CN114566326A - Method for obtaining composite sheathed iron-based superconducting wire strip by extrusion molding - Google Patents
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000001125 extrusion Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052709 silver Inorganic materials 0.000 claims abstract description 23
- 239000004332 silver Substances 0.000 claims abstract description 23
- 239000010935 stainless steel Substances 0.000 claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000013329 compounding Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000002243 precursor Substances 0.000 claims abstract description 4
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910000792 Monel Inorganic materials 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 239000011133 lead Substances 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 239000002887 superconductor Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 238000005245 sintering Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
-
- 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
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding, which relates to the technical field of iron-based superconductors.A sintered iron-based superconducting precursor powder is filled into a clean inner sheath pipe, and the end part of a pipe blank of the inner sheath pipe is sealed by welding after vacuum degassing to obtain an initial pipe blank to be extruded; extruding and forming the pipe blank to be extruded by adopting a press and combining an extrusion die to form an inner sheath extrusion single-core wire; and the inner sheath extrudes the single-core wire to a proper size through further drawing, and is arranged in the prepared outer sheath to realize the compounding of the two sheath materials, and the composite material is processed to a target size. The Jc of the stainless steel/silver iron-based superconducting strip prepared by the method exceeds 1.4 multiplied by 10 under 4.2K and 10T5A/cm2Greatly improves the transmission performance of the stainless steel/silver composite sheathed iron-based superconducting strip, and realizes the large stainless steel/silver composite sheathed iron-based superconducting strip sintered at normal pressure for the first timeThe practical application index of the strip material of the iron-based superconducting wire is greatly surpassed (10)5A/cm2)。
Description
Technical Field
The invention relates to the technical field of iron-based superconductors, in particular to a method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion forming.
Background
The iron-based superconductor has the advantages of high critical transition temperature, small anisotropy, high upper critical field and the like, is suitable for being widely applied to the fields of energy, medical treatment, large scientific engineering and the like, and is a novel high-temperature superconductor with the greatest development prospect at present. The high-performance superconducting wire and strip is the basis for the practical application of superconducting materials in high-voltage and high-field. At present, a Powder-in-tube method (PIT method for short) is generally adopted for preparing the iron-based superconducting material, and the method overcomes the processing difficulty caused by low ductility and toughness of the iron-based superconducting material. The existing preparation process is to pack superconducting powder into a metal sheath, and then to prepare superconducting wire strips by mechanical processing means such as drawing, rolling and the like. The transmission Jc of the iron-based superconducting wire rod prepared by sheath drawing and rolling reported by multiple subject groups exceeds 10 under 4.2K and 0-10T5A/cm2The method provides a basis for large-scale production and application.
The performance of the iron-based superconducting wire strip is greatly improved, but 10 of the performance is5A/cm2The critical current density of the superconducting magnet is far less than that of an iron-based superconductor pair splitting JcLimit value of (about 10)8A/cm2) Even if compared to iron-based thin films or single crystals (about 10)6A/cm2) There is still a gap. It is well known that the compactness of the superconducting phase in the wire strip is a key factor in determining the current-carrying performance. However, many studies show that the density of the superconducting core of the superconducting wire prepared by rotary swaging, drawing and rolling is generally not high, and the upper limit of densification is determined by the stress state under the forming process, so that the current-carrying performance is limited. In order to increase the compactness of the superconducting core in the final wire strip, a number of workers have developed composite sheathing techniques. The inner layer sheath is a traditional silver sheath, and the outer layer sheath is made of metal materials with strong mechanical properties, such as silver-tin alloy, copper, stainless steel, nickel-based alloy and the like. The outer layer sheath improves the mechanical property of the wire strip and simultaneously increases the density of the superconducting core in the finally prepared sample. For example, related reports show stainless steelsThe hardness of the superconducting core of the/silver composite sheathed strip is usually twice that of the pure silver strip, and the superconductivity of the superconducting core is transmitted close to the current density JcCan reach 9 x 104A/cm2. The current preparation process of the composite sheathed iron-based superconducting strip has two obvious defects. Firstly, the preparation process is long and complex, the whole preparation process needs multiple processes such as rotary swaging, drawing, tube blank compounding, secondary drawing, rolling and the like, and the output efficiency is usually only 1m/10h due to extremely low single-pass processing amount. Secondly, the density of the superconducting core in the composite sheathed iron-based superconducting wire strip prepared by the prior art still does not reach a higher level, and the sintering temperature is restricted by the properties of the outer layer sheath material. For example, the copper/silver composite sheath sample has lower sintering temperature due to the mutual reaction of the two sheath materials at high temperature, thereby affecting the densification level; the stainless steel has softening effect at high temperature, and the hardness (namely the compactness) of the superconducting core in the stainless steel/silver composite sheathed iron-based superconducting strip can be greatly reduced by selecting higher heat treatment temperature. Relevant researches indicate that the further improvement of the densification level of the superconducting core in the composite sheathed iron-based superconducting wire strip can greatly improve the superconducting transmission performance of the composite sheathed iron-based superconducting wire strip, and is also a key point to be broken through in the current preparation process of the composite sheathed iron-based superconducting wire strip.
