CN106782999A - A kind of superconducting joint and preparation method thereof - Google Patents
A kind of superconducting joint and preparation method thereof Download PDFInfo
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- CN106782999A CN106782999A CN201710060775.1A CN201710060775A CN106782999A CN 106782999 A CN106782999 A CN 106782999A CN 201710060775 A CN201710060775 A CN 201710060775A CN 106782999 A CN106782999 A CN 106782999A
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- superconducting line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
- H01F6/065—Feed-through bushings, terminals and joints
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/048—Superconductive coils
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Abstract
The present invention relates to a kind of superconducting joint and preparation method thereof, belong to superconducting wire interconnection technique field, include reaction container, punching press bung, MgB2Block and two MgB2Superconducting line, described reaction barrel side wall is offered for MgB2The square through hole that superconducting line is penetrated, reaction container inside bottom is provided with for MgB2The guiding draw-in groove of superconducting line positioning, described through hole is connected in reaction container inside bottom with described guiding draw-in groove；Two described MgB2Superconducting line is close to be positioned in guiding draw-in groove through through hole side by side, two MgB2The MgB of superconducting line2Superconduction inner core passes through MgB in reaction container2Block is connected；Described reaction container is suitable for reading to be provided with punching press bung.A kind of superconducting joint of superconduction connection for realizing that MgB2 superconducting wires are safe and reliable of present invention proposition and preparation method thereof, it is possible to achieve two sections of connections of MgB2 superconducting lines, connection resistance can also be made to reach magnetic resonance system stabilization, and persistently work is required.
Description
Technical field
The invention belongs to superconducting wire interconnection technique field, it is related to a kind of MgB used in without helium magnet2Superconducting coil
Superconducting joint and preparation method thereof.
Background technology
Magnesium diboride（MgB2）Superconductor was found to be in 2001, has higher facing compared to other conventional superconductors
Boundary's temperature, MgB2 is relatively low at the aspect such as material and manufacturing cost, thus be considered as get a good chance of applying magnetic resonance into
As system（MRI）The aspects such as magnet, especially without helium pattern magnetic resonance imaging system（FHeMRI）A kind of candidate's material in magnet
Material.Without helium magnet compared with liquid helium magnet, make refrigerant without liquid helium and operating ambient temperature is only controlled by refrigeration machine, so choosing
Select critical-temperature MgB2 higher more particularly suitable as superconductor.The magnetic resonance imaging system sold in the market（MRI）
Mainly use niobium titanium（NbTi）The superconducting magnet of material superconducting line coiling.Traditional NbTi superconducting lines can be by the side such as welding
Method carries out superconduction connection, and MgB2 is a kind of ceramic material of fragility, and fusing point is high, it is impossible to carry out superconduction company by conventional method
Connect.Present superconducting magnetic resonance imaging system（MRI）The liquid helium of costliness is filled with magnet（LHe）To maintain NbTi superconducting lines
The critical-temperature of 4.2K.But, constantly soaring liquid helium price and very likely short liquid helium resource, are added significantly to nothing
The demand of helium magnet.MgB2Critical-temperature be 39K, therefore it can be allowed to be worked at a temperature of up to 10K-25 K.
Meanwhile, superconducting joint quality by directly influence magnet can long-term stable operation, in magnetic field and temperature
Need to realize less than 1.3 × 10 under conditions of 15K-10The engagement resistance of Ω.
The content of the invention
The present invention is in order to solve existing MgB2Superconducting joint current capacity is not strong, and in bond process is made, due to
MgB2The fragility of itself easily causes superconducting line inner core to fracture.We are according to Mg, B and MgB2The physicochemical characteristics of superconductor,
Propose that one kind realizes MgB2The safe and reliable superconductive connecting device of superconducting wire.The present invention can realize two sections of MgB2Superconducting line
Connection, connection resistance can also be made to reach magnetic resonance system stabilization, and persistently work is required.
The technical solution adopted in the present invention is as follows：
MgB2A kind of metal and nonmetallic high-melting-point alloy material, monofilament MgB2 superconducting lines be by powder-in-tube technique technology and
In-situ process is manufactured.Using Mg, B mixed-powder as original material, it is fitted into metal tube, the composite conductor for having forged
Then it is drawn into superconducting line.
