which makes the wire superconductive. To ensure Nb 3 Nb and Sn elements in the Sn superconducting wire material are fully reacted to generate Nb 3 And in the Sn phase, the heat preservation temperature and the heat preservation time in the heat treatment process of the wire rod need to be strictly controlled within a small fluctuation range, and the longer the heat treatment time is, the greater the control difficulty is, and the greater the risk is. Furthermore, the long-term heat treatment results in a high energy consumption, on the one hand, and the appearance of Nb, on the other hand 3 The growth of Sn crystal grains leads to the reduction of the critical current value of the wire. Therefore, nb is shortened 3 Heat treatment time of Sn superconducting wire and refined Nb 3 Sn grains, increased Nb 3 The critical current value of the Sn wire is one of important problems to be solved in manufacturing scientific devices such as large particle accelerators.
Disclosure of Invention
The object of the present invention is to overcome the disadvantages of the prior art mentioned above and to provide an accelerated Nb 3 Sn wire element diffusion and grain refinement method, which is implemented by applying Nb to Nb 3 Applying a background magnetic field with certain strength at the low-temperature, medium-temperature and high-temperature heat treatment stages of the Sn wire to realize that Nb is in the heat treatment process in a non-contact manner 3 The Sn wire provides extra energy, the diffusion activation energy of metal elements in the wire is improved, the synchronous reaction degree of Nb and Sn elements is enhanced, and therefore the Nb is shortened 3 Heat treatment time of Sn wire rod to refine Nb 3 Sn crystal grains, and the critical current value of the wire is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
accelerated Nb 3 The method for diffusing and refining the Sn wire rod element is characterized by comprising the following steps of:
s1, adding Nb 3 The Sn wire is wound on a superconducting wire critical current sample framework and is placed in a vacuum heat treatment furnace;
s2, placing the vacuum heat treatment furnace in the center of the liquid-free helium magnet, and starting a refrigerating system of the liquid-free helium magnet until the ambient temperature of a magnet coil is reduced to 4.20-4.26K;
s3, pair Nb 3 The Sn wire is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet to the heat-treated Nb 3 The Sn wire provides a background magnetic field.
Further, nb in step S1 3 The diameter of the Sn wire is phi 0.820 mm-1.300 mm.
Further, the heat treatment in step S3 specifically includes: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage.
Further, the temperature of the low-temperature heat treatment stage is 205-215 ℃, and the treatment time is 30-35 h; the temperature of the medium temperature heat treatment stage is 397-403 ℃, and the treatment time is 30-35 h; the temperature of the high-temperature heat treatment stage is 663 to 668 ℃, and the treatment time is 30h to 35h.
Further, the background magnetic field intensity of the low-temperature heat treatment stage is 10T-10.5T; the background magnetic field intensity in the medium temperature heat treatment stage is 10.5T-11T; the magnetic field intensity in the high-temperature heat treatment stage is 11T-12T.
Further, the steps further include: testing of Nb Heat treated in step S3 3 The critical current value of the Sn wire rod was measured, and the measurement result was compared with the critical current value of a sample which was heat-treated according to a standard protocol without applying a strong magnetic field.
Further, the three heat treatment stages without applying the strong magnetic field comprise a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage is 205-215 ℃, and the treatment time is 48-49 hours; the temperature of the medium temperature heat treatment stage is 397-403 ℃, and the treatment time is 48-49 h; the temperature of the high-temperature heat treatment stage is 663 to 668 ℃, and the treatment time is 49h to 51h.
