CN114530327B - Bi2212 magnet insulation structure and preparation method thereof - Google Patents
Bi2212 magnet insulation structure and preparation method thereof Download PDFInfo
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- CN114530327B CN114530327B CN202210424153.3A CN202210424153A CN114530327B CN 114530327 B CN114530327 B CN 114530327B CN 202210424153 A CN202210424153 A CN 202210424153A CN 114530327 B CN114530327 B CN 114530327B
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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
- H01F41/12—Insulating of windings
- H01F41/122—Insulating between turns or between winding layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/048—Superconductive coils
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention disclosesA Bi2212 magnet insulation structure and a preparation method thereof are provided, which belong to the field of superconducting magnet insulation materials. In the preparation method, the specially treated fiber band is selected and matched with the low-temperature epoxy resin to prepare the Bi2212 superconducting magnet insulating structure, so that the high mechanical property and the high insulating property can be both considered, and the using effect is superior to that of the existing Nb in some cases3A Sn magnet. The invention also discloses the Bi2212 magnet insulation structure obtained by the preparation method and application thereof in preparation of a superconducting magnet device.
Description
Technical Field
The invention relates to the field of superconducting magnet insulating materials, in particular to a Bi2212 magnet insulating structure and a preparation method thereof.
Background
Bi2212 (namely high-temperature superconducting bismuth Bi)2Sr2CaCuOx) The superconducting material has the advantages of excellent low-temperature high-magnetic-field current-carrying performance, high mechanical strength and the like, is the only high-temperature superconducting material capable of being prepared into isotropic round wires, and can be the preferred material for preparing CICC (tubular cable superconductor) type high-temperature superconducting conductors by adopting a conventional manufacturing method at present.
The insulating structure serving as the high-temperature superconducting magnet not only bears the requirement of the mechanical load of the superconducting magnet structure under a high field, but also meets the requirement of high-strength electrical insulating property, and the safety and the reliability of the whole magnet are influenced by the good and bad properties of the insulating structure. However, the Bi2212 high-temperature superconducting material needs to be subjected to oxygen-enriched environment and high-pressure high-temperature heat treatment, which brings many new technical problems for developing a Bi2212 superconducting magnet insulating structure based on a process route of 'coiling first and then reacting', on one hand, the mechanical property of a fiber tape in the structure is reduced after long-time high-temperature heat treatment (the temperature is up to 890 ℃), and on the other hand, the insulating property is influenced by the carbonization of a fiber tape surface wetting agent after heat treatment.
The current insulation material-thermosetting epoxy resin and composite material system thereof inevitably leads to the reduction of the service life and various performance parameters thereof due to the continuous change of stress and temperature field and the existence of low temperature brittleness and defects thereof.
In summary, the insulating material and the traditional related molding process technology adopted at present cannot meet the performance requirements of the insulating structure in the next generation of Bi2212 high-temperature superconducting magnet, such as high mechanical and electrical properties.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide a preparation method of a Bi2212 magnet insulation structure, in the method, a specially-treated fiber band is selected and matched with low-temperature epoxy resin to prepare the Bi2212 superconducting magnet insulation structure, the high mechanical property and the high insulation property can be both considered, and the Bi2212 superconducting magnet insulation structure can bear a strong magnetic field of more than 20T (the existing Nb is taken as an inserted magnet at a low temperature of 4.2K) (the existing Nb is taken as an inserted magnet)3The Sn magnet structure bears the force within 20T only), and has higher current carrying capacity at the high temperature of 20K.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a Bi2212 magnet insulation structure comprises the following steps:
(1) taking an alumina fiber belt, and keeping the temperature of the alumina fiber belt at 400-600 ℃ for 2-5 h;
(2) winding the alumina fiber tape processed in the step (1) on a Bi2212 superconductor to form an inter-turn insulation structure, and carrying out heat treatment at 880-900 ℃;
(3) mixing low-temperature epoxy resin, a diluent and a curing agent, and degassing to obtain mixed resin;
(4) and (3) putting the wrapped Bi2212 superconductor in the step (2) into a mold in a vacuum environment, introducing the mixed resin obtained in the step (3), heating, solidifying, cooling and taking out to obtain the Bi2212 magnet insulating structure.
