CN114360807A - Iron-based superconducting multi-core wire and preparation method and application thereof - Google Patents
Iron-based superconducting multi-core wire and preparation method and application thereof Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 396
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 197
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
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- 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
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
Abstract
The invention relates to the technical field of superconducting wires, in particular to an iron-based superconducting multi-core wire and a preparation method and application thereof. According to the preparation method provided by the invention, a plurality of iron-based superconducting tapes are put into a multi-core wire sheath to obtain a complex; the iron-based superconducting strip comprises a pre-textured iron-based superconducting core, and the cross section of the multi-core strip sheath is rectangular or square; rolling or drawing the composite to obtain an initial multi-core wire, wherein the rolling adopts hole type rolling or four-roller rolling, and the drawing adopts a square hole die; and carrying out heat treatment on the initial multi-core wire rod in a protective gas or vacuum environment to obtain the iron-based superconducting multi-core wire rod. The preparation method provided by the invention can effectively improve the texturing degree of the superconducting phase crystal grains in the iron-based superconducting multi-core wire rod, thereby improving the current transmission performance of the wire rod.
Description
Technical Field
The invention relates to the technical field of superconducting wires, in particular to an iron-based superconducting multi-core wire and a preparation method and application thereof.
Background
The iron-based superconducting material can be divided into a plurality of material systems according to the composition ratio and the crystal structure of a parent compound, wherein a 1111 system (SmFeAsO is adopted)1-xFxAs represented) and 122 system (as Ba1-xKxFe2As2And Sr1-xKxFe2As2For representation), the iron-based superconductor has higher superconducting transition temperature (at present, the highest respectively is 58K and 38K), the upper critical field of the two can exceed 100T, and simultaneously, the iron-based superconductor has smaller anisotropy, has unique application advantages in the field of high field strength electricity, and has stronger application potential in the fields of next generation high field nuclear Magnetic Resonance Imaging (MRI), superconducting energy storage systems (SMES), nuclear magnetic resonance spectrometers (NMR), future high energy particle accelerators, controllable nuclear fusion devices and the like. In addition, the iron-based superconducting material can be prepared into wires and strips by a powder tube-filling method with simpler process and lower cost.
At present, the typical process for preparing the iron-based superconducting multi-core wire by adopting the powder tube loading method is to prepare the iron-based superconducting single-core round wire by adopting a round die drawing process, then cut the iron-based superconducting single-core round wire into a plurality of short samples with equal length, compound the short samples into a metal round tube, and prepare the multi-core round wire by adopting cold processing processes such as rotary swaging, drawing and the like. The wire rod obtained by the preparation method has the main problems that the grain orientation in the superconducting core is random, and the wide-angle grain boundary among grains can obviously reduce the transmission critical current of the wire rod. The existing method for improving the grain orientation is to roll a multi-core round wire into a multi-core strip by adopting a flat roll rolling method, and in the process, the grain in the superconducting core is induced to generate textured orientation by mechanical deformation force, so that the current carrying performance of the multi-core strip is improved.
However, from the practical application point of view, the wire is more beneficial to stranding of cables and winding of magnet coils than the tape, so that the preparation of the iron-based superconducting multi-core wire with high performance is more beneficial to the future practical application.
Disclosure of Invention
In view of the above, the invention provides an iron-based superconducting multi-core wire and a preparation method and application thereof.
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 multi-core wire, which comprises the following steps:
loading a plurality of iron-based superconducting strips into a multi-core wire sheath to obtain a complex; the iron-based superconducting strip comprises a textured iron-based superconducting core, and the cross section of the multi-core strip sheath is rectangular or square;
rolling or drawing the composite to obtain an initial multi-core wire, wherein the rolling adopts hole type rolling or four-roller rolling, and the drawing adopts a square hole die;
and carrying out heat treatment on the initial multi-core wire rod in a protective gas or vacuum environment to obtain the iron-based superconducting multi-core wire rod.
