Multilayer YBCO superconducting tape preparation device and preparation method

Abstract

The present invention discloses a multilayer YBCO superconducting tape preparation device and preparation method, which relate to the field of superconducting tape preparation. The multilayer YBCO superconducting tape preparation device and preparation method provided by the present invention both wind two superconducting tapes on a cylinder, and by tightening the two superconducting tapes on the cylinder, the application of a pre-tightening force between the two superconducting tape bodies is realized. With such an arrangement, the multilayer YBCO superconducting tape preparation device and preparation method can prepare a longer tape, and the length of the superconducting tape body does not need to be consistent with the length of the device, and the flexibility is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of superconducting tape preparation, and in particular to a multi-layer YBCO superconducting tape preparation device and preparation method. Background Art

[0002] In the past few decades, YBCO (YBa2Cu3O 7-δ As the second generation of high-temperature superconducting tape, the tape has developed rapidly and its preparation process has matured because its performance under high fields is significantly better than other superconductors. The critical current of YBCO tape has been continuously improved in domestic and foreign companies. The current solutions to improve the critical current of YBCO tape are: by stacking multiple layers of YBCO film on the base tape, the current carrying capacity of the superconducting tape can be significantly enhanced. In the technology of stacking multiple layers of YBCO film on the base tape, there is a very important process. The two superconducting tapes need to be heated face to face and close together, which requires the application of a preload.

[0003] The existing technology is to apply preload by extruding superconducting tapes through linear tooling. The problem is that the linear tooling can only prepare short samples (about ten centimeters). If the sample length continues to increase, the length of the tooling also needs to change accordingly. In addition, in order to ensure that the workpiece does not deform, the length of the prepared superconducting wire needs to be consistent with the length of the tooling, which lacks flexibility. Therefore, how to provide a multi-layer YBCO superconducting tape preparation device and preparation method that can prepare long samples and has good flexibility has become a problem that technicians in this field urgently need to solve. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-layer YBCO superconducting tape preparation device and preparation method which can prepare long samples and has good flexibility.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The invention provides a multilayer YBCO superconducting tape preparation device, comprising: a bolt, wherein the bolt comprises a coaxially arranged column and two thread segments, wherein the two thread segments are respectively arranged at two ends of the column; a nut assembly, wherein the nut assembly comprises two precession nuts, wherein the two precession nuts are respectively threadedly connected with the two thread segments, and each of the precession nuts is provided with a first clamping block; and a connecting assembly, wherein the connecting assembly comprises two second clamping blocks, wherein the two first clamping blocks correspond to the two second clamping blocks one by one and are detachably connected.

[0007] Preferably, the multi-layer YBCO superconducting tape preparation device also includes a high-temperature resistant pre-tensioning tape. The superconducting base tape, the superconducting tape and the high-temperature resistant pre-tensioning tape are aligned and wound around the column. The high-temperature resistant pre-tensioning tape is arranged on the outermost side, and both ends of the high-temperature resistant pre-tensioning tape are clamped between the first clamping block and the second clamping block.

[0008] Preferably, the column includes a main body and two fixing blocks, both ends of the main body are provided with grooves, the two fixing blocks are respectively arranged in the two grooves, and each of the fixing blocks is detachably connected to the main body.

[0009] Preferably, the fixing block and the groove have the same shape.

[0010] Preferably, the surface of the high temperature resistant pretensioning belt is smooth.

[0011] Preferably, the high temperature resistant pre-tensioning belt is a Hastelloy substrate or a stainless steel belt.

[0012] Preferably, one of the first clamping block and the second clamping block is provided with a slot matching the other, and the other is embedded in the slot.

[0013] Preferably, the surface of the cylinder is smooth.

[0014] The invention provides a method for preparing a multilayer YBCO superconducting tape, comprising the following steps: step 1, aligning a superconducting base tape and a superconducting tape to form a superconducting tape body, and winding the superconducting tape body on a column; step 2, screwing the superconducting tape body on the column, during which the superconducting base tape and the superconducting tape are pressed against each other to complete pre-tightening.

