CN116844816A - Niobium three tin superconducting magnet joint - Google Patents
Niobium three tin superconducting magnet joint Download PDFInfo
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- CN116844816A CN116844816A CN202310506095.3A CN202310506095A CN116844816A CN 116844816 A CN116844816 A CN 116844816A CN 202310506095 A CN202310506095 A CN 202310506095A CN 116844816 A CN116844816 A CN 116844816A
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- 239000010955 niobium Substances 0.000 title claims abstract description 55
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 44
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 44
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims description 11
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- 238000010438 heat treatment Methods 0.000 abstract description 18
- 238000009434 installation Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000013461 design Methods 0.000 description 8
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- 229910001220 stainless steel Inorganic materials 0.000 description 5
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 2
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
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- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 1
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Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The application discloses a niobium three-tin superconducting magnet joint which comprises a superconducting magnet framework, a wire inlet joint positioning block and a wire outlet joint positioning block, wherein a wire inlet groove and a wire outlet groove are formed in the superconducting magnet framework, upper and lower notches of the wire inlet groove and the wire outlet groove are in an outwards expanded arc shape, the wire inlet joint positioning block is arranged above the wire inlet groove, and the wire outlet joint positioning block is arranged above the wire outlet groove; the wire inlet connector positioning block is provided with a first welding groove communicated with the wire inlet groove, and the wire outlet connector positioning block is provided with a second welding groove communicated with the wire outlet groove. The application has the advantages that the lower energy loss of the niobium-three-tin superconducting joint under high field can be effectively realized; in addition, the joint is simple in structure, can be integrally filled and formed in the tank body, is convenient to install, avoids brittle failure of the niobium three-tin superconducting wire caused by disassembly and assembly of the traditional joint before and after heat treatment, is lower in manufacturing and using cost, and is lower in installation and welding operation risks.
Description
Technical Field
The application relates to the technical field of superconducting magnets, in particular to a niobium-three-tin superconducting magnet joint.
Background
The efficient superconducting magnet technology and the low-temperature refrigeration technology are widely applied to national economy, scientific experiments, national defense and military industry, nuclear magnetic resonance, magnetic levitation and other scientific technologies. The superconducting technology is used as a technology almost with 0 resistance and 0 energy consumption, so that the superconducting magnet can obtain higher current and stronger magnetic field under lower voltage, and has wide application and scientific research values in the fields of integrated circuit semiconductors, biological medicines, novel materials and the like. The main reason that the current superconducting magnet cannot realize the complete 0 resistance is that the superconducting joint is a broken connection structure, and no superconducting welding material is found in the world at present, so that the superconducting joint cannot realize the 0 resistance superconducting state at 4K (-269 ℃). In this case, a low-resistance heating loss exists in the whole current loop all the time, so that the current in the loop is continuously attenuated with the increase of time.
The superconducting joint is a fixing device for connecting joints at two ends of a superconducting wire or a fixing and leading-out device in a transition section of a superconducting magnet inlet and outlet joint and an external higher temperature zone. The device has ultralow resistance, and can meet the requirements of 640 ℃ high-temperature heat treatment and 4K (-269 ℃) deep low-temperature operation of the superconducting magnet. In general superconducting coils, the heat loss of the superconducting joint occupies more than half of the total heat loss of the superconducting magnet, especially in superconducting magnet systems (such as nuclear magnetic resonance imaging, nuclear magnetic resonance spectrometer, proton accelerator and the like) running in a closed loop, but due to continuous attenuation of current, long-time stable magnetic field running cannot be realized, and power supplementing operation needs to be performed after the attenuation reaches a certain value.
Niobium trisin (Nb) 3 Sn) superconducting magnet is generally used in the technical field of higher magnetic field, and is widely applied to the magnetic field intensity of 7T and below, nb compared with the conventional niobium-titanium superconducting magnet 3 Sn superconducting magnet is generally used in the field of 7T-20T high magnetic field, and has critical magnetic field at 4.2K temperatureThe field may reach 24.5T. Nb (Nb) 3 Sn superconducting joints generally require complex tooling as an aid, in Nb 3 After the Sn coil is wound, the Sn coil is subjected to high-temperature heat treatment in a vacuum heat treatment furnace, and niobium and tin in the wire are subjected to chemical reaction to generate Nb 3 A Sn superconducting phase having superconducting characteristics, and Nb after heat treatment 3 The Sn wire is of a ceramic structure, is easy to bend and brittle fracture, brings great risks to the manufacture and transmission performance of the magnet, and is Nb 3 The Sn superconducting magnet realizes larger critical current and higher magnetic field, the transmission bottleneck is at the position of the brittle-off superconducting joint, and the design of the superconducting joint directly influences Nb 3 The performance of Sn superconducting magnet becomes a limitation of Nb 3 The development and application of Sn superconducting magnets are a bottleneck, and thus design optimization is required on superconducting joints to improve the safety and stability of the magnets.