Compared with the prior art, the invention has the following beneficial effects:
accelerated Nb 3 A method for diffusing Sn wire material element and refining crystal grain, which is characterized in that Nb is added 3 The Sn wire is respectively applied with a background magnetic field with certain strength in the low-temperature, medium-temperature and high-temperature heat treatment stages, so that metal atoms in the wire can obtain extra energy from the magnetic field without contact, the diffusion activation energy of Nb, sn and Cu atoms is enhanced, the element diffusion in the wire is accelerated, and the Nb is obviously shortened 3 The heat treatment time of the Sn wire rod is prolonged, the synchronous reaction degree of Nb and Sn elements in the wire rod is improved, and the refinement of Nb is realized 3 Sn crystal grains, and the critical current value of the wire is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is an Nb of the present invention 3 Schematic diagram of Sn wire in the heat treatment process of the liquid helium-free magnet;
wherein: 1. a liquid helium free magnet; 2. a vacuum heat treatment furnace; 3. a superconducting wire critical current sample skeleton; 4. nb 3 And a Sn wire.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Nb for acceleration 3 The method for diffusing and refining the Sn wire rod element comprises the following steps:
s1, adding Nb 3 The Sn wire 4 is wound on the superconducting wire critical current sample framework 3 and is placed in the vacuum heat treatment furnace 2; nb 3 The diameter of the Sn wire 4 is phi 0.820 mm-1.300 mm.
S2, placing the vacuum heat treatment furnace 2 in the center of the liquid-free helium magnet 1, and starting a refrigerating system of the liquid-free helium magnet 1 until the ambient temperature of a magnet coil is reduced to 4.20K-4.26K;
s3, pair Nb 3 The Sn wire 4 is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet 1 to the Nb being heat-treated 3 The Sn wire 4 provides a background magnetic field; the heat treatment specifically includes: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage. The temperature of the low-temperature heat treatment stage is 205-215 ℃, the treatment time is 30-35 h, and the background magnetic field intensity is 10-10.5T; the temperature of the medium-temperature heat treatment stage is 397-403 ℃, the treatment time is 30-35 h, and the background magnetic field intensity is 10.5-11T; the temperature of the high-temperature heat treatment stage is 663 to 668 ℃, the treatment time is 30 to 35 hours, and the background magnetic field intensity is 11 to 12T.
S4, testing the Nb heat-treated in the step S3 3 The critical current value of the Sn wire 1, and the test result was compared with the critical current value of a sample that was heat-treated according to a standard protocol without applying a strong magnetic field. Wherein the three heat treatment stages without strong magnetic field comprise a low temperature heat treatment stage, a medium temperature heat treatment stage and a high temperature heat treatment stage, and the temperature of the low temperature heat treatment stage isThe treatment time is between 48 and 49 hours at the temperature of between 205 and 215 ℃; the temperature of the low-temperature heat treatment stage is 397-403 ℃, and the treatment time is 48-49 h; the temperature of the low-temperature heat treatment stage is 663 to 668 ℃, and the treatment time is 49h to 51h.
The following is described with reference to specific process procedures:
example 1:
step 1, strictly following the winding process of a critical current sample of a superconducting wire, and winding Nb with the specification of phi 0.820mm 3 The Sn wire 4 is wound on the superconducting wire critical current sample framework 3 and is placed in the vacuum heat treatment furnace 2;
step 2, placing the vacuum heat treatment furnace 2 in the center of the liquid-free helium magnet, and starting a refrigerating system of the liquid-free helium magnet 1 until the ambient temperature of a magnet coil is reduced to 4.20-4.26K;
step 3, for Nb 3 The Sn wire 4 is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet 1 to the heat-treated Nb 3 The Sn wire 4 provides a background magnetic field; the heat treatment specifically includes: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage. The temperature of the low-temperature heat treatment stage is 205 ℃, the treatment time is 30h, and the background magnetic field intensity is 10T; the temperature of the medium-temperature heat treatment stage is 397 ℃, the treatment time is 30h, and the background magnetic field intensity is 10.5T; the temperature of the high-temperature heat treatment stage is 663 ℃, the treatment time is 30h, and the background magnetic field intensity is 11T.