[0015] Preferably, the method for preparing a multilayer YBCO superconducting tape comprises the following steps: in the step one, a high temperature resistant pre-tensioning tape is provided, and the high temperature resistant pre-tensioning tape is aligned with the superconducting tape body and then wound around a column, with the high temperature resistant pre-tensioning tape being wound on the outermost side; in the step two, the two ends of the high temperature resistant pre-tensioning tape are stretched so that the superconducting tape body is tightened on the column.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The multilayer YBCO superconducting tape preparation device provided by the present invention comprises: a bolt, which comprises a coaxially arranged column and two threaded segments, and the two threaded segments are respectively arranged at two ends of the column; a nut assembly, which comprises two precession nuts, and the two precession nuts are respectively threadedly connected with the two threaded segments, and each precession nut is provided with a first clamping block; a connecting assembly, which comprises two second clamping blocks, and the two first clamping blocks correspond to the two second clamping blocks one by one and are detachably connected.

[0018] The method for preparing a multilayer YBCO superconducting tape provided by the present invention comprises the following steps: step 1, aligning a superconducting base tape and a superconducting tape to form a superconducting tape body, and winding the superconducting tape body on a column; step 2, screwing the superconducting tape body on the column, during which the superconducting base tape and the superconducting tape are squeezed against each other to complete pre-tightening.

[0019] The multi-layer YBCO superconducting tape preparation device and preparation method both wind two superconducting tape bodies on a column, and by tightening the two superconducting tape bodies on the column, a pre-tightening force is applied between the two superconducting tape bodies. With such an arrangement, the multi-layer YBCO superconducting tape preparation device and preparation method can prepare a longer tape, and the length of the superconducting tape body does not need to be consistent with the length of the device, which greatly improves flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a multi-layer YBCO superconducting tape preparation device provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of bolts in a multi-layer YBCO superconducting tape preparation device provided in an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a precession nut of a multi-layer YBCO superconducting tape preparation device provided in an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of a second clamping plate of a multi-layer YBCO superconducting tape preparation device provided in an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a fixing block of a multi-layer YBCO superconducting tape preparation device provided in an embodiment of the present invention;

[0026] Figure 6 A diagram showing a method for preparing a multi-layer YBCO superconducting tape;

[0027] Figure 7 This is the voltage-current curve of the superconducting tape.

[0028] Explanation of the reference numerals in the accompanying drawings: 100, a multi-layer YBCO superconducting tape preparation device; 1, a cylinder; 101, a main body; 102, a fixing block; 103, a groove; 2, a threaded section; 3, a precession nut; 4, a first clamping block; 5, a second clamping block; 501, a slot; 6, a superconducting tape; 601, a silver layer; 602, a YBCO superconducting layer; 603, a buffer layer; 604, a Hastelloy substrate; 7, a superconducting tape body; 8, a multi-layer YBCO superconducting tape. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide a multilayer YBCO superconducting tape preparation device and preparation method which can prepare long samples and has good flexibility.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Embodiment 1

[0033] refer to Figure 1-Figure 4 As shown, a multilayer YBCO superconducting tape preparation device 100 provided in this embodiment includes: a bolt, which includes a coaxially arranged column 1 and two thread segments 2, and the two thread segments 2 are respectively arranged at both ends of the column 1; a nut assembly, which includes two precession nuts 3, and the two precession nuts 3 are respectively threadedly connected with the two thread segments 2, and each precession nut 3 is provided with a first clamping block 4; a connecting assembly, which includes two second clamping blocks 5, and the two first clamping blocks 4 correspond to the two second clamping blocks 5 one by one and can be detachably connected. The multilayer YBCO superconducting tape preparation device 100 can prepare a longer tape, and the length of the superconducting tape body 7 does not need to be consistent with the length of the device, and has good flexibility.