Traditional Nb 3 The installation process of the Sn superconducting joint is generally divided into two steps, an electric lead tap outside the magnetic body is protected by using a stainless steel armor sleeve before heat treatment at 640 ℃, the stainless steel armor is removed after the heat treatment is completed, and the stainless steel armor is replaced by an oxygen-free copper armor sleeve with lower resistivity and higher heat conductivity, but because of the risk of brittle fracture after heat treatment of wires, if repeated installation, disassembly and welding position adjustment are carried out in manual operation, nb is very easy to occur 3 The ceramic core of the Sn superconducting wire tap is brittle, so that the current in unit area is greatly reduced, and the energy loss is large and even the superconducting property is lost. In order to achieve lower resistance and protect the joint as much as possible, the height of the oxygen-free copper armor sleeve which is commonly used is more than 100mm-150mm, after the superconducting coil is wound, the superconducting coil is pulled out from the tail part of the annular coil, and the direction of the superconducting wire is parallel to the axial magnetic field direction in order to avoid the electromagnetic acting force of the superconducting wire due to longer wire rod, so that the superconducting wire needs to be bent to be vertical after being pulled out, and then large-area welding is performed. Because the superconducting wire is subjected to bending stress, after heat treatment at 640 ℃, the internal stress of the wire is released, bending deformation is formed locally, and the difficulty of manual welding and disassembly operations is increased.
Disclosure of Invention
The application aims to provide a superconducting magnet joint with low loss and convenient installation.
In order to solve the technical problems, the application provides the following technical scheme:
the niobium three-tin superconducting magnet joint comprises a superconducting magnet framework, a wire inlet joint positioning block and a wire outlet joint positioning block, wherein a wire inlet groove and a wire outlet groove are formed in the superconducting magnet framework, upper and lower notches of the wire inlet groove and the wire outlet groove are in an outwards expanded arc shape, the wire inlet joint positioning block is arranged above the wire inlet groove, and the wire outlet joint positioning block is arranged above the wire outlet groove;
the wire inlet joint positioning block is provided with a first welding groove communicated with the wire inlet groove, and the first welding groove is obliquely arranged towards the tangential direction of the notch on the arc shape of the wire inlet groove, so that a niobium three-tin superconducting tap can be smoothly led out from the wire inlet groove and the first welding groove;
the wire outlet connector positioning block is provided with a second welding groove communicated with the wire outlet groove, and the second welding groove is obliquely arranged towards the tangential direction of the notch on the arc shape of the wire outlet groove, so that the niobium-three-tin superconducting tap can be smoothly led out from the wire outlet groove and the second welding groove.
Through the arrangement of the joint, the direction of the niobium three-tin superconducting tap is not changed after the niobium three-tin superconducting tap is led out, a straight-in and straight-out mode is adopted, the whole path does not need to be bent and angle adjustment, the internal bending stress of the wire is reduced, and the performance retention after heat treatment is better; meanwhile, the joint extends towards the plane direction, the sectional area of the positioning block is increased, the length of the transmission path is reduced, the resistance of the superconducting joint is reduced in the mode, a better result is obtained in the experiment, and the joint resistance can reach 10 -9 ～10 -10 The order of magnitude can avoid higher joint size, and the whole height of joint is only about 15mm, provides the possibility for the design and the installation of the small space in the superconducting magnet system, better adapts to the superconducting joint design in limited narrow space, uses different shapes to adapt to limited space in the low-temperature system on the premise of meeting parameter requirements, and can effectively realize the lower energy loss of the niobium three-tin superconducting joint under high field.
In addition, this joint simple structure can be at the internal integrative filling shaping of cell, simple to operate, has avoided traditional joint dismouting before and after the heat treatment to cause the three tin superconducting wires of niobium to take place brittle failure to this joint manufacturing, use cost are lower, and installation and welding operation risk are also lower simultaneously.
