CN117476356A - Rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and manufacturing method thereof - Google Patents
Rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and manufacturing method thereof Download PDFInfo
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- CN117476356A CN117476356A CN202311619478.8A CN202311619478A CN117476356A CN 117476356 A CN117476356 A CN 117476356A CN 202311619478 A CN202311619478 A CN 202311619478A CN 117476356 A CN117476356 A CN 117476356A
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- barium copper
- earth barium
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- FFWQPZCNBYQCBT-UHFFFAOYSA-N barium;oxocopper Chemical compound [Ba].[Cu]=O FFWQPZCNBYQCBT-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 118
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 230000032798 delamination Effects 0.000 title claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 134
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- 229910052802 copper Inorganic materials 0.000 claims description 16
- 239000010949 copper Substances 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 229910000679 solder Inorganic materials 0.000 claims description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
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- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
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- 239000004793 Polystyrene Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims description 3
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 3
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 4
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- 239000004264 Petrolatum Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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Classifications
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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
-
- 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
- H01F41/06—Coil winding
-
- 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
- H01F41/06—Coil winding
- H01F41/071—Winding coils of special form
-
- 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
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
-
- 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
-
- 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
- H01F41/06—Coil winding
- H01F41/071—Winding coils of special form
- H01F2041/0711—Winding saddle or deflection coils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention provides a rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: (1) Coating a release agent layer on the surface of the rare earth barium copper oxygen superconducting coating conductor, and winding the rare earth barium copper oxygen superconducting coating conductor coated with the release agent layer to form a rare earth barium copper oxygen high-temperature superconducting coil in a target shape; (2) And (3) curing the epoxy resin of the wound rare earth barium copper oxygen high-temperature superconducting coil. According to the invention, the release agent layer is coated on the surface of the rare earth barium copper oxygen superconducting coating conductor, so that the binding force between the epoxy resin and the surface of the rare earth barium copper oxygen superconducting coating conductor can be greatly reduced, the delamination phenomenon caused by overlarge normal stress on the surface of the coating conductor due to different thermal expansion coefficients of materials in the temperature change process is prevented, the rare earth barium copper oxygen superconducting coating conductor is further protected, and the stability of the rare earth barium copper oxygen high-temperature superconducting coil is improved.
Description
Technical Field
The invention belongs to the technical field of manufacturing of high-temperature superconducting coil magnets, and particularly relates to a rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and a manufacturing method thereof.
Background
The rare earth barium copper oxygen superconducting coating conductor has extremely high upper critical field, and is made by adopting a coating technology based on rare earth barium copper oxygen materials, thus being an ideal material for manufacturing high magnetic field magnets. The coated conductor is a multi-layer composite structure, and the layers are made of heterogeneous materials and are connected through intermolecular forces, so that the bonding strength between the layers is low. There are many cases that the rare earth barium copper oxide coated conductor is extremely easy to delaminate when being subjected to the tensile force in the direction perpendicular to the surface of the conductor, so that the critical current performance of the conductor is irreversibly reduced.
The superconducting coil is formed by winding a superconducting wire in a certain mode, and is generally of a multi-turn structure. In order to improve mechanical stability and thermal stability, in the conventional manufacturing process, the superconducting coil is generally manufactured by adopting an epoxy resin vacuum pressure impregnation (Vacuum Pressure Impregnation, VPI), and gaps between the superconducting wires are filled by utilizing fluidity of the epoxy resin before curing, and a strong binding force is formed between the cured resin and the superconducting wires, so that the superconducting wires are fixed. For NbTi, nb 3 Sn、Nb 3 Al、Bi-2223/Ag、Bi-2212/Ag、MgB 2 Or an iron-based wire, is a common process for vacuum pressure impregnation of epoxy resins. However, for the high-temperature superconducting coil made of the rare earth barium copper oxygen coated conductor, the shrinkage rate of the epoxy resin at low temperature is obviously different from that of each layer in the rare earth barium copper oxygen coated conductor, and the difference can lead to that the coated conductor is subjected to tensile stress perpendicular to the surface of a strip or shear stress at the edge of the coated conductor in the cooling process of the rare earth barium copper oxygen high-temperature superconducting coil, so that delamination of the coated conductor is induced, and the rare earth barium copper oxygen coated conductor coil is irreversibly damaged. The coil is impregnated with a material of low strength such as paraffin, without using an epoxy resin, or without impregnating the coil, so that delamination can be avoided. The conductors in the superconducting coils using this fabrication process may move under strong magnetic fields or mechanical disturbances to induce quench. So thatEpoxy impregnation is still the preferred manufacturing process for superconducting coils or magnets made of rare earth barium copper oxygen coated conductors.