Step 4, testing the critical current value of the sample heat-treated in step 3 under the condition of 4.2K/12T, and testing the Nb heat-treated in step S3 3 The critical current value of the Sn wire 1 was measured, and the measurement result was compared with the critical current value of a sample which was heat-treated according to a standard protocol without applying a strong magnetic field. The three heat treatment stages without strong magnetic field comprise a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage is 205 ℃, and the treatment time is 49 hours; the temperature of the medium temperature heat treatment stage is 397 ℃, and the treatment time is 49h; the temperature of the high-temperature heat treatment stage is 663 ℃, and the treatment time is 49h. And heat-treating the test result with a standard system without applying a background magnetic fieldThe critical current values of the samples were compared and the results are shown in table 1:
TABLE 1
Figure BDA0003671317430000061
By mixing Nb of phi 0.820mm 3 The Sn superconducting wire is placed in a strong magnetic field for heat treatment, the heat preservation time of the Sn superconducting wire at three stages of low temperature (205 ℃), medium temperature (397 ℃) and high temperature (663 ℃) is greatly shortened, the total heat treatment time is shortened by 57 hours, the time consumption is reduced by 38.8%, and the critical current value of the wire is improved by 20A.
Example 2
Step 1, strictly following the winding process of a critical current sample of a superconducting wire, and winding Nb with the specification of phi 0.990mm 3 The Sn wire is wound on a superconducting wire critical current sample framework and is placed in a vacuum heat treatment furnace;
step 2, placing the vacuum heat treatment furnace in the center of the liquid-free helium magnet, and starting a refrigerating system of the liquid-free helium magnet until the ambient temperature of a magnet coil is reduced to 4.20-4.26K;
step 3, for Nb 3 The Sn wire 4 is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet 1 to the heat-treated Nb 3 The Sn wire 4 provides a background magnetic field; the heat treatment specifically includes: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage. The temperature of the low-temperature heat treatment stage is 210 ℃, the treatment time is 32h, and the background magnetic field intensity is 10T; the temperature of the medium-temperature heat treatment stage is 400 ℃, the treatment time is 32h, and the background magnetic field intensity is 10.5T; the temperature of the high-temperature heat treatment stage is 665 ℃, the treatment time is 32h, and the background magnetic field intensity is 11.5T;
step 4, testing the critical current value of the sample heat-treated in the step 3 under the condition of 4.2K/12T, and testing the Nb heat-treated in the step S3 3 The critical current value of the Sn wire 1, and the test result was compared with the critical current value of a sample that was heat-treated according to a standard protocol without applying a strong magnetic field. The three heat treatment stages without strong magnetic field include a low temperature heat treatment stage,A medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage is 210 ℃, and the treatment time is 49 hours; the temperature of the medium temperature heat treatment stage is 400 ℃, and the treatment time is 49h; the temperature of the high-temperature heat treatment stage is 665 ℃, and the treatment time is 50h. And the test results were compared with the critical current values of the samples heat-treated according to the standard protocol without applying the background magnetic field, and the test results are shown in table 2:
TABLE 2
Figure BDA0003671317430000071
By mixing Nb of phi 0.990mm 3 The Sn superconducting wire is placed in a strong magnetic field for heat treatment, the heat preservation time of the Sn superconducting wire in three stages of low temperature (210 ℃), medium temperature (400 ℃) and high temperature (665 ℃) is greatly shortened, the total heat treatment time is shortened by 52 hours, the time consumption reduction is 35.1%, and the critical current value of the wire is increased by about 25A.