[0034] In the specific use process, the superconducting base tape and the superconducting tape 6 are aligned to form a superconducting tape body 7, and the superconducting tape body 7 is wound on the column 1. The two ends of the superconducting tape body 7 correspond to a first clamping block 4 and a second clamping block 5, respectively, and the two ends of the superconducting tape body 7 are respectively clamped between the corresponding first clamping block 4 and the second clamping block 5. After the clamping is completed, the two precession nuts 3 are rotated. As the precession nuts 3 rotate, the superconducting tape body 7 is tightened on the column 1, and the more it is rotated, the tighter it is. During the tightening process of the superconducting tape body 7, the superconducting base tape and the superconducting tape 6 are pre-tightened accordingly, and the magnitude of the pre-tightening force is related to the tightening degree of the superconducting tape body 7.

[0035] It should be noted that the superconducting base tape has the same structure as the superconducting tape 6 , or a multi-layer YBCO superconducting tape 8 formed by stacking YBCO thin films is selected as the superconducting base tape to be stacked with the new superconducting tape 6 .

[0036] In this embodiment, in order to improve the clamping effect, one of the first clamping block 4 and the second clamping block 5 is provided with a slot 501 matching the other, and the other is embedded in the slot 501. Specifically, in this embodiment, Figure 4 As shown, a clamping slot 501 is provided on the second clamping block 5 .

[0037] In this embodiment, the first clamping block 4 and the second clamping block 5 are connected by a first screw.

[0038] In this embodiment, the surface of the column 1 is smooth.

[0039] In this embodiment, the nut assembly also includes two locking nuts, which are threadedly connected to the two threaded segments 2 respectively. The two locking nuts correspond to the two precession nuts 3 one by one, and each locking nut is used to lock the corresponding precession nut 3 respectively.

[0040] Embodiment 2

[0041] The multilayer YBCO superconducting tape preparation device 100 provided in this embodiment includes some or all of the features of the first embodiment, except that the multilayer YBCO superconducting tape preparation device 100 provided in this embodiment also includes a high-temperature resistant pre-tightening tape, and the superconducting base tape, the superconducting tape 6 and the high-temperature resistant pre-tightening tape are aligned and then wound on the column 1, wherein the superconducting base tape and the superconducting tape 6 are aligned face to face (the three are wound at the same time, and the winding process does not overlap), the high-temperature resistant pre-tightening tape is arranged on the outermost side (one of the superconducting base tape or the superconducting tape 6 is always in contact with the surface of the column 1), and both ends of the high-temperature resistant pre-tightening tape are clamped between the first clamping block 4 and the second clamping block 5.

[0042] The width and length of the superconducting base tape and the superconducting tape 6 are the same, both ends of the high temperature resistant pre-tightening belt are longer than the superconducting base tape and the superconducting tape 6, and the width of the high temperature resistant pre-tightening belt is equal to the width of the superconducting base tape and the superconducting tape 6. In the specific use process, the parts of the two ends of the high temperature resistant pre-tightening belt that are longer than the superconducting base tape and the superconducting tape 6 are clamped between the first clamping block 4 and the second clamping block 5. It should be noted that the parts of the two ends of the high temperature resistant pre-tightening belt that are longer than the superconducting base tape and the superconducting tape 6 are respectively clamped between different first clamping blocks 4 and second clamping blocks 5. By pre-tightening the superconducting base tape and the superconducting tape 6 with the high temperature resistant pre-tightening belt, the pre-tightening effect of the superconducting base tape and the superconducting tape 6 is better.

[0043] In this embodiment, the surface of the high temperature resistant pre-tensioning belt is smooth.

[0044] In this embodiment, the high temperature resistant pre-tensioning belt is a Hastelloy substrate 604 or a stainless steel belt. It should be noted that the high temperature resistant pre-tensioning belt is not limited to a Hastelloy substrate 604 or a stainless steel belt, and the Hastelloy substrate 604 and the stainless steel belt are only examples.

[0045] Embodiment 3

[0046] The multi-layer YBCO superconducting tape preparation device 100 provided in this embodiment includes some or all of the features of the second embodiment, except that: Figure 2 and Figure 5 As shown, the column 1 includes a main body 101 and two fixing blocks 102 . Grooves 103 are provided at both ends of the main body 101 . The two fixing blocks 102 are respectively disposed in the two grooves 103 . Each fixing block 102 is detachably connected to the main body 101 .