Preferably, the surface of the superconducting magnet skeleton is coated with an insulating layer.
Preferably, insulating sheets are arranged between the wire inlet connector positioning block and the wire outlet connector positioning block and the superconducting magnet framework.
Preferably, insulating cloth is arranged on the groove walls of the first welding groove and the second welding groove.
Preferably, the inlet wire joint positioning block and the outlet wire joint positioning block are both fixed on the superconducting magnet framework through fixing bolts, and the fixing bolts are sleeved with electric insulation sleeves.
Preferably, the niobium three-tin superconducting tap and the superconducting wire are integrally molded in the first welding groove and the second welding groove.
Preferably, the first welding groove and the second welding groove are filled with alloy solder with high heat conductivity and low melting point.
Preferably, the superconducting magnet skeleton, the wire inlet connector positioning block and the wire outlet connector positioning block are all made of nonmagnetic metal materials.
Preferably, the superconducting magnet further comprises an intermediate transition joint positioning block, a third welding groove which is in an X-shaped cross shape is arranged on the intermediate transition joint positioning block, a transition wire inlet groove and a transition wire outlet groove are further formed in the superconducting magnet framework, the transition wire inlet groove and the transition wire outlet groove are arranged in a splayed shape, upper and lower notches of the transition wire inlet groove and the transition wire outlet groove are in an outwards expanded arc shape, the transition wire inlet groove is communicated with one notch at the bottom of the third welding groove, the transition wire outlet groove is communicated with the other notch at the bottom of the third welding groove, and two notches at the bottom of the third welding groove are respectively obliquely arranged towards tangential directions of the arc-shaped upper notches of the transition wire inlet groove and the arc-shaped transition wire outlet groove, so that a niobium three-tin superconducting transition tap can be smoothly led out from the two notches of the third welding groove.
Preferably, insulating cover bases are further arranged on the superconducting magnet frameworks at two ends of the middle transition joint positioning block.
Compared with the prior art, the application has the beneficial effects that:
through the arrangement of the joint, the direction of the niobium three-tin superconducting tap is not changed after the niobium three-tin superconducting tap is led out, a straight-in and straight-out mode is adopted, the whole path does not need to be bent and angle adjustment, the internal bending stress of the wire is reduced, and the performance retention after heat treatment is better; meanwhile, the joint extends towards the plane direction, the sectional area of the positioning block is increased, the length of the transmission path is reduced, the resistance of the superconducting joint is reduced in the mode, a better result is obtained in the experiment, and the joint resistance can reach 10 -9 ～10 -10 The order of magnitude can avoid higher joint size, and the whole height of joint is only about 15mm, provides the possibility for the design and the installation of the small space in the superconducting magnet system, better adapts to the superconducting joint design in limited narrow space, uses different shapes to adapt to limited space in the low-temperature system on the premise of meeting parameter requirements, and can effectively realize the lower energy loss of the niobium three-tin superconducting joint under high field.
In addition, this joint simple structure can be at the internal integrative filling shaping of cell, simple to operate, has avoided traditional joint dismouting before and after the heat treatment to cause the three tin superconducting wires of niobium to take place brittle failure to this joint manufacturing, use cost are lower, and installation and welding operation risk are also lower simultaneously.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present application;
fig. 2 is a schematic diagram of another structure of an embodiment of the present application.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present application by those skilled in the art, the technical scheme of the present application will be further described with reference to the accompanying drawings.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise explicitly specified and defined. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 and 2, the present embodiment discloses a niobium-three-tin superconducting magnet joint, which is fixed on a niobium-three-tin superconducting winding 5, and comprises a superconducting magnet frame 1, an incoming wire joint positioning block 2, an outgoing wire joint positioning block 3 and an intermediate transition joint positioning block 4, wherein an insulating layer is coated on the surface of the superconducting magnet frame 1, so that the niobium-three-tin superconducting wire is electrically insulated from the superconducting magnet frame 1; the superconducting magnet framework 1 is provided with a wire inlet groove 101, a wire outlet groove 102, a transition wire inlet groove 103 and a transition wire outlet groove 104, the transition wire inlet groove 103 and the transition wire outlet groove 104 are arranged in a splayed mode, upper and lower notches of the wire inlet groove 101, the wire outlet groove 102, the transition wire inlet groove 103 and the transition wire outlet groove 104 are in an outwards-expanded arc shape, a wire inlet joint positioning block 2 is fixed above the wire inlet groove 101, a wire outlet joint positioning block 3 is fixed above the wire outlet groove 102, and an intermediate joint positioning block 4 is fixed above the transition wire inlet groove 103 and the transition wire outlet groove 104.
