A method for efficient batch production of REBCO single domain bulk

Abstract

This invention discloses a method for efficient batch preparation of REBCO single-domain bulk materials. The method includes: 1. uniformly mixing raw materials to prepare precursor powder; 2. using the precursor powder to prepare solid-phase precursors, liquid-phase precursors, and support blocks; 3. placing multiple solid-phase precursors above the liquid-phase precursors, and placing the support blocks and alumina pads below the liquid-phase precursors; 4. placing a seed crystal on top of the solid-phase precursors to form a precursor composition, which is then transferred to a sintering furnace for seed crystal-induced growth of multiple REBCO single-domain bulk materials. This invention uses the same liquid-phase precursor to simultaneously provide the liquid phase source required for crystal growth in multiple solid-phase precursors, achieving simultaneous growth of multiple REBCO single-domain superconducting bulk materials in a single preparation process. This shortens the precursor preparation process, improves batch preparation efficiency, has a short cycle time, low pollution, and is environmentally friendly. The product is suitable for the superconducting field.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature superconducting materials technology, specifically relating to a method for efficient batch preparation of REBCO single-domain bulk materials. Background Technology

[0002] REBa2Cu3O 7-δ (REBCO, RE=Y, Gd, Sm, Nd, etc.) superconductors were the first discovered by researchers T c Oxide superconductors exceeding the temperature of liquid nitrogen (77K). Due to their high upper critical field and irreversible field, REBCO superconductors have broad application prospects in superconducting bearings, superconducting magnetic levitation, and superconducting energy storage. Currently, there are two main methods for preparing single-domain REBCO superconducting bulk materials: top-seed melt growth and top-seed melt infiltration growth. The melt growth method involves uniformly mixing RE123 and RE211 in a certain proportion and then uniaxially cold-pressing them into a block, eliminating the need to press the liquid-phase precursor. In contrast, the melt infiltration growth method requires pressing the solid-phase and liquid-phase precursors separately. However, severe liquid phase loss during the melt growth process can lead to uniaxial bulk material growth failure; therefore, additional liquid-phase precursors are added during the peritectic reaction stage to replenish the liquid phase source.

[0003] However, both melt growth and melt infiltration growth methods still face numerous technical bottlenecks hindering their industrialization in actual large-scale production and application, with low production efficiency being a prominent issue. Specifically, whether it's adding an extra liquid phase precursor to compensate for liquid phase loss in melt growth or the inherent process requirements of melt infiltration growth, each REBCO superconducting bulk material needs its own liquid phase precursor for individual pressing. While this process effectively improves liquid phase supply and increases the success rate of single-domain growth, it also prolongs the bulk material preparation cycle and makes large-scale mass production difficult, severely limiting the preparation efficiency of REBCO superconducting bulk materials. Furthermore, after the precursor is pressed, some precursor powder inevitably remains on the mold surface. To prevent this residual powder from affecting the molding quality and purity of subsequent bulk materials, the mold must be specially cleaned. This cleaning process uses chemical reagents such as acetic acid, which not only increases preparation costs but also pollutes water bodies, soil, and other ecological environments when discharged.

[0004] Therefore, developing a REBCO superconducting bulk material preparation process that can simplify the liquid-phase precursor preparation process, improve production efficiency, and reduce environmental pollution has become one of the important technical problems that urgently need to be solved in this field. Summary of the Invention

[0005] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing a method for the efficient batch preparation of REBCO single-domain bulk materials. This method employs a shared liquid-phase precursor process, enabling the same liquid-phase precursor to simultaneously provide the liquid phase source required for crystal growth in multiple solid-phase precursors. This allows for the simultaneous growth of multiple REBCO single-domain superconducting bulk materials in a single preparation process, significantly improving preparation efficiency, effectively reducing the number of liquid-phase precursor pressing operations, and consequently reducing the frequency of mold cleaning and the amount of chemical reagents used. This solves the problems of long preparation cycles and high pollution associated with existing preparation processes.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for efficient batch preparation of REBCO single-domain bulk materials, characterized in that the method includes the following steps: Step 1: Mix the raw materials evenly to prepare precursor powder; Step 2: Prepare solid-phase precursor, liquid-phase precursor and support block using the precursor powder from Step 1; Step 3: Place the multiple solid-phase precursors from Step 3 above the liquid-phase precursor, and place the support block and alumina pad below the liquid-phase precursor. Step 4: Place the seed crystal on top of the multiple solid-phase precursors from Step 3 to form a precursor composition, and then transfer it to a sintering furnace for seed crystal-induced growth of multiple REBCO single-domain bulk materials.

