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CN-121416213-B - Internal tin method Nb integrated with piezoelectric sensing function3Sn superconducting wire and method for producing same

CN121416213BCN 121416213 BCN121416213 BCN 121416213BCN-121416213-B

Abstract

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb 3 Sn superconducting wire integrating a piezoelectric sensing function and a preparation method thereof. The method comprises the steps of preparing a piezoelectric functional layer and a dielectric layer on the surface of SnAl alloy rods, drilling holes, filling CuAg alloy rods to form composite rods, inserting the composite rods into an internal tin Nb 3 Sn/CuNb composite pipe, drawing into sub-components, bundling, filling into a Ta pipe and an oxygen-free copper pipe, and stretching for multiple times to obtain wires. The piezoelectric functional layer can convert micro strain into a measurable electrical signal, in-situ real-time monitoring of mechanical stress and the like in the wire is realized, the CuAg alloy rod can stabilize the tensile strength of the wire and promote Nb 3 Sn phase generation, and the operation reliability and safety of the high-field magnet under extreme working conditions are improved on the premise of not affecting the superconducting performance.

Inventors

  • HAN GUANGYU
  • WU BO
  • YAN GUO
  • LIU XIANGHONG
  • FENG YONG
  • LI JIANFENG
  • ZHANG PINGXIANG
  • GUO QIANG
  • CHEN JIAXU
  • CHEN TONG
  • WANG CHUNGUANG
  • LI PENGJU
  • CHEN JIANYA
  • LI ZHENG