In the preparation method of the Bi2212 magnet insulation structure, in order to match the condition that the Bi2212 superconductor needs long-time high-temperature heat treatment (the temperature is up to 890 ℃) per se, alumina fiber with high thermal stability is selected as a wrapping tape, and then specific temperature is carried outThe carbon content in the material can be further reduced by the heat treatment, so that the integral insulating property is improved, and the original mechanical property of the material cannot be excessively lost; after the alumina fiber tape wraps the Bi2212 superconductor and is subjected to high-temperature heat treatment, low-temperature epoxy resin is adopted for glue injection, so that the low-temperature performance of the obtained Bi2212 magnet insulation structure can be guaranteed. Compared with the prior art, the preparation method greatly simplifies the operation flow, and the obtained product is compared with the prior Nb3The Sn magnet structure has better service performance.
Meanwhile, the inventor finds that if the degree of the pretreated alumina fiber belt is insufficient, the integral insulating property of the product is difficult to improve; however, if the degree of treatment is too high, the mechanical properties of the alumina fiber tape itself are rapidly lowered to a damping rate of 35% or more.
Preferably, the average size of the alumina fiber tapes in the step (1) is 0.2mm × 25mm,
the component is gamma-Al2O3And SiO2；
More preferably, the alumina fiber band comprises the following components in percentage by mass: 70-75% of gamma Al2O3And 25-30% SiO2。
The aluminum oxide fiber tape is subjected to glue injection treatment after being wrapped to form turn-to-turn insulation, so that the insulation property of the aluminum oxide fiber tape needs to be guaranteed, the wrapping treatment effect of the fiber tape with the size is better, and meanwhile, after pretreatment under the initial purity, free impurities hardly permeate into a resin system in a subsequent process to influence the product performance.
Preferably, the step (1) of maintaining the alumina fiber tape is performed in an air atmosphere.
The aluminum oxide fiber belt is subjected to heat treatment in an air atmosphere, so that the carbon content in the material can be further reduced, and the influence of the conductive component on the overall insulating property of the product is lower.
Preferably, the low-temperature epoxy resin in the step (3) is bisphenol F epoxy resin;
more preferably, the bisphenol F epoxy resin is GY 282.
Preferably, the diluent in the step (3) is polypropylene glycol diglycidyl ether;
more preferably, the polypropylene glycol diglycidyl ether is DY 3601.
Preferably, the curing agent in the step (3) is diethyltoluenediamine;
more preferably, the diethyltoluenediamine is HY 5200.
Preferably, the mass ratio of the low-temperature epoxy resin, the diluent and the curing agent in the step (3) is (58-62): (38-42): (20-22).
In order to ensure the glue injection uniformity and rapid curing property of the mixed resin, the proportion and the type of the three components need to be effectively coordinated, and if the coordination is not proper, the phenomena of overlong curing time, overhigh curing temperature, uneven glue injection and the like can occur, and the low-temperature performance, the insulating property or the mechanical property of the product can be influenced under the conditions. The screening of the inventor shows that the product has better effect under the types and the proportions.
Preferably, the temperature for heating and curing in the step (4) is 120-140 ℃.
The invention also aims to provide the Bi2212 magnet insulating structure prepared by the preparation method of the Bi2212 magnet insulating structure.
Compared with the existing Nb, the Bi2212 magnet insulation structure3The Sn magnet structure has better low-temperature insulating property and mechanical property, can break through the bearable magnetic field force of more than 20T when being used as an inserted magnet, and has high production cost performance.
The invention further aims to provide application of the Bi2212 magnet insulation structure in preparation of a superconducting magnet device.
The invention has the beneficial effects that: the invention provides a preparation method of a Bi2212 magnet insulation structure, in the method, a specially treated fiber band is selected and matched with low-temperature epoxy resin to prepare the Bi2212 superconducting magnet insulation structure, so that high mechanical property and high insulation property can be considered, and the using effect is superior to that of the existing Nb in some cases3A Sn magnet. The inventionAlso provides the Bi2212 magnet insulation structure obtained by the preparation method and application thereof in preparing superconducting magnet devices.