To achieve these goals, the present invention uses following technical scheme：A kind of superconducting joint, includes reaction container, punching
Pressure bung, MgB2Block and two MgB2Superconducting line, described reaction barrel side wall is offered for MgB2It is square logical that superconducting line is penetrated
Hole, reaction container inside bottom is provided with for MgB2The guiding draw-in groove of superconducting line positioning, described through hole is in reaction container inside bottom
Connected with described guiding draw-in groove and direction is consistent；Two described MgB2Superconducting line is close to be positioned at guiding through through hole side by side
In draw-in groove, two MgB2The MgB of superconducting line2Superconduction inner core passes through MgB in reaction container2Block is connected；Described reaction container is suitable for reading to be set
There is punching press bung, sealed by inserting mode between punching press bung and reaction container and coordinated.
Preferably, the height-width size of described through hole and two MgB side by side2The height-width size of superconducting line
Adaptation；Described guide card well width size and two MgB side by side2The width dimensions adaptation of superconducting line.
Preferably, the inner chamber of described reaction container is in upright cylindricality.
Preferably, being provided with elevated-temperature seal layer between described reaction container and punching press bung；Described square through hole and two
Root MgB2Elevated-temperature seal layer also is provided between superconducting line.
Preferably, described elevated-temperature seal layer is GL-900 high temperature resistants without silicone sealant material.
A kind of preparation method of superconducting joint, at least comprises the following steps：
A. using machinery（Physics）The method such as polishing or chemical attack is two MgB to be connected2One section of superconduction thread end one side
The protective metal shell material for being about 5mm is peeled off, until exposing MgB2Superconduction inner core, remainder retains, next by two strippings
From the MgB of part sheath material2Superconducting line is placed in the parallel state being brought into close contact, and exposes MgB2The contact surface of superconduction inner core
Need to be placed towards same direction；
B. by two MgB to be connected2In the high-temperature sealing material of superconducting line insertion through hole, then to be passed through side wall square logical
In the column-type cavity of hole intercalation reaction bucket, the design for reacting bottom of the barrel guide card groove can be with MgB2Superconducting line is perfect to coincide, and uses
To fix superconducting joint, superconducting joint structure is not produced in cavity and rock；
The MgB for exposing need to be ensured2The upper perforate direction of superconduction inner core contact surface orientating reaction bucket is placed, and another side ensures and reaction
Bucket upper bottom portion contact, then, carries out to encapsulant in drying oven the curing process of 15 minutes at 150 DEG C；
C. by it is ground and with manufacture MgB2Superconducting line same batch（Mg + 2B）Powder uniformly mixes, appropriate
Be coated with react barrel cavity in, and with two sections of MgB2The contact surface of superconducting line inner core is fully contacted；
The Mg powder of above-mentioned filling and the mol ratio of B powder are 1: 2, Mg powder fineness 99%, the mesh of granularity 325, amorphous B powder fineness
98.8%, granularity about 400nm, powder density is about 1.96g/cm3± 4%；
D. in order to ensure the MgB after the sintering reaction of joint2Block and original MgB2The bond strength of superconducting line inner core, then high temperature is close
Closure material is added at the top of reaction container.Using the punching press bung of suitable size, piecing devices are placed in press, vertical punching press bucket
Apply about 10T/cm on cap surface direction2（〜0.93Gpa）Pressure, keep pressure 10 minutes, make reaction container and punching press bung
Closely compacting is not released, and improves the consistency of whole device；
E. solidify 15 minutes in the drying oven by the elevated-temperature seal layer at the top of reaction container at 150 DEG C；Again by after whole compacting
Device is placed in high-purity argon（Ar）In the sintering furnace of inert protective atmosphere, rapid thermal treatment is kept for 90 minutes at 700 DEG C, is made
Mg, B powder fully react generation MgB2, just can realize two sections of MgB2The superconduction connection of superconducting line,
Above-mentioned piecing devices need to naturally cool to room temperature, whole piecing devices can be taken out from stove afterwards, obtain firm connection
MgB2Superconducting line.
Advantages of the present invention is as follows：
The present invention is by MgB2Superconducting wire is placed in the inner chamber of reaction container, and is densified joint by applying pressure, can
Influence of the ambient atmosphere to sintering reaction, and improve mechanical strength and joint consistency are effectively reduced, joint electricity is effectively reduced
Resistance, ensures that joint can be in state steady in a long-term in superconducting magnet.
