CN102867611A - Superconductive joint of magnesium diboride superconductive coil used under high magnetic field - Google Patents
Superconductive joint of magnesium diboride superconductive coil used under high magnetic field Download PDFInfo
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- CN102867611A CN102867611A CN2012103350830A CN201210335083A CN102867611A CN 102867611 A CN102867611 A CN 102867611A CN 2012103350830 A CN2012103350830 A CN 2012103350830A CN 201210335083 A CN201210335083 A CN 201210335083A CN 102867611 A CN102867611 A CN 102867611A
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Abstract
The invention relates to a superconductive joint of a magnesium diboride superconductive coil used under high magnetic field. The current-carrying capability of the superconductive joint is usually lower than that of a superconductor as the crystal grains of two conductors can form weak connection in connection and are seriously influenced by an external magnetic field, and non-resistance current can be greatly reduced usually by virtue of a small magnetic field. The superconductive joint of the magnesium diboride superconductive coil used under high magnetic field comprises a superconductive shielding barrel and a superconductive shielding barrel cover which is plugged with the superconductive shielding barrel in a matching manner, a superconductive joint is arranged in the superconductive shielding barrel and connected with two ends of a magnesium diboride superconductive wire, the superconductive shielding barrel and the superconductive shielding barrel cover are produced by high-temperature superconductive block materials, the high-temperature superconductive block materials are of ReBa2Cu3O7-delta domain materials formed by adopting top seed crystal melting texture growth technology, wherein Re represents Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb or Lu; and the running temperature of the magnesium diboride superconductor ranges from 4K to 30K.
Description
Technical field
The present invention relates to a kind of superconducting joint of the MgB 2 superconductor wire circle that under the highfield, uses.
Background technology
One of fundamental characteristics of superconductor is so-called zero resistance effect, and namely when the residing ambient temperature of superconductor was lower than its critical superconducting transition temperature, superconductor will lose resistance, and this moment, the electric current in superconductor was in noenergy loss flow regime.This electric current is lossless to flow has very important meaning to electromagnet science and practical application.Electromagnet (hereinafter to be referred as magnet) with conventional conductor (for example copper or aluminium) coiling is not only bulky, also will consume a large amount of electric energy during operation.Also be because energy consumption, so that the highfield resistive magnet becomes is impossible.By comparison, very little with the magnet volume of superconductor coiling, and once can many decades operation steady in a long-term after the charging and do not need makeup energy.Along with continuous discovery and the superconductor manufacturing technology of new superconductive body constantly makes progress, superconducting magnet is obtaining more and more widely practical application and is becoming requisite technological means, for example just in the magnetic resonance imaging of extensive use, ore dressing, sewage disposal, the technology such as crystal growth all be unable to do without superconducting magnet.
In general, superconducting magnet is the solenoid coil of a superconducting line coiling, and the superconducting line of coil joins end to end, and forms the superconducting circuit of a closure, is called operation with closed ring when having supercurrent to flow therein.Because the whole superconducting circuit of superconducting magnet does not have resistance, electric current flows in magnet and does not also have obvious decay decades during operation with closed ring.This has guaranteed the long-term stable operation in magnetic field and has saved a large amount of electric energy.In superconducting magnet, superconducting joint is a very important part.Magnet need to be used superconducting joint in both cases.A kind of is in order to make superconducting coil form the closed-loop path, wire need to be joined end to end.In this case, usually will control the thermal switch superconducting line of superconducting coil and connect into, and form the wire order of connection of coil superconducting line-thermal switch superconducting line-coil superconducting line, this just needs to make two superconducting joints.The second situation is, the length of a superconducting line is made whole coil not sometimes in the winding process of superconducting coil, needs to connect other one or several superconducting line, and this just needs to make a plurality of superconducting joints.
The making quality of superconducting joint directly affects the performance of magnet.In general, the current capacity at superconducting joint place is lower than superconducting line itself, this is because the crystal grain of two wires can form so-called weak the connection when connecting, form the weak joint that connects, in the current-carrying situation, be subjected to the impact of external magnetic field very large, very little magnetic field just can make without hindrance electric current significantly descend usually.Superconducting magnet is moved at low temperatures, and in order to reduce to greatest extent unnecessary energy loss, hold the low-temperature (low temperature) vessel of superconducting magnet and usually all make very compactly, so the placement location of superconducting joint more options more not, have to be placed in the magnetic field.At this moment, only have magnetic field shielding is fallen, superconducting joint could work.