The problems of delamination of the rare earth barium copper oxygen superconducting coating conductor after epoxy resin impregnation are solved by three technical approaches: (1) The bonding force or the overall strength between inner layers of the rare earth barium copper oxygen coating conductor is enhanced; (2) The thermal expansion and contraction rate of the epoxy resin is adjusted to be similar to that of the coated conductor; (3) Reducing the bonding force between the coated conductor surface and the impregnating resin or reducing the strength of the resin.
(1) The binding force between the buffer layer and the rare earth barium copper oxygen superconducting layer, the rare earth barium copper oxygen superconducting layer and the silver plating/copper plating layer can be improved by improving the preparation process of the coated conductor, but the technical means can not change the situation that the buffer layer and the superconducting layer are combined only through intermolecular acting force, the improvement degree is limited, and the side effect of reducing the critical current density can be brought. Copper or stainless steel strips are coated on two sides of the coated conductor, and the whole strength of the coated conductor can be improved by using soldering tin for whole encapsulation. However, the whole thickness of the encapsulated coated conductor is increased, the engineering current density is reduced, and the application occasions in the high-field magnet are limited.
(2) Epoxy resins are organic, and epoxy resins suitable for low temperature environments typically have a cold shrink rate of greater than 1% from room temperature to low temperatures (77K or even lower), while rare earth barium copper oxide coated conductors typically have an overall cold shrink rate of between 0.2% and 0.3%. The non-metallic powder or fiber is mixed into the epoxy resin in a certain proportion, so that the integral cold shrinkage rate of the epoxy resin can be changed, and the thermal stress to which the coated conductor is subjected is reduced. However, the overall strength and viscosity of the modified epoxy resin may change to some extent, and it has been reported in the literature that delamination may still occur in rare earth barium copper oxygen high temperature superconducting coils impregnated with doped epoxy resins.
(3) The reduction of the binding force between the resin and the coated conductor can be achieved by increasing the intermediate substance. The Japanese institute of physicochemical technology has proposed a method of plating a polyimide on the surface of a rare earth barium copper oxide coated conductor (JP 5924836B2, EP2587493B1, US9183970B 2), the polyimide plating insulating the coated conductor from the epoxy resin. When the resin is contracted at low temperature, the thermal stress acts on the polyimide coating to cause plastic deformation, so that the thermal stress transferred to the coated conductor is weakened, and the purpose of avoiding delamination is achieved. However, this technique is difficult to implement and it still involves a risk of delamination.
Disclosure of Invention
In view of the above, the present invention is to provide a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination and a manufacturing method thereof, which can prevent delamination phenomenon after epoxy resin impregnation of a coil wound by a rare earth barium copper oxygen superconducting coated conductor, thereby improving stability of the rare earth barium copper oxygen high temperature superconducting coil.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
on one hand, the embodiment of the invention provides a manufacturing method of a rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination, which comprises the following steps:
(1) Coating a release agent layer on the surface of a rare earth barium copper oxygen superconducting coating conductor, and winding the rare earth barium copper oxygen superconducting coating conductor coated with the release agent layer to form a rare earth barium copper oxygen high-temperature superconducting coil in a target shape;
(2) And (3) performing epoxy resin curing on the wound rare earth barium copper oxygen high-temperature superconducting coil.
According to the embodiment of the invention, the surface energy and the contact angle of the metal surface of the superconducting coating conductor are changed by coating the release agent layer on the surface of the rare earth barium copper oxygen superconducting coating conductor, the wettability of epoxy resin and the surface of the superconducting coating conductor is reduced, the binding force between the epoxy resin and the metal surface of the superconducting coating conductor is greatly reduced after the epoxy resin is solidified, the surface of the superconducting coating conductor and the epoxy resin are separated under extremely low stress after the epoxy resin is cooled, and the transmission of the shrinkage thermal stress of the epoxy resin to the coating conductor is blocked, so that the coating conductor is protected, the phenomenon of delamination degradation of a superconducting coil is avoided, and the stability, reliability and economy of the rare earth barium copper oxygen high-temperature superconducting coil are improved; the manufacturing method is simple in process, easy to implement, good in repeatability and high in success rate.
