Method for recycling and reusing rebco bulk seed crystal to grow superconducting bulk material

Abstract

A method for recycling and reusing an REBCO bulk seed crystal to grow a superconducting bulk material, relating to the technical field of superconducting material recycling, and comprising: preparing a first precursor body and a first buffer layer, processing an original REBCO seed crystal and the first precursor body on the basis of a top-seeded melt-textured growth method to obtain an original REBCO high-temperature superconducting bulk material; subsequently, cleaving the original bulk material in a specific manner to recover the REBCO seed crystal, and grinding and polishing the REBCO seed crystal; repeating the manufacturing process to obtain a second precursor body and a second buffer layer, and inserting the recycled seed crystal into the second precursor body for assembly; finally, reapplying the same top-seeded melt-textured growth method to process the assembled second precursor body to obtain an REBCO high-temperature superconducting bulk material grown by using the recycled seed crystal.

Description

A method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202410307195.8, filed with the Patent Office of China on March 18, 2024, entitled "A method for recycling and reusing REBCO bulk seed crystals for growing superconducting bulk materials," the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the technical field of superconducting material recycling, and in particular to a method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials. Background Art

[0004] The second major challenge in mass-producing high-temperature superconducting bulk materials is cost and quality control. Due to the complex manufacturing process, long production cycles, and low yields of REBCO (Rebco High-Temperature Superconducting Cobalt) bulk materials, a batch of qualified samples often yields a large number of failed samples. The expensive light rare earth elements contained in these samples are often wasted as waste. Therefore, the recycling of REBCO bulk materials has long been a research hotspot in this field.

[0005] In conventional processes, bulk seed crystals are usually peeled off from the top of the sample and discarded after the sample growth is completed, regardless of their expensive cost and complex preparation process. In addition to the cost issue, since the crystallinity of each seed crystal is not completely consistent, different seed crystals may require different temperature programs to prepare bulk materials. At the same time, the properties of the superconducting bulk materials induced by them may also vary greatly, which increases the trial and error cost and quality control cost of growing bulk materials. Therefore, in order to ensure that the superconducting properties of the samples are as consistent as possible to meet the needs of mass production, and to avoid the waste of bulk seed crystals containing expensive light rare earth elements in the preparation process of REBCO high-temperature superconducting bulk materials and thus reduce the preparation cost of REBCO bulk materials, a method for recycling and reusing REBCO bulk seed crystals is now needed. Summary of the Invention

[0006] The present invention aims to provide a method for recycling and reusing REBCO bulk seed crystals for growing superconducting bulk materials, thereby improving the above-mentioned problem. To achieve the above-mentioned object, the present invention adopts the following technical solutions:

[0007] The present application provides a method for recycling and reusing REBCO bulk seed crystals for growing superconducting bulk materials, comprising:

[0008] Prepare a first precursor body and a first buffer layer based on a preset REBCO high-temperature superconducting bulk material precursor body preparation method and a buffer layer preparation method;

[0009] Processing the REBCO original seed crystal, the first precursor embryo and the first buffer layer based on the top seed crystal melt texturing method to obtain an original REBCO high-temperature superconducting bulk material;

[0010] Cleaving the original REBCO high-temperature superconducting bulk material along a preset cleavage plane, and polishing the structure consisting of the first buffer layer and the REBCO seed crystal obtained by cleavage to obtain a recycled seed crystal;

[0011] Repeat the process to obtain a second precursor embryo and a second buffer layer, place the recycled seed crystal in the top center of the second precursor embryo, and coaxially insert the second buffer layer between the recycled seed crystal and the second precursor embryo to obtain an assembled second precursor embryo;

[0012] The assembled second precursor embryo is subjected to the same heat treatment as the first precursor embryo based on the top seed crystal melt texturing method to obtain a REBCO high-temperature superconducting bulk material grown by using recycled seed crystals.