Preferably, the iron-based superconducting tape comprises a single-core iron-based superconducting tape and/or a multi-core iron-based superconducting tape;
the preparation method of the single-core iron-based superconducting tape comprises the following steps:
loading the iron-based superconducting material into a strip sheath to obtain a sheath superconducting material;
sequentially carrying out rotary swaging, drawing and rolling on the sheathed superconducting material to obtain a single-core iron-based superconducting strip;
the preparation method of the multi-core iron-based superconducting tape comprises the following steps:
loading the iron-based superconducting material into a strip sheath to obtain a sheath superconducting material;
sequentially carrying out rotary swaging and drawing on the sheathed superconducting material to obtain an iron-based superconducting round wire;
loading a plurality of iron-based superconducting round wires into a tape sheath to obtain sheath superconducting round wires, wherein the number of the iron-based superconducting round wires is more than or equal to 2;
and performing rotary swaging, drawing and rolling on the sheathed superconducting round wire in sequence to obtain the multi-core iron-based superconducting strip.
Preferably, the thickness of the iron-based superconducting tape is 0.1-10 mm independently, the width is 1-100 mm independently, and the length is 10-2000 mm independently.
Preferably, the wall thickness of the cross section of the multi-core wire sheath is 0.5-50 mm, the side length of the cross section of the multi-core wire sheath is 2-200 mm, and the length of the multi-core wire sheath is larger than or equal to that of the iron-based superconducting strip.
Preferably, the heat preservation temperature of the heat treatment is 500-1200 ℃, the heat preservation time of the heat treatment is 0.5-10 h, and the pressure of the protective gas is 0.1-200 MPa.
Preferably, the chemical composition of the iron-based superconducting material is doped with AFe2As2And/or doped LnOFePn;
the doped AFe2As2Wherein A is Ba, Sr, K, Cs, Ca or Eu, and the doped AFe2As2The medium doping element is one or more of K, Na, P and Co;
ln in the doped LnOFePN is La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho or Y, Pn in the doped LnOFePN is P or As, and the doping element in the doped LnOFePN is F.
Preferably, the multi-core wire sheath material comprises copper, iron, nickel, silver, manganese, titanium, niobium, tantalum, an alloy with the metal elements as main components, stainless steel, low-carbon steel, a Monel alloy, a Hastelloy alloy or an Inconel alloy.
The invention provides the iron-based superconducting multi-core wire rod prepared by the preparation method in the technical scheme, and the cross section of the iron-based superconducting multi-core wire rod is square, rectangular or parallelogram.
Preferably, the side length of the cross section of the iron-based superconducting multi-core wire is 0.5-5 mm.
The invention provides application of the iron-based superconducting multi-core wire in the technical scheme in an iron-based superconducting cable or an iron-based superconducting magnet.
The invention provides a preparation method of an iron-based superconducting multi-core wire, which comprises the following steps: loading a plurality of iron-based superconducting strips into a multi-core wire sheath to obtain a complex; the iron-based superconducting strip comprises a pre-textured iron-based superconducting core, and the cross section of the multi-core strip sheath is rectangular or square; rolling or drawing the composite to obtain an initial multi-core wire, wherein the rolling adopts hole type rolling or four-roller rolling, and the drawing adopts a square hole die; subjecting the initial multi-core wire to a heat treatment in a protective gas or vacuum environment,and obtaining the iron-based superconducting multi-core wire. The preparation method provided by the invention adopts an iron-based superconducting strip comprising a pre-textured iron-based superconducting core as a raw material, adopts a multi-core wire sheath with a rectangular or square cross section to prepare a composite body, can ensure that the multi-core wire sheath and the iron-based superconducting strip have better matching degree, adopts pass rolling or four-roller rolling in the process of rolling and drawing the composite body, and adopts a square hole die to effectively control the cross section of a wire to form a square, a rectangle or a parallelogram, thereby effectively reducing the degree of the random transformation of the grain orientation arrangement of the superconducting core in the iron-based superconducting strip during rolling and drawing. Therefore, the invention not only can prepare the shape of the finished product into a wire rod, but also can further improve the volume percentage content of the single-oriented crystal grains in the superconducting core compared with the traditional circular die drawing process. The preparation method provided by the invention can effectively improve the texturing degree of the superconducting phase crystal grains in the iron-based superconducting multi-core wire rod, thereby improving the current transmission performance of the wire rod. The results of the examples show that the iron-based superconducting multi-core wire product provided by the invention is detected by Electron Back Scattering Diffraction (EBSD), the volume percentage content of the grain boundary with the grain boundary included angle of less than 10 degrees in the superconducting core is more than or equal to 10 percent, the minimum difference between two diagonal deviation lines of the cross section of the wire product is 2 percent, and the transmission critical current density of the wire under the temperature of 4.2K and the magnetic field strength of 10T is more than or equal to 1.2 multiplied by 104A/cm2。
The preparation method provided by the invention is simple and easy to implement, has lower cost, and is beneficial to the development of iron-based superconducting cables and superconducting magnets.