In some embodiments, when the winding adopts a dry winding process, vacuum pressure impregnation is performed on the rare earth barium copper oxygen high-temperature superconducting coil obtained after winding by using epoxy resin;
when the winding adopts a wet winding process, epoxy resin is coated on the surface of the rare earth barium copper oxygen superconducting coating conductor in the winding process of the rare earth barium copper oxygen superconducting coating conductor.
In some embodiments, the rare earth barium copper oxygen superconducting coated conductor includes, but is not limited to, at least one of a coated conductor with copper plated surfaces, a coated conductor with copper tape on the upper and lower surfaces encapsulated by solder, or a coated conductor with stainless steel tape on the upper and lower surfaces encapsulated by solder.
In some embodiments, the release agent layer has a layer thickness of 1nm to 1mm.
In some embodiments, the release agent in the release agent layer includes, but is not limited to, at least one of polytetrafluoroethylene, polyethylene, polyisobutylene, perchloroethylene, polyvinyl alcohol, polystyrene, polyvinyl acetal, polydimethylsiloxane, fluororesin, fluorosilicone release agent, paraffin wax, petrolatum, polyethylene wax, polyethylene glycol, glycerin, polyimide.
In some embodiments, the surface of the rare earth barium copper oxygen superconducting coated conductor comprises two broad faces and two side faces of the coated conductor, wherein the broad face where the superconducting layer is located is an upper surface, and the broad face where the base layer is located is a lower surface; the release agent coated surface may comprise any combination of the four surfaces described above.
In some embodiments, the means for applying includes, but is not limited to, at least one of direct manual application using a tooling, or manual application with a tooling after heating the release agent, or spraying from a spray head after dissolving the release agent in a solvent, or spraying from a spray head after heating the release agent.
In some embodiments, the epoxy resin is identified by a brand number including, but not limited to Stycast 2850 TM 、Stycast 1266 TM At least one of DW-3, CTD-101K, araldite CY5538, IR3, CR 2.
In some embodiments, the target shape of the rare earth barium copper oxygen high temperature superconducting coil includes, but is not limited to, at least one of a round coil, a D-coil, a racetrack coil, a saddle coil, a single pancake coil, a double pancake coil, a solenoid coil, a layer wound coil.
In some embodiments, the temperature of the curing is from 0 ℃ to 200 ℃.
The embodiment of the invention also provides a rare earth barium copper oxygen high-temperature superconducting coil, which is prepared by the manufacturing method.
The rare earth barium copper oxygen high-temperature superconducting coil provided by the embodiment of the invention can avoid the phenomenon of delamination and degradation after being impregnated with epoxy resin, and has good stability and reliability.
Drawings
FIG. 1 is a process flow diagram of a method for fabricating a rare earth barium copper oxygen high temperature superconducting coil that avoids delamination in accordance with an embodiment of the present invention.
FIG. 2 is a schematic diagram of a tooling design for coating a liquid release agent on the surface of a rare earth barium copper oxygen superconducting coated conductor in a manufacturing method according to an embodiment of the invention.
Fig. 3 is a schematic cross-sectional structure of a rare earth barium copper oxygen superconducting coated conductor coated with a release agent layer on four surfaces thereof, and cured by vacuum pressure impregnation with an epoxy resin, in the manufacturing method of the embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of a rare earth barium copper oxygen superconducting coated conductor having only a copper plating layer but no encapsulation layer in the manufacturing method of the embodiment of the present invention, after three surfaces other than the lower surface are coated with a release agent layer and cured by vacuum pressure impregnation with an epoxy resin.
Fig. 5 is a schematic cross-sectional structure of a rare earth barium copper oxygen superconducting coated conductor having only a copper plating layer but no encapsulation layer, which is coated with a release agent layer on the upper surface and impregnated with epoxy resin under vacuum pressure for curing, in the manufacturing method of the embodiment of the present invention.