[0013] Preferably, the step of preparing the first precursor body and the first buffer layer based on the preset precursor body preparation method and the buffer layer preparation method includes:

[0014] The raw materials were weighed according to the molar ratios of RE2O3:BaCO3:CuO=1:4:6 and 1:1:1, and mixed to prepare RE123 raw powder and RE211 raw powder respectively;

[0015] The RE123 raw powder and RE211 raw powder were prepared by solid phase sintering method to obtain purified RE123 powder and RE211 powder;

[0016] The purified RE123 powder and RE211 powder were weighed and mixed in a molar ratio of 1:0.35 to prepare a precursor powder, and 1 wt % of CeO2 powder was added to the precursor powder for mixing to obtain a precursor powder;

[0017] Weighing the precursor powder, placing it into a mold and pressing it to obtain a first precursor embryo;

[0018] The purified RE123 powder, RE211 powder and CeO2 powder are weighed according to a preset ratio, put into a mold and pressed to obtain a first buffer layer.

[0019] Preferably, the RE123 original powder and the RE211 original powder are prepared by a solid phase sintering method, comprising:

[0020] The RE123 raw powder was sintered in an air environment at 920° C. for 48 hours, and the RE211 raw powder was sintered in an air environment at 930° C. for 48 hours to obtain sintered RE123 powder blocks and RE211 powder blocks;

[0021] The sintered RE123 powder block and RE211 powder block are ground and sintered three times to obtain purified RE123 powder and RE211 powder.

[0022] Preferably, the purified RE123 powder, RE211 powder and CeO2 powder are weighed according to a preset ratio, and placed into a mold for pressing to obtain a first buffer layer, comprising:

[0023] The purified RE123 powder and the purified RE211 powder were mixed in a molar ratio of 5:2, and the mixed RE123 powder, RE211 powder and 1 wt % of CeO2 were mixed again to obtain a mixed powder;

[0024] The mixed powder was placed into a cylindrical mold with a diameter of 6 mm and subjected to pressure pressing to obtain a cylindrical first buffer layer.

[0025] Preferably, the preset REBCO original seed crystal, the first precursor embryo and the first buffer layer are processed based on the top seed crystal melt texturing method to obtain the original REBCO high-temperature superconducting bulk material, comprising:

[0026] Inserting the first buffer layer between the REBCO original seed crystal and the first precursor embryo to form a coaxial combined structure from top to bottom;

[0027] The combined structure is placed on an alumina ceramic plate and placed in a high-temperature furnace in an air atmosphere for texture growth, thereby obtaining an original YBCO high-temperature superconducting bulk material induced by REBCO original seed crystal growth.

[0028] Preferably, the first buffer layer is inserted between the REBCO original seed crystal and the first precursor embryo to form a coaxial combined structure from top to bottom, comprising:

[0029] A 3 mm × 3 mm × 3 mm REBCO original seed crystal with a smooth cross section was selected, and the ab surface of the bottom of the REBCO original seed crystal was polished to obtain a processed REBCO original seed crystal;

[0030] The center axis of the processed REBCO original seed crystal perpendicular to the ground is aligned with the center axis of the first buffer layer and the center axis of the first precursor embryo respectively, and the REBCO original seed crystal is placed between the first buffer layer and the first precursor embryo to obtain a coaxial combined structure.

[0031] Preferably, placing the combined structure on an alumina ceramic plate and placing the plate in a high-temperature furnace in an air atmosphere for texture growth comprises:

[0032] The temperature in the high-temperature furnace starts from room temperature and rises to 900°C after 1 hour and is kept at this temperature for 3 hours. Then, heating is continued for 1 hour, and the temperature in the high-temperature furnace is raised to 1055°C and is kept at this temperature for 1 hour.

[0033] The furnace temperature was lowered to 1005°C within 30 minutes, and then the furnace temperature was lowered at a cooling rate of 0.2K / h to 0.4K / h, so that the REBCO original seed crystal in the furnace induced the growth of the first precursor embryo for 100 hours;

[0034] After the sample growth was completed, the temperature of the high-temperature furnace was lowered to room temperature within 3 h.

[0035] Preferably, RE in the REBCO bulk seed crystal is selected from Y, Gd, Sm, and Nd.