Drawings
FIG. 1 is a schematic view of an iron-based superconducting multi-core wire rod prepared in example 1 of the present invention;
FIG. 2 is a schematic view of an iron-based superconducting multi-core wire rod prepared in example 3 of the present invention;
1-iron-based superconducting core, 2-single-core iron-based superconducting strip, 3-strip sheath, 4-multi-core wire sheath and 5-multi-core iron-based superconducting strip.
Detailed Description
The invention provides a preparation method of an iron-based superconducting multi-core wire, which comprises the following steps:
loading a plurality of iron-based superconducting strips into a multi-core wire sheath to obtain a complex; the iron-based superconducting strip comprises a textured iron-based superconducting core, and the cross section of the multi-core strip sheath is rectangular or square;
rolling or drawing the composite to obtain an initial multi-core wire, wherein the rolling adopts hole type rolling or four-roller rolling, and the drawing adopts a square hole die;
and carrying out heat treatment on the initial multi-core wire rod in a protective gas or vacuum environment to obtain the iron-based superconducting multi-core wire rod.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art, unless otherwise specified.
A plurality of iron-based superconducting strips are put into a multi-core wire sheath to obtain a complex; the iron-based superconducting tape comprises a textured iron-based superconducting core, and the cross section of the multi-core wire sheath is rectangular or square.
In the present invention, the iron-based superconducting tape preferably includes a single core iron-based superconducting tape and/or a multi core iron-based superconducting tape;
in the present invention, the method for preparing the single core iron-based superconducting tape preferably comprises the steps of:
loading an iron-based superconducting material (hereinafter referred to as a first iron-based superconducting material) into a tape sheath (hereinafter referred to as a first tape sheath) to obtain a sheath superconducting material (hereinafter referred to as a first sheath superconducting material);
the first clad superconducting material is subjected to swaging (hereinafter referred to as first swaging), drawing (hereinafter referred to as first drawing), and rolling (hereinafter referred to as first rolling) in this order to obtain a single core iron-based superconducting tape.
The present invention obtains a sheathed superconducting material by loading an iron-based superconducting material (hereinafter referred to as a first iron-based superconducting material) into a tape sheath (hereinafter referred to as a first tape sheath).
In the present invention, the chemical composition of the first iron-based superconducting material is preferably doped with AFe2As2And/or doped LnOFePn.
In the present invention, the doped AFe2As2A in (A) is preferably Ba, Sr, K, Cs, Ca or Eu, and the AFe is doped2As2The medium doping element is preferably one or more of K, Na, P and Co, and more preferably K, Na, P or Co. In the present invention, the doped AFe2As2When the medium doping element is K and/or Na, the doping AFe2As2The mass percentage of atoms of the medium doping elements is preferably 2-18%. In the present invention, the doped AFe2As2When the medium doping element is P and/or Co, the doping AFe2As2The mass percentage of atoms of the medium doping elements is preferably 4-36%.
In the invention, Ln in the doped LnOFePN is preferably La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho or Y, Pn in the doped LnOFePN is preferably P or As, and the doping element in the doped LnOFePN is preferably F. In the invention, the atomic mass percentage of the doping elements in the doped LnOFePN is preferably 3-22%.
In the invention, the first iron-based superconducting material has higher superconducting critical temperature and critical magnetic field.