[0007] Typically, there are 2 to 4 solid-phase precursors.

[0008] The above-described method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that the process of preparing the precursor powder in step one is selected from: RE2O3, BaCO3 and CuO powders were weighed according to the molar ratio of RE:Ba:Cu=1:2:3 and mixed evenly to obtain a mixed powder of RE123 phase; RE2O3, BaCO3 and CuO powders were weighed according to the molar ratio of RE:Ba:Cu=2:1:1 and mixed evenly to obtain a mixed powder of RE211 phase; Weigh out BaCO3 and CuO powders according to the molar ratio of Ba:Cu=3:5 and mix them evenly to obtain a mixed powder of Ba3Cu5O8 phase. Weigh out BaCO3 and CuO powders according to the molar ratio of Ba:Cu=1:1 and mix them evenly to obtain a mixed powder of BaCuO2 phase. Each mixed powder was sintered in air at 880℃~960℃ for 12h~24h and ground. The sintering and grinding process was repeated a total of 3 times to prepare precursor powders of RE123 phase, RE211 phase, Ba3Cu5O8 phase and BaCuO2 phase. The above-mentioned method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that the processes for preparing the solid-phase precursor, liquid-phase precursor, and support block in step two are selected from: The precursor powders of RE123 phase, RE211 phase and BaCuO2 phase were mixed evenly in the following manner: (a) RE123 + (20~30) mol% RE211, (b) RE211 or (c) RE2O3 + (1~2) BaCuO2 to obtain solid precursor powder. Then, the solid precursor powder was uniaxially pressed into a circular solid precursor with a diameter of Ф10mm~40mm using an alloy steel mold. The precursor powders of RE123 phase, Ba3Cu5O8 phase and BaCuO2 phase are mixed evenly in the following ways: (a) RE2O3+(1~2)Ba3Cu5O8, (b) RE123+(0.8~1.2)Ba3Cu5O8 or (c) RE2O3+(8~12) BaCuO2+6CuO to obtain liquid phase source powder. Then, the liquid phase precursor is uniaxially pressed into a circle with a diameter of Ф25mm~100mm or a square with a side length of 25mm~100mm using an alloy steel mold. The mass of the liquid precursor is 1.2 to 2 times the mass of the solid precursor; RE2O3 powder is pressed into circular support blocks with the same diameter / side length as the liquid phase precursor and a thickness of 3mm~5mm using an alloy steel mold.

[0009] The above-mentioned method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that, in step three, multiple solid-phase precursors are placed above the liquid-phase precursors and evenly arranged, and then support blocks and alumina pads are placed below the liquid-phase precursors in a manner with the same central axis.

[0010] The above-mentioned method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that the seed crystals in step four are selected from SmBCO and NdBCO single crystals obtained by cleaving from SmBCO and NdBCO bulk materials, as well as magnesium oxide crystals coated with SmBCO and NdBCO thin films.

[0011] The above-mentioned method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that, in step four, the plane of seed crystal induced growth is horizontally placed on the top surface of the solid precursor to form a precursor composition, and then placed in a heat treatment furnace for high-temperature sintering to prepare multiple REBCO single-domain bulk materials.

[0012] The above-mentioned method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that the high-temperature sintering process is as follows: the precursor composition is heated to 900℃~950℃ at a heating rate of 120℃ / h~180℃ / h and held for 3h~10h, the gas is vented and the reaction generates the RE211 phase; then it is heated to 30℃~60℃ above the peritectic reaction temperature within 2h~3h and held for 30min~60min to melt the liquid phase precursor; then it is cooled to the peritectic reaction temperature at a cooling rate of 1℃ / h~60℃ / h; then it is cooled to 15℃~30℃ below the peritectic reaction temperature at a cooling rate of 0.2℃ / h~0.5℃ / h, during which the RE211 phase reacts with the Ba-Cu-O liquid phase to generate the RE123 phase; finally, it is cooled to room temperature within 15h~24h to obtain multiple single-domain REBCO bulk materials.