[0047] During specific use, the parts of the two ends of the high-temperature resistant pre-tightening belt that are longer than the superconducting base tape and the superconducting tape 6 are clamped between the first clamping block 4 and the second clamping block 5, and the two ends of the superconducting tape body 7 correspond to a groove 103 and a fixed block 102 respectively, and the two ends of the superconducting tape body 7 are respectively clamped between their corresponding grooves 103 and fixed blocks 102.

[0048] In this embodiment, the fixing block 102 and the groove 103 have the same shape.

[0049] In this embodiment, the fixing block 102 and the groove 103 are connected by screws.

[0050] The principles of the multi-layer YBCO superconducting tape preparation device 100 provided in the above-mentioned embodiments 1 to 3 are as follows:

[0051] The precession nut 3 is rotated and precessed on the bolt to convert the rotational force into a tension force on the tape, and then into a pressure on the superconducting tape 6, so as to achieve the pressure for peeling the superconducting tape 6.

[0052] Embodiment 4

[0053] This embodiment provides a method for preparing a multilayer YBCO superconducting tape 8, which comprises the following steps:

[0054] Step 1: align the superconducting base tape and the superconducting tape 6 to form a superconducting tape body 7, and wind the superconducting tape body 7 on the column 1;

[0055] Step 2: tighten the superconducting tape 7 onto the column 1. During the tightening process, the two superconducting tapes 6 are pressed against each other to complete the pre-tightening.

[0056] In this embodiment, the method for preparing the multilayer YBCO superconducting tape 8 includes the following steps:

[0057] In step 1, a high temperature resistant pre-tightening belt is provided, and the high temperature resistant pre-tightening belt is aligned with the superconducting belt body 7 and then wound on the column 1, and the high temperature resistant pre-tightening belt is wound on the outermost side;

[0058] In step 2, the two ends of the high temperature resistant pre-tightening tape are stretched so that the superconducting tape body 7 is screwed tightly onto the column 1 .

[0059] In this embodiment, the method for preparing the multi-layer YBCO superconducting tape 8 further includes the following steps:

[0060] Step three, after pre-tightening is completed, there is no need to remove the superconducting tape 7. The column 1, the pre-tightened superconducting tape 7 and the high-temperature resistant pre-tightening tape are placed in a high-temperature furnace for heating, which can promote the separation of the superconducting layer and the buffer layer 603 of the superconducting tape 6, thereby preparing a superconducting tape 6 with multiple YBCO superconducting layers 602.

[0061] If you need to explain Figure 6 As shown, the existing superconducting tape 6 includes a silver layer 601, a YBCO superconducting layer 602, a buffer layer 603 and a Hastelloy substrate 604 arranged in sequence from top to bottom. When preparing the existing multi-layer YBCO superconducting tape 8, after aligning two superconducting tapes 6, a certain pre-tightening force (determined according to actual needs) is applied to squeeze the two superconducting tapes 6 so that the two superconducting tapes 6 are close together. Then, the two superconducting tapes 6 close together are placed in a high-temperature furnace for heating. After the heating is completed, the YBCO superconducting layer 602 and the buffer layer 603 can be separated after cooling for a period of time (the bonding force between the YBCO superconducting layer 602 and the buffer layer 603 is weaker than the bonding force between the buffer layer 603 and the Hastelloy substrate 604). After the buffer layer 603 and the Hastelloy substrate 604 of the superconducting tape 6 are peeled off, the multi-layer YBCO superconducting tape 8 can be formed. The formed multi-layer YBCO superconducting tape 8 can be used as a superconducting base tape and re-stacked with a new superconducting tape 6.

[0062] The present invention is further described below in conjunction with experiments. The multi-layer YBCO superconducting tape 8 selected in this experiment is formed by stacking two superconducting tapes 6 from which a buffer layer 603 and a Hastelloy substrate 604 are peeled off.

[0063] Experimental process and results:

[0064] After silver plating and annealing, the current carrying capacity of the multilayer YBCO superconducting tape 8 was tested. It is known that the critical current of a single-layer YBCO superconducting tape at 77K (liquid nitrogen temperature range) is about 130A (4mm wide). The critical current of the multilayer YBCO superconducting tape 8 was measured to be about 210A (4mm wide), and the tape performance was significantly improved.