[0036] Preferably, the cleaving of the original REBCO high-temperature superconducting bulk material along a preset cleavage plane comprises:

[0037] Cleaving the original REBCO high-temperature superconducting bulk material along the crystal ab plane using a cutting device to obtain a REBCO bulk seed crystal with a first buffer layer of 0.5 mm thickness, wherein the crystal ab plane direction is a layered cross-section of the bedding structure on the original REBCO high-temperature superconducting bulk material;

[0038] The cleavage surface of the REBCO bulk seed crystal was ground and polished with 1000-grit sandpaper to obtain a REBCO recycling seed crystal.

[0039] Preferably, after obtaining the REBCO high-temperature superconducting bulk material grown using the recycled seed crystals, the method further comprises:

[0040] Recovering the seed crystals on the REBCO high-temperature superconducting bulk material grown using the recycled seed crystals, and performing grinding and polishing on the REBCO high-temperature superconducting bulk material grown using the recycled seed crystals and the original REBCO high-temperature superconducting bulk material to obtain two completed grown bulk materials;

[0041] The two grown bulk materials were placed in a high-temperature furnace with a flowing oxygen atmosphere for annealing at a temperature of 450°C for 200 hours, thereby obtaining two REBCO high-temperature superconducting bulk materials that had completed the annealing process.

[0042] Two REBCO high-temperature superconducting bulk materials that have completed the annealing process are subjected to a magnetic levitation force test, and the magnetic levitation force test results of the two REBCO high-temperature superconducting bulk materials that have completed the annealing process are obtained.

[0043] The beneficial effects of the present invention are:

[0044] The method of the present invention can realize a lossless seed crystal recovery process, and can successfully grow a block material with good morphology each time, and can realize as many seed crystal recovery times as possible. Through the present invention, REBCO high-temperature superconducting block materials can be repeatedly prepared from two aspects of growth morphology and magnetic levitation performance. In addition, the present invention ensures the relative position between the seed crystal and the solid solution by virtue of the property that the solid solution can maintain its own shape in the molten state, and reliably realizes the effect of repeatedly guiding the growth of the precursor embryo below.

[0045] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0047] FIG1 is a schematic flow chart of a method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to an embodiment of the present invention;

[0048] FIG2 is a schematic diagram of the magnetic levitation force test results of a superconducting bulk material grown by recycling and reusing REBCO bulk seed crystals according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0051] Example 1:

[0052] This embodiment provides a method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials.

[0053] 1 and 2 , it is shown that the method includes step S1 , step S2 , step S3 , step S4 and step S5 .

[0054] Step S1: preparing a first precursor body and a first buffer layer based on a preset method for preparing a precursor body and a buffer layer of a REBCO high-temperature superconducting bulk material;

[0055] It can be understood that this step provides a precursor body and buffer layer with good crystallinity and density, providing an ideal base material and substrate for subsequent superconductor growth. This helps improve the crystallization quality and performance of the superconductor material, thereby improving the performance and stability of the overall superconducting bulk material. In this step, step S1 includes steps S11, S12, S13, S14, and S15.

[0056] Step S11, weighing the original drugs according to the molar ratios of RE2O3:BaCO3:CuO=1:4:6 and 1:1:1, and mixing them respectively to prepare RE123 original powder and RE211 original powder;

[0057] Step S12: preparing the RE123 original powder and the RE211 original powder by a solid phase sintering method to obtain purified RE123 powder and RE211 powder;

[0058] It can be understood that step S12 also includes step S121 and step S122.

[0059] Step S121, sintering the RE123 raw powder in an air environment at 920° C. for 48 hours, and sintering the RE211 raw powder in an air environment at 930° C. for 48 hours, to obtain sintered RE123 powder blocks and RE211 powder blocks;

[0060] Step S122: Grind and sinter the sintered RE123 powder block and RE211 powder block, repeating the process three times to obtain purified RE123 powder and RE211 powder.

[0061] It can be understood that in this step, the original powder is sintered for a long time under specific temperature and environmental conditions to promote the bonding between powder particles and the growth of crystals, and finally sintered RE123 powder blocks and RE211 powder blocks are obtained. Through sintering and grinding treatment, the purity and crystal structure of the powder are improved, providing high-quality raw materials for the subsequent superconductor preparation process.