Summary of the invention
The technical problem that one, will solve
Magnesium diboride (MgB
2) be a kind of new superconduction material of the invention beginning of this century, can be operated in absolute temperature 4K in the temperature range of 39K, compare with conventional superconductor, the working temperature of mgb 2 superconductor is high, can provide operational environment with the conduction cooling easily, this can exempt the use liquid helium and make cold-producing medium, is conducive to superconducting magnet in the application of remote districts, for example MR imaging apparatus is the practical superconductor of the next generation very likely the popularizing of rural area.Whether compare with conventional superconductor, the superconduction coherence length of magnesium diboride is shorter, more easily forms weak the connection, so magnetic screen is particularly important to the magnesium diboride joint, is directly connected to coil and can works.The exploitation of MgB 2 superconductor wire material has had very large progress through the effort of more than ten years, and the wire rod commercialization of several kilometers length is success, and its current capacity is near the level of conventional cryogenic superconductor.Magnesium diboride does not obtain large-scale application at present, and very large reason is that the current capacity of superconducting joint does not pass a test.
Two, technical scheme
For solving the problems of the technologies described above, the superconducting joint of the MgB 2 superconductor wire circle that the present invention uses under the highfield, include the superconducting shielding bucket and be mated the superconducting shielding bung of use, be provided with superconducting joint in the above-mentioned superconducting shielding device, wherein, above-mentioned superconducting joint has connected the two ends of a MgB 2 superconductor wire, and above-mentioned superconducting shielding bucket and superconducting shielding bung are made by high-temperature superconducting block, and above-mentioned high-temperature superconducting block adopts the ReBa of top seed crystal Melt-Textured Growth Process machine-shaping
2Cu
3O
7-δFarmland material, its Re are Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb or Lu; The operating temperature of above-mentioned MgB 2 superconductor wire is 4 ~ 30K.
As optimization, above-mentioned MgB 2 superconductor wire at the resistance of 4 ~ 30K temperature range operation less than 10
-11Ohm.
Above-mentioned high-temperature superconducting block is gang's rare earth-barium-Cu oxide ReBa
2Cu
3O
7-δ(Re represents rare-earth elements of lanthanum (La), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), yttrium (Y)), with top seed crystal Melt-Textured Growth Process it is prepared into the bulk on single domain or several farmlands.
The technical process of the standby high-temperature superconducting block of top seed crystal melting texture legal system is as follows, with YBa
2Cu
3O
7-δBe example: prepare block superconductor YBa with the conventional ceramic sintering process first
2Cu
3O
7-δ, place again one or several seed crystals (such as magnesium oxide) at the sample top, sample is heated to 1010 ° of peritectic reaction temperature more than the C, high-temperature superconducting block is reacted:
YBa
2Cu
3O
6.5→ Y
2BaCuO
5+ (solid phase)+liquid phase
YBa
2Cu
3O
6.5After decomposing fully mutually, make its Slow cooling in the temperature field of gradient is arranged, at this moment solid-state Y
2BaCuO
5Particle and rich Ba-Cu-O liquid phase generation peritectic reaction regenerate the YBa of texture
2Cu
3O
6.5Phase:
Y
2BaCuO
5(solid phase)+liquid phase → YBa
2Cxu
3O
6.5
YBa
2Cu
3O
6.5Be the Tetragonal of semiconductor property, need to about 450 ° of C, heat oxygen uptake and process, could change at last the quadrature phase YBa of superconduction into
2Cu
3O
7-δ
Three, beneficial effect of the present invention
Magnesium diboride is compared with the oxide high-temperature superconductor has four large advantages: at first, oxide high-temperature superconductor, particularly second generation belt material of high temperature superconduct, the timetable of its practical application is uncertain, the technical maturation that also is far from.Secondly, the oxide high-temperature superconductor is typical ceramic material, and brittle failure easily occurs, and the welding of ceramic material also is a very large problem simultaneously.Superconducting coil normally uses under the closed-loop case, accomplish closed loop by welding, and magnesium diboride is more much easier than oxide high-temperature superconductor.The 3rd, the current attenuation speed of mgb 2 superconductor is more much smaller than oxide high-temperature superconductor, therefore is adapted at using under the closed circuit constant current mode.The 4th, magnesium diboride is cheap, estimates that the superconducting line price of 1000 amperes of carryings only is 2 ~ 3 dollars/meter, and is also more cheap than common copper conductor, is that Y-Ba-Cu-O coating conductor is incomparable.