[0013] The above-described method for efficient batch preparation of REBCO single-domain bulk materials is characterized in that the RE in the REBCO single-domain bulk materials in step four is Y, Gd, Sm, Nd, or Eu.

[0014] Compared with the prior art, the present invention has the following advantages: 1. This invention arranges multiple solid-phase precursors in an orderly manner on a liquid-phase precursor, using a single liquid-phase precursor as a shared liquid phase supply source. Through the liquid phase migration and diffusion mechanism in the peritectic reaction stage, the same liquid-phase precursor provides the liquid phase source required for crystal growth to multiple solid-phase precursors simultaneously. This enables the synchronous growth of multiple REBCO single-domain superconducting bulk materials in a single preparation process, effectively reducing the number of liquid phase precursor pressing operations, significantly improving preparation efficiency, and realizing the batch growth of bulk materials. This overcomes the technical limitation of traditional preparation techniques where the growth of a single REBCO bulk material requires a single liquid-phase precursor.

[0015] 2. This invention reduces the number of times the liquid phase precursor is pressed, thereby reducing the frequency of mold cleaning and the amount of cleaning chemicals such as acetic acid used, which saves manpower and time costs and is also more environmentally friendly.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a physical image of the REBCO single-domain bulk material prepared in Example 1 of the present invention. Detailed Implementation

[0018] Example 1 This embodiment includes the following steps: Step 1: Weigh BaCO3 and CuO powders according to the molar ratio of Ba:Cu=1:1 and mix them evenly. Sinter them in air at 880℃ for 24 hours and grind them. Then repeat the sintering and grinding process a total of 3 times to obtain the precursor powder of BaCuO2 phase. Step 2: Mix the BaCuO2 phase precursor powder obtained in Step 1 with Y2O3 at a molar ratio of 1:1 to obtain solid precursor powder. Then weigh 4g of solid precursor powder and press it into a circular solid precursor with a diameter of Ф13mm using an alloy steel mold. Repeat this process twice to obtain two circular solid precursors. The precursor powder of BaCuO2 phase obtained in step one is mixed with Y2O3 and CuO in a molar ratio of 10:1:6 to obtain liquid phase source powder. Then, 16g of liquid phase source powder is weighed and pressed into a circular liquid phase precursor with a diameter of Ф30mm using an alloy steel mold. This process is repeated twice to obtain two circular liquid phase precursors. 6g of Y2O3 powder was weighed and pressed into a circular support block with a diameter of Ф30mm and a thickness of 3mm using an alloy steel mold; Step 3: Place the two circular solid-phase precursors from Step 3 on top of the circular liquid-phase precursor in sequence, with a 2mm gap between the edges, and place the circular support block and alumina pad below the liquid-phase precursor in a manner with the same central axis. Step 4: Cleave NdBCO single crystals from the NdBCO bulk material as seed crystals, and then place the smooth planes induced by the two seed crystals at the center of the top surface of the two circular solid-phase precursors in Step 3 to form a precursor composition. Then transfer it to a heat treatment furnace and sinter it at high temperature to induce the growth of two YBCO single-domain bulk materials. The high-temperature sintering process is as follows: the precursor composition is heated to 950℃ at a heating rate of 120℃ / h and held for 3h, venting is performed and the reaction generates the Y211 phase; then, it is heated to 1035℃ within 2h and held for 60min to melt the liquid-phase precursor; next, it is cooled to 1010℃ at a cooling rate of 60℃ / h, then to 1006℃ at a cooling rate of 1℃ / h, and then to 988℃ at a cooling rate of 0.2℃ / h. During the cooling process, the Y211 phase reacts with the Ba-Cu-O liquid phase to generate the Y123 phase; finally, it is cooled to room temperature within 15h to obtain two YBCO single-domain bulk materials, such as... Figure 1 As shown.

[0019] In this embodiment, the Y in the YBCO single-domain bulk material can also be replaced with Nd or Eu.

