CN112489884A - Iron-based superconducting composite wire and preparation method thereof - Google Patents

Iron-based superconducting composite wire and preparation method thereof Download PDF

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CN112489884A
CN112489884A CN202011317360.6A CN202011317360A CN112489884A CN 112489884 A CN112489884 A CN 112489884A CN 202011317360 A CN202011317360 A CN 202011317360A CN 112489884 A CN112489884 A CN 112489884A
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iron
based superconducting
wire
core
composite
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CN112489884B (en
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董持衡
刘世法
马衍伟
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • 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 provides an iron-based superconducting composite wire and a preparation method thereof, relating to the technical field of iron-based superconducting materials. The preparation method provided by the invention comprises the following steps: putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is more than or equal to 1, and m is more than or equal to 0; and sequentially performing hole pattern rolling and heat treatment on the final-stage composite body to obtain the iron-based superconducting composite wire. The preparation method provided by the invention can not only improve the density of the iron-based superconducting composite wire, but also form stronger texture, thereby improving the current carrying capacity of the wire. The method is simple and easy to operate, has low preparation cost and is suitable for industrial popularization and application.

Description

Iron-based superconducting composite wire and preparation method thereof
Technical Field
The invention relates to the technical field of iron-based superconducting materials, in particular to an iron-based superconducting composite wire and a preparation method thereof.
Background
The iron-based superconducting material is a novel high-temperature superconducting material which is discovered after 2008 and has a crystal structure containing a FeAs layer or a FeSe layer, and has the advantages of high upper critical field, high critical current density, low anisotropy and the like. The iron-based superconducting wire and strip prepared by a powder tube filling method (PIT) is low in cost, has good high-field current carrying capacity, and is expected to be applied to next-generation high-energy accelerators, high-field magnets and nuclear magnetic resonance imaging systems. An iron-based superconducting wire strip includes an outer metal sheath and an inner superconducting core, which are responsible for carrying superconducting current, as shown in fig. 1 (a). The superconducting core filaments can be classified into single core filament tapes having only one core filament and multi-core filament tapes having a plurality of core filaments according to the number of the superconducting core filaments. The iron-based superconducting wire strip can be further divided into a strip and a wire according to the shape of the iron-based superconducting wire strip. The cross section of the strip is flat, and the length-width ratio is up to 10-20; the cross-section of the wire is close to circular with an aspect ratio close to 1. At present, the preparation technology of the iron-based superconducting tape has made a breakthrough, a hectometer-level iron-based superconducting tape is prepared internationally and is wound into a cake-shaped coil and a runway-shaped coil, so that the iron-based superconducting tape still has good performance in a high field and marks the forward practical stage of the iron-based superconducting material. However, the strip material, due to its particular profile, has limited application in certain areas. Compared with the prior art, the wire can be wound into a solenoid coil, and practical application is facilitated. At present, the wire rod preparation process level is low, the wire rod depends on expensive hot isostatic pressing equipment, texture is difficult to introduce into the wire rod, the performance of the wire rod is far lower than that of a strip material, and the practical application of the wire rod is severely restricted. A large number of researches show that the current carrying capacity of the iron-based superconducting wire is closely related to the density and the texture degree of the superconducting core. Vickers hardness is widely used internationally to evaluate the density of superconducting cores. The higher the vickers hardness, the higher the density. The density of the superconducting core is improved, so that holes and cracks can be reduced, and the effective current transmission area is increased. A superconducting core of the wire rod prepared by the traditional cold machining processes of rotary forging, drawing and the like has a large number of holes and cracks, the Vickers hardness is only 50-80, and the current carrying capacity of the wire rod is severely limited. At present, the wire can only be subjected to heat treatment by hot isostatic pressing equipment, so that the density of the superconducting core of the wire is improved, and the Vickers hardness reaches 200 HV. However, the hot isostatic pressing equipment is expensive, the sintering cost is high, the preparation cost of the wire rod is increased, the technical requirements are strict, and the yield is low. Secondly, there is a weak connection effect in the iron-based superconducting wire, and when the grain boundary angle is greater than 9 degrees, the intercrystalline current drops sharply. Therefore, the introduction of texture in the superconducting core is advantageous for increasing the intercrystalline current. At present, the iron-based superconducting wire preparation process cannot form texture in a superconducting core, and further improvement of current is restricted. In conclusion, how to improve the density and the texture degree of the iron-based superconducting wire by a conventional low-cost method is a difficult problem in the practical process of the iron-based superconducting wire at present.