In the present invention, the material of the first strip sheath preferably includes one or more of silver, silver alloy, copper alloy, niobium, iron and stainless steel. In a specific embodiment of the present invention, when the material of the first strip sheath preferably includes two or more of silver, silver alloy, copper alloy, niobium, iron, and stainless steel, the first strip sheath is preferably used by nesting the strip sheaths of the two or more materials.
In the invention, the wall thickness of the first belt wrap is preferably 0.5-50 mm, and more preferably 1-10 mm.
In the present invention, the cross-sectional shape of the first tape jacket is preferably circular. In the invention, the outer diameter of the first belt sheath is preferably 8-50 mm
According to the invention, the strip sheath can protect the iron-based superconducting core and has better electric and heat conducting properties.
After the first clad superconducting material is obtained, the first clad superconducting material is subjected to first rotary swaging, first drawing and first rolling in sequence to obtain the single-core iron-based superconducting strip.
The invention has no special requirements on the specific implementation processes of the first rotary swaging, the first drawing and the first rolling.
In the invention, the thickness of the single-core iron-based superconducting tape is preferably 0.1-10 mm, and more preferably 0.2-8 mm.
In the invention, the width of the single-core iron-based superconducting tape is preferably 1-100 mm, and preferably 3-82 mm.
In the invention, the length of the single-core iron-based superconducting tape is preferably 10-2000 mm, and more preferably 20-1500 mm.
In the invention, the preparation method of the multi-core iron-based superconducting tape comprises the following steps:
loading an iron-based superconducting material (hereinafter referred to as a second iron-based superconducting material) into a tape sheath (hereinafter referred to as a second tape sheath) to obtain a sheath superconducting material (hereinafter referred to as a second sheath superconducting material);
sequentially performing rotary swaging (hereinafter referred to as second rotary swaging) and drawing (hereinafter referred to as second drawing) on the second jacket superconducting material to obtain an iron-based superconducting round wire;
loading a plurality of iron-based superconducting round wires into a tape sheath (hereinafter referred to as a third tape sheath) to obtain sheath superconducting round wires, wherein the number of the iron-based superconducting round wires is more than or equal to 2;
and performing swaging (hereinafter referred to as third swaging), drawing (hereinafter referred to as third drawing) and rolling (hereinafter referred to as third rolling) on the sheathed round superconducting wire in sequence to obtain the multi-core iron-based superconducting tape.
The method comprises the steps of loading an iron-based superconducting material (hereinafter referred to as a second iron-based superconducting material) into a tape sheath (hereinafter referred to as a second tape sheath) to obtain a sheath superconducting material (hereinafter referred to as a second sheath superconducting material);
in the present invention, the protection range of the second iron-based superconducting material is preferably the same as the protection range of the first iron-based superconducting material, and details thereof are not repeated herein.
In the present invention, the protection range of the material and the size of the second strip sheath is preferably the same as the protection range of the material and the size of the first iron strip sheath, and details are not repeated herein.
After the second jacket superconducting material is obtained, the second jacket superconducting material is subjected to second rotary swaging and second drawing in sequence to obtain the iron-based superconducting round wire.
The invention has no special requirements on the specific implementation process of the second rotary swaging and the second drawing.
After the iron-based superconducting round wires are obtained, a plurality of iron-based superconducting round wires are put into a third tape sheath to obtain sheathed superconducting round wires, wherein the number of the iron-based superconducting round wires is more than or equal to 2.
In the invention, the number of the iron-based superconducting round wires is more than or equal to 2, and preferably 3-200.
In the present invention, the protection range of the material and the size of the first loose strip sheath is preferably the same as the protection range of the material and the size of the first iron strip sheath, and the details are not repeated herein.
After the sheathed superconducting round wire is obtained, the sheathed superconducting round wire is subjected to third rotary swaging, third drawing and third rolling in sequence to obtain the multi-core iron-based superconducting strip.
The invention has no special requirements on the specific implementation processes of the third rotary swaging, the third drawing and the third rolling.
In the invention, the thickness of the multi-core iron-based superconducting tape is preferably 0.1-10 mm, and more preferably 0.2-8 mm.
