CN113470884A - One-generation and two-generation composite high-temperature superconducting tape - Google Patents
One-generation and two-generation composite high-temperature superconducting tape Download PDFInfo
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- CN113470884A CN113470884A CN202110794144.9A CN202110794144A CN113470884A CN 113470884 A CN113470884 A CN 113470884A CN 202110794144 A CN202110794144 A CN 202110794144A CN 113470884 A CN113470884 A CN 113470884A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention discloses a first-generation second-generation high-temperature composite superconducting tape. The high-temperature composite superconducting tape comprises a first-generation high-temperature superconducting tape and a second-generation high-temperature superconducting tape. The composite superconducting tape is prepared by filling and depositing a second-generation high-temperature superconducting coating on a first-generation high-temperature superconducting layer, and sandwiching a stabilizing layer and a buffer layer between two layers of superconducting tapes, wherein both sides of each tape are wrapped by copper stabilizing layers. The composite superconducting strip comprises a copper stabilizing layer, a silver stabilizing layer, a second-generation high-temperature superconducting layer, a substrate layer, a copper stabilizing layer, a first-generation high-temperature superconducting layer and a copper stabilizing layer from top to bottom in sequence; the superconducting tape balances the quench speeds of the first generation and the second generation, and avoids the problems of expansion of the quench range and permanent damage caused by local overheating caused by unbalanced quench speeds. The superconducting tape is in a superconducting state at the temperature of 86K, and the superconducting characteristic at the temperature of liquid nitrogen is ensured. Not only can improve the stability of the superconducting tape, but also can increase the engineering current density.
Description
Technical Field
The invention relates to the technical field of superconducting conductor application, in particular to a composite high-temperature superconducting tape.
Background
With the rapid development of the advanced scientific fields such as controlled thermonuclear reaction, high-energy accelerator and the like, the application of superconducting technology is receiving more and more attention. Over the past few decades, the first generation of high temperature superconductors, represented by BiSrCaCuO superconductors, and the second generation of high temperature superconductors, represented by YBCO and REBCO CC, that have been developed later, have greatly facilitated the development of the superconducting field.
The most important property of superconducting materials is non-resistive. When the superconducting material is at or below the critical temperature and the critical magnetic field, the superconducting material exhibits no resistance. At a critical temperature TcWhen the current applied to the superconductor is larger than IcAt this time, the superconductor will switch to its normal state. Critical current IcAs a function of temperature and magnetic field, the critical current decreases with increasing magnetic field or temperature until it becomes normal. Critical current IcAnd the value of n is two important parameters describing the superconducting properties of a superconductor.
Up to now, studies on the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape are not sufficient, among which studies on anisotropy and quench of both critical currents are not lacked. The critical current of the first and second generation high temperature superconducting tapes has magnetic field anisotropy, which is expressed in that the magnitude of the critical current changes with the direction of the magnetic field. From the comparison curve of the normalized critical current of the first generation high-temperature superconducting tape represented by BSCCO and the normalized critical current of the second generation high-temperature superconducting tape represented by REBCO under the parallel magnetic field, it can be seen that the difference between the normalized critical current and the normalized critical current is not large under the parallel magnetic field, the trend of the normalized critical current along with the change of the magnetic field is basically the same, and the critical current of the second generation high-temperature superconducting tape is slightly higher than that of the first generation high-temperature superconducting tape, but the difference is not much. In a comparison curve of the normalized critical current of the first-generation high-temperature superconducting tape represented by BSCCO and the second-generation high-temperature superconducting tape represented by REBCO under the vertical magnetic field, the curve is compared with the curve under the parallel magnetic field, and the critical current of the two is more reduced, but the basic trend is similar, and the critical current of the first-generation high-temperature superconducting tape is reduced more in the vertical magnetic field than in the second-generation high-temperature superconducting tape.
The quench propagation speed and the minimum quench energy of the two generations of high temperature superconducting tapes are obviously different. Respectively comparing the quench propagation speeds of a first-generation high-temperature superconducting tape represented by BSCCO and a second-generation high-temperature superconducting tape represented by REBCO, wherein the quench propagation speed of the first-generation high-temperature superconducting tape is smaller due to the lower n value of the first-generation high-temperature superconducting tape; and the second generation high temperature superconducting tape has a larger quench propagation speed due to its higher n value.