The iron-based superconducting wire is generally prepared by rotary swaging and drawing in the processing process. After the wire is annealed at normal pressure, the texture degree and the density of the superconducting core are very low, so that the current carrying capacity is weak. Therefore, Hot Isostatic Pressing (HIP) is required to perform subsequent annealing treatment on the wire rod, so that the environmental pressure during annealing is increased, an isotropic pressure (the pressure generally reaches 200MPa) is provided for the wire rod, and the density of the superconducting core is increased. However, the HIP technique relies on expensive, precise hot isostatic pressing furnaces, which makes it difficult to reduce manufacturing costs. Moreover, the HIP process cannot introduce a high degree of texture into the wire, which makes it difficult to further increase the critical current density. Therefore, after the wire rod is prepared by swaging and drawing, the wire rod needs to be processed into a strip material by flat roll rolling, and a strong c-axis texture is introduced, so that high critical current density is realized. However, the application area of the strip is narrow, so that a cake-shaped coil can be prepared, but a solenoid coil is difficult to wind. The cross section of the wire is weak in anisotropy, has unique advantages in superconducting magnet winding, and is an ideal conductor for strong current application. Therefore, a conventional processing mode which does not depend on precise and expensive hot isostatic pressing equipment needs to be developed, the density and the texture degree of the iron-based superconducting wire are improved, the potential of large-scale production is realized, and the high-performance and low-cost hectometer or even kilometer superconducting wire is prepared.
Disclosure of Invention
The invention aims to provide an iron-based superconducting composite wire and a preparation method thereof, the preparation method provided by the invention is simple and easy to operate, the preparation cost is low, the density of the iron-based superconducting composite wire can be improved, and a stronger texture can be formed, so that the current carrying capacity of the wire is improved, and the preparation method is suitable for industrial popularization and application.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of an iron-based superconducting composite wire, which comprises the following steps:
putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is more than or equal to 1, and m is more than or equal to 0;
and sequentially performing hole pattern rolling and heat treatment on the final-stage composite body to obtain the iron-based superconducting composite wire.
Preferably, before the n iron-based superconducting single-core wires and the m metal rods are packed into the outer layer sheath tube, the method further comprises the following steps: firstly, putting n iron-based superconducting single-core wires and m metal rods into a tundish sleeve for assembly to obtain a primary complex; the primary composite is then encased in an outer sheath to produce a final composite.
Preferably, the sheath material of the iron-based superconducting single-core wire is silver or silver alloy.
Preferably, the metal bar is made of nickel, nickel alloy, copper alloy, silver alloy, hastelloy or stainless steel.
Preferably, the material of the outer sheath tube is one of titanium, aluminum, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, niobium, molybdenum, cadmium, hafnium, tantalum, tungsten and lead, or any one of the above metal alloys.
Preferably, the material of the outer layer sheath tube is stainless steel, monel, copper, tantalum, iron or hastelloy.
Preferably, when n is greater than 1 and m is 1, the iron-based superconducting single-core wire and the metal bar are assembled in a way that: and arranging the metal bar at the centers of the iron-based superconducting single-core wires, wherein the iron-based superconducting single-core wires surround the metal bar along the circumferential direction.
Preferably, the pass of the pass rolling is a c-edge shape, wherein c is more than or equal to 3.
Preferably, the temperature of the heat treatment is 500-1400 ℃, the heat treatment is carried out under the inert atmosphere or vacuum condition, and the pressure is 10-5～105Pa。
The invention provides the iron-based superconducting composite wire prepared by the preparation method in the technical scheme.