Further, the material of the insulating layer includes, but is not limited to, silica ceramic particles, mica flakes, or other types of insulating spray materials or electric insulating materials to realize high temperature resistance at 640 ℃ and to be able to satisfy electric insulation with the superconducting magnet frame 1.
The materials of the wire inlet connector positioning block 2, the wire outlet connector positioning block 3 and the middle transition connector positioning block 4 have higher heat resistance and structural strength, the thermal expansion coefficient is close to that of a niobium-three-tin superconducting wire, the RRR value at low temperature is between 60 and 800, the heat resistance temperature is not lower than 640 ℃, the high 4K low-temperature heat conductivity (-269 ℃) is realized, and the heat conductivity is not lower than 350W/(m.K); the inlet wire joint positioning block 2, the outlet wire joint positioning block 3 and the middle transition joint positioning block 4 have lower resistivity in a 4K temperature zone (-269 ℃), the length in the current transmission direction is not more than 30mm, and the cross section in the current transmission direction is not less than 5000mm 2 By adjusting proper height and sectional area, the theoretical resistance value at low temperature is less than or equal to 10 -10 Or lower resistance below, the actual assembly resistance is less than or equal to 10 -9 Or lower resistance below. The superconducting magnet has lower heating loss in unit time, and can meet the requirement of stable operation with low current loss of more than 10 days.
Still further, the materials of the superconducting magnet frame 1 include, but are not limited to, 304L non-magnetic stainless steel, 316L non-magnetic stainless steel, T2 red copper, TU0/TU1 high conductivity oxygen free copper, or other non-magnetic metallic materials, high strength alloy materials, and thermally conductive composites with high heat transfer efficiency.
The materials of the inlet wire joint positioning block 2, the outlet wire joint positioning block 3 and the intermediate transition joint positioning block 4 include, but are not limited to, TU00 high-conductivity oxygen-free copper, TU0 high-conductivity oxygen-free copper, TU1 high-conductivity oxygen-free copper and the like, or other non-magnetic metal materials and heat conduction composite materials with high heat transfer efficiency.
The insulating sheets 6 are arranged among the wire inlet connector positioning block 2, the wire outlet connector positioning block 3, the middle transition connector positioning block 4 and the superconducting magnet skeleton 1, further, the insulating withstand voltage value of the insulating sheets 6 is not lower than 12kV/mm, and the electrical insulation performance of the insulating sheets is not greatly changed when the insulating sheets are subjected to heat treatment at 640 ℃ and a deep low temperature 4K temperature zone (-269 ℃), and the insulating sheets 6 can comprise, but are not limited to, mica sheets, mylar sheets, aluminum oxide nano gaskets, aluminum nitride nano gaskets, polyimide films, polyester films or other types of insulating spraying materials or electrical insulating films.
Still further, the size of the insulating sheet 6 is slightly larger than the external dimensions of the incoming line connector positioning block 2, the outgoing line connector positioning block 3 and the intermediate transition connector positioning block 4, and is preferably not smaller than 2mm on one side, no crack or damage occurs in the process of processing and forming, electric insulation breakdown is avoided, the maximum number of the insulating sheet 6 is 2 sheets in the laying process, so that the superconducting connector is effectively cooled at low temperature, the contact surface thermal resistance on a heat transfer path is reduced, and the integral temperature difference of the connector is not more than 0.02K.
The inlet wire joint positioning block 2 and the outlet wire joint positioning block 3 can be manufactured into different shapes according to the space limitation in the cavity of the superconducting magnet system, and RRR values at low temperature are between 60 and 800, including but not limited to a cube block, a cuboid block, a triangular block, a trapezoid block, a cylindrical block and the like.
Furthermore, the wire inlet joint positioning block 2, the wire outlet joint positioning block 3 and the intermediate transition joint positioning block 4 are all fixed on the superconducting magnet framework 1 through fixing bolts 7, and an electric insulation sleeve (not labeled in the figure) is sleeved on the fixing bolts 7.