By analyzing the variation of the quench propagation speeds of the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape along with the normalized current, it can be found that the quench propagation speed of the first-generation high-temperature superconducting tape represented by BSCCO is smaller than that of the second-generation high-temperature superconducting tape represented by REBCO, the quench propagation speeds of the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape are increased along with the increase of the normalized current, and the growth rate of the second-generation high-temperature superconducting tape is obviously greater than that of the first-generation high-temperature superconducting tape. The minimum quench energies of the first generation high temperature superconducting tape and the second generation high temperature superconducting tape are also closely related to the normalized current. With the increase of the normalized current, the minimum quench energies of the two materials show a descending trend, but the minimum quench energies of the first generation high-temperature superconducting tape are all larger than that of the second generation high-temperature superconducting tape, which means that the first generation high-temperature superconducting tape is more stable than that of the second generation high-temperature superconducting tape. From the above comparative analysis, the first generation high temperature superconducting tape and the second generation high temperature superconducting tape have advantages and disadvantages, and the first generation and second generation composite high temperature superconducting tape can balance the quench propagation speed between the two tapes, has a larger engineering current density, and also increases the stability of the tapes.
The cooled liquid nitrogen system of the superconductor operating environment is too bulky, expensive and costly to maintain, which is a significant reason limiting superconductor development. Therefore, a technology for cooling the superconductor by using a refrigerator is developed, and the cooling mode of the refrigerator is gradually replacing the traditional liquid helium and liquid nitrogen immersion type cooling mode. However, the refrigerating machine has a cooling rate and effect inferior to the immersion type cooling, so that it is necessary to develop a superconductor having a higher margin of stability and having a suitable quench speed.
Disclosure of Invention
The invention aims to provide a composite high-temperature superconducting tape, which solves the problems of over-high speed or over-low speed and poor stability of the conventional superconducting tape.
In order to achieve the purpose, the invention provides the following scheme:
a composite high-temperature superconducting tape comprises the following components in sequence from top to bottom: the copper-silver composite material comprises a copper stabilizing layer, a silver stabilizing layer, a second-generation high-temperature superconducting layer, a transition layer, a buffer layer, a substrate layer, a copper stabilizing layer, a first-generation high-temperature superconducting layer and a copper stabilizing layer; adding a copper stabilizing layer above the first-generation high-temperature superconducting tape formed by rolling; constructing a basal layer, a buffer layer and a transition layer above the copper stabilizing layer; and coating the second generation high-temperature superconducting tape on the transition layer.
Optionally, the substrate layer is a textured structure formed by an alloy material or stainless steel.
Optionally, the buffer layer is an oxide layer with a thickness of 200-400 nm.
Alternatively, the transition layer may be a chemically stable oxide layer.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a composite high-temperature superconducting tape, which is characterized in that a substrate layer, a buffer layer and a transition layer are constructed above a copper stabilizing layer of a first-generation high-temperature superconducting layer, and then a second-generation high-temperature superconducting layer is coated. On one hand, the stability of the whole structure is increased by the multiple stable layers of the composite high-temperature superconducting tape, and meanwhile, the whole engineering current density is increased due to the connection of the two high-temperature superconducting tapes; the composite high-temperature superconducting tape balances the quench propagation speeds of the first generation and the second generation, and effectively solves the problems that the quench propagation speed is too high, the quench range is further enlarged, and the temperature is too high and the tape is burnt down.
The principle of the invention is as follows: the anisotropy trend of the critical current of the first generation high temperature superconducting tape and the second generation high temperature superconducting tape along with the change of the magnetic field is similar, and particularly, the critical current of the first generation high temperature superconducting tape and the second generation high temperature superconducting tape is almost consistent under the parallel magnetic field, so that the first generation high temperature superconducting tape and the second generation high temperature superconducting tape are welded together through a copper stabilizing layer in the vertical direction. Compared with the first generation high temperature superconducting tape, the second generation high temperature superconducting tape has larger quench propagation speed. When the quench propagation speed is high, the quench propagation speed can be easily detected to trigger the quench protection process, but the over-high quench propagation speed can easily cause the further expansion of a quench area; when the quench propagation speed is slow, heat build-up is more likely to occur, which in turn may burn the strip. Therefore, the composite high-temperature superconducting tapes connecting the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape through the stable layer between the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape can balance the quench propagation speeds of the first-generation high-temperature superconducting tape and the second-generation high-temperature superconducting tape, so that the quench propagation speeds are in a proper range.
Because the structure of the invention has three copper stabilizing layers, the stability of copper is more stable compared with other layers of the superconducting tape, so the structure of the invention has more stable structure compared with the second generation high temperature superconducting tape and the first generation high temperature superconducting tape. The present invention has even higher engineering current density owing to the connection of two high temperature superconductive tapes.
The invention utilizes the difference of the n values of the first generation high-temperature superconducting material and the second generation high-temperature superconducting material and combines the advantages of the two materials, so that the novel composite high-temperature superconducting tapes connected together have the advantages of more stability, larger through-flow capacity and balanced quench speed. The specific implementation mode is mainly as follows: when the first generation of second generation of composite high-temperature superconducting tapes normally work in a working state, because the n value of the second generation of high-temperature superconducting tapes is larger than that of the first generation of high-temperature superconducting tapes, current can firstly flow through the second generation of high-temperature superconducting tapes; when the current flowing through the second generation high temperature superconducting tape reaches a certain value (for example, approaches to critical current), the current gradually flows through the first generation high temperature superconducting tape because the n value of the first generation high temperature superconducting tape is small, so that the increase of the overall voltage of the composite high temperature superconducting tape is inhibited, and the increase of the temperature is prevented.