Detailed Description
The raw materials used in the examples of the present invention were purchased from commercial sources unless otherwise specified.
For better illustrating the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples, which are intended to be understood in detail, but not intended to limit the present invention.
Example 1
One embodiment of a Bi2212 magnet insulation structure and a preparation method thereof comprises the following steps:
(1) taking an alumina fiber tape (TP 25S: Suzhou Alsai inorganic material Co., Ltd.) and preserving the heat for 2 hours at the temperature of 600 ℃ in the air;
(2) winding the alumina fiber tape treated in the step (1) on a Bi2212 superconductor to form an inter-turn insulation structure, carrying out necessary cleaning and inspection on the inter-turn insulation structure, and then carrying out 890 ℃ heat treatment;
(3) mixing low-temperature epoxy resin (GY 282), diluent (DY 3601) and curing agent (HY 5200) according to a mass ratio of 60:40:21, and degassing to obtain mixed resin;
(4) and (3) placing the wrapped Bi2212 superconductor in the step (2) into a vacuum mold, sealing and detecting leakage until the vacuum pressure impregnation condition is met, debugging the whole vacuum reaction system (connecting a vacuum impregnation tank, a vacuum mixing tank, a vacuum resin tank, a vacuum curing agent tank and a vacuum injection tank to a vacuum pumping system and a temperature control system to meet the requirements of vacuum and cleanliness), introducing the mixed resin obtained in the step (3), setting a heating program, heating and curing at 130 ℃ for 32h, cooling to room temperature and dismantling the mold to obtain the Bi2212 magnet insulation structure.
Example 2
An embodiment of a Bi2212 magnet insulation structure and a preparation method thereof, the method comprises the following steps:
(1) taking an alumina fiber tape (TP 25S: Suzhou Alsai inorganic material Co., Ltd.) and preserving the heat for 4 hours at 500 ℃ in the air;
(2) winding the alumina fiber tape treated in the step (1) on a Bi2212 superconductor to form an inter-turn insulation structure, performing necessary cleaning and inspection on the inter-turn insulation structure, and then performing heat treatment at 895 ℃;
(3) mixing low-temperature epoxy resin (GY 282), diluent (DY 3601) and curing agent (HY 5200) according to a mass ratio of 58:42:21, and degassing to obtain mixed resin;
(4) and (3) placing the wrapped Bi2212 superconductor in the step (2) into a vacuum mold, sealing and detecting leakage until the vacuum pressure impregnation condition is met, debugging the whole vacuum reaction system (connecting a vacuum impregnation tank, a vacuum mixing tank, a vacuum resin tank, a vacuum curing agent tank and a vacuum injection tank to a vacuum pumping system and a temperature control system to meet the requirements of vacuum and cleanliness), introducing the mixed resin obtained in the step (3), setting a heating program, heating and curing at 140 ℃ for 28h, cooling to room temperature and dismantling the mold to obtain the Bi2212 magnet insulation structure.
Example 3
An embodiment of a Bi2212 magnet insulation structure and a preparation method thereof, the method comprises the following steps:
(1) taking an alumina fiber tape (TP 25S: Suzhou Alsai inorganic material Co., Ltd.) and preserving the heat for 5 hours at the temperature of 400 ℃ in the air;
(2) winding the alumina fiber tape treated in the step (1) on a Bi2212 superconductor to form an inter-turn insulation structure, performing necessary cleaning and inspection on the inter-turn insulation structure, and then performing heat treatment at 885 ℃;
(3) mixing low-temperature epoxy resin (GY 282), diluent (DY 3601) and curing agent (HY 5200) according to a mass ratio of 62:38:21, and degassing to obtain mixed resin;
(4) and (3) placing the wrapped Bi2212 superconductor in the step (2) into a vacuum mold, sealing and detecting leakage until the vacuum pressure impregnation condition is met, debugging the whole vacuum reaction system (connecting a vacuum impregnation tank, a vacuum mixing tank, a vacuum resin tank, a vacuum curing agent tank and a vacuum injection tank to a vacuum pumping system and a temperature control system to meet the requirements of vacuum and cleanliness), introducing the mixed resin obtained in the step (3), setting a heating program, heating and curing at 120 ℃ for 35h, cooling to room temperature and dismantling the mold to obtain the Bi2212 magnet insulation structure.