The invention provides a preparation method of an iron-based superconducting composite wire, which comprises the following steps: putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is more than or equal to 1, and m is more than or equal to 0; and sequentially performing hole pattern rolling and heat treatment on the final-stage composite body to obtain the iron-based superconducting composite wire. The final cold processing means adopted by the invention is pass rolling, and isotropic high compression force is provided in the processing deformation process; the outer layer casing pipe is strongly contracted towards the center under the effect of pass rolling to provide huge compression stress for the superconducting core at the center, so that the density of the superconducting core is greatly improved, and extension stress along the axial direction of the wire rod is provided, so that the sheet superconducting grains lie down along the wire rod core to form a local c-axis texture; according to the invention, the metal bar is added into the iron-based superconducting composite wire, in the pass rolling process, the inner metal bar is matched with the outer layer sleeve pipe, and the iron-based superconducting single-core wire is extruded to form local axial pressure, so that not only is the density of the superconducting core improved, but also a strong c-axis texture is formed under the axial pressure, and thus the current carrying capacity of the wire is improved. Tests prove that the Vickers hardness of the superconducting core in the iron-based superconducting composite wire prepared by the invention is as high as 400HV, the compactness is as high as 100 percent, and the critical current density under 4.2K and 10T is 1.1 multiplied by 104～1.2×105A/cm2. The preparation method provided by the invention can not only improve the density of the iron-based superconducting composite wire, but also form a stronger c-axis texture, thereby improving the current carrying capacity of the wire. Moreover, compared with the conventional processing mode which depends on precise and expensive hot isostatic pressing equipment, the method is simple and easy to operate, has lower preparation cost and is suitable for industrialized popularization and application.
Drawings
Fig. 1 is a sectional view of an iron-based superconducting single core composite wire prepared in example 1, a sectional view of a seven core iron-based superconducting composite wire prepared in example 2, and schematic views of final composites of examples 3 and 4;
FIG. 2 is a graph showing the change of critical current density at 4.2K with respect to a magnetic field of the seven-core Fe-based superconducting composite wire prepared in example 2;
fig. 3 is a graph showing vickers hardness distribution of superconducting cores in the seven-core iron-based superconducting composite wire rod prepared in example 2.
Detailed Description
The invention provides a preparation method of an iron-based superconducting composite wire, which comprises the following steps:
putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is more than or equal to 1, and m is more than or equal to 0;
and sequentially performing hole pattern rolling and heat treatment on the final-stage composite body to obtain the iron-based superconducting composite wire.
The method comprises the steps of putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is greater than or equal to 1, preferably 1 to 18, and further preferably 4 to 7, and in a specific embodiment of the invention, n is particularly preferably 1, 4, 6, 7 or 18; m.gtoreq.0, preferably 1, 3, 4, 6, 8 or 10.
The preparation method of the iron-based superconducting single-core wire has no special requirements, and the preparation method which is well known by the technical personnel in the field can be adopted. In the present invention, the jacket material of the iron-based superconducting single core wire is preferably silver or a silver alloy, and more preferably silver, a silver-tin alloy, a silver-manganese alloy, or a silver-magnesium alloy. In the invention, the silver and the silver alloy have good processing performance and can prevent the reaction with the superconducting core of the iron-based superconducting wire. In the invention, the material of the iron-based superconductor precursor powder in the iron-based superconducting single-core wire is preferably Ba1-xKxFe2As2, Sr1-xKxFe2As2, BaFe2-xCoxAs2, SmFeAsO1-xFx or CaKFe4As 4.
In the present invention, the cross-sectional shape of the iron-based superconducting single-core wire is preferably a regular hexagon, a square, or a circle. The iron-based superconducting single-core wire rod has no special requirements on the size, and can be manufactured according to actual requirements.
In the present invention, when the number n of the iron-based superconducting single-core wires is greater than 1, it is preferable that one iron-based superconducting single-core wire is prepared first, and then the iron-based superconducting single-core wire is divided into a plurality of sections to obtain a plurality of iron-based superconducting single-core wires.
In the present invention, the material of the metal bar is preferably nickel, nickel alloy, copper alloy, silver alloy, hastelloy or stainless steel. According to the invention, the metal bar is added into the iron-based superconducting composite wire, in the pass rolling process, the inner metal bar is matched with the outer layer sleeve pipe, and the iron-based superconducting single-core wire is extruded to form local axial pressure, so that not only is the density of the superconducting core improved, but also a strong c-axis texture is formed under the axial pressure, and thus the current carrying capacity of the wire is improved.
In the present invention, the cross-sectional shape of the metal bar is preferably a regular hexagon, a square or a circle; the invention has no special requirements on the size of the metal bar and can be manufactured according to actual requirements. In the present invention, the shape and size of the metal bar preferably correspond to those of the iron-based superconducting single-core wire.