The wire inlet joint positioning block 2 is provided with a first welding groove 201 communicated with the wire inlet groove 101, and the first welding groove 201 is obliquely arranged towards the tangential direction of a notch on the arc shape of the wire inlet groove 101, so that the niobium three-tin superconducting tap 8 can be smoothly led out from the wire inlet groove 101 and the first welding groove 201.
The wire outlet connector positioning block 3 is provided with a second welding groove 301 communicated with the wire outlet groove 102, and the second welding groove 301 is obliquely arranged towards the tangential direction of the notch on the arc shape of the wire outlet groove 102, so that the niobium three-tin superconducting tap 8 can be smoothly led out from the wire outlet groove 102 and the second welding groove 301.
The middle transition joint positioning block 4 is provided with a third welding groove 401 in an X-shaped cross shape, the transition wire inlet groove 103 is communicated with one notch at the bottom of the third welding groove 401, the transition wire outlet groove 104 is communicated with the other notch at the bottom of the third welding groove 401, and two notches at the bottom of the third welding groove 401 are respectively obliquely arranged towards tangential directions of the upper notches of the arc shapes of the transition wire inlet groove 103 and the transition wire outlet groove 104, so that the niobium three-tin superconducting transition tap 9 can be smoothly led out from the two notches of the third welding groove 401.
The niobium three-tin superconducting tap 8 and the external superconducting wire 10 are integrally formed in a filling mode in the first welding groove 201 and the second welding groove 301, the niobium three-tin superconducting transition tap 9 and the external superconducting wire 10 are integrally formed in a filling mode in the third welding groove 401, specifically, alloy solder with high heat conductivity and low melting point is melted and then poured into the first welding groove 201, the second welding groove 301 and the third welding groove 401, the integrated filling mode is achieved, the temperature of a positioning block in the filling process is not lower than 100 ℃, the fact that the high heat conductivity and low melting point alloy solder completely fills the welding groove is guaranteed to be free of bubbles, and then natural cooling is achieved to room temperature for solidification.
In this embodiment, after the winding of the coil of the niobium three tin superconducting winding 5 is completed, the niobium three tin superconducting tap 8 enters the first welding groove 201 along the tangential direction of the notch on the arc shape of the wire inlet groove 101 and is smoothly led out, the niobium three tin superconducting tap 8 enters the second welding groove 301 along the tangential direction of the notch on the arc shape of the wire outlet groove 102 and is smoothly led out, the niobium three tin superconducting transition tap 9 is also smoothly led out from the third welding groove 401 along the installation process, the tap direction is not changed after the lead-out, a straight-in and straight-out mode is adopted, no bending and angle adjustment are needed in the whole path, the internal bending stress of the wire is reduced, and the performance retention after heat treatment is better; meanwhile, the joint extends towards the plane direction, the sectional area of the positioning block is increased, the length of the transmission path is reduced, the resistance of the superconducting joint is reduced in the mode, a better result is obtained in the experiment, and the joint resistance can reach 10 -9 ～10 -10 The order of magnitude can avoid higher joint size, and the whole height of joint is only about 15mm, provides the possibility for the design and the installation of the small space in the superconducting magnet system, better adapts to the superconducting joint design in limited narrow space, uses different shapes to adapt to limited space in the low-temperature system on the premise of meeting parameter requirements, and can effectively realize the lower energy loss of the niobium three-tin superconducting joint under high field.
Although the joint receives a certain electromagnetic force, the length of the joint is 5 times or more smaller than the original length, and according to the electromagnetic force formula f=bil (magnetic field×current×length), when the magnetic field and current are fixed, the length is reduced, and the electromagnetic force is also reduced correspondingly. Meanwhile, the length of the niobium three-tin superconducting tap 8 led out by the superconducting wire is shorter, the gradient of the electromagnetic field on the path becomes very small, so when the joint overlap length is not less than 40mm, the vertical projection length along the radial gradient direction of the magnetic induction wire is less than 3cm, according to the normal magnetic field of 10.0T@150A, the transverse electromagnetic force received by the superconducting wire is only 45N, after the superconducting wire is welded and fixed in a welding groove, the influence on the critical current is negligible,
in addition, this joint simple structure, integrative filling shaping, simple to operate has avoided traditional joint dismouting before and after the heat treatment to cause the niobium three tin superconducting wire to take place brittle failure to this joint manufacturing, use cost are lower, and installation and welding operation risk are also lower simultaneously.