Comparative example 1
The comparative example differs from example 1 only in that the alumina fiber tape of step (1) was not subjected to any treatment.
Comparative example 2
The comparative example differs from example 1 only in that the alumina fiber tape was incubated at 300 ℃ for 5 hours in step (1).
Comparative example 3
The comparative example differs from example 1 only in that the alumina fiber tape in step (1) was incubated at 1000 ℃ for 2 h.
Comparative example 4
The comparative example differs from example 1 only in that the alumina fiber tape was replaced with a glass fiber tape in the step (1).
Effect example 1
In order to verify the using effect of the Bi2212 magnet insulating structure, the products obtained in the examples 1-3 and the comparative examples 1-4 are subjected to tensile strength test and compressive strength test, wherein the test standards are ASTM D638 and ADTM D149.
As shown in the results below, the results were,
example 1: the tensile strength is 543.3MPa, and the insulating strength is 29.2 kV/mm;
example 2: the tensile strength is 543.8 MPa, and the insulating strength is 28.7 kV/mm;
example 3: the tensile strength is 544.1 MPa, and the insulating strength is 28.5 kV/mm;
comparative example 1: the tensile strength is 595.8MPa, and the insulating strength is 26.5 kV/mm;
comparative example 2: the tensile strength is 572.1MPa, and the insulating strength is 27.4 kV/mm;
comparative example 3: the tensile strength is 537.6MPa, and the insulating strength is 29.1 kV/mm;
comparative example 4: the tensile strength is 290MPa, and the insulating strength is 28.6 kV/mm.
It can be seen that the comparative example 1 product, although having better tensile strength, has poorer insulation properties; the insulation strength of the product of comparative example 3 was comparable to that of example 1, but the tensile strength was inferior. When the glass fiber tape is used for preparing products, the tensile strength of the obtained products is poor and the insulation strength of the products is inferior to that of the products in example 1, and the performance of the products in example 1 proves that the Bi2212 magnet insulation structure has good tensile property and insulation performance at the same time.
Effect example 2
In order to verify the effect of the alumina fiber tape in the product of the invention after pretreatment, the alumina fiber tape pretreated in the preparation methods described in examples 1-3 and comparative examples 1-3 (the alumina fiber tape not treated in comparative example 1 was directly taken) was subjected to a strength test and a carbon content test, and the test methods were respectively: the strength test refers to GB/T7689.5, and the carbon content is measured by XPS for the content of four atoms of C, Al, O and Si on the surface, and the carbon atom ratio is calculated.
The results are shown below in the following table,
example 1: the strength was 1716N/25mm, the strength retention was 89.66%, the carbon atom percentage at was 13.38%;
example 2: strength 1724N/25mm, strength retention 90.01%, carbon atom percent at 13.68%;
example 3: the strength is 1757N/25mm, the strength retention rate is 91.80 percent, and the carbon atom percent at is 13.84 percent;
comparative example 1: the strength was 1914N/25mm, the strength retention was 100%, and the carbon atom percentage at was 54.35%;
comparative example 2: the strength is 1492N/25mm, the strength retention rate is 77.95 percent, and the carbon atom percent at is 49.93 percent;
comparative example 3: the intensity was 1420N/25mm, the intensity retention was 74.19%, and the carbon atom percentage at was 13.29%.