In the present invention, when n >1 and m is 1, the iron-based superconducting single core wire and the metal rod are preferably assembled in a manner that: and arranging the metal bar at the centers of the iron-based superconducting single-core wires, wherein the iron-based superconducting single-core wires surround the metal bar along the circumferential direction. In a specific embodiment of the invention, the iron-based superconducting single-core wires are uniformly distributed on the surface of the metal bar. In the invention, when n is more than 1 and m is more than 1, the metal bars are uniformly distributed among the iron-based superconducting single-core wires.
In the present invention, the material of the outer sheath tube is preferably one of titanium, aluminum, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, niobium, molybdenum, cadmium, hafnium, tantalum, tungsten, and lead, or an alloy of any of the above metals, and more preferably stainless steel, monel, copper, tantalum, iron, or hastelloy. According to the invention, the material with higher mechanical strength is used as the outer layer sleeve pipe, high pressure is applied to the superconducting core during cold processing, and work hardening is not easy to disappear, so that the superconducting core is still under the action of high-pressure stress during heat treatment, and the density of the superconducting core is improved.
In the invention, the thickness of the outer layer sleeve is preferably 0.3-2 mm, and more preferably 0.5-1 mm. In the present invention, the cross-sectional shape of the outer sheath tube is preferably a regular hexagon, a square or a circle. In the present invention, the cross-sectional shape of the outer sheath tube is preferably in conformity with the cross-sectional shapes of the iron-based superconducting single-core wire and the metal rod.
Before n iron-based superconducting single-core wires and m metal rods are arranged in an outer layer sleeve, the invention preferably further comprises the following steps: firstly, putting n iron-based superconducting single-core wires and m metal rods into a tundish sleeve for assembly to obtain a primary complex; the primary composite is then encased in an outer sheath to produce a final composite. The iron-based superconducting single-core wire and the metal bar are firstly put into the tundish sleeve and then processed to obtain a primary complex, and then the iron-based superconducting single-core wire and the metal bar are put into the outer layer tundish sleeve, so that the size and the structure of a conductor of the primary complex can be effectively controlled through the first assembling and processing, and the density and the texture degree can be improved through the second assembling and the pass rolling.
In the present invention, the material of the tundish sleeve is preferably silver-tin alloy, silver-magnesium alloy or copper. In the invention, the thickness of the tundish sleeve is preferably 0.3-3 mm, and more preferably 0.5-2 mm.
In the present invention, the assembling manner of the n iron-based superconducting single-core wires and the m metal rods in the tundish sleeve is preferably the same as the assembling manner of the n iron-based superconducting single-core wires and the m metal rods in the outer-layer sleeve, and is not described herein again.
After the final-stage composite body is obtained, the final-stage composite body is subjected to hole-pattern rolling and heat treatment in sequence to obtain the iron-based superconducting composite wire. In the invention, the pass of the pass rolling is preferably c-edge shape, wherein c is more than or equal to 3. In a specific embodiment of the invention, the pass rolled by the pass rolling is a regular triangle, a square, a regular hexagon or a regular octagon. In the invention, when the pass rolled by the pass is square, the magnet is wound by using the wire rod prepared by the pass, and the wire rod is not easy to slide due to the action of Lorentz force and the like; when the pass rolled by the pass is a regular hexagon or a regular octagon, the cross section of the rolled wire rod can be closer to a circle, and the magnet can be wound more easily.
In the invention, the temperature of the pass rolling is preferably 20-900 ℃, and more preferably 30-400 ℃; the pass rolling is preferably multi-pass processing, the pass processing is preferably 3-12 passes, and more preferably 6-10 passes; the processing rate per pass is preferably 5 to 40%, more preferably 10 to 20%, and further preferably 15%.
The final cold working means of the final composite body is pass rolling. At present, the final cold processing means for forming the iron-based superconducting wire strip is generally drawing or flat roll rolling, isotropic shrinkage force towards the center is applied to the wire by drawing, but the shrinkage force is small, so that the density of the superconducting core of the wire subjected to final heat treatment is low, and the Vickers hardness is less than 100 HV; the flat rolling only provides axial pressure, and although the compactness and the texture degree can be improved, the wire is finally processed into a strip material, and the aim of preparing the wire cannot be achieved. The final cold processing means adopted by the invention is pass rolling, and a larger isotropic compression force is provided in the processing deformation process; in addition, the outer layer sleeve is made of metal with high mechanical strength, and the outer layer sleeve is strongly contracted towards the center under the effect of pass rolling to provide great compression stress for the superconducting core at the center, so that the density of the superconducting core is greatly improved.