[0062] Step S13, weighing and mixing the purified RE123 powder and RE211 powder in a molar ratio of 1:0.35 to prepare a precursor powder, and adding 1 wt % of CeO2 powder to the precursor powder for mixing to obtain a precursor powder;

[0063] Step S14: weighing the precursor powder, placing it into a mold and pressing it to obtain a first precursor embryo;

[0064] Step S15: weigh the purified RE123 powder, RE211 powder and CeO2 powder according to a preset ratio, put them into a mold and press them to obtain a first buffer layer.

[0065] It can be understood that in this step, step S15 includes step S151 and step S152.

[0066] Step S151, mixing the purified RE123 powder and the purified RE211 powder in a molar ratio of 5:2, and mixing the mixed RE123 powder, RE211 powder and 1 wt% of CeO2 again to obtain a mixed powder;

[0067] Step S152: placing the mixed powder into a cylindrical mold with a diameter of 6 mm and performing pressurization to obtain a cylindrical first buffer layer.

[0068] It can be understood that the above steps utilize solid-phase sintering and powder metallurgy technology, precisely controlling the molar ratios of the raw materials and process conditions to produce a precursor powder with the desired composition and structure, and then forming the first precursor body and the first buffer layer through a pressing process. This step precisely controls the molar ratios of the raw materials and process conditions to produce a precursor powder with the desired composition and structure, and then forms the first precursor body and the first buffer layer through a pressing process, providing an excellent base material and support structure for the subsequent superconductor growth process.

[0069] Step S2: processing the REBCO original seed crystal, the first precursor embryo and the first buffer layer based on the top seed crystal melt texturing method to obtain an original REBCO high-temperature superconducting bulk material;

[0070] It can be understood that this step utilizes the guiding effect of the top seed crystal to grow a single crystal superconductor layer on its surface through melt texturing, thus forming the original REBCO high-temperature superconducting bulk material. This method can effectively control the growth quality and thickness of the superconductor layer, improving the crystallization performance and uniformity of the material. In this step, step S2 includes steps S21 and S22.

[0071] Step S21: inserting the first buffer layer between the REBCO original seed crystal and the first precursor embryo to form a coaxial combined structure from top to bottom;

[0072] It can be understood that in this step, step S21 includes step S211 and step S212.

[0073] Step S211: Select a 3 mm × 3 mm × 3 mm REBCO original seed crystal with a smooth cross section, and polish the bottom ab surface of the REBCO original seed crystal to obtain a processed REBCO original seed crystal;

[0074] Step S212: Align the central axis of the processed REBCO original seed crystal perpendicular to the ground with the central axis of the first buffer layer and the central axis of the first precursor embryo respectively, and place the REBCO original seed crystal between the first buffer layer and the first precursor embryo to obtain a coaxial combined structure.

[0075] It is understood that the purpose of polishing the REBCO seed crystal in this step is to eliminate any surface defects and roughness, ensuring that the REBCO seed crystal can tightly bond with other components during the subsequent assembly and growth process and providing a good growth surface. This polishing process reduces surface unevenness, further ensures crystal orientation, and improves uniformity and stability during the growth process. The surface treatment of the REBCO seed crystal and the formation of the coaxial composite structure lay the foundation for the subsequent textured growth process. The smooth surface after treatment facilitates crystal growth and improves quality during the growth process, while the coaxial composite structure ensures tight bonding and stability between the components, facilitating the progress and control of the growth process.

[0076] Step S22: placing the combined structure on an alumina ceramic plate, and placing it in a high-temperature furnace in an air atmosphere for texture growth, to obtain an original YBCO high-temperature superconducting bulk material induced by REBCO original seed crystal growth.

[0077] It can be understood that this step, through crystal texture growth technology, achieves induced growth of the REBCO superconducting bulk material from the original seed crystal, thereby obtaining a REBCO high-temperature superconducting bulk material with excellent superconducting properties. This method can control the crystal orientation and superconducting properties of the superconductor during the preparation process, thereby improving the application value of the material. In this step, step S22 includes steps S221, S222, and S223.

