CN114373581A - Drawing die, superconducting strip and preparation method thereof - Google Patents
Drawing die, superconducting strip and preparation method thereof Download PDFInfo
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- CN114373581A CN114373581A CN202210042703.5A CN202210042703A CN114373581A CN 114373581 A CN114373581 A CN 114373581A CN 202210042703 A CN202210042703 A CN 202210042703A CN 114373581 A CN114373581 A CN 114373581A
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- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 5
- 239000002887 superconductor Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004321 preservation 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
-
- 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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Abstract
The invention relates to the technical field of superconducting wires, and provides a drawing die, a superconducting tape and a preparation method thereof, wherein the drawing die comprises the following components: the mould comprises a mould body, a mould core and a mould core, wherein a cavity with two open ends is formed in the axial direction of the mould body, the section of the cavity is polygonal, circular or kidney-shaped, and a multi-core composite metal pipe is suitable for being placed in the cavity; the cavity comprises a first opening and a second opening, a first slope is arranged on the die body corresponding to the first opening, and the bottom of the first slope is far away from the end face of the first opening; and a second slope surface is arranged corresponding to the second opening, and the bottom of the second slope surface is intersected with the end surface of the second opening. The multi-core composite metal pipe is placed in the cavity and is drawn, and in the drawing process, the cavity of the die can provide torsion constraint force for the multi-core composite metal pipe, so that the superconducting core in the metal pipe is prevented from being twisted, the relative position of the superconducting core of a final strip rolled subsequently is not changed, and the stability of the performance of the superconducting strip can be ensured.
Description
Technical Field
The invention relates to the technical field of superconducting tapes, in particular to a drawing die, a superconducting tape and a preparation method thereof.
Background
The iron-based compound superconducting material is a newly discovered compound superconductor, the highest superconducting transition temperature of the iron-based compound superconducting material reaches 55K at present, and the highest superconducting transition temperature is likely to be improved continuously, compared with the traditional low-temperature superconducting material, the iron-based compound superconducting material has the advantages of high transition temperature, large upper critical field, small dependence of a strong magnetic field of critical current and the like, and is a novel superconducting material with great application prospect in the range of 20-50K; compared with the oxide high-temperature superconducting material, the iron-based superconductor has simpler crystal structure, large coherence length, small anisotropy and simple preparation process, so that the preparation of the iron-based superconducting material is widely concerned internationally.
The critical transmission current density of the current iron-based superconductors exceeds 1.5X 105A/cm at 4.2K and 10T2Meanwhile, the first hundred-meter iron-based superconducting long wire has been prepared in 2017, and these indicate that the performance of the iron-based superconductor reaches the practical level.
In the preparation process of the superconducting tape, the multi-core composite metal tube is drawn, the superconducting tape is easy to twist due to a drawing die in the drawing process, but the twisting is not easy to find in the drawing process because the wire is circular, but the relative position of the superconducting core in the wire is obviously changed after the wire is subsequently rolled into a final tape, and the performance of the twisted superconducting tape is poor.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects that in the prior art, when a multi-core composite metal tube is drawn, a superconducting tape is easily twisted due to a drawing die in the drawing process, but the wire is circular, the twisting is not easily found in the drawing process, but after the wire is rolled into a final tape, the relative position of the superconducting core inside is obviously changed, and the performance of the twisted superconducting tape is deteriorated, so that the drawing die, the superconducting tape and the preparation method thereof are provided.
A drawing die comprising: the mould comprises a mould body, a mould core and a mould core, wherein a cavity with two open ends is formed in the axial direction of the mould body, the section of the cavity is polygonal, circular or kidney-shaped, and a multi-core composite metal pipe is suitable for being placed in the cavity;
the cavity comprises a first opening and a second opening, a first slope is arranged on the die body corresponding to the first opening, and the bottom of the first slope is far away from the end face of the first opening; and a second slope surface is arranged corresponding to the second opening, and the bottom of the second slope surface is intersected with the end surface of the second opening.
Optionally, in the drawing die, an inclination angle of the first slope is smaller than an inclination angle of the second slope.
Optionally, in the drawing die, the polygon is a regular hexagon or a regular octagon.
Optionally, in the drawing die, the circle is an ellipse or a perfect circle.
Optionally, in the drawing die, a depth of the first slope is smaller than a depth of the second slope.
The superconducting tape is drawn by the drawing die and comprises at least two superconducting cores.