Furthermore, the superconducting wire 10 is formed by connecting two wires with high copper super ratio of 0.5-1.5 mm in parallel after removing surface insulation acetal paint, and the specific parallel connection mode is to bind the two wires with high copper super ratio into a whole by using an extremely fine high-purity copper wire of 0.05mm to form the superconducting wire 10, then the superconducting wire 10 is buried in the first welding groove 201, the second welding groove 301 and the third welding groove 401, and is subjected to local spot welding with the niobium three-tin superconducting tap 8 and the niobium three-tin superconducting transition tap 9.
Still further, high thermal conductivity, low melting point alloy solders including but not limited to indium based solders, bismuth based solders, silver copper based solders, palladium based solders, and gold based solders have thermal conductivity of not less than 10W/(m·k) at 4K deep low temperature, and have adhesion strength with oxygen free copper of 10kg and less without peeling at the contact surface. The thermal conductivity of the superconducting wire 10 at 4K deep low temperature is not lower than 500W/(m.K), the RRR value is not lower than 70, and the materials of the superconducting wire 10 include, but are not limited to, nbTi/Cu superconducting wires, iron-based superconducting wires, mgB2 superconducting wires, yttrium-based strips, iron-based strips and Bi-based strips.
Insulating cloths (not shown in the figure) are arranged on the walls of the first welding groove 201, the second welding groove 301 and the third welding groove 401, so that the niobium three-tin superconducting tap 8 and the niobium three-tin superconducting transition tap 9 are prevented from being attached to the walls of the grooves when alloy welding flux is canned, and ceramic insulating cloths are adopted as the insulating cloths in the embodiment.
Furthermore, the superconducting magnet frameworks 1 at the two ends of the intermediate transition joint positioning block 4 are also provided with insulating cover bases 11 for installing insulating covers, the intermediate transition joint positioning block 4 is protected and electrically insulated from external parts, so that the structural requirement of assembling and disassembling at any time is met, and the superconducting joint can be detected and maintained; the electrical insulation compressive strength of the insulating cover base 11 at low temperature is not lower than 12kV/mm, and the materials of the insulating cover base 11 include, but are not limited to, aluminum nitride blocks/sheets, aluminum oxide blocks/sheets, epoxy resin blocks/sheets, mylar (Mylar) blocks/sheets, polyester blocks/sheets, polyimide blocks/sheets and the like, and the insulating cover base 11 has no fixing requirement on a specific structure, can be adapted according to a connector type, and can meet the insulation requirement.
Furthermore, before the joint is installed, it is necessary to clean the surfaces of the superconducting magnet frame 1, the wire inlet joint positioning block 2, the wire outlet joint positioning block 3, the intermediate transition joint positioning block 4, the niobium-three-tin superconducting tap 8 and the niobium-three-tin superconducting transition tap 9 by pickling, and prevent the acid solution from penetrating into the magnet.
The installation process of the embodiment is as follows:
firstly, fixing a wire inlet joint positioning block 2, a wire outlet joint positioning block 3 and an intermediate transition joint positioning block 4 on a superconducting magnet framework 1 through a fixing bolt 7, then smoothly leading out a niobium three-tin superconducting tap 8 after entering a first welding groove 201 along the tangential direction of a notch on the arc shape of a wire inlet groove 101, smoothly leading out the niobium three-tin superconducting tap 8 after entering a second welding groove 301 along the tangential direction of the notch on the arc shape of a wire outlet groove 102, smoothly leading out a niobium three-tin superconducting transition tap 9 after the mounting process is also carried out from a third welding groove 401, after the lead-out, the lead-out direction is not changed any more, a direct-in and direct-out mode is adopted, then ceramic insulating cloth is arranged on the groove walls of the first welding groove 201, the second welding groove 301 and the third welding groove 401, so that the niobium three-tin superconducting tap 8 and the niobium three-tin superconducting transition tap 9 cannot be attached to the groove walls, then burying a superconducting wire 10 into the first welding groove 201, the second welding groove 301 and the third welding groove 401, melting the niobium three-tin superconducting tap 8 and the niobium three-tin transition tap 9, carrying out local spot welding after the welding, and completing the melting of the high-melting point and low-melting point superconducting alloy welding after the first pouring-in the welding alloyIn the welding groove 201, the second welding groove 301 and the third welding groove 401, the integrated filling forming is carried out, the temperature of a positioning block is not lower than 100 ℃ in the filling process, the alloy solder with high heat conductivity and low melting point is ensured to be completely filled in the welding groove without bubbles, then the temperature is naturally reduced to room temperature for solidification, the insulation performance of a coil is detected by using a voltage withstanding instrument, the integral resistance value of a superconducting magnet is checked and recorded by measurement, finally, an insulating cover base 11 is installed and fixed, an insulating cover is installed, an intermediate joint positioning block 4 is protected and is electrically insulated with external parts, and thus, the low-loss Nb is completed 3 And manufacturing and installing the Sn superconducting joint.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the application, the scope of the application is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (10)