The present invention will peel off the MgB of half sheath metal2Superconducting line is placed in reaction container undercut, and remaining half sheath
Metal is contacted with bottom and padded, for react mixed-powder at an upper portion thereof.Ensure that after being under pressure, former MgB2Superconducting line
Will not be fractureed because of itself fragility, it is ensured that the superconductivity of former superconducting line.
The present invention adds Mg, B mixed-powder in joint, using the relatively low melting point and MgB of Mg2Less than itself fusing point into
Phase reaction temperature, realizes Reaction Welding at a lower temperature.Apply pressure before increase contact area and reaction to greatest extent, connect
The MgB of head sintering2MgB original with superconducting line2Inner core bond strength is high, effectively reduces joint resistance, improves joint critical
Current characteristics.
Brief description of the drawings
Fig. 1 is MgB of the present invention2The sectional view of superconducting line joint device.
Fig. 2 is the profile of reaction container of the present invention.
Fig. 3 is two MgB of the present invention2Schematic diagram after superconducting line stripping sheath material.
Fig. 4 is for of the invention by MgB2Superconducting line extend into the schematic diagram in reaction container cavity.
Fig. 5 is the schematic diagram that reaction container of the present invention fills magnesium boron mixed-powder.
Fig. 6 is the schematic diagram of addition high-temperature sealing material and grafting extruding bung in the present invention.
Fig. 7 is the schematic diagram after the present invention is installed.
In figure, 1：MgB2Superconducting line；2：Elevated-temperature seal layer；3：Reaction container；4：MgB2Block；5：Punching press bung；6：Guide card
Groove；7：Through hole.
Specific embodiment
A kind of superconducting joint of the invention and preparation method thereof is described further below in conjunction with the accompanying drawings：
As shown in Figure 1 and Figure 2, a kind of superconducting joint, includes reaction container 3, punching press bung 5, MgB2Block 4 and two MgB2Superconduction
Line 1, the outer shape of the reaction container 3 is cylinder, and inside is in a upright cylindrical cavity；The described side wall of reaction container 3 is opened up
Have for MgB2The square through hole 7 that superconducting line 1 is penetrated, height-width size and two MgB side by side of through hole 72Superconducting line 1
Height-width size fit, the inside bottom of reaction container 3 is provided with for MgB2The guiding draw-in groove 6 of the positioning of superconducting line 1, the width of draw-in groove 6
Size and two MgB side by side2The width dimensions adaptation of superconducting line 1, described through hole 7 the inside bottom of reaction container 3 with it is described
Guiding draw-in groove 6 connect, and through hole 7 is consistent with draw-in groove 6 direction is oriented to, bottom flushes, smoothly transit.Two described MgB2It is super
Wire 1 is close to be positioned in guiding draw-in groove 6 through through hole 7 side by side, two MgB2The MgB of superconducting line 12Superconduction inner core is in reaction container 3
It is interior by MgB2Block 4 is connected.By inserting mode sealed suitable for reading with reaction container 3 of described punching press bung 5 is coordinated.Also, it is described
Reaction container 3 and punching press bung 5 between be provided with elevated-temperature seal layer 2；Elevated-temperature seal layer also is provided with the described inwall of square through hole 7
2.Described elevated-temperature seal layer 2 is GL-900 high temperature resistants without silicone sealant material.
A kind of preparation method of superconducting joint, the method has following operating procedure：
Step one, as shown in figure 3, using machinery（Physics）The method such as polishing or chemical attack is two MgB to be connected2Superconduction
The protective metal shell material of one section long about 5mm of thread end one side is peeled off, until exposing MgB2Superconduction inner core, remainder retains.
Next the MgB for having peeled off part sheath material by two2Superconducting line 1 is placed in the parallel state being brought into close contact, and exposes MgB2It is super
The contact surface for leading inner core need to be placed towards same direction.
Step 2, as shown in figure 4, by two MgB to be connected2In the high-temperature sealing material 2 of the insertion through hole 7 of superconducting line 1,
Passed through again in the column-type cavity of the intercalation reaction bucket 3 of side wall square through hole 7, the design that the bottom of reaction container 3 is oriented to draw-in groove 6 can
With MgB2Superconducting line is perfect to coincide, and is used to fix superconducting joint, superconducting joint structure is not produced in cavity and rocks.