Fig. 6 is a schematic cross-sectional structure of a rare earth barium copper oxide coated conductor having both a copper plating layer and an encapsulation layer, coated with a release agent layer and cured by vacuum pressure impregnation with an epoxy resin, in a manufacturing method according to an embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view of a rare earth barium copper oxide coated conductor having both a copper plating layer and an encapsulation layer in which a release agent layer is applied to three other surfaces except the lower surface and cured by vacuum pressure impregnation with an epoxy resin in the manufacturing method according to the embodiment of the present invention.
Fig. 8 is a schematic cross-sectional view of a rare earth barium copper oxygen superconducting coated conductor having only a copper plating layer but no encapsulation layer, coated with a release agent on the upper surface thereof and cured by vacuum pressure impregnation with an epoxy resin in the manufacturing method of the embodiment of the present invention.
Fig. 9 is a schematic cross-sectional view of a high-temperature superconducting coil wound by a rare earth barium copper oxygen superconducting coated conductor coated with release agent layers on four sides, after vacuum pressure impregnation and curing of epoxy resin, in the manufacturing method of the embodiment of the invention.
Fig. 10 is a schematic diagram of a cross-sectional structure of a rare earth barium copper oxygen superconducting coated conductor wound by using a release agent layer coated on three surfaces except the lower surface after vacuum pressure impregnation and curing of epoxy resin in the manufacturing method of the embodiment of the invention.
Fig. 11 is a schematic diagram showing a cross-sectional structure of a rare earth barium copper oxygen superconducting coated conductor wound by using a release agent layer coated on the upper surface thereof after vacuum pressure impregnation and curing of an epoxy resin in the manufacturing method of the embodiment of the present invention.
Reference numerals: 1-rare earth barium copper oxygen superconducting coating conductor; 2-a release agent layer; a 3-epoxy resin layer; 4-a compression wheel; 5-coating wheel; 6-a release agent storage tank;
a base layer within the 101-rare earth barium copper oxygen superconducting coating conductor; a buffer layer within the 102-rare earth barium copper oxygen superconducting coating conductor; 103-a superconducting layer within the rare earth barium copper oxygen superconducting coating conductor; 104-copper plating layer in the rare earth barium copper oxygen superconducting coating conductor; a packaging layer in the 105-rare earth barium copper oxygen superconducting coating conductor; 106-a solder layer in the rare earth barium copper oxygen superconducting coating conductor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without creative efforts, based on the described embodiments of the present invention belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Where a value is described herein as a range, it is understood that such disclosure includes disclosure of all possible sub-ranges within the range, as well as specific values falling within the range, regardless of whether the specific value or sub-range is explicitly recited.
In this document, the words "comprise" and "comprising" and their various variants are intended to mean that other elements or integers may be included that allow for but not specifically described.
As shown in FIG. 1, in one aspect, the present invention provides a method for manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination, comprising the following steps:
(1) Coating a release agent layer on the surface of the rare earth barium copper oxygen superconducting coating conductor, and winding the rare earth barium copper oxygen superconducting coating conductor coated with the release agent layer to form a rare earth barium copper oxygen high-temperature superconducting coil in a target shape;
(2) And (3) curing the epoxy resin of the wound rare earth barium copper oxygen high-temperature superconducting coil.
The high-temperature superconducting coil wound by the rare earth barium copper oxygen superconducting coating conductor is extremely easy to generate delamination phenomenon after being immersed in epoxy resin under vacuum pressure, so that the performance of the superconducting coil is irreversibly degraded. Based on the above, the embodiment of the invention changes the surface energy and the contact angle of the metal surface of the superconducting coating conductor by coating the release agent layer on the surface of the rare earth barium copper oxygen superconducting coating conductor, reduces the wettability of the epoxy resin and the superconducting coating conductor surface, greatly reduces the binding force between the epoxy resin and the superconducting coating conductor surface after the epoxy resin is solidified, separates the superconducting coating conductor surface from the epoxy resin under extremely low stress after the epoxy resin is cooled, blocks the transmission of the shrinkage thermal stress of the epoxy resin to the coating conductor, and prevents the delamination phenomenon caused by the overlarge normal stress of the coating conductor surface due to different thermal expansion coefficients of materials in the temperature change process, thereby protecting the rare earth barium copper oxygen superconducting coating conductor and improving the stability of the rare earth barium copper oxygen high-temperature superconducting coil.