It can be seen that the strength of the alumina fiber tape of comparative example 1 without any treatment (i.e., the initial strength of the virgin alumina fiber tape used in each example/comparative example) reached 1716N/25mm, while the pretreated alumina fiber tape of example 1 retained 89.66% of the strength of the raw material, and at the same time, the carbon atom percentage content of the fiber tape was also reduced to 13.38%; the pretreated alumina fiber tape of example 2 retained 90.01% of the strength of the raw material, while the carbon atom percentage content of the tape was also reduced to 13.68%; the pretreated alumina fiber tape of example 3 retained 91.80% of the strength of the raw material, while the carbon atom percentage content of the tape was also reduced to 13.84%; in contrast, the comparative example 3 has a poor strength attenuation degree, and is difficult to apply to practical products.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A preparation method of a Bi2212 magnet insulation structure is characterized by comprising the following steps:
(1) taking an alumina fiber belt, and keeping the temperature of the alumina fiber belt at 400-600 ℃ for 2-5 h in an air atmosphere; the average size of the alumina fiber band is 0.2mm multiplied by 25mm, and the component is gamma-Al2O3And SiO2
(2) Winding the alumina fiber tape processed in the step (1) on a Bi2212 superconductor to form an inter-turn insulation structure, and carrying out heat treatment at 880-900 ℃;
(3) mixing low-temperature epoxy resin, a diluent and a curing agent, and degassing to obtain mixed resin;
(4) and (3) putting the wrapped Bi2212 superconductor in the step (2) into a mold in a vacuum environment, introducing the mixed resin obtained in the step (3), heating, solidifying, cooling and taking out to obtain the Bi2212 magnet insulating structure.
2. The method for preparing the Bi2212 magnet insulating structure as claimed in claim 1, wherein the low-temperature epoxy resin in the step (3) is bisphenol F epoxy resin.
3. The method for preparing a Bi2212 magnet insulating structure of claim 1, wherein the diluent in the step (3) is polypropylene glycol diglycidyl ether.
4. The method for preparing a Bi2212 magnet insulating structure of claim 1, wherein the curing agent in the step (3) is diethyltoluenediamine.
5. The method for preparing the Bi2212 magnet insulating structure as claimed in claim 1, wherein the mass ratio of the low-temperature epoxy resin, the diluent and the curing agent in the step (3) is (58-62): (38-42): (20-22).
6. The method for preparing a Bi2212 magnet insulating structure as claimed in claim 1, wherein the temperature of the heating curing in the step (4) is 120-140 ℃.
7. The Bi2212 magnet insulating structure prepared by the preparation method of the Bi2212 magnet insulating structure as defined in any one of claims 1-6.
8. The use of the Bi2212 magnet insulation structure of claim 7 in the preparation of superconducting magnet devices.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61276307A (en) * | 1985-05-31 | 1986-12-06 | Mitsubishi Electric Corp | Super conductive coil |
| JPH09129438A (en) * | 1995-10-30 | 1997-05-16 | Hitachi Ltd | Oxide superconductive coil and manufacture thereof |
| JPH11106478A (en) * | 1997-09-30 | 1999-04-20 | Nippon Kayaku Co Ltd | Epoxy resin composition for cryogenic temperature |
| KR100758976B1 (en) * | 2006-05-29 | 2007-09-14 | 김춘식 | Manufacturing method of electromagnet coil by vacuum molding of thermosetting resin with low viscosity epoxy resin |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8522420B2 (en) * | 2008-06-26 | 2013-09-03 | Oxford Superconducting Technology, Inc. | Manufacture of high temperature superconductor coils |
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- 2022-04-22 CN CN202210424153.3A patent/CN114530327B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61276307A (en) * | 1985-05-31 | 1986-12-06 | Mitsubishi Electric Corp | Super conductive coil |
| JPH09129438A (en) * | 1995-10-30 | 1997-05-16 | Hitachi Ltd | Oxide superconductive coil and manufacture thereof |
| JPH11106478A (en) * | 1997-09-30 | 1999-04-20 | Nippon Kayaku Co Ltd | Epoxy resin composition for cryogenic temperature |
| KR100758976B1 (en) * | 2006-05-29 | 2007-09-14 | 김춘식 | Manufacturing method of electromagnet coil by vacuum molding of thermosetting resin with low viscosity epoxy resin |
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