When the current reaches a certain value in the normal working process, small disturbance can be generated in the process of transferring the current to the first-generation high-temperature superconducting tape, the temperature of a local area can be increased, and then local area quench can occur, at the moment, the current is shunted to the first-generation high-temperature superconducting tape, so that the current on the second-generation high-temperature superconducting tape is in a safe range, the phenomenon that the quench propagation speed of the second-generation high-temperature superconducting tape is too fast to expand the quench area is prevented, and the overall dynamic stability is realized.
The quench propagation speed of the composite high-temperature superconducting tape is analyzed, and the quench propagation speed of the composite high-temperature superconducting tape is between the first generation high-temperature superconducting tape BSCCO and the second generation high-temperature superconducting tape REBCO and is within a better range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used 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 for those skilled in the art, other drawings can be obtained according to the drawings provided by the present invention without any creative effort.
FIG. 1 is a schematic structural view of an embodiment of a composite high temperature superconducting tape according to the present invention.
FIG. 2 is a schematic structural view of a first generation high temperature superconducting tape in the composite high temperature superconducting tape according to the present invention.
FIG. 3 is a schematic view showing the structure of a second-generation high-temperature superconducting tape in the composite high-temperature superconducting tape according to the present invention.
FIG. 4 is a schematic view showing a process of manufacturing a first-generation high-temperature superconducting tape by using a powder sleeve method according to the present invention.
FIG. 5 is a schematic view showing a process for coating a second-generation high-temperature superconducting tape by a metal salt deposition method according to the present invention.
FIG. 6 is a schematic diagram of a second generation of the composite high temperature superconducting tapes according to the present invention.
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.
The invention aims to provide a composite high-temperature superconducting tape, which solves the problems of too high or too low quench propagation speed and poor stability of the two conventional high-temperature superconducting tapes.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, there is shown a schematic structural view of a composite high temperature superconducting tape provided by the present invention. The composite high-temperature superconducting tape comprises a first-generation high-temperature superconducting tape 1 and a second-generation high-temperature superconducting tape 2 sharing a copper stabilizing layer with the first-generation high-temperature superconducting tape 1.
The first-generation high-temperature superconducting strip 1 sequentially comprises the following components from top to bottom: a copper stabilizer layer 10, a first-generation high-temperature superconducting layer 11, and a copper stabilizer layer 10.
The second generation high temperature superconducting tape 2 sequentially comprises from top to bottom: a copper stabilizer layer 20, a silver stabilizer layer 21, a second generation high temperature superconducting layer 22, a transition layer 23, a buffer layer 24, a base layer 25, and a copper stabilizer layer 20.
Constructing a copper stable layer 10 on the first-generation high-temperature superconducting layer 11 formed by rolling; building a base layer 25, a buffer layer 24 and a transition layer 23 above the stabilizing layer; and filling and depositing a second generation high-temperature superconducting layer 22 on the transition layer.
The transition layer 23 is generally an oxide with relatively stable chemical properties, and the main function of the transition layer is to prevent the diffusion of elements between the substrate layer 25 and the second-generation high-temperature superconducting layer 22, and also to transfer the texture.
The buffer layer 24 is made of oxide, the oxide commonly used as the buffer layer includes Y2O3, Al2O3, Gd2O3, MgO and the like, and the main functions of the buffer layer are to prevent atoms between the substrate layer 25 and the second-generation high-temperature superconducting layer 22 from inter-diffusing, reduce the coefficients of thermal expansion and cold contraction of the substrate and the superconducting layer, prevent the substrate and the superconducting layer from generating chemical reaction at high temperature, and reduce the lattice mismatch degree of the substrate and the superconducting layer.
The base layer 25 is a textured structure formed by an alloy material (such as nickel or nickel alloy) or stainless steel, and the base layer serves as a carrier and plays a supporting role.
In the composite high-temperature superconducting tape, the copper stabilizing layer and the silver stabilizing layer play a role in supporting and protecting.
The powder-in-tube (PIT) method is generally used in the first generation of high temperature superconducting strands, and the manufacturing process is shown in fig. 4. BSCCO powder is sintered in a boiler (30), then is loaded in a metal tube (Ag or Ag alloy) (31), and is drawn into a wire (32), a multicore wire (33) and a multicore filament (34). The filamentized sample is rolled into a strip (35) and subsequently heat treated (36), the rolling (35) and heat treatment (36) being performed a plurality of times to obtain a preferred orientation of the superconducting grains.