[0065] Experimental principle:

[0066] The critical current test of the multilayer YBCO superconducting tape 8 uses the “four-lead method” to measure the voltage-current curve of the superconducting tape, such as Figure 7 As shown, due to being in the superconducting state, the normal voltage-current curve is a straight line, and the slope represents the resistance of the multilayer YBCO superconducting tape 8. When the critical current of the multilayer YBCO superconducting tape 8 is exceeded, a quench phenomenon will occur, that is, the voltage-current slope increases significantly, and the current value at this time is the critical current of the multilayer YBCO superconducting tape 8 under the self-field. YBCO is a high-temperature superconductor and can reach the superconducting state at liquid nitrogen temperature (77K). For this reason, this experiment was also carried out under the self-field of 77K.

[0067] The experimental results show that the slope of the voltage-current curve of the superconducting tape increases significantly, indicating that the critical current value of the multilayer YBCO superconducting tape 8 is reached at this time. The analysis of the voltage-current shows that the critical current of the multilayer YBCO superconducting tape 8 is >210A, and the tape performance is significantly improved. The present invention has been experimentally verified and successfully prepared the multilayer YBCO superconducting tape 8.

[0068] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A multi-layer YBCO superconducting tape preparation device, characterized in that: include: A bolt, comprising a coaxially arranged column and two threaded sections, wherein the two threaded sections are respectively arranged at two ends of the column; A nut assembly, the nut assembly comprising two precession nuts, the two precession nuts are respectively threadedly connected with the two thread segments, and each of the precession nuts is provided with a first clamping block; A connecting component, wherein the connecting component comprises two second clamps, wherein the two first clamps correspond to the two second clamps one by one and are detachably connected; and further comprises a high temperature resistant pre-tensioning belt, wherein the superconducting base tape, the superconducting tape and the high temperature resistant pre-tensioning belt are aligned and wound around the column, wherein the high temperature resistant pre-tensioning belt is arranged at the outermost side, and both ends of the high temperature resistant pre-tensioning belt are clamped between the first clamp and the second clamp; and the surface of the column is smooth.

2. The multi-layer YBCO superconducting tape preparation device according to claim 1, characterized in that: The column comprises a main body and two fixing blocks. Both ends of the main body are provided with grooves. The two fixing blocks are respectively arranged in the two grooves. Each of the fixing blocks is detachably connected to the main body.

3. The multi-layer YBCO superconducting tape preparation device according to claim 2, characterized in that: The fixing block has the same shape as the groove.

4. The multi-layer YBCO superconducting tape preparation device according to claim 1, characterized in that: The surface of the high temperature resistant pre-tightening belt is smooth.

5. The multi-layer YBCO superconducting tape preparation device according to claim 1, characterized in that: The high temperature resistant pre-tightening belt is a Hastelloy substrate or a stainless steel belt.

6. The multi-layer YBCO superconducting tape preparation device according to claim 1, characterized in that: One of the first clamping block and the second clamping block is provided with a slot matching the other, and the other is embedded in the slot.

7. A method for preparing a multilayer YBCO superconducting tape, characterized in that: The following steps are involved: Step 1, aligning a superconducting base tape and a superconducting tape to form a superconducting tape body, and winding the superconducting tape body on a cylinder; Step 2: tighten the superconducting tape body onto the column. During the tightening process, the superconducting base tape and the superconducting tape are pressed against each other to complete pre-tightening.

8. The method for preparing a multilayer YBCO superconducting tape according to claim 7, characterized in that: The following steps are involved: In the step one, a high temperature resistant pre-tensioning belt is provided, and the high temperature resistant pre-tensioning belt is aligned with the superconducting tape body and then wrapped around the column, with the high temperature resistant pre-tensioning belt being wrapped around the outermost side; in the step two, both ends of the high temperature resistant pre-tensioning belt are stretched so that the superconducting tape body is tightened on the column.

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