In the embodiment of the application, when a dry winding process is adopted for winding, epoxy resin is used for vacuum pressure impregnation on the rare earth barium copper oxygen high-temperature superconducting coil obtained after winding, so that the epoxy resin fully enters coil turns;
when the winding adopts a wet winding process, epoxy resin is coated on the surface of the rare earth barium copper oxygen superconducting coated conductor in the winding process of the rare earth barium copper oxygen superconducting coated conductor, and then the rare earth barium copper oxygen superconducting coil is obtained after curing under the curing condition corresponding to the epoxy resin.
In embodiments of the present application, the rare earth barium copper oxygen superconducting coated conductor includes, but is not limited to, any one of a coated conductor with copper plated on the surface, a coated conductor with copper strips on the upper and lower surfaces encapsulated by solder, or a coated conductor with stainless steel strips on the upper and lower surfaces encapsulated by solder.
In the examples of the present application, the layer thickness of the release agent layer is 1nm to 1mm, and may be, for example, 1nm, 10nm, 100nm, 500nm, 800nm, 1 μm, 50 μm, 200 μm, 500 μm, 750 μm or 1mm, but is not limited to the values recited, and other values not recited in the range of the values are equally applicable.
In embodiments of the present application, the release agent in the release agent layer includes, but is not limited to, at least one of polytetrafluoroethylene, polyethylene, polyisobutylene, perchloroethylene, polyvinyl alcohol, polystyrene, polyvinyl acetal, polydimethylsiloxane, fluororesin, fluorine release agent, paraffin wax, vaseline, polyethylene wax, polyethylene glycol, glycerin, polyimide.
In the embodiment of the application, the surface of the rare earth barium copper oxygen superconducting coating conductor comprises two wide surfaces and two side surfaces of the coating conductor, wherein the wide surface where the superconducting layer is positioned is an upper surface, and the wide surface where the basal layer is positioned is a lower surface; the release agent coated surface may comprise any combination of the four surfaces described above.
In embodiments of the present application, the means for applying includes, but is not limited to, at least one of direct manual application using a tooling, or manual application using a tooling after heating the release agent, or spraying the release agent from a spray head by dissolving the release agent in a solvent, or spraying the release agent from a spray head after heating.
In embodiments of the present application, the epoxy resin designations include, but are not limited to Stycast 2850 TM 、Stycast 1266 TM At least one of DW-3, CTD-101K, araldite CY5538, IR3, CR 2.
As a possible example, as shown in fig. 2, a schematic diagram of a tooling design for coating a surface of a rare earth barium copper oxygen superconducting coated conductor with a liquid release agent is shown. When the release agent is coated, the rare earth barium copper oxygen superconducting coated conductor 1 is firstly unfolded in a certain form to expose the surface to be coated. The release agent storage tank 6 is used to store a certain amount of release agent. The coating wheel 5 provided at the lower side of the rare earth barium copper oxygen superconducting coated conductor 1 coats the release agent in the reservoir on the lower surface of the rare earth barium copper oxygen superconducting coated conductor 1 during rotation. Liquid and semi-solid release agents such as fluorine release agents and the like can be directly coated, solid release agents such as paraffin and the like need to be heated first, then the rare earth barium copper oxygen superconducting coated conductor 1 is placed under the proper conditions of various release agents to form a stable release agent layer 2, and the fluorine release agent needs to be heated for a period of time at a certain temperature. The surface of the rare earth barium copper oxygen superconducting coating conductor is provided with a compression wheel 4 which can form a certain pressure with a coating wheel 5 so as to control the thickness of the release agent layer 2. The suitable thickness of each release agent to function is different, for example, the suitable thickness of the fluorine release agent is about ten micrometers or more, and the suitable thickness of the polytetrafluoroethylene coating is 100 micrometers or more.
In embodiments of the present application, the target shape of the rare earth barium copper oxygen high temperature superconducting coil includes, but is not limited to, at least one of a circular coil, a D-coil, a racetrack coil, a saddle coil, a single pancake coil, a double pancake coil, a solenoid coil, a layer wound coil.