Above-mentioned steps need to ensure the MgB for exposing2Perforate direction is placed on superconduction inner core contact surface orientating reaction bucket 3, separately
Simultaneously ensure to be contacted with the upper bottom portion of reaction container 3.Then, encapsulant consolidate within 15 minutes in drying oven at 150 DEG C
Change is processed.
Step 3, as shown in figure 5, by it is ground and with manufacture MgB2Superconducting line same batch（Mg + 2B）
Powder 4 uniformly mixes, and appropriate is coated with the inner chamber of reaction container 3, and is fully connect with the contact surface of two sections of inner cores of MgB2 superconducting lines 1
Touch.
The Mg powder of above-mentioned filling and the mol ratio of B powder 4 are 1: 2, Mg powder fineness 99%, and the mesh of granularity 325, amorphous B powder is thin
Degree 98.8%, granularity about 400nm, powder density is about 1.96g/cm3± 4%.
Step 4, as shown in fig. 6, in order to ensure the MgB after the sintering reaction of joint2Block 4 and original MgB2The inner core of superconducting line 1
Bond strength, then high-temperature sealing material 2 is added at the top of reaction container 3.Using the punching press bung 5 of suitable size, by joint
Device is placed in press, and about 10T/cm is applied in the vertical surface direction of punching press bung 52（〜0.93Gpa）Pressure, keep pressure
10 minutes, closely compacting was not released with punching press bung 5 to make reaction container 2, improves the consistency of whole device.
Step 5, as shown in fig. 7,15 will be solidified in elevated-temperature seal 2 drying oven at 150 DEG C of layer at the top of reaction container 3
Minute.The device after whole compacting is placed in high-purity argon again（Ar）In the sintering furnace of inert protective atmosphere, rapid thermal treatment to 700
At DEG C, and kept for 90 minutes, Mg, B powder is fully reacted generation MgB2, just can realize two sections of MgB2The superconduction connection of superconducting line 1.
Above-mentioned piecing devices need to naturally cool to room temperature, whole piecing devices can be taken out from stove afterwards, be consolidated
The MgB of connection2Superconducting line.
Above-mentioned MgB2The running temperature of superconducting joint is 4 ~ 30K.
Above-mentioned above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of superconducting joint, includes reaction container（3）, punching press bung（5）、MgB2Block（4）With two MgB2Superconducting line（1）, its
It is characterised by：Described reaction container（3）Side wall is offered for MgB2Superconducting line（1）The square through hole for penetrating（7）, reaction container
（3）Inside bottom is provided with for MgB2Superconducting line（1）The guiding draw-in groove of positioning（6）, described through hole（7）In reaction container（3）It is interior
Side bottom and described guiding draw-in groove（6）Connect and direction is consistent；Two described MgB2Superconducting line（1）It is close to side by side through logical
Hole（7）It is positioned at guiding draw-in groove（6）It is interior, two MgB2Superconducting line（1）MgB2Superconduction inner core is in reaction container（3）It is interior by MgB2
Block（4）Connection；Described reaction container（3）It is suitable for reading to be provided with punching press bung（5）, punching press bung（5）With reaction container（3）Between by insert
The mode of connecing seals cooperation.
2. a kind of superconducting joint according to claim 1, it is characterised in that：Described through hole（7）Height-width size
With two MgB side by side2Superconducting line（1）Height-width size fit；Described guiding draw-in groove（6）Width dimensions and two are simultaneously
The MgB of row2Superconducting line（1）Width dimensions adaptation.
3. a kind of superconducting joint according to claim 1 or 2, it is characterised in that：Described reaction container（3）Inner chamber be in
Upright cylindricality.
4. a kind of superconducting joint according to claim 1, it is characterised in that：Described reaction container（3）With punching press bung
（5）Between be provided with elevated-temperature seal layer（2）；Described square through hole（7）With two MgB2Superconducting line（1）Between also to be provided with high temperature close
Sealing（2）.
5. a kind of superconducting joint according to claim 4, it is characterised in that：Described elevated-temperature seal layer（2）It is GL-900
High temperature resistant is without silicone sealant material.