In the invention, the width of the multi-core iron-based superconducting tape is preferably 1-100 mm, and preferably 3-82 mm.
In the invention, the length of the multi-core iron-based superconducting tape is preferably 10-2000 mm, and more preferably, the inner length is 20-1500 mm.
In the invention, the iron-based superconducting strip comprises a textured iron-based superconducting core, so that the high iron-based superconducting multi-core wire superconducting core can obtain better grain orientation.
In the present invention, the number of the iron-based superconducting tapes is not less than 2, preferably not less than 6.
In the embodiment of the present invention, the number of the iron-based superconducting tapes is preferably 13, 9, 6, 10 or 50.
In the present invention, the multi-core wire sheath is preferably made of copper, iron, nickel, silver, manganese, titanium, niobium, tantalum, an alloy containing the above metal elements as a main component, stainless steel, low carbon steel, Monel alloy, Hastelloy alloy, or Inconel alloy.
In the invention, the preferable material of the multi-core wire sheath is the material which can further improve the overall mechanical strength of the multi-core wire product and has better electric conduction and heat conduction performances.
In the invention, the cross section of the multi-core wire sheath is rectangular or square.
In the invention, the wall thickness of the cross section of the multi-core wire sheath is preferably 0.5-50 mm, and more preferably 1-35 mm.
In the invention, the side length of the cross section of the multi-core wire sheath is preferably 2-200 mm, and more preferably 3.5-158 mm.
In the invention, the length of the multi-core wire sheath is preferably more than or equal to that of the iron-based superconducting tape.
In the present invention, the inner size of the multi-core wire sheath is preferably matched with the total size of the plurality of iron-based superconducting tapes.
After obtaining the composite, the present invention performs rolling (hereinafter referred to as fourth rolling) or drawing (hereinafter referred to as fourth drawing) of the composite using a square hole die to obtain an initial multi-core wire rod.
In the present invention, it is preferable that both end faces of the multi-core wire jacket are sealed before the fourth rolling or the fourth drawing.
In the invention, the fourth rolling adopts hole type rolling or four-roller rolling.
In the invention, the drawing adopts a square hole die.
According to the preparation method provided by the invention, the multi-core wire sheath with the square or rectangular cross section is preferably adopted to be combined with the hole-type rolling process, the four-high rolling mill process or the square hole die drawing process, so that the cross section shape of the wire can be effectively controlled in the process of carrying out fourth rotary swaging and fourth drawing on the composite body, meanwhile, the influence of the fourth rotary swaging and fourth drawing on the arrangement of crystal grains in the superconducting core is effectively reduced, and the difference of two diagonal deviation lines of the cross section of the finally prepared wire is less than or equal to 2%.
After the initial multi-core wire rod is obtained, the initial multi-core wire rod is subjected to heat treatment in a protective gas or vacuum environment to obtain the iron-based superconducting multi-core wire rod.
In the invention, the heat preservation temperature of the heat treatment is preferably 500-1200 ℃, and more preferably 550-1100 ℃.
In the invention, the heat preservation time of the heat treatment is preferably 0.5-10 h, and more preferably 1-8 h.
In the present invention, the heat treatment is performed in a protective gas or vacuum atmosphere.
In the present invention, the protective gas is preferably an inert gas, and more preferably Ar.
In the present invention, the pressure of the protective gas is preferably 0.1 to 200MPa, and more preferably 10 to 150 MPa.
The invention provides the iron-based superconducting multi-core wire rod prepared by the preparation method in the technical scheme, and the cross section of the iron-based superconducting multi-core wire rod is square, rectangular or parallelogram.
In the invention, the side length of the cross section of the iron-based superconducting multi-core wire is preferably 0.5-5 mm, and more preferably 1-4.5 mm.
In the invention, the volume percentage content of the crystal boundary with the crystal boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire rod is more than or equal to 10 percent.
In the invention, the difference of two diagonal deviation lines of the section of the iron-based superconducting multi-core wire rod is at least 2 percent,
the invention provides application of the iron-based superconducting multi-core wire in the technical scheme in an iron-based superconducting cable or an iron-based superconducting magnet.