In the invention, the temperature of the heat treatment is preferably 500-1400 ℃, more preferably 600-1000 ℃, and further preferably 650-850 ℃. In the present invention, the heat treatment time is preferably 0.1 to 24 hours, more preferably 0.5 to 18 hours, and further preferably 6 to 12 hours. In the present invention, the heat treatment is preferably performed under an inert atmosphere or vacuum, and particularly preferably an argon atmosphere, a nitrogen atmosphere, or vacuum; the pressure of the system during the heat treatment is preferably 10-5～105Pa, when the heat treatment is carried out in an inert atmosphere, the pressure is preferably 103～105Pa, and when the heat treatment is performed under vacuum conditions, the pressure is preferably 10-5～10-2Pa. In the present invention, the heat treatment serves to promote grain growth and increase connectivity between grains.
The invention also provides the iron-based superconducting composite wire prepared by the preparation method in the technical scheme. In the invention, the iron-based superconducting composite wire comprises an outer layer sheath pipe, and n iron-based superconducting single-core wires and m metal rods which are arranged in the outer layer sheath pipe. In the present invention, the cross-sectional shape of the iron-based superconducting composite wire is preferably a regular triangle, a square, a regular hexagon, or a regular octagon. In the present invention, the arrangement of the n iron-based superconducting single-core wires and the m metal rods inside the outer sheath is preferably: when m is 1, the metal bar is arranged at the center of the iron-based superconducting single-core wire rods, the iron-based superconducting single-core wire rods surround the metal bar in the circumferential direction, and when m is greater than 1, the m metal bar rods are uniformly distributed in the iron-based superconducting single-core wire rods.
In the present invention, the iron-based superconducting composite wire preferably further includes a tundish sleeve, and specifically, the iron-based superconducting composite wire preferably includes: the iron-based superconducting composite wire comprises an outer-layer sheath pipe, a middle sheath pipe arranged in the outer-layer sheath pipe, n iron-based superconducting single-core wires and m metal rods arranged in the middle sheath pipe.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing a silver-coated iron-based superconducting single-core wire;
inserting the silver-coated iron-based superconducting single-core wire into a stainless steel pipe to form a final composite;
processing the final-stage composite body by pass rolling, wherein the pass of the pass rolling is hexagonal, the processing passes are 12 passes, and the processing rate of each pass is 5%;
placing the hole-rolled composite wire in a vacuum furnace with the vacuum degree of 10-5Pa, heating to 500 ℃, and preserving heat for 24 hours to obtain the iron-based superconducting single-core composite wire.
A cross-sectional view of the iron-based superconducting single core composite wire rod prepared in this example is shown in fig. 1 (a). Through tests, the Vickers hardness of the superconducting core in the iron-based superconducting single-core composite wire is 280HV, and the critical current density under 4.2K and 10T is 2.1 multiplied by 104A/cm2。
Example 2
Preparing a silver-coated iron-based superconducting single-core wire;
dividing the silver-sheathed iron-based superconducting single-core wire into 7 sections, and then plugging 7 silver-sheathed iron-based superconducting single-core wires into a silver-tin alloy sheathed tube to process the silver-sheathed iron-based superconducting single-core wires into a primary complex;
plugging the primary composite body into a Hastelloy tube to form a final composite body;
processing the final-pole composite body into a composite wire rod through pass rolling, wherein the pass of the pass rolling is a regular octagon, the processing pass is 10 passes, and the pass processing rate is 10%;
carrying out high-temperature heat treatment on the hole-rolled composite wire under the atmosphere of argon and the pressure of 103Pa, the heat treatment temperature is 700 ℃, and the temperature is kept for 12 hours to obtain the seven-core iron-based superconducting composite wire.