[0078] Step S221: The temperature in the high-temperature furnace is raised from room temperature to 900°C over 1 hour and kept at this temperature for 3 hours. The temperature is then further heated for 1 hour, and the temperature in the high-temperature furnace is raised to 1055°C and kept at this temperature for 1 hour.

[0079] Step S222: lowering the furnace temperature to 1005° C. within 30 minutes, and then lowering the furnace temperature at a cooling rate of 0.2 K / h to 0.4 K / h, so that the REBCO original seed crystals in the furnace induce the growth of the first precursor embryo for 100 hours;

[0080] Step S223: After the sample growth is completed, the temperature of the high-temperature furnace is lowered to room temperature within 3 hours.

[0081] It will be appreciated that this step promotes the growth of the REBCO primary seed crystal by controlling temperature and time, ultimately yielding the desired superconducting bulk. Through these steps, precise control and stability of the REBCO primary seed crystal growth process are achieved. Appropriate temperature and time control promotes crystal formation and growth, resulting in a superconducting bulk with excellent crystalline quality and performance. Furthermore, by controlling the cooling rate and temperature variation, crystallization inhomogeneity and deformation during the growth process can be avoided, ensuring excellent uniformity and stability in the resulting superconducting bulk.

[0082] Step S3, cleaving the original REBCO high-temperature superconducting bulk material along a preset cleavage plane, and polishing the structure consisting of the first buffer layer and the REBCO seed crystal obtained by cleavage to obtain a recycled seed crystal;

[0083] This step can effectively recycle the seed crystals in the original REBCO bulk material, providing high-quality seed crystals for the subsequent growth process, thereby helping to improve the quality and uniformity of the newly grown superconductor material. The REBCO seed crystal recovery method of the present invention is based on the TSMG method. During the cleavage process, it is necessary to carefully determine the crystal orientation and use a suitable method to accurately cleave the seed crystal-buffer layer structure. The cleavage surface of the structure composed of the first buffer layer and the REBCO seed crystal obtained by cleavage is polished to ensure that the REBCO recycled seed crystal has a natural crystal orientation each time it is reused, correctly guiding the texture of the precursor embryo during the growth process. Step S3 includes step S31 and step S32.

[0084] Step S31: using a cutting device to cleave the original REBCO high-temperature superconducting bulk material along the crystal ab plane direction to obtain a REBCO bulk seed crystal with a first buffer layer of 0.5 mm thickness, wherein the crystal ab plane direction is a layered cross-section of the bedding structure on the original REBCO high-temperature superconducting bulk material;

[0085] Step S32: grinding and polishing the cleavage surface of the REBCO bulk seed crystal with 1000-grit sandpaper to obtain a REBCO recovery seed crystal.

[0086] It can be understood that in this step, the original REBCO high-temperature superconducting bulk material is cleaved along the ab plane direction of the crystal, that is, the layered cross-section of the crystal's bedding structure, by using a cutting device to obtain a REBCO bulk seed crystal with a first buffer layer of 0.5 mm thickness. The purpose of this step is to separate the bulk seed crystal with a certain buffer layer thickness from the original bulk material for subsequent recycling and reuse. It can be understood that in this step, the bulk seed crystal with a certain buffer layer thickness is obtained by effectively separating and processing the original REBCO high-temperature superconducting bulk material, and the cleavage surface thereof is smoothed and uniformly processed. Such treatment can ensure that the recovered seed crystal has good surface quality and morphology, can effectively participate in the subsequent growth process, thereby realizing the effective reuse of the REBCO bulk seed crystal.

[0087] Step S4, repeating the process to obtain a second precursor embryo and a second buffer layer, placing the recycled seed crystal at the top center of the second precursor embryo, and coaxially inserting the second buffer layer between the recycled seed crystal and the second precursor embryo to obtain an assembled second precursor embryo;

[0088] It can be understood that this step provides an ideal base material and substrate for the next step of superconductor growth. At the same time, by utilizing the recycled seed crystals, production costs are reduced and resource utilization efficiency is improved.

[0089] Step S5: performing the same heat treatment as the first precursor embryo on the assembled second precursor embryo based on the top seed melt texturing method to obtain a REBCO high-temperature superconducting bulk material grown using recycled seed crystals.