In the examples of the present application, the curing temperature is 0 to 200 ℃, for example, 20 ℃, 50 ℃, 75 ℃, 100 ℃, 120 ℃, 150 ℃, 180 ℃, or 200 ℃, but the curing temperature is not limited to the recited values, and other non-recited values within the recited values are equally applicable.
Fig. 3-5 are schematic cross-sectional structures of rare earth barium copper oxygen superconducting coated conductors coated with a release agent layer on the surfaces after epoxy resin impregnation and curing. In fig. 3, four surfaces of the outer side of the rare earth barium copper oxygen superconducting coated conductor 1 are coated with a uniform release agent layer 2, and the cured epoxy resin layer 3 is arranged outside the release agent layer 2; in fig. 4, the three surfaces of the rare earth barium copper oxygen superconducting coating conductor 1 except the lower surface are coated with a uniform release agent layer 2, the cured epoxy resin layer 3 is arranged outside the release agent layer 2, and the lower surface of the rare earth barium copper oxygen superconducting coating conductor 1 has a better bonding effect with epoxy resin; in fig. 5, the upper surface of the rare earth barium copper oxygen superconducting coated conductor 1 is coated with a uniform release agent layer 2, the rest three surfaces are not coated with the release agent layer 2, the outside of the conductor and the outside of the release agent layer 2 are cured epoxy resin layers 3, and the rest three surfaces of the rare earth barium copper oxygen superconducting coated conductor 1 except the upper surface have better bonding effect with epoxy resin. In fig. 3-5, the base layer 101 in the rare earth barium copper oxygen superconducting coated conductor, the buffer layer 102 in the rare earth barium copper oxygen superconducting coated conductor, the superconducting layer 103 in the rare earth barium copper oxygen superconducting coated conductor, and the copper plating layer 104 in the rare earth barium copper oxygen superconducting coated conductor together form the rare earth barium copper oxygen superconducting coated conductor 1.
Fig. 6-8 are schematic cross-sectional views of rare earth barium copper oxygen superconducting coated conductor with encapsulation layer coated with release agent layer on surface after epoxy resin impregnation and curing. In fig. 6, four surfaces of the outer side of the rare earth barium copper oxygen superconducting coated conductor 1 are coated with a uniform release agent layer 2, and the cured epoxy resin layer 3 is arranged outside the release agent layer 2; in fig. 7, three surfaces of the rare earth barium copper oxygen superconducting coating conductor 1 except the lower surface are coated with a uniform release agent layer 2, and the lower surface of the conductor has a better bonding effect with epoxy resin; in fig. 8, the upper surface of the rare earth barium copper oxygen superconducting coated conductor 1 is coated with a uniform release agent layer 2, the rest three surfaces are not coated with the release agent layer 2, the outside of the conductor 1 and the outside of the release agent layer 2 are cured epoxy resin layers 3, and the rest three surfaces of the rare earth barium copper oxygen superconducting coated conductor 1 except the upper surface have better bonding effect with epoxy resin. In fig. 6-8, the base layer 101 in the rare earth barium copper oxide superconducting coated conductor, the buffer layer 102 in the rare earth barium copper oxide superconducting coated conductor, the superconducting layer 103 in the rare earth barium copper oxide superconducting coated conductor, the copper plating layer 104 in the rare earth barium copper oxide superconducting coated conductor, the encapsulation layer 105 in the rare earth barium copper oxide superconducting coated conductor, and the solder layer 106 in the rare earth barium copper oxide superconducting coated conductor together form the rare earth barium copper oxide superconducting coated conductor 1 with the encapsulation layer.
Fig. 9 to 11 are schematic cross-sectional structures of rare earth barium copper oxygen superconducting coated conductors coated with a release agent layer on the surface, which are wound into coils and subjected to epoxy resin impregnation curing. The four surfaces of each turn of the rare earth barium copper oxygen superconducting coated conductor 1 in fig. 9 are coated with release agent layers 2, the other three surfaces of each turn of the rare earth barium copper oxygen superconducting coated conductor 1 except the lower surface in fig. 10 are coated with release agent layers 2, and the areas except the rare earth barium copper oxygen superconducting coated conductor 1 and the release agent layers 2 are filled with epoxy resin; in fig. 11, the upper surface of each turn of the rare earth barium copper oxygen superconducting coated conductor 1 is coated with a uniform release agent layer 2, the other three surfaces are not coated with the release agent layer 2, and the areas except the rare earth barium copper oxygen superconducting coated conductor 1 and the release agent layer 2 are filled with epoxy resin. As can be seen from fig. 9 to 11, the rare earth barium copper oxygen high temperature superconducting coil is composed of a periodic structure formed in radial direction by a rare earth barium copper oxygen superconducting coated conductor 1, a release agent layer 2 and an epoxy resin layer 3.