[0020] Example 2 This embodiment includes the following steps: Step 1: Weigh BaCO3 and CuO powders according to the molar ratio of Ba:Cu=1:1 and mix them evenly. Sinter them in air at 880℃ for 24 hours and grind them. Then repeat the sintering and grinding process a total of 3 times to obtain the precursor powder of BaCuO2 phase. Step 2: Mix the BaCuO2 phase precursor powder obtained in Step 1 with Y2O3 at a molar ratio of 1:1 to obtain solid precursor powder. Then weigh 4g of solid precursor powder and press it into a circular solid precursor with a diameter of Ф13mm using an alloy steel mold. Repeat this process twice to obtain two circular solid precursors. The precursor powder of BaCuO2 phase obtained in step one is mixed with Y2O3 and CuO in a molar ratio of 10:1:6 to obtain liquid phase source powder. Then, 16g of liquid phase source powder is weighed and pressed into a circular liquid phase precursor with a diameter of Ф30mm using an alloy steel mold. This process is repeated twice to obtain two circular liquid phase precursors. 6g of Y2O3 powder was weighed and pressed into a circular support block with a diameter of Ф30mm and a thickness of 3mm using an alloy steel mold; Step 3: Place the two circular solid-phase precursors from Step 3 on top of the circular liquid-phase precursor in sequence, with a 2mm gap between the edges, and place the circular support block and alumina pad below the liquid-phase precursor in a manner with the same central axis. Step 4: Cleave NdBCO single crystals from the NdBCO bulk material as seed crystals, and then place the smooth planes induced by the two seed crystals at the center of the top surface of the two circular solid-phase precursors in Step 3 to form a precursor composition. Then transfer it to a heat treatment furnace and sinter it at high temperature to induce the growth of two YBCO single-domain bulk materials. The high-temperature sintering process is as follows: the precursor composition is heated to 900℃ at a heating rate of 180℃ / h and held for 10h, the gas is vented and reacted to generate the Y211 phase; then it is heated to 1050℃ within 3h and held for 30min to melt the liquid phase precursor; then it is cooled to 1000℃ at a cooling rate of 1℃ / h, and then further cooled to 975℃ at a cooling rate of 0.2℃ / h. During the cooling, the Y211 phase reacts with the Ba-Cu-O liquid phase to generate the Y123 phase; finally, it is cooled to room temperature within 15h to obtain two YBCO single-domain bulk materials.

[0021] Example 3 This embodiment includes the following steps: Step 1: Weigh Gd2O3, BaCO3 and CuO powders according to the molar ratio of Gd:Ba:Cu=2:1:1 and mix them evenly. Sinter them in air at 920℃ for 24 hours and grind them. Then repeat the sintering and grinding process a total of 3 times to obtain the precursor powder of Gd211 phase. Gd2O3, BaCO3 and CuO powders were weighed according to the molar ratio of Gd: Ba: Cu=1:2:3 and mixed evenly. The mixture was sintered in air at 940℃ for 20h and then ground. The sintering and grinding process was repeated a total of 3 times to obtain the precursor powder of Gd123 phase. BaCO3 and CuO powders were weighed according to the molar ratio of Ba:Cu=3:5 and mixed evenly. The mixture was sintered in air at 960℃ for 12 hours and then ground. The sintering and grinding process was repeated a total of 3 times to obtain the precursor powder of Ba3Cu5O8 phase. Step 2: Weigh 9g of the Gd211 phase precursor powder obtained in Step 1, and then use an alloy steel mold to uniaxially press it into a circular solid precursor with a diameter of Ф20mm. Repeat this process a total of 4 times to obtain 4 circular solid precursors. The precursor powder of the Gd123 phase obtained in step one is mixed with the precursor powder of the Ba3Cu5O8 phase at a molar ratio of 1:1.2 to obtain liquid phase source powder. Then, 70g of liquid phase source powder is weighed and pressed into a square liquid phase precursor with a side length of 65mm×65mm using an alloy steel mold. Weigh 30g of Gd2O3 powder and press it into a square support block with a side length of 65mm×65mm using an alloy steel mold; Step 3: Place the four circular solid-phase precursors from Step 3 on top of the square liquid-phase precursor in sequence, and place the square support block and alumina pad below the liquid-phase precursor in a manner with the same central axis. Step 4: Cleave SmBCO single crystals from the SmBCO bulk material as seed crystals, and then place the smooth planes induced by the four seed crystals at the center of the top surface of the four circular solid-phase precursors in Step 3 to form a precursor composition. Then transfer it to a heat treatment furnace and sinter it at high temperature to induce the growth of four GdBCO single-domain bulk materials. The high-temperature sintering process is as follows: the precursor composition is heated to 1065°C at a heating rate of 150°C / h and held at that temperature for 0.75h to melt the liquid precursor; then it is cooled to 1042°C at a cooling rate of 60°C / h, and then further cooled to 1016°C at a cooling rate of 0.3°C / h. During the cooling process, the Gd211 phase reacts with the Ba-Cu-O liquid phase to generate the Gd123 phase; finally, it is cooled to room temperature within 20h to obtain four single-domain GdBCO bulk materials.