[0090] It can be understood that the RE in the REBCO bulk seed crystal in this step is selected from Y, Gd, Sm, and Nd, and step S5 also includes step S6 and step S7.

[0091] Step S6: sending the two grown bulk materials into a high-temperature furnace with a flowing oxygen atmosphere for annealing, wherein the annealing temperature is 450° C. and the annealing time is 200 hours, to obtain two REBCO high-temperature superconducting bulk materials that have completed the annealing process;

[0092] Step S7: Perform a magnetic levitation force test on the two REBCO high-temperature superconducting bulk materials that have completed the annealing process to obtain magnetic levitation force test results of the two REBCO high-temperature superconducting bulk materials that have completed the annealing process.

[0093] It can be understood that this step is to place the block in a high-temperature furnace and anneal it at a temperature of 450°C in a flowing oxygen atmosphere for 200 hours. The purpose of the annealing treatment is to achieve a transformation in the crystal structure of the block so that it can obtain superconductivity. The annealing treatment can achieve a transformation in the crystal structure of the block so that it can obtain superconductivity, and improve its superconducting performance and stability. The magnetic levitation force test can accurately evaluate the superconducting performance of the block, ensure that it meets the design requirements, and judge the changes in its magnetic levitation force. As shown in Figure 2, the magnetic levitation performance of the original REBCO high-temperature superconducting block and the REBCO high-temperature superconducting block grown using recycled seed crystals are highly consistent. It can be seen that the present invention can repeatedly prepare REBCO high-temperature superconducting blocks from two aspects: growth morphology and magnetic levitation force performance.

[0094] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0095] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for recycling and reusing REBCO bulk seed crystals for growing superconducting bulk materials, characterized in that: include: Prepare a first precursor body and a first buffer layer based on a preset REBCO high-temperature superconducting bulk material precursor body preparation method and a buffer layer preparation method; Processing the REBCO original seed crystal, the first precursor embryo and the first buffer layer based on the top seed crystal melt texturing method to obtain an original REBCO high-temperature superconducting bulk material; Cleaving the original REBCO high-temperature superconducting bulk material along a preset cleavage plane, and polishing the structure consisting of the first buffer layer and the REBCO seed crystal obtained by cleavage to obtain a recycled seed crystal; Repeat the process to obtain a second precursor embryo and a second buffer layer, place the recycled seed crystal in the top center of the second precursor embryo, and coaxially insert the second buffer layer between the recycled seed crystal and the second precursor embryo to obtain an assembled second precursor embryo; performing the same heat treatment as the first precursor embryo on the assembled second precursor embryo based on the top seed melt texturing method to obtain a REBCO high-temperature superconducting bulk material grown using recycled seed crystals; The process of processing the preset REBCO original seed crystal, the first precursor embryo and the first buffer layer based on the top seed crystal melt texturing method to obtain the original REBCO high-temperature superconducting bulk material includes: Inserting the first buffer layer between the REBCO original seed crystal and the first precursor embryo to form a coaxial combined structure from top to bottom; Placing the combined structure on an alumina ceramic plate and placing it in a high-temperature furnace in an air atmosphere for texture growth to obtain a raw YBCO high-temperature superconducting bulk material induced by REBCO raw seed crystals; The first buffer layer is inserted between the REBCO original seed crystal and the first precursor embryo to form a coaxial combined structure from top to bottom, including: A 3 mm × 3 mm × 3 mm REBCO original seed crystal with a smooth cross section was selected, and the ab surface of the bottom of the REBCO original seed crystal was polished to obtain a processed REBCO original seed crystal; Aligning the central axis of the processed REBCO original seed crystal perpendicular to the ground with the central axis of the first buffer layer and the central axis of the first precursor embryo respectively, and placing the REBCO original seed crystal between the first buffer layer and the first precursor embryo to obtain a coaxial combined structure; The step of cleaving the original REBCO high-temperature superconducting bulk material along a preset cleavage plane includes: Cleaving the original REBCO high-temperature superconducting bulk material along the crystal ab plane using a cutting device to obtain a REBCO bulk seed crystal with a first buffer layer of 0.5 mm thickness, wherein the crystal ab plane direction is a layered cross-section of the bedding structure on the original REBCO high-temperature superconducting bulk material; The cleavage surface of the REBCO bulk seed crystal was ground and polished with 1000-grit sandpaper to obtain a REBCO recycling seed crystal.

2. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 1, characterized in that The method of preparing the first precursor embryo and the first buffer layer based on the preset precursor embryo preparation method and the buffer layer preparation method includes: The raw materials were weighed according to the molar ratios of RE2O3:BaCO3:CuO=1:4:6 and 1:1:1, and mixed to prepare RE123 raw powder and RE211 raw powder respectively; The RE123 raw powder and RE211 raw powder were prepared by solid phase sintering method to obtain purified RE123 powder and RE211 powder; The purified RE123 powder and RE211 powder were weighed and mixed in a molar ratio of 1:0.35 to prepare a precursor powder, and 1 wt % of CeO2 powder was added to the precursor powder for mixing to obtain a precursor powder; Weighing the precursor powder, placing it into a mold and pressing it to obtain a first precursor embryo; The purified RE123 powder, RE211 powder and CeO2 powder are weighed according to a preset ratio, put into a mold and pressed to obtain a first buffer layer.

3. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 2, characterized in that ,RE123 original powder and RE211 original powder were prepared by solid phase sintering method, including: The RE123 raw powder was sintered in an air environment at 920° C. for 48 hours, and the RE211 raw powder was sintered in an air environment at 930° C. for 48 hours to obtain sintered RE123 powder blocks and RE211 powder blocks; The sintered RE123 powder block and RE211 powder block are ground and sintered three times to obtain purified RE123 powder and RE211 powder.

4. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 2, characterized in that The purified RE123 powder, RE211 powder and CeO2 powder are weighed according to a preset ratio and placed into a mold for pressing to obtain a first buffer layer, comprising: The purified RE123 powder and the purified RE211 powder were mixed in a molar ratio of 5:2, and the mixed RE123 powder, RE211 powder and 1 wt % CeO2 powder were mixed again to obtain a mixed powder; The mixed powder was placed into a cylindrical mold with a diameter of 6 mm and subjected to pressure pressing to obtain a cylindrical first buffer layer.

5. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 1, characterized in that: Placing the combined structure on an alumina ceramic plate and placing the combined structure in a high-temperature furnace in an air atmosphere for texture growth includes: The temperature in the high-temperature furnace starts from room temperature and rises to 900°C after 1 hour and is kept at this temperature for 3 hours. Then, heating is continued for 1 hour, and the temperature in the high-temperature furnace is raised to 1055°C and is kept at this temperature for 1 hour. The furnace temperature was lowered to 1005°C within 30 minutes, and then the furnace temperature was lowered at a cooling rate of 0.2K / h to 0.4K / h, so that the REBCO original seed crystal in the furnace induced the growth of the first precursor embryo for 100 hours; After the sample growth was completed, the temperature of the high-temperature furnace was lowered to room temperature within 3 h.

6. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 1, characterized in that: The RE in the REBCO bulk seed crystal is selected from Y, Gd, Sm, and Nd.

7. The method for recycling and reusing REBCO bulk seed crystals to grow superconducting bulk materials according to claim 1, characterized in that: After obtaining the REBCO high-temperature superconducting bulk material grown by using the recycled seed crystal, the method further includes: Recovering the seed crystals on the REBCO high-temperature superconducting bulk material grown using the recycled seed crystals, and performing grinding and polishing on the REBCO high-temperature superconducting bulk material grown using the recycled seed crystals and the original REBCO high-temperature superconducting bulk material to obtain two completed grown bulk materials; The two grown bulk materials were placed in a high-temperature furnace with a flowing oxygen atmosphere for annealing at a temperature of 450°C for 200 hours, thereby obtaining two REBCO high-temperature superconducting bulk materials that had completed the annealing process. Two REBCO high-temperature superconducting bulk materials that have completed the annealing process are subjected to a magnetic levitation force test, and the magnetic levitation force test results of the two REBCO high-temperature superconducting bulk materials that have completed the annealing process are obtained.

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