A method for preparing a superconducting tape, comprising the steps of:
s1: grinding: crushing and grinding the sintered superconducting block material into powder under the protective atmosphere;
s2: drawing for the first time: filling the powder ground in the step S1 into a metal tube, and performing first drawing on the metal tube filled with the powder to a corresponding size to form a single-core superconducting wire, wherein the first drawing adopts circular drawing;
s3; forming a composite metal pipe: cutting the single-core superconducting wire obtained in the step S2 into seven equal-length wires, and putting the seven equal-length wires into the same metal pipe to form a composite metal pipe;
s4; drawing for the second time: the composite metal tube is drawn by a drawing die, and the multi-core wire is rolled into a strip with a thickness of about 0.3mm, wherein the drawing die is the drawing die in claims 1 to 5.
S4: and (3) heat treatment: the tape formed in S4 is heat-treated to form a superconducting tape.
Optionally, in the above method for preparing a superconducting tape, in step S4, the heat treatment temperature is 500 to 1000 ℃, the heat preservation time is 10 to 300min, and the heat treatment atmosphere is a vacuum atmosphere or an inert gas atmosphere.
The technical scheme of the invention has the following advantages:
1. the invention provides a drawing die, which comprises: the mould comprises a mould body, a mould core and a mould core, wherein a cavity with two open ends is formed in the axial direction of the mould body, the section of the cavity is polygonal, circular or kidney-shaped, and a multi-core composite metal pipe is suitable for being placed in the cavity; the cavity comprises a first opening and a second opening, a first slope is arranged on the die body corresponding to the first opening, and the bottom of the first slope is far away from the end face of the first opening; and a second slope surface is arranged corresponding to the second opening, and the bottom of the second slope surface is intersected with the end surface of the second opening.
In the drawing die with the structure, the cavity is arranged along the axial direction of the die body, the multi-core composite metal tube is placed in the cavity and is drawn, the cross section of the cavity is polygonal, circular or kidney-shaped, the cavity of the die can provide torsional constraint force for the multi-core composite metal tube in the drawing process, and the superconducting core in the metal tube is prevented from being twisted, so that the relative position of the superconducting core of the final strip material rolled subsequently is not changed, the stability of the performance of the superconducting strip material can be ensured, the defect that in the prior art, when the multi-core composite metal tube is drawn, the superconducting strip material is easily twisted due to the drawing die in the drawing process, but the twisting of the wire is not easily found in the drawing process due to the circular shape of the wire, but the obvious change of the relative position of the superconducting core in the multi-core composite metal tube can be found after the final strip material rolled subsequently is overcome, the performance of the twisted superconducting tape is deteriorated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a sectional view of a drawing die provided in a first embodiment of the present invention;
FIG. 2 is a top view of a drawing die provided in a first embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a prior art superconducting core after twisting;
FIG. 4 is a schematic view showing a cross-sectional structure of a superconducting core of example 2 in which no twisting occurs;
description of reference numerals:
1. a mold body; 2. a cavity;
21. a first opening; 22. a second opening;
3. a first slope surface; 4. a second slope surface;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative effort, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art.
In addition, the technical features related to the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
This embodiment has described a drawing die, this drawing die draws compound tubular metal resonator of multicore, refer to fig. 1 and fig. 2, this drawing die includes mould body 1, set up along the axial direction of this mould body 1 and be open-ended cavity 2 in both ends, and be polygon or circular or waist shape with the cross-section of cavity 2, above-mentioned cavity 2 includes first opening 21 and second opening 22, on this mould body 1, set up first domatic 3 corresponding this first opening 21, this first domatic 3 bottom is kept away from this first open-ended terminal surface setting, set up the domatic 4 of second corresponding second opening 22, the bottom of this domatic 4 of second intersects with the terminal surface of this second opening 22.
The multi-core composite metal pipe is suitable for being placed into the cavity 2 of the drawing die along the first opening 21 and the second opening 22 of the cavity 2, the drawing die with the polygonal or circular or kidney-shaped cross section of the cavity 2 is used for drawing the multi-core composite metal pipe, torsion constraint force can be provided for the multi-core composite metal pipe, and the phenomenon that a superconducting core in the metal pipe is twisted is avoided, so that the relative position of the superconducting core of a final strip material rolled subsequently is not changed, the performance stability of the superconducting strip material can be guaranteed, the drawing die is simple in structure and convenient to form.