The current preparation process of the composite sheathed iron-based superconducting tapes (including 122 series, 11 series, 1111 series, 1144 series and the like) has two obvious defects. Firstly, the preparation process is long and complex, the whole preparation process needs multiple procedures of rotary swaging, drawing, compounding, secondary rotary swaging, drawing, rolling and the like, and the yield efficiency is usually only 1m/10h due to extremely low single-pass reduction. Secondly, the density of the superconducting core in the composite sheathed iron-based superconducting wire strip prepared by the prior art still does not reach a higher level, and the sintering temperature is restricted by the properties of the outer layer sheath material. Taking the stainless steel/silver composite sheathed iron-based superconducting strip as an example, the stainless steel/silver-iron-based superconducting strip usually selects a lower sintering heat treatment temperature, and has a certain difference with the iron-based superconducting optimization phase temperature, thereby limiting the further improvement of the transmission performance of the composite sheathed superconducting strip. Similarly, the selection of high temperature heat treatment of the stainless steel/silver iron-based superconducting tape will bring about a sharp decrease in the hardness (i.e., compactness) of the superconducting core. This conflict is considered to be a development bottleneck of the stainless steel/silver iron-based superconducting tape.
Disclosure of Invention
Aiming at the defects of technical conflict between the density of the superconducting core and the high sintering temperature, low forming efficiency and the like of the existing preparation process of the composite sheathed iron-based superconducting strip, the invention provides a method for obtaining a novel composite sheathed iron-based superconducting strip with high-density superconducting core and high forming efficiency.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding, which comprises the following steps:
firstly, loading sintered iron-based superconducting precursor powder into a clean inner-wrapping sleeve, and welding and sealing the end part of a tube blank of the inner-wrapping sleeve after vacuum degassing to obtain an initial tube blank to be extruded;
secondly, extruding and forming the pipe blank to be extruded by adopting a press and combining an extrusion die to form an inner sleeve extrusion single-core wire;
thirdly, the inner sheath extrudes the single-core wire to a proper size through further drawing, and is placed inside the outer sheath prepared in advance to realize the compounding of the two sheath materials, and the wire and the strip materials with various target sizes are further processed.
Optionally, in the second step, the pipe blank to be extruded is placed in the extrusion cylinder, the top of the pipe blank to be extruded is contacted with a pressure head of a press, and the extrusion of the wire rod can be realized after the press applies pressure.
Optionally, the metal of the inner sleeve and the outer sleeve is at least one selected from gold, silver, copper, iron, niobium, nickel, chromium, tin, vanadium, manganese, titanium, zirconium, molybdenum, tungsten, lead, aluminum and zinc, or the metal of the inner sleeve and the outer sleeve is monel or low carbon steel or stainless steel or high carbon steel.
Compared with the prior art, the invention has the following technical effects:
1. the iron-based superconducting circular wires with different sizes from phi 50.0mm to phi 2.0mm are successfully extruded by adopting corresponding extrusion dies, the extrusion ratio is 7.2 at most, the single-pass surface reduction rate is 94% at most (from phi 8.0mm to phi 2.0mm), and the surface reduction efficiency is far higher than that of single-pass 10% in the traditional process (such as drawing and hole rolling). And when the traditional single-pass surface reduction of drawing and hole rolling is too large, the wire is often broken in the processing process. The extruded wire sample has smooth surface, no crack and no barb.
2. The extrusion forming round wire completely replaces the rotary swaging procedure in the existing preparation process of the composite sheathed iron-based superconducting strip, and the compounding with stainless steel can be realized only by a plurality of small-size drawing procedures. The method greatly improves the preparation efficiency of the silver-clad single-core wire, and shortens the subsequent preparation process flow of the stainless steel composite strip.
3. Compared with the traditional process, the density of the superconducting core in various composite sheathed iron-based superconducting wire strips prepared by the extrusion forming technology is greatly improved. For example, the stainless steel/silver composite sheathed iron-based superconducting strip prepared by the method can meet the requirement that the superconducting core still has extremely high superconducting core hardness (200Hv) at higher sintering temperature (over 850 ℃), which is far higher than the superconducting core hardness (150Hv) in the stainless steel/silver composite sheathed iron-based superconducting strip prepared by the traditional process. The results show that the compactness of the superconducting core in the Ba-122 stainless steel/silver composite sheathed iron-based superconducting strip is greatly improved by the extrusion forming preparation technology.