The embodiment of the invention also provides a rare earth barium copper oxygen high-temperature superconducting coil, which is prepared by the manufacturing method, can avoid the phenomenon of delamination and degradation after being impregnated with epoxy resin, has good stability and reliability and has wide application prospect.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, 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. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A manufacturing method of rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination is characterized by comprising the following steps:
(1) Coating a release agent layer on the surface of a rare earth barium copper oxygen superconducting coating conductor, and winding the rare earth barium copper oxygen superconducting coating conductor coated with the release agent layer to form a rare earth barium copper oxygen high-temperature superconducting coil in a target shape;
(2) And (3) performing epoxy resin curing on the wound rare earth barium copper oxygen high-temperature superconducting coil.
2. The method for manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination according to claim 1, wherein when the winding adopts a dry winding process, vacuum pressure impregnation is performed on the rare earth barium copper oxygen high temperature superconducting coil obtained after winding by using epoxy resin;
when the winding adopts a wet winding process, epoxy resin is coated on the surface of the rare earth barium copper oxygen superconducting coating conductor in the winding process of the rare earth barium copper oxygen superconducting coating conductor.
3. The method of claim 1, wherein the rare earth barium copper oxygen superconducting coated conductor includes at least one of a coated conductor with copper plated on the surface, a coated conductor with copper strips on the upper and lower surfaces encapsulated by solder, or a coated conductor with stainless steel strips on the upper and lower surfaces encapsulated by solder.
4. The method for manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination according to claim 1, wherein the layer thickness of the release agent layer is 1nm to 1mm.
5. The method of manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination according to claim 4, wherein the release agent in the release agent layer includes, but is not limited to, at least one of polytetrafluoroethylene, polyethylene, polyisobutylene, perchloroethylene, polyvinyl alcohol, polystyrene, polyvinyl acetal, polydimethylsiloxane, fluororesin, fluorine release agent, paraffin wax, vaseline, polyethylene wax, polyethylene glycol, glycerin, polyimide.
6. The method of claim 1, wherein the coating includes, but is not limited to, at least one of direct manual coating using a tooling, manual coating using a tooling after heating the release agent, spraying the release agent from a spray head after dissolving the release agent in a solvent, or spraying the release agent from a spray head after heating.
7. The method for manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination according to claim 1, wherein the epoxy resin comprises the trade mark including but not limited to Stycast 2850 TM 、Stycast 1266 TM At least one of DW-3, CTD-101K, araldite CY5538, IR3, CR 2.
8. The method of claim 1, wherein the target shape of the rare earth barium copper oxygen high temperature superconducting coil includes at least one of a round coil, a D-coil, a racetrack coil, a saddle coil, a single pancake coil, a double pancake coil, a solenoid coil, and a layer coil.
9. The method for manufacturing a rare earth barium copper oxygen high temperature superconducting coil capable of avoiding delamination according to claim 1, wherein the curing temperature is 0 ℃ to 200 ℃.
10. A rare earth barium copper oxygen high temperature superconducting coil, characterized in that the rare earth barium copper oxygen high temperature superconducting coil is manufactured by the manufacturing method of any one of claims 1 to 9.
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|---|---|---|---|
| CN202311619478.8A CN117476356A (en) | 2023-11-29 | 2023-11-29 | Rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311619478.8A CN117476356A (en) | 2023-11-29 | 2023-11-29 | Rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and manufacturing method thereof |
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| CN117476356A true CN117476356A (en) | 2024-01-30 |
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| CN202311619478.8A Pending CN117476356A (en) | 2023-11-29 | 2023-11-29 | Rare earth barium copper oxygen high-temperature superconducting coil capable of avoiding delamination and manufacturing method thereof |
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| CN (1) | CN117476356A (en) |
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