Compared with a strip material, the iron-based superconducting multi-core wire provided by the invention is more beneficial to stranding of a cable and winding of a magnet coil.
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
BaFe doped with K element2As2The iron-based superconducting material is filled into a pure silver metal tube with the outer diameter of 8mm and the wall thickness of 1mm, and is prepared into an iron-based superconducting single-core strip with the thickness of 0.3mm and the width of 4mm through rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 100mm, stacking 13 short samples, and then putting the stacked short samples into a pure copper square metal pipe with the side length of 6mm meters, the wall thickness of 1mm and the length of 100 mm;
processing the multi-core complex into a wire rod with the side length of 1.2mm by adopting a hole-shaped rolling mill, wherein the deviation of two diagonal lines on the cross section of the wire rod is 8 percent;
and carrying out heat treatment on the wire rod in a vacuum environment, wherein the heat treatment temperature is 750 ℃, and the heat preservation time is 2 hours, so as to obtain the iron-based superconducting multi-core wire rod.
Tests prove that the volume percentage content of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 15 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 2.3 multiplied by 104A/cm2。
Example 2
BaFe doped with K element2As2Iron-based superconducting powder is filled into a pure silver metal tube with the outer diameter of 8mm and the wall thickness of 1.5mm, and is prepared into an iron-based superconducting single-core strip with the thickness of 0.3mm and the width of 2.8mm through rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 100mm, stacking 9 short samples, and then putting the stacked short samples into a copper-nickel alloy square metal tube with the side length of 5mm, the wall thickness of 1mm and the length of 100 mm;
processing the multi-core complex into a wire with the side length of 0.6mm by adopting a hole-shaped rolling mill, wherein the deviation of two diagonal lines on the cross section of the wire is 10 percent;
and (3) carrying out heat treatment on the wire in argon gas at 0.1MPa, wherein the heat treatment temperature is 850 ℃, and the heat preservation time is 1h, so as to obtain the iron-based superconducting multi-core wire.
Tests prove that the volume percentage content of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 13 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 2.1 multiplied by 104A/cm2。
Example 3
SrFe doped with K element2As2Iron-based superconducting powder is filled into a pure silver metal tube with the outer diameter of 14mm and the wall thickness of 1.5mm, a round wire with the diameter of 1.5mm is prepared after rotary swaging and drawing, the round wire is cut into short samples with the length of 200mm, 7 short samples are compounded into a silver-manganese alloy tube with the outer diameter of 8mm and the wall thickness of 1.5mm, and an iron-based superconducting seven-core strip with the thickness of 0.4mm and the width of 4.8mm is prepared through rotary swaging, drawing and rolling;
cutting an iron-based superconducting seven-core strip into short samples with the length of 150mm, stacking 9 short samples, and then compositely filling the stacked short samples into a pure iron square metal tube with the side length of 9mm, the wall thickness of 2mm and the length of 150 mm;
processing the multi-core complex into a wire with the side length of 2.0mm by adopting a hole-shaped rolling mill, wherein the deviation of two diagonal lines on the cross section of the wire is 5 percent;
and (3) carrying out heat treatment on the wire rod in 0.1MPA argon gas at the heat treatment temperature of 900 ℃ for 1h to obtain the iron-based superconducting multi-core wire rod.
Tests prove that the volume percentage of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 11 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 1.6 multiplied by 104A/cm2。
Example 4
BaFe doped with Na element2As2Iron-based superconducting powder is filled into a pure silver metal tube with the outer diameter of 8mm and the wall thickness of 1.5mm, and is subjected to rotary swaging, drawing,Rolling to prepare an iron-based superconducting single-core strip with the thickness of 0.3mm and the width of 1.8 mm;
cutting an iron-based superconducting single-core strip into short samples with the length of 100mm, stacking 6 short samples, then compositely loading the stacked short samples into a pure copper square metal tube with the side length of 4mm, the wall thickness of 1mm and the length of 120mm, and sealing two ends of the wire;
processing the multi-core complex into a wire with the side length of 1.0mm by adopting a hole-shaped rolling mill, wherein the deviation of two diagonal lines on the cross section of the wire is 8 percent;
and (3) carrying out heat treatment on the wire in argon gas of 200MPa, wherein the heat treatment temperature is 700 ℃, and the heat preservation time is 4h, so as to obtain the iron-based superconducting multi-core wire.