Example 3
Step 1, strictly following the winding process of a critical current sample of a superconducting wire, and winding Nb with the specification of phi 1.300mm 3 The Sn wire is wound on a superconducting wire critical current sample framework and is placed in a vacuum heat treatment furnace;
step 2, placing the vacuum heat treatment furnace in the center of the liquid-free helium magnet, and starting a refrigeration system of the liquid-free helium magnet until the ambient temperature of a magnet coil is reduced to 4.20K-4.26K;
step 3, for Nb 3 The Sn wire 4 is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet 1 to the heat-treated Nb 3 The Sn wire 4 provides a background magnetic field; the heat treatment specifically includes: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage. The temperature of the low-temperature heat treatment stage is 215 ℃, the treatment time is 35 hours, and the background magnetic field intensity is 10.5T; the temperature of the medium-temperature heat treatment stage is 403 ℃, the treatment time is 35 hours, and the background magnetic field intensity is 11T; the temperature of the high-temperature heat treatment stage is 668 ℃, the treatment time is 35 hours, and the background magnetic field intensity is 12T;
step 4, testing under the condition of 4.2K/12TCritical current value of the sample heat-treated in step 3, nb heat-treated in step S3 was tested 3 The critical current value of the Sn wire 1 was measured, and the measurement result was compared with the critical current value of a sample which was heat-treated according to a standard protocol without applying a strong magnetic field. The three heat treatment stages without applying the strong magnetic field comprise a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage is 215 ℃, and the treatment time is 48 hours; the temperature of the medium temperature heat treatment stage is 403 ℃, and the treatment time is 48h; the temperature of the high-temperature heat treatment stage is 668 ℃, and the treatment time is 49h. And the test results were compared with the critical current values of the samples heat-treated according to the standard protocol without applying the background magnetic field, and the test results are shown in table 3:
TABLE 3
Figure BDA0003671317430000091
By mixing Nb of 1.300mm 3 The Sn superconducting wire is placed in a strong magnetic field for heat treatment, the heat preservation time of the low-temperature (210 ℃), the medium-temperature (400 ℃) and the high-temperature (665 ℃) stages is greatly shortened, the total heat treatment time is shortened by 41 hours, the consumed time is shortened by 28.1%, and the critical current value of the wire is increased by about 50A.
Multiple experimental results prove that the Nb is 3 Sn wires are placed in a strong background magnetic field for heat treatment, so that the diffusion of Sn, cu and Nb elements can be accelerated, and Nb can be obviously shortened 3 Heat treatment period of Sn wire rod to refine Nb 3 Sn crystal grains, and the critical current value of the wire is improved.
Researches show that when the composite metal wire is placed in a strong magnetic field for heat treatment, metal atoms can acquire energy from the magnetic field without contact, the diffusion activation energy of the metal atoms is improved, and the diffusion coefficient is obviously increased. Therefore, the heat treatment of the metal diffusion couple in a strong magnetic field is one of the effective methods for accelerating the diffusion of metal atoms. Thus, in Nb 3 In the vacuum heat treatment process of the Sn superconducting wire, a background magnetic field with certain strength is applied to the wire in different heat treatment stages so as to obviously accelerate element diffusion in the wire and shorten the time of heat treatmentSimultaneously improve the synchronous reaction degree of Nb and Sn elements in the wire rod, and realize the shortening of Nb 3 Realizing Nb at the same time of Sn wire heat treatment period 3 Sn crystal grains are refined, and the critical current value of the wire rod is improved.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It will be understood that the invention is not limited to what has been described above and that various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (4)

1. Nb for acceleration 3 The method for diffusing and refining the Sn wire rod element is characterized by comprising the following steps:
s1, adding Nb 3 The Sn wire (4) is wound on the superconducting wire critical current sample framework (3) and is placed in the vacuum heat treatment furnace (2);
s2, placing the vacuum heat treatment furnace (2) in the center of the liquid-free helium magnet (1), and starting a refrigerating system of the liquid-free helium magnet (1) until the environmental temperature of a magnet coil is reduced to 4.20K to 4.26K;
s3, pair Nb 3 The Sn wire (4) is heat-treated while adjusting the magnetic field strength of the liquid helium-free magnet (1) to the heat-treated Nb 3 The Sn wire (4) provides a background magnetic field;
the heat treatment specifically comprises: a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage is 205 to 215 ℃, and the processing time is 30h to 35h; the temperature in the medium temperature heat treatment stage is 397 to 403 ℃, and the treatment time is 30h to 35h; the temperature of the high-temperature heat treatment stage is 663 to 668 ℃, the treatment time is 30h to 35h, and the background magnetic field strength of the low-temperature heat treatment stage is 10T to 10.5T; the background magnetic field intensity in the medium-temperature heat treatment stage is 10.5T to 11T; the magnetic field intensity in the high-temperature heat treatment stage is 11T to 12T.