In this embodiment, the inclination angle of the first slope 3 is smaller than the inclination angle of the second slope 4. Specifically, the inclination angle of the first slope 3 may be set to 45 °, the inclination angle of the second slope 4 may be set to 60 °, and the depth of the first slope 3 may be set to be smaller than the depth of the second slope 4.
In this embodiment, when the cross section of the cavity 2 is a polygon, the polygon may be a regular hexagon or a regular octagon, and may also be a square.
In the present embodiment, when the cross section of the cavity 2 is circular, the circular shape may be provided as an ellipse or a perfect circle.
Example 2:
this example describes a superconducting tape drawn by the drawing die of example 1, and referring to fig. 3 and 4, the superconducting tape includes at least two superconducting cores, and the superconducting cores inside the superconducting tape drawn by the drawing die of example 1 are not twisted during the drawing process, and the overall performance is stable.
Example 3:
this example describes a method for producing a superconducting tape, comprising the steps of:
s1: grinding: crushing and grinding the sintered superconducting block material into powder under the protective atmosphere;
s2: drawing for the first time: the powder ground in S1 is filled into a metal tube, and the metal tube filled with the powder is drawn for the first time to a corresponding size to form a single core superconducting wire, wherein in the step of S2 in the first drawing embodiment, the metal tube filled with the powder may be drawn for the first time to a length of 11 m.
S3; forming a composite metal pipe: cutting the single-core superconducting wire obtained in the step S2 into seven equal-length wires, and putting the seven equal-length wires into the same metal pipe to form a composite metal pipe;
s4; drawing for the second time: the composite metal pipe was drawn by using a drawing die described in example 1, and the multicore wire was rolled into a strip having a thickness of about 0.2 mm.
S4: and (3) heat treatment: the tape formed in S4 is heat-treated to form a superconducting tape.
The superconducting tape prepared by the preparation method solves the problem that the superconducting core is twisted, and the superconducting tape has stable performance.
In step S4, the temperature of the heat treatment is 500 ℃, the holding time is 10min, and the atmosphere of the heat treatment is a vacuum atmosphere.
Example 4:
this example describes a method for producing a superconducting tape, which is different from example 3 in that it comprises the steps of:
s1: grinding: crushing and grinding the sintered superconducting block material into powder under the protective atmosphere;
s2: drawing for the first time: the powder ground in S1 is filled into a metal tube, and the metal tube filled with the powder is drawn for the first time to a corresponding size to form a single core superconducting wire, wherein in the step of S2 in the first drawing embodiment, the metal tube filled with the powder may be drawn for the first time to a length of 11 m.
S3; forming a composite metal pipe: cutting the single-core superconducting wire obtained in the step S2 into seven equal-length wires, and putting the seven equal-length wires into the same metal pipe to form a composite metal pipe;
s4; drawing for the second time: the composite metal pipe was drawn by using a drawing die described in example 1, and the multicore wire was rolled into a strip having a thickness of about 0.3 mm.
S5: and (3) heat treatment: the tape formed in S4 is heat-treated to form a superconducting tape.
The superconducting tape prepared by the preparation method solves the problem that the superconducting core is twisted, and the superconducting tape has stable performance.
In step S4, the temperature of the heat treatment is 1000 ℃, the holding time is 300min, and the atmosphere of the heat treatment is an inert gas atmosphere.
Example 5:
this example describes a method for producing a superconducting tape, which is different from examples 3 and 4 in that the method comprises the steps of:
s1: grinding: crushing and grinding the sintered superconducting block material into powder under the protective atmosphere;
s2: drawing for the first time: the powder ground in S1 is filled into a metal tube, and the metal tube filled with the powder is drawn for the first time to a corresponding size to form a single core superconducting wire, wherein in the step of S2 in the first drawing embodiment, the metal tube filled with the powder may be drawn for the first time to a length of 11 m.
S3; forming a composite metal pipe: cutting the single-core superconducting wire obtained in the step S2 into seven equal-length wires, and putting the seven equal-length wires into the same metal pipe to form a composite metal pipe;
s4; drawing for the second time: the composite metal pipe was drawn by using the drawing die described in example 1, and the multicore wire was rolled into a strip having a thickness of about 0.25 mm.
S5: and (3) heat treatment: heat-treating the tape formed in S4 to form a superconducting tape;
the superconducting tape prepared by the preparation method solves the problem that the superconducting core is twisted, and the superconducting tape has stable performance.