The cross-sectional view of the seven-core iron-based superconducting composite wire prepared in this example is shown in fig. 1 (b), the vickers hardness of the superconducting core is as high as 400HV, the compactness is 100% as shown in fig. 3, the critical current density at 4.2K varies with the magnetic field as shown in fig. 2, and the critical current density at 10T is 1.9 × 104A/cm2。
Example 3
Preparing a silver-tin alloy sheathed iron-based superconducting single-core wire, and enabling the cross section of the wire to be in a regular hexagon shape;
dividing the iron-based superconducting single-core wire into 6 sections, inserting 6 iron-based superconducting single-core wires and 1 Monel alloy rod with a regular hexagonal cross section into a Monel alloy sheath pipe with a hexagonal cross section, wherein the Monel alloy rod is arranged at the center of the 6 iron-based superconducting single-core wires, and the 6 iron-based superconducting single-core wires surround the Monel alloy rod along the circumferential direction to form a final composite body, wherein the schematic diagram of the final composite body is shown in (c) in FIG. 1;
processing the final-pole composite body into a composite wire rod through pass rolling, wherein the pass of the pass rolling is a regular hexagon, the processing pass is 8 passes, and the pass processing rate is 15%;
carrying out high-temperature heat treatment on the hole-rolled composite wire, wherein the heat treatment atmosphere is argon, and the pressure is 104Pa, the heat treatment temperature is 850 ℃, and the temperature is kept for 0.5 hour to obtain the six-core iron-based superconducting composite wire.
In the six-core iron-based superconducting composite wire prepared in the embodiment, because the Monel alloy bar with high mechanical strength is added in the center, in the pass rolling process, the Monel alloy bar and the outer layer sleeve pipe perform local axial extrusion on the silver-tin alloy sheath and the superconducting core, and meanwhile, the texture degree and the density are improved, so that the critical current density is greatly improved, and the critical current density of the six-core iron-based superconducting composite wire under 4.2K and 10T reaches 1.2 multiplied by 105A/cm2(ii) a The Vickers hardness is 350 HV.
Example 4
Preparing a silver-manganese alloy sheathed iron-based superconducting single-core wire, and enabling the cross section of the wire to be square;
dividing the iron-based superconducting single-core wire into 4 sections, and then plugging 4 iron-based superconducting single-core wires and 1 copper rod with a square cross section into an iron clad square tube, wherein the copper rod is arranged at the center of the 4 iron-based superconducting single-core wires to form a final composite body, and the schematic diagram of the final composite body is shown in (d) in fig. 1;
processing the final-stage composite body into a composite wire rod through pass rolling, wherein the pass of the pass rolling is square, the processing pass is 6 passes, and the pass processing rate is 20%;
carrying out high-temperature heat treatment on the hole-rolled composite wire, wherein the heat treatment atmosphere is vacuum and the pressure is 10-3Pa, the heat treatment temperature is 650 ℃,and preserving the heat for 6 hours to obtain the four-core iron-based superconducting composite wire.
The four-core iron-based superconducting composite wire prepared in the embodiment shrinks towards the center by the external square iron sheath in the pass rolling process, and performs local axial extrusion on the superconducting core together with the central square copper rod, so that a texture is formed in the superconducting core. Tests show that the Vickers hardness of the superconducting core of the four-core iron-based superconducting composite wire reaches 280HV, and the critical current density reaches 1 multiplied by 10 under 4.2K and 10T5A/cm2。
Example 5
Preparing a silver-magnesium alloy sheathed iron-based superconducting single-core wire;
dividing the iron-based superconducting single-core wire into 18 sections, and then plugging 18 iron-based superconducting single-core wires and a copper rod into a silver-magnesium alloy clad sleeve to process the iron-based superconducting single-core wires and the copper rod into a primary complex, wherein the copper rod is arranged in the center of the 18 iron-based superconducting single-core wires;
the primary composite body is plugged into a copper pipe to form a final composite body;
processing the final-stage composite body into a composite wire rod through pass rolling, wherein the pass of the pass rolling is rectangular, the processing pass is 5 passes, and the pass processing rate is 30%;
carrying out high-temperature heat treatment on the hole-rolled composite wire rod, wherein the heat treatment atmosphere is vacuum and the pressure is 10-2Pa, the heat treatment temperature is 600 ℃, and the temperature is kept for 18 hours to obtain the 18-core iron-based superconducting composite wire.
The cross section of the 18-core iron-based superconducting composite wire prepared by the embodiment is rectangular, so that gaps among the wires can be effectively reduced when the magnet is wound, and meanwhile, the wires are effectively prevented from being twisted when being wound. The critical current density of the superconducting core of the wire reaches 5 multiplied by 10 under 4.2K and 10T4A/cm2(ii) a The Vickers hardness is 300 HV.