1. A niobium-three-tin superconducting magnet joint, characterized in that: the superconducting magnet comprises a superconducting magnet framework, a wire inlet joint positioning block and a wire outlet joint positioning block, wherein a wire inlet groove and a wire outlet groove are formed in the superconducting magnet framework, upper and lower notches of the wire inlet groove and the wire outlet groove are in an outwards expanded arc shape, the wire inlet joint positioning block is arranged above the wire inlet groove, and the wire outlet joint positioning block is arranged above the wire outlet groove;
the wire inlet joint positioning block is provided with a first welding groove communicated with the wire inlet groove, and the first welding groove is obliquely arranged towards the tangential direction of the notch on the arc shape of the wire inlet groove, so that a niobium three-tin superconducting tap can be smoothly led out from the wire inlet groove and the first welding groove;
the wire outlet connector positioning block is provided with a second welding groove communicated with the wire outlet groove, and the second welding groove is obliquely arranged towards the tangential direction of the notch on the arc shape of the wire outlet groove, so that the niobium-three-tin superconducting tap can be smoothly led out from the wire outlet groove and the second welding groove.
2. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: the surface of the superconducting magnet skeleton is coated with an insulating layer.
3. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: insulating sheets are arranged between the wire inlet connector positioning block and the superconducting magnet skeleton as well as between the wire outlet connector positioning block and the superconducting magnet skeleton.
4. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: insulating cloth is arranged on the groove walls of the first welding groove and the second welding groove.
5. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: the wire inlet connector positioning block and the wire outlet connector positioning block are both fixed on the superconducting magnet framework through fixing bolts, and the fixing bolts are sleeved with electric insulation sleeves.
6. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: the niobium three-tin superconducting tap and the superconducting wire are integrally filled and formed in the first welding groove and the second welding groove.
7. A niobium-three-tin superconducting magnet joint as claimed in claim 6, wherein: alloy solders with high heat conductivity and low melting point are filled in the first welding groove and the second welding groove.
8. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: the superconducting magnet framework, the wire inlet connector positioning block and the wire outlet connector positioning block are all made of nonmagnetic metal materials.
9. A niobium-three-tin superconducting magnet joint as claimed in claim 1, wherein: still include the intermediate junction locating piece, be equipped with the third welding groove that is X type cross on the intermediate junction locating piece, still be provided with transition wire inlet groove and transition wire outlet groove on the superconducting magnet skeleton, transition wire inlet groove and transition wire outlet groove are the splayed setting, the upper and lower notch of transition wire inlet groove and transition wire outlet groove is outside expanding arc form, transition wire inlet groove communicates with one of them notch in bottom of third welding groove, transition wire outlet groove communicates with another notch in bottom of third welding groove, two notches in bottom of third welding groove are respectively towards the tangential direction slope setting of the last notch of transition wire inlet groove and transition wire outlet groove arc shape, cause the three tin superconducting transition taps of niobium can follow two notches smooth outgoing of third welding groove.
10. A niobium-three-tin superconducting magnet joint as claimed in claim 9, wherein: and insulating cover bases are further arranged on the superconducting magnet frameworks at the two ends of the middle transition joint positioning block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310506095.3A CN116844816A (en) | 2023-05-05 | 2023-05-05 | Niobium three tin superconducting magnet joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310506095.3A CN116844816A (en) | 2023-05-05 | 2023-05-05 | Niobium three tin superconducting magnet joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116844816A true CN116844816A (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310506095.3A Pending CN116844816A (en) | 2023-05-05 | 2023-05-05 | Niobium three tin superconducting magnet joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116844816A (en) |
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2023
- 2023-05-05 CN CN202310506095.3A patent/CN116844816A/en active Pending
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