In step S4, the temperature of the heat treatment is 750 ℃, the holding time is 155min, and the atmosphere of the heat treatment is an inert gas atmosphere.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (8)
1. A drawing die, comprising:
the mould comprises a mould body (1), wherein a cavity (2) with two open ends is formed in the axial direction of the mould body, the section of the cavity (2) is polygonal, circular or kidney-shaped, and a multi-core composite metal pipe is suitable for being placed in the cavity (2);
the cavity (2) comprises a first opening (21) and a second opening (22), a first slope surface (3) is arranged on the die body (1) corresponding to the first opening (21), and the bottom of the first slope surface (3) is far away from the end surface of the first opening; and a second slope surface (4) is arranged corresponding to the second opening (22), and the bottom of the second slope surface (4) is intersected with the end surface of the second opening (22).
2. Drawing die as claimed in claim 1, characterized in that the angle of inclination of the first ramp (3) is smaller than the angle of inclination of the second ramp (4).
3. Drawing die according to claim 1 or 2, characterised in that the polygon is a regular hexagon or a regular octagon.
4. Drawing die according to claim 1 or 2, characterised in that the circular shape is an ellipse or a perfect circle.
5. Drawing die according to any of claims 1-3, characterised in that the depth of the first ramp (3) is smaller than the depth of the second ramp (4).
6. A superconducting tape, wherein the superconducting tape is drawn by the drawing die according to any one of claims 1 to 5, and the superconducting tape comprises at least two superconducting cores.
7. A method for preparing a superconducting tape, comprising the steps of:
s1: grinding: crushing and grinding the sintered superconducting block material into powder under the protective atmosphere;
s2: drawing for the first time: filling the powder ground in the step S1 into a metal tube, and performing first drawing on the metal tube filled with the powder to a corresponding size to form a single-core superconducting wire, wherein the first drawing adopts circular drawing;
s3; forming a composite metal pipe: cutting the single-core superconducting wire obtained in the step S2 into seven equal-length wires, and putting the seven equal-length wires into the same metal pipe to form a composite metal pipe;
s4; drawing for the second time: drawing the composite metal tube by using a drawing die, and rolling the multi-core wire into a strip with the thickness of 0.2-0.4mm, wherein the drawing die is the drawing die in the claims 1-5.
S4: and (3) heat treatment: the tape formed in S4 is heat-treated to form a superconducting tape.
8. The method of manufacturing a superconducting tape according to claim 7, wherein in step S4, the heat treatment temperature is 500 to 1000 ℃, the holding time is 10 to 300min, and the heat treatment atmosphere is a vacuum atmosphere or an inert gas atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042703.5A CN114373581A (en) | 2022-01-14 | 2022-01-14 | Drawing die, superconducting strip and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042703.5A CN114373581A (en) | 2022-01-14 | 2022-01-14 | Drawing die, superconducting strip and preparation method thereof |
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| CN114373581A true CN114373581A (en) | 2022-04-19 |
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| CN202210042703.5A Pending CN114373581A (en) | 2022-01-14 | 2022-01-14 | Drawing die, superconducting strip and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110136674A1 (en) * | 2008-05-27 | 2011-06-09 | Chubu University Educational Foundation | Superconducting tape wire material and method of manufacturing same |
| CN110993184A (en) * | 2019-12-06 | 2020-04-10 | 中国科学院电工研究所 | Iron-based superconducting strip and preparation method thereof |
| CN112117051A (en) * | 2020-09-14 | 2020-12-22 | 核工业西南物理研究院 | Encapsulation strengthening method of REBCO conductor and drawing die in encapsulation |
| CN113077939A (en) * | 2021-03-29 | 2021-07-06 | 中国科学院电工研究所 | Extrusion preparation process for obtaining iron-based superconducting wire rod in single pass and product thereof |
-
2022
- 2022-01-14 CN CN202210042703.5A patent/CN114373581A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110136674A1 (en) * | 2008-05-27 | 2011-06-09 | Chubu University Educational Foundation | Superconducting tape wire material and method of manufacturing same |
| CN110993184A (en) * | 2019-12-06 | 2020-04-10 | 中国科学院电工研究所 | Iron-based superconducting strip and preparation method thereof |
| CN112117051A (en) * | 2020-09-14 | 2020-12-22 | 核工业西南物理研究院 | Encapsulation strengthening method of REBCO conductor and drawing die in encapsulation |
| CN113077939A (en) * | 2021-03-29 | 2021-07-06 | 中国科学院电工研究所 | Extrusion preparation process for obtaining iron-based superconducting wire rod in single pass and product thereof |
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