4. The transmission current test is carried out on the iron-based superconducting wire strip samples prepared by the invention, and the results show that the superconducting current transmission performance of various composite sheathed iron-based superconducting wire strips prepared by the invention is greatly improved compared with that of the iron-based superconducting wire strip prepared by the traditional process. Wherein, the J of the stainless steel/silver iron-based superconducting strip prepared by the invention is at 4.2K and 10TcMore than 1.4X 105A/cm2Greatly improves the transmission performance of the stainless steel/silver composite sheathed iron-based superconducting strip in the prior art, and realizes that the stainless steel/silver composite sheathed iron-based superconducting strip sintered at normal pressure greatly surpasses the practical application index of the iron-based superconducting wire strip for the first time (10)5A/cm2)。
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an extrusion die in the method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding according to the present invention;
FIG. 2 is a schematic structural diagram of a stainless steel/silver Ba-122 composite assembly tube blank prepared by the method for obtaining the composite sheathed iron-based superconducting wire strip by extrusion forming according to the invention;
FIG. 3 is a schematic flow chart of the method for obtaining the composite sheathed iron-based superconducting wire strip by extrusion molding according to the invention.
Description of reference numerals: 1. a stainless steel outer sheath; 2. silver inner sheath; 3. a superconducting core.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 to 3, the present embodiment provides a method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding, comprising the steps of:
step one, loading sintered iron-based superconducting precursor powder into a clean inner-wrapping sleeve, and welding and sealing the end part of a tube blank of the inner-wrapping sleeve after vacuum degassing to obtain an initial tube blank to be extruded;
secondly, extruding and forming the pipe blank to be extruded by adopting a press and combining an extrusion die to form an inner sheath extrusion single-core wire; specifically, the pipe blank to be extruded is placed in the extrusion cylinder, the top of the pipe blank to be extruded is in contact with a pressure head of a press, and the extrusion of a wire rod can be realized after the press applies pressure. Finally, the single-pass preparation of the iron-based superconducting single-core wire with different sizes of phi 50.0mm to phi 2.0mm, such as 122 series, 11 series, 1111 series and 1144 series, can be realized. The part of the extrusion die and the structural dimension related to the preparation of the phi 3.0mm single-core wire are shown in the following figure 1. The extrusion die is made of special steel, ensures that the die has stronger yield resistance under the working condition of large extrusion ratio, and ensures that the die has enough small roughness through fine processing means such as precision casting, washing, cutting, polishing and the like, so that the extrusion resistance of iron-based superconducting wires with different extrusion sizes is not more than 4 tons under the room temperature condition.
Thirdly, the inner sheath extrudes the single-core wire to a proper size through further drawing, and is placed inside the outer sheath prepared in advance to realize the compounding of the two sheath materials, and the wire and the strip materials with various target sizes are further processed.
As shown in fig. 2, in this embodiment, a stainless steel outer sheath 1 and a silver inner sheath 2 are used, and a superconducting core 3 is located inside the silver inner sheath 2.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding is characterized by comprising the following steps:
firstly, loading sintered iron-based superconducting precursor powder into a clean inner-wrapping sleeve, and welding and sealing the end part of a tube blank of the inner-wrapping sleeve after vacuum degassing to obtain an initial tube blank to be extruded;
secondly, extruding and forming the pipe blank to be extruded by adopting a press and combining an extrusion die to form an inner sheath extrusion single-core wire;
and thirdly, extruding the single-core wire by the inner sheath, further drawing the single-core wire to a proper size, placing the single-core wire inside a prepared outer sheath to realize the compounding of two sheath materials, and further processing the single-core wire to wire strips with various target sizes.
2. The method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding according to claim 1, wherein in the second step, the tube blank to be extruded is placed in an extrusion cylinder, the top of the tube blank to be extruded is contacted with a pressure head of a press, and the extrusion of the wire can be realized after the pressure of the press is applied.
3. The method for obtaining a composite sheathed iron-based superconducting wire strip by extrusion molding according to claim 1, wherein the metal of the inner sheath metal tube and the outer sheath is at least one selected from gold, silver, copper, iron, niobium, nickel, chromium, tin, vanadium, manganese, titanium, zirconium, molybdenum, tungsten, lead, aluminum and zinc, or the metal of the inner sheath tube and the outer sheath tube is Monel or low carbon steel or stainless steel or high carbon steel.
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