6. a kind of preparation method of superconducting joint, it is characterised in that：At least comprise the following steps：
A. using machinery（Physics）The method such as polishing or chemical attack is two MgB to be connected2One section long of superconduction thread end one side
The protective metal shell material of about 5mm is peeled off, until exposing MgB2Superconduction inner core, remainder retains, next by two strippings
The MgB of part sheath material2Superconducting line is placed in the parallel state being brought into close contact, and exposes MgB2The contact surface of superconduction inner core is needed
Placed towards same direction；
B. by two MgB to be connected2In the high-temperature sealing material of superconducting line insertion through hole, then passed through side wall square through hole
In the column-type cavity of intercalation reaction bucket, the design for reacting bottom of the barrel guide card groove can be with MgB2Superconducting line is perfect to coincide, and is used to
Fixed superconducting joint, makes superconducting joint structure not produced in cavity and rocks；
The MgB for exposing need to be ensured2The upper perforate direction of superconduction inner core contact surface orientating reaction bucket is placed, and another side ensures and reaction
Bucket upper bottom portion contact, then, carries out to encapsulant in drying oven the curing process of 15 minutes at 150 DEG C；
C. by it is ground and with manufacture MgB2Superconducting line same batch（Mg + 2B）Powder uniformly mixes, appropriate paving
Overlay on reaction barrel cavity in, and with two sections of MgB2The contact surface of superconducting line inner core is fully contacted；
The Mg powder of above-mentioned filling and the mol ratio of B powder are 1: 2, Mg powder fineness 99%, the mesh of granularity 325, amorphous B powder fineness
98.8%, granularity about 400nm, powder density is about 1.96g/cm3± 4%；
D. in order to ensure the MgB after the sintering reaction of joint2Block and original MgB2The bond strength of superconducting line inner core, then high temperature is close
Closure material is added at the top of reaction container, using the punching press bung of suitable size, piecing devices is placed in press, vertical punching press bucket
Apply about 10T/cm on cap surface direction2（〜0.93Gpa）Pressure, keep pressure 10 minutes, make reaction container and punching press bung
Closely compacting is not released, and improves the consistency of whole device；
E. solidify 15 minutes in the drying oven by the elevated-temperature seal layer at the top of reaction container at 150 DEG C；Again by after whole compacting
Device is placed in high-purity argon（Ar）In the sintering furnace of inert protective atmosphere, rapid thermal treatment is kept for 90 minutes at 700 DEG C, is made
Mg, B powder fully react generation MgB2, just can realize two sections of MgB2The superconduction connection of superconducting line,
Above-mentioned piecing devices need to naturally cool to room temperature, whole piecing devices can be taken out from stove afterwards, obtain firm connection
MgB2Superconducting line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710060775.1A CN106782999B (en) | 2017-01-25 | 2017-01-25 | A kind of superconducting joint and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710060775.1A CN106782999B (en) | 2017-01-25 | 2017-01-25 | A kind of superconducting joint and preparation method thereof |
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| CN106782999A true CN106782999A (en) | 2017-05-31 |
| CN106782999B CN106782999B (en) | 2018-05-04 |
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ID=58943298
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| CN108198935A (en) * | 2017-12-29 | 2018-06-22 | 中国科学院电工研究所 | A kind of magnesium diboride Josephson junction and preparation method thereof |
| CN113346259A (en) * | 2020-03-02 | 2021-09-03 | 株式会社日立制作所 | Connection part of superconducting wire and connection method of superconducting wire |
| CN114267983A (en) * | 2021-12-24 | 2022-04-01 | 中国科学院合肥物质科学研究院 | Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof |
| CN117543236A (en) * | 2023-12-07 | 2024-02-09 | 中国科学院赣江创新研究院 | Superconducting joint and preparation method thereof |
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| CN102867611A (en) * | 2012-09-11 | 2013-01-09 | 宁波健信机械有限公司 | Superconductive joint of magnesium diboride superconductive coil used under high magnetic field |
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| CN108198935A (en) * | 2017-12-29 | 2018-06-22 | 中国科学院电工研究所 | A kind of magnesium diboride Josephson junction and preparation method thereof |
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| CN114267983A (en) * | 2021-12-24 | 2022-04-01 | 中国科学院合肥物质科学研究院 | Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof |
| CN117543236A (en) * | 2023-12-07 | 2024-02-09 | 中国科学院赣江创新研究院 | Superconducting joint and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106782999B (en) | 2018-05-04 |
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