Tests prove that the volume percentage of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 11 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 5.2 multiplied by 104A/cm2。
Example 5
Filling F element doped SmOFeAs iron-based superconducting powder into a pure iron metal pipe with the outer diameter of 12mm and the wall thickness of 1.5mm, and preparing an iron-based superconducting single-core strip with the thickness of 0.6mm and the width of 8mm by rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 300mm, stacking 10 short samples, and then compositely loading the stacked short samples into a rectangular Hastelloy alloy tube with the width multiplied by the length of 8.5 multiplied by 10.5mm, the wall thickness of 1mm and the length of 300 mm;
processing the multi-core complex into a wire with the side length of 3.0 multiplied by a four-roller mill, wherein the deviation of two diagonal lines on the cross section of the wire is 2 percent;
and carrying out heat treatment on the wire rod in a vacuum environment, wherein the heat treatment temperature is 1200 ℃, and the heat preservation time is 0.5h, so as to obtain the iron-based superconducting multi-core wire rod.
Tests prove that the volume percentage of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 18 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 1.2 multiplied by 104A/cm2。
Example 6
CaFe doped with K element4As4Iron-based superconducting powder is filled into a pure silver metal tube with the outer diameter of 8mm and the wall thickness of 1mm, and is prepared into an iron-based superconducting single-core strip with the thickness of 0.3mm and the width of 3.8mm through rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 500mm, stacking 50 short samples, then compositely loading the stacked short samples into a pure copper square metal tube with the side length of 12mm, the wall thickness of 2mm and the length of 600mm, and sealing two ends of the wire;
processing the multi-core complex into a wire with the side length of 2.0mm by adopting a square hole die drawing process, wherein the deviation of two diagonal lines on the cross section of the wire is 3 percent;
and (3) carrying out heat treatment on the wire in argon gas at 150MPa, wherein the heat treatment temperature is 600 ℃, and the heat preservation time is 1h, so as to obtain the iron-based superconducting multi-core wire.
Tests prove that the volume percentage content of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 15 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 2.8 multiplied by 104A/cm2。
Example 7
BaFe doped with K element2As2Iron-based superconducting powder is filled into a pure silver metal tube with the outer diameter of 50mm and the wall thickness of 5mm, and is prepared into an iron-based superconducting single-core strip with the thickness of 10mm and the width of 100mm through rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 2000mm, stacking 10 short samples, and then compositely filling the stacked short samples into a silver-tin alloy square metal tube with the side length of 200mm, the wall thickness of 50mm and the length of 100 mm;
processing the multi-core complex into a wire rod with the side length of 1.5mm by adopting a hole type rolling mill and a square hole die drawing process, wherein the deviation of two diagonal lines on the cross section of the wire rod is 3 percent;
and (3) carrying out heat treatment on the wire in 15MPa argon at the heat treatment temperature of 880 ℃ for 1h to obtain the iron-based superconducting multi-core wire.
Tests prove that the volume of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire material18 percent of the total weight of the alloy wire, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 8.5 multiplied by 104A/cm2。
Example 8
Filling the F element doped NdOFeAs iron-based superconducting powder into a pure nickel metal pipe with the outer diameter of 5mm and the wall thickness of 0.5mm, and preparing an iron-based superconducting single-core strip with the thickness of 0.1mm and the width of 1mm by rotary swaging, drawing and rolling;
cutting an iron-based superconducting single-core strip into short samples with the length of 10mm, stacking the 10 short samples, and then compositely filling the stacked short samples into a square pure niobium pipe with the side length of 2mm, the wall thickness of 0.5mm and the length of 15 mm;
processing the multi-core complex into a wire rod with the side length of 0.5mm by adopting a four-roller rolling mill and a hole type rolling mill, wherein the deviation of two diagonal lines on the cross section of the wire rod is 10 percent;
and carrying out heat treatment on the wire rod in a vacuum environment, wherein the heat treatment temperature is 500 ℃, and the heat preservation time is 10 hours, so as to obtain the iron-based superconducting multi-core wire rod.