[0022] Example 4 This embodiment includes the following steps: Step 1: Weigh out Sm2O3, BaCO3 and CuO powders according to the molar ratio of Sm:Ba:Cu=2:1:1 and mix them evenly. Sinter them in air at 930℃ for 12 hours and grind them. Then repeat the sintering and grinding process a total of 3 times to obtain the precursor powder of Sm211 phase. Sm2O3, BaCO3 and CuO powders were weighed according to the molar ratio of Sm:Ba:Cu=1:2:3 and mixed evenly. The mixture was sintered in air at 950℃ for 15h and then ground. The sintering and grinding process was repeated a total of 3 times to obtain the precursor powder of Sm123 phase. BaCO3 and CuO powders were weighed according to the molar ratio of Ba:Cu=3:5 and mixed evenly. The mixture was sintered in air at 910℃ for 20h and then ground. The sintering and grinding process was repeated a total of 3 times to obtain the precursor powder of Ba3Cu5O8 phase. Step 2: Mix the Sm123 phase precursor powder and the Sm211 phase precursor powder obtained in Step 1 at a molar ratio of 1:0.2 to obtain solid phase precursor powder. Then weigh 20g of solid phase precursor powder and press it into a circular solid phase precursor with a diameter of Ф30mm using an alloy steel mold. Repeat this process twice to obtain two circular solid phase precursors. The precursor powder of the Sm123 phase obtained in step one is mixed with the precursor powder of the Ba3Cu5O8 phase at a molar ratio of 1:1 to obtain liquid phase source powder. Then, 120g of liquid phase source powder is weighed and pressed into a circular liquid phase precursor with a diameter of Ф75mm using an alloy steel mold. 42g of Sm2O3 powder was weighed and pressed into a circular support block with a diameter of Ф75mm and a thickness of 5mm using an alloy steel mold; Step 3: Place the two circular solid-phase precursors from Step 3 on top of the two circular liquid-phase precursors in sequence, and place the circular support block and alumina pad below the circular liquid-phase precursors in a manner with the same central axis. Step 4: Use the magnesium oxide single crystal coated with NdBCO film as seed crystal, and then place the NdBCO film surface of the two seed crystals at the center of the top surface of the two circular solid phase precursors in Step 3 to form a precursor composition. Then transfer it to a heat treatment furnace and sinter it at high temperature to induce the growth of two SmBCO single-domain bulk materials. The high-temperature sintering process is as follows: the precursor composition is heated to 1070°C at a heating rate of 120°C / h and held for 2 hours to melt the liquid precursor; then it is cooled to 1040°C at a cooling rate of 12°C / h, and then further cooled to 1015°C at a cooling rate of 0.4°C / h. During the cooling process, the Sm211 phase reacts with the Ba-Cu-O liquid phase to generate the Sm123 phase; finally, it is cooled to room temperature within 24 hours to obtain two single-domain SmBCO blocks.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A method for efficient batch preparation of REBCO single-domain bulk materials, characterized in that, The method includes the following steps: Step 1: Mix the raw materials evenly to prepare precursor powder; Step 2: Prepare solid-phase precursor, liquid-phase precursor and support block using the precursor powder from Step 1; Step 3: Place the multiple solid-phase precursors from Step 3 above the liquid-phase precursor, and place the support block and alumina pad below the liquid-phase precursor. Step 4: Place the seed crystal on top of the multiple solid-phase precursors from Step 3 to form a precursor composition, and then transfer it to a sintering furnace for seed crystal-induced growth of multiple REBCO single-domain bulk materials.

2. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 1, characterized in that, The process of preparing the precursor powder in step one is selected from: RE2O3, BaCO3 and CuO powders were weighed according to the molar ratio of RE:Ba:Cu=1:2:3 and mixed evenly to obtain a mixed powder of RE123 phase; RE2O3, BaCO3 and CuO powders were weighed according to the molar ratio of RE:Ba:Cu=2:1:1 and mixed evenly to obtain a mixed powder of RE211 phase; Weigh out BaCO3 and CuO powders according to the molar ratio of Ba:Cu=3:5 and mix them evenly to obtain a mixed powder of Ba3Cu5O8 phase. Weigh out BaCO3 and CuO powders according to the molar ratio of Ba:Cu=1:1 and mix them evenly to obtain a mixed powder of BaCuO2 phase. Each mixed powder was sintered in air at 880℃~960℃ for 12h~24h and ground. The sintering and grinding process was repeated a total of 3 times to prepare precursor powders of RE123 phase, RE211 phase, Ba3Cu5O8 phase and BaCuO2 phase.

3. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 2, characterized in that, The process of preparing the solid precursor, liquid precursor, and support block in step two is selected from: The precursor powders of RE123 phase, RE211 phase and BaCuO2 phase were mixed evenly according to (a) RE123 + (20~30) mol% RE211, (b) RE211 or (c) RE2O3 + (1~2) BaCuO2 to obtain solid precursor powder. Then, the solid precursor powder was uniaxially pressed into a circular solid precursor with a diameter of Ф10mm~40mm using an alloy steel mold. The precursor powders of RE123 phase, Ba3Cu5O8 phase and BaCuO2 phase are mixed evenly in the following ways: (a) RE2O3+(1~2)Ba3Cu5O8, (b) RE123+(0.8~1.2)Ba3Cu5O8 or (c) RE2O3+(8~12) BaCuO2+6CuO to obtain liquid phase source powder. Then, the liquid phase precursor is uniaxially pressed into a circle with a diameter of Ф25mm~100mm or a square with a side length of 25mm~100mm using an alloy steel mold. The mass of the liquid precursor is 1.2 to 2 times the mass of the solid precursor; RE2O3 powder is pressed into circular support blocks with the same diameter / side length as the liquid phase precursor and a thickness of 3mm~5mm using an alloy steel mold.

4. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 1, characterized in that, In step three, multiple solid-phase precursors are placed above the liquid-phase precursor and evenly arranged. Then, support blocks and alumina pads are placed below the liquid-phase precursor in a manner that is aligned with the central axis.

5. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 1, characterized in that, The seed crystals mentioned in step four are selected from SmBCO and NdBCO single crystals obtained by cleaving from SmBCO and NdBCO bulk materials, as well as magnesium oxide crystals coated with SmBCO and NdBCO thin films.

6. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 1, characterized in that, In step four, the seed crystal-induced growth plane is placed horizontally on the top surface of the solid precursor to form a precursor composition. Then, it is placed in a heat treatment furnace for high-temperature sintering to prepare multiple REBCO single-domain bulk materials.

7. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 6, characterized in that, The high-temperature sintering process is as follows: the precursor composition is heated to 900℃~950℃ at a heating rate of 120℃ / h~180℃ / h and held for 3h~10h, exhausting the gas and reacting to generate the RE211 phase; then it is heated to 30℃~60℃ above the peritectic reaction temperature within 2h~3h and held for 30min~60min to melt the liquid phase precursor; then it is cooled to the peritectic reaction temperature at a cooling rate of 1℃ / h~60℃ / h; then it is cooled to 15℃~30℃ below the peritectic reaction temperature at a cooling rate of 0.2℃ / h~0.5℃ / h, during which the RE211 phase reacts with the Ba-Cu-O liquid phase to generate the RE123 phase; finally, it is cooled to room temperature within 15h~24h to obtain multiple single-domain REBCO bulk materials.

8. The method for efficient batch preparation of REBCO single-domain bulk materials according to claim 1, characterized in that, In step four, the RE in the REBCO single-domain bulk material is Y, Gd, Sm, Nd, or Eu.

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