The MgB 2 superconductor wire circle can move about the 20K temperature, only need use the refrigeration machine refrigeration of small inexpensive just can keep operating temperature.This will use expensive liquid helium so that system can save, and operation is also simplified greatly.For example, the NMR (Nuclear Magnetic Resonance) imaging device that much only has minority hospital to use can be loaded onto automobile, makes fixture become mobile unit, transfers to like a cork remote districts and gives medical treatment to a patient, and market effect and social effect all will be huge.
Description of drawings
Fig. 1 is that the present invention is with the three-dimensional cutaway view of the superconducting joint of superconducting shielding bucket;
Fig. 2 is the profile that the present invention is installed in the superconducting joint in the superconducting shielding bucket.
Among the figure, 1 is the superconducting shielding bucket, and 2 is the superconducting shielding bung, and 3 is superconducting joint, and 4 is MgB 2 superconductor wire, and 5 are the superconduction briquetting, and 6 is stopper.
Embodiment
The superconducting joint 3 of the MgB 2 superconductor wire circle that the present invention is used under the highfield below in conjunction with accompanying drawing is described further:
Execution mode one: as shown in Figure 1, the superconducting joint 3 of a kind of MgB 2 superconductor wire circle that under the highfield, uses of the present invention, include superconducting shielding bucket 1 and be mated the superconducting shielding bung 2 of grafting, be provided with superconducting joint 3 in the above-mentioned superconducting shielding bucket 1, wherein, above-mentioned superconducting joint 3 has connected the two ends of a MgB 2 superconductor wire 4, above-mentioned superconducting shielding bucket 1 and superconducting shielding bung 2 are made by high-temperature superconducting block, and it is ReBa that above-mentioned high-temperature superconducting block adopts top seed crystal Melt-Textured Growth Process machine-shaping
2Cu
3O
7-δFarmland material, its Re are Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb or Lu; The operating temperature of above-mentioned MgB 2 superconductor wire 4 is 4 ~ 30K.The quantity on above-mentioned farmland can be one, also can be several (that is, being less than ten).
The present embodiment Re is Y, and its chemical formula is YBa
2Cu
3O
7-δ, the quantity on its farmland is one.Use YBa
2Cu
3O
7-δBulk is made superconducting shielding bucket 1, and its external shape is cylindrical.According to the concrete size of superconducting joint 3, adopt the method for machining, process a cavity that is used for holding superconducting joint 3, the superconducting shielding bung 2 of pegging graft in the end of superconducting shielding bucket 1 at superconducting shielding bucket 1.Above-mentioned superconducting joint 3 comprises the shell that a cylindrical hollow copper or stainless steel are made, an end face of shell is passed at the two ends of above-mentioned MgB 2 superconductor wire 4, extend in the shell, end face at shell has through hole, enclosure is filled with the MgB2 powder, stopper 6 is shell seal, and the termination that extend into the MgB 2 superconductor wire 4 in the shell has been removed outside metal jacket layer, makes fuse and the powder MgB of MgB 2 superconductor wire 4
2Close contact makes to form the superconduction path.Be provided with a superconduction briquetting with the same material of superconducting shielding bucket at an end of superconducting joint 3, and compress by superconducting shielding bung 2.Simultaneously, fill with bismuth slicker solder cadmium solder in slit between superconducting joint 3 and the housing bucket, in order to fixing superconducting joint 3, superconducting structure can not produced in cavity rock.
After testing, superconducting shielding bucket 1 moves between absolute temperature 4K ~ 30K, and at this warm area, the magnetic field of conductively-closed is greater than 5 teslas, and superconducting shielding bucket 1 interior leakage field is that 2.0 millis are special, and operation resistance is 10
-11Ohm.
Execution mode two: the present embodiment and execution mode one are basic identical, and difference is: the present embodiment ReBa
2Cu
3O
7-δBe specially GdBa
2Cu
3O
7-δ, the quantity on its farmland is four.After testing, superconducting shielding bucket 1 moves between absolute temperature 4K ~ 30K, and greater than 5 teslas, superconducting shielding bucket 1 interior leakage field is that 1.0 millis are special in the magnetic field of this warm area conductively-closed, and operation resistance is 10
-12Ohm.
Execution mode three: the present embodiment and execution mode two are basic identical, and difference is: the present embodiment ReBa
2Cu
3O
7-δBe specially NbBa
2Cu
3O
7-δ, the quantity on its farmland is four.After testing, superconducting shielding bucket 1 moves between absolute temperature 4K ~ 30K, and greater than 5 teslas, superconducting shielding bucket 1 interior leakage field is that 1.5 millis are special in the magnetic field of this warm area conductively-closed, and operation resistance is 10
-12Ohm.