Example 6
Preparing a silver-tin alloy sheathed iron-based superconducting single-core wire;
inserting the iron-based superconducting single-core wire into a tantalum tube to form an ultimate complex;
processing the final composite body by pass rolling, wherein the pass of the pass rolling is a regular triangle, the processing passes are 3, and the processing rate of each pass is 40%;
carrying out high-temperature heat treatment on the hole-rolled composite wire rod in nitrogen at the pressure of 105Pa, the temperature of heat treatment is 1000 ℃, and the temperature is kept for 0.1 hour to obtain the iron-based superconducting single-core composite wire.
Tests prove that the Vickers hardness of the superconducting core of the iron-based superconducting single-core composite wire rod prepared in the embodiment is 200HV, and the critical current density reaches 1.1 multiplied by 10 under 4.2K and 10T4A/cm2。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A preparation method of an iron-based superconducting composite wire is characterized by comprising the following steps:
putting n iron-based superconducting single-core wires and m metal rods into an outer-layer sheath tube for assembly to obtain a final-level complex; wherein n is more than or equal to 1, and m is more than or equal to 0;
and sequentially performing hole pattern rolling and heat treatment on the final-stage composite body to obtain the iron-based superconducting composite wire.
2. The method according to claim 1, wherein before the step of placing the n iron-based superconducting single-core wires and the m metal rods in the outer sheath tube, the method further comprises: firstly, putting n iron-based superconducting single-core wires and m metal rods into a tundish sleeve for assembly to obtain a primary complex; the primary composite is then encased in an outer sheath to produce a final composite.
3. The method according to claim 1 or 2, wherein the sheath material of the iron-based superconducting single-core wire is silver or silver alloy.
4. The method according to claim 1 or 2, wherein the metal bar is made of nickel, nickel alloy, copper alloy, silver alloy, hastelloy or stainless steel.
5. The preparation method according to claim 1 or 2, characterized in that the material of the outer layer sheath tube is one of titanium, aluminum, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, niobium, molybdenum, cadmium, hafnium, tantalum, tungsten and lead, or any one of the alloys of the above metals.
6. The method according to claim 5, wherein the outer sheath tube is made of stainless steel, monel, copper, tantalum, iron, or hastelloy.
7. The method according to claim 1 or 2, wherein when n is greater than 1 and m is 1, the iron-based superconducting single-core wire and the metal bar are assembled in a manner that: and arranging the metal bar at the centers of the iron-based superconducting single-core wires, wherein the iron-based superconducting single-core wires surround the metal bar along the circumferential direction.
8. The production method according to claim 1 or 2, wherein the pass rolled by pass rolling is a c-edge shape, wherein c ≧ 3.
9. The method according to claim 1 or 2, wherein the heat treatment is performed at a temperature of 500 to 1400 ℃ under an inert atmosphere or vacuum at a pressure of 10-5～105Pa。
10. An iron-based superconducting composite wire produced by the production method according to any one of claims 1 to 9.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003331660A (en) * 2002-05-08 2003-11-21 Hitachi Ltd Metal-sheathed superconductor wire, superconducting coil, and its manufacturing method
CN101859612A (en) * 2010-05-24 2010-10-13 西部超导材料科技有限公司 Preparation method of CuNb composite pipe for high-field Nb3Sn wire material
CN105869781A (en) * 2016-06-29 2016-08-17 西北有色金属研究院 Preparation method of FeSe-based superconduction wire
CN106601366A (en) * 2016-12-14 2017-04-26 中国科学院电工研究所 Manufacturing method of 122 type iron-based compound superconducting wire or belt material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003331660A (en) * 2002-05-08 2003-11-21 Hitachi Ltd Metal-sheathed superconductor wire, superconducting coil, and its manufacturing method
CN101859612A (en) * 2010-05-24 2010-10-13 西部超导材料科技有限公司 Preparation method of CuNb composite pipe for high-field Nb3Sn wire material
CN105869781A (en) * 2016-06-29 2016-08-17 西北有色金属研究院 Preparation method of FeSe-based superconduction wire
CN106601366A (en) * 2016-12-14 2017-04-26 中国科学院电工研究所 Manufacturing method of 122 type iron-based compound superconducting wire or belt material

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