FIG. 5 is a flow chart of a second generation high temperature superconducting coating process using metal organic salt deposition (MOD) process for coating a second generation high temperature superconducting coated conductor film on a substrate Ni-W alloy strip. The BSCCO/Ni-W composite wire 37 is passed through the direction of movement of the fixed pulley 38 into the chemical agent container 39 and the heat treatment apparatus 41. The BSCCO/Ni-W composite wire 37 is soaked in a REBCO coating solution 38 in a chemical reagent container 39, and a REBCO high-temperature superconducting coating is coated on a matrix Ni-W alloy strip by using a metal organic salt deposition process. After being coated with the REBCO high-temperature superconducting coating, the BSCCO/REBCO composite high-temperature superconducting tape 42 is manufactured after being subjected to heat treatment in a heat treatment device 41, and is wound into a BSCCO/REBCO composite high-temperature superconducting tape finished product through a take-up reel 43.
Compared with the prior art, the invention has the following benefits and effects:
the invention provides a composite high-temperature superconducting tape, which is characterized in that a substrate layer, a buffer layer and a transition layer are constructed above a copper stabilizing layer of a first-generation high-temperature superconducting layer, and then a second-generation high-temperature superconducting layer is deposited by filling. On one hand, the stability of the whole structure is increased by the multiple stable layers of the composite high-temperature superconducting tape, and meanwhile, the whole engineering current density is increased due to the parallel connection of the two high-temperature superconducting tapes; the composite high-temperature superconducting tape neutralizes the quench propagation speeds of the first generation and the second generation, and effectively avoids the problems that the quench propagation speed is too high, the quench range is further enlarged, and the temperature is too high and the tape is burnt due to too low quench propagation speed.
Claims (7)
1. A composite high-temperature superconducting tape is characterized by comprising two generations of high-temperature superconducting tapes, and a connecting layer and a stabilizing layer between the two generations of high-temperature superconducting tapes.
2. The composite high temperature superconducting tape of claim 1, which comprises, from top to bottom: the copper-silver composite material comprises a copper stabilizing layer, a silver stabilizing layer, a second-generation high-temperature superconducting layer, a transition layer, a buffer layer, a basal layer, a copper stabilizing layer, a first-generation high-temperature superconducting layer and a copper stabilizing layer.
3. The composite high temperature superconducting tape of claim 2, wherein the two tapes are joined by a copper stabilizer layer.
4. The composite high temperature superconducting tape of claim 2, wherein the joined copper stabilizer layer is built on top of the first generation high temperature superconducting layer.
5. The composite high temperature superconducting tape according to claim 2, wherein the first-generation high temperature superconducting tape is manufactured by a powder sleeve method through a plurality of rolling and heat treatment.
6. The composite high temperature superconducting tape according to claim 2, wherein the second generation high temperature superconducting tape is coated by a metal salt deposition method by constructing a substrate on the joined copper stabilization layer.
7. The composite HTS conductor of claim 2, wherein said substrate layer is a textured structure of alloy material or stainless steel with a thickness of 30-70 mm; the buffer layer is an oxide layer with the thickness of 200-400 nm; the transition layer is mostly an oxide layer with stable chemical property; the thickness of the copper stabilizing layer and the silver stabilizing layer is between 2 mm and 10 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115171973A (en) * | 2022-06-30 | 2022-10-11 | 上海超导科技股份有限公司 | Copper-silver alloy reinforced superconducting tape, reinforcing method and superconducting coil |
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| CN1713311A (en) * | 2004-06-15 | 2005-12-28 | 中国科学院电工研究所 | Composite superconductive wires (bands) |
| CN202650758U (en) * | 2012-05-09 | 2013-01-02 | 湖北省电力公司电力科学研究院 | High-temperature superconductive mixed magnet for energy storage |
| US20140302997A1 (en) * | 2013-04-06 | 2014-10-09 | Makoto Takayasu | Superconducting Power Cable |
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2021
- 2021-07-14 CN CN202110794144.9A patent/CN113470884A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713311A (en) * | 2004-06-15 | 2005-12-28 | 中国科学院电工研究所 | Composite superconductive wires (bands) |
| CN202650758U (en) * | 2012-05-09 | 2013-01-02 | 湖北省电力公司电力科学研究院 | High-temperature superconductive mixed magnet for energy storage |
| US20140302997A1 (en) * | 2013-04-06 | 2014-10-09 | Makoto Takayasu | Superconducting Power Cable |
Non-Patent Citations (1)
| Title |
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| 皮伟等: "Current Distribution and AC Loss of BSCCO/REBCO Hybrid Tapes in Self-Magnetic Field", 《IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115171973A (en) * | 2022-06-30 | 2022-10-11 | 上海超导科技股份有限公司 | Copper-silver alloy reinforced superconducting tape, reinforcing method and superconducting coil |
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Application publication date: 20211001 |