Execution mode four: the present embodiment and execution mode two are basic identical, and difference is: the present embodiment ReBa
2Cu
3O
7-δBe specially HoBa
2Cu
3O
7-δ, the quantity on its farmland is four.After testing, superconducting shielding bucket 1 moves between absolute temperature 4K ~ 30K, and greater than 5 teslas, superconducting shielding bucket 1 interior leakage field is that 1.5 millis are special in the magnetic field of this warm area conductively-closed, and operation resistance is 10
-12Ohm.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. the superconducting joint of a MgB 2 superconductor wire circle that under the highfield, uses, comprise the superconducting shielding bucket and be mated the superconducting shielding bung of grafting, be provided with superconducting joint in the described superconducting shielding bucket, it is characterized in that: described superconducting joint connects the two ends of a MgB 2 superconductor wire, described superconducting shielding bucket and superconducting shielding bung are made by high-temperature superconducting block, and described high-temperature superconducting block is the ReBa that adopts top seed crystal Melt-Textured Growth Process machine-shaping
2Cu
3O
7-δFarmland material, Re represent Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb or Lu; The operating temperature of described MgB 2 superconductor wire is 4 ~ 30K.
2. the superconducting joint of the MgB 2 superconductor wire circle that uses under the highfield according to claim 1 is characterized in that: described MgB 2 superconductor wire at the resistance of 4 ~ 30K temperature range operation less than 10
-11Ohm.
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|---|---|---|---|
| CN2012103350830A CN102867611A (en) | 2012-09-11 | 2012-09-11 | Superconductive joint of magnesium diboride superconductive coil used under high magnetic field |
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|---|---|---|---|
| CN2012103350830A CN102867611A (en) | 2012-09-11 | 2012-09-11 | Superconductive joint of magnesium diboride superconductive coil used under high magnetic field |
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|---|---|
| CN102867611A true CN102867611A (en) | 2013-01-09 |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337333A (en) * | 2013-05-27 | 2013-10-02 | 西部超导材料科技股份有限公司 | Nb3A1 superconductive connector and manufacturing method thereof |
| CN106782999A (en) * | 2017-01-25 | 2017-05-31 | 杭州图锐科技有限公司 | A kind of superconducting joint and preparation method thereof |
| CN109785990A (en) * | 2019-03-14 | 2019-05-21 | 东北大学 | A kind of superconducting tape or wire rod applied to high-intensity magnetic field |
| CN113036470A (en) * | 2021-03-17 | 2021-06-25 | 西部超导材料科技股份有限公司 | MgB2Superconducting cable joint and method for producing and connecting same |
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| CN202871445U (en) * | 2012-09-11 | 2013-04-10 | 宁波健信机械有限公司 | Superconduction joint of magnesium diboride superconducting coil used in highfield |
-
2012
- 2012-09-11 CN CN2012103350830A patent/CN102867611A/en active Pending
Patent Citations (5)
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| DE3413167A1 (en) * | 1984-04-07 | 1985-10-17 | Vacuumschmelze Gmbh, 6450 Hanau | Method for fabricating a superconducting contact |
| US20030051901A1 (en) * | 2001-07-10 | 2003-03-20 | Hitachi, Ltd. | Superconductor connection structure |
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Non-Patent Citations (1)
| Title |
|---|
| 武晓亮: "GdBa2Cu3O7-δ超导体的研制", 《陕西师范大学硕士学位论文》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337333A (en) * | 2013-05-27 | 2013-10-02 | 西部超导材料科技股份有限公司 | Nb3A1 superconductive connector and manufacturing method thereof |
| CN103337333B (en) * | 2013-05-27 | 2015-10-28 | 西部超导材料科技股份有限公司 | Nb 3al superconducting joint and preparation method thereof |
| CN106782999A (en) * | 2017-01-25 | 2017-05-31 | 杭州图锐科技有限公司 | A kind of superconducting joint and preparation method thereof |
| CN106782999B (en) * | 2017-01-25 | 2018-05-04 | 杭州图锐科技有限公司 | A kind of superconducting joint and preparation method thereof |
| CN109785990A (en) * | 2019-03-14 | 2019-05-21 | 东北大学 | A kind of superconducting tape or wire rod applied to high-intensity magnetic field |
| CN109785990B (en) * | 2019-03-14 | 2020-05-05 | 东北大学 | Application of rare earth barium copper oxide material in preparation of high-intensity magnetic field superconducting strip or wire |
| CN113036470A (en) * | 2021-03-17 | 2021-06-25 | 西部超导材料科技股份有限公司 | MgB2Superconducting cable joint and method for producing and connecting same |
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Application publication date: 20130109 |