Tests prove that the volume percentage content of the grain boundary with the grain boundary included angle less than 10 degrees in the superconducting core of the iron-based superconducting multi-core wire is 10 percent, and the transmission critical current density of the wire under the magnetic field strength of 4.2K and 10T is 1.2 multiplied by 104A/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 multi-core wire rod is characterized by comprising the following steps:
loading a plurality of iron-based superconducting strips into a multi-core wire sheath to obtain a complex; the iron-based superconducting strip comprises a textured iron-based superconducting core, and the cross section of the multi-core strip sheath is rectangular or square;
rolling or drawing the composite to obtain an initial multi-core wire, wherein the rolling adopts hole type rolling or four-roller rolling, and the drawing adopts a square hole die;
and carrying out heat treatment on the initial multi-core wire rod in a protective gas or vacuum environment to obtain the iron-based superconducting multi-core wire rod.
2. The production method according to claim 1, wherein the iron-based superconducting tape comprises a single core iron-based superconducting tape and/or a multi core iron-based superconducting tape;
the preparation method of the single-core iron-based superconducting tape comprises the following steps:
loading the iron-based superconducting material into a strip sheath to obtain a sheath superconducting material;
sequentially carrying out rotary swaging, drawing and rolling on the sheathed superconducting material to obtain a single-core iron-based superconducting strip;
the preparation method of the multi-core iron-based superconducting tape comprises the following steps:
loading the iron-based superconducting material into a strip sheath to obtain a sheath superconducting material;
sequentially carrying out rotary swaging and drawing on the sheathed superconducting material to obtain an iron-based superconducting round wire;
loading a plurality of iron-based superconducting round wires into a tape sheath to obtain sheath superconducting round wires, wherein the number of the iron-based superconducting round wires is more than or equal to 2;
and performing rotary swaging, drawing and rolling on the sheathed superconducting round wire in sequence to obtain the multi-core iron-based superconducting strip.
3. The method according to claim 1 or 2, wherein the iron-based superconducting tape has a thickness of 0.1 to 10mm, a width of 1 to 100mm, and a length of 10 to 2000 mm.
4. The preparation method according to claim 1, wherein the wall thickness of the cross section of the multi-core wire sheath is 0.5-50 mm, the side length of the cross section of the multi-core wire sheath is 2-200 mm, and the length of the multi-core wire sheath is larger than or equal to that of the iron-based superconducting tape.
5. The preparation method according to claim 1, wherein the heat treatment is carried out at a holding temperature of 500 to 1200 ℃, for 0.5 to 10 hours, and under a pressure of 0.1 to 200 MPa.
6. The method according to claim 2, wherein the chemical composition of the iron-based superconducting material is doped with AFe2As2And/or doped LnOFePn;
the doped AFe2As2Wherein A is Ba, Sr, K, Cs, Ca or Eu, and the doped AFe2As2The medium doping element is one or more of K, Na, P and Co;
ln in the doped LnOFePN is La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho or Y, Pn in the doped LnOFePN is P or As, and the doping element in the doped LnOFePN is F.
7. The method as claimed in claim 1, wherein the multi-core wire sheath material comprises copper, iron, nickel, silver, manganese, titanium, niobium, tantalum, alloy containing the above metal elements as main components, stainless steel, mild steel, Monel alloy, Hastelloy alloy or Inconel alloy.
8. The iron-based superconducting multi-core wire rod prepared by the preparation method according to any one of claims 1 to 7, wherein the cross-sectional shape of the iron-based superconducting multi-core wire rod is square, rectangular or parallelogram.
9. The iron-based superconducting multi-core wire according to claim 8, wherein the side length of the cross section of the iron-based superconducting multi-core wire is 0.5-5 mm.
10. Use of the iron-based superconducting multi-core wire of claim 8 or 9 in an iron-based superconducting cable or an iron-based superconducting magnet.
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