2. An accelerated Nb as in claim 1 3 The method for diffusing Sn wire rod elements and refining grains is characterized in that Nb is adopted in the step S1 3 The diameter of the Sn wire (4) is phi 0.820 mm-1.300 mm.
3. An accelerated Nb as in claim 1 3 The method for diffusing and refining the Sn wire rod element is characterized by further comprising the following steps: testing of Nb Heat treated in step S3 3 The critical current value of the Sn wire (1) is compared with that of a sample which is not applied with a strong magnetic field and is subjected to heat treatment according to a standard system.
4. The method for accelerating the diffusion of the elements and refining the grains of the Nb3Sn wire according to claim 1, wherein the three heat treatment stages without applying a strong magnetic field comprise a low-temperature heat treatment stage, a medium-temperature heat treatment stage and a high-temperature heat treatment stage, wherein the temperature of the low-temperature heat treatment stage ranges from 205 ℃ to 215 ℃, and the treatment time ranges from 48h to 49h; the temperature of the medium temperature heat treatment stage is 397 to 403 ℃, and the treatment time is 48h to 49h; the temperature of the high-temperature heat treatment stage is 663 to 668 ℃, and the treatment time is 49h to 51h.
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CN116334375B (en) * 2023-05-30 2023-08-11 西安聚能超导线材科技有限公司 Niobium three-tin superconducting wire heat treatment method, preparation method and niobium three-tin superconducting wire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1683281A (en) * 2004-04-14 2005-10-19 中国科学院电工研究所 Process for preparing magnesium diboride superconductor
CN102254621A (en) * 2011-04-07 2011-11-23 西部超导材料科技有限公司 Thermal treatment method for internal-tin method Nb3Sn superconducting wire
CN102723162A (en) * 2012-07-09 2012-10-10 中国科学院电工研究所 Coil for stainless steel framed Nb3Sn superconducting solenoid
WO2013187268A1 (en) * 2012-06-11 2013-12-19 株式会社 日立製作所 MgB2-SUPERCONDUCTING WIRE AND METHOD FOR PRODUCING SAME
CN111540598A (en) * 2020-05-08 2020-08-14 中国科学院合肥物质科学研究院 Large-aperture high-field magnet Nb3Sn close-wound coil heat treatment device
CN112921167A (en) * 2021-01-25 2021-06-08 西安聚能超导磁体科技有限公司 High-intensity magnetic field heat treatment equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1683281A (en) * 2004-04-14 2005-10-19 中国科学院电工研究所 Process for preparing magnesium diboride superconductor
CN102254621A (en) * 2011-04-07 2011-11-23 西部超导材料科技有限公司 Thermal treatment method for internal-tin method Nb3Sn superconducting wire
WO2013187268A1 (en) * 2012-06-11 2013-12-19 株式会社 日立製作所 MgB2-SUPERCONDUCTING WIRE AND METHOD FOR PRODUCING SAME
CN102723162A (en) * 2012-07-09 2012-10-10 中国科学院电工研究所 Coil for stainless steel framed Nb3Sn superconducting solenoid
CN111540598A (en) * 2020-05-08 2020-08-14 中国科学院合肥物质科学研究院 Large-aperture high-field magnet Nb3Sn close-wound coil heat treatment device
CN112921167A (en) * 2021-01-25 2021-06-08 西安聚能超导磁体科技有限公司 High-intensity magnetic field heat treatment equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"大型Nb_3Sn_CICC型超导线圈的热处理工艺_";钱新星等;《超导技术》;20181231;第46卷(第2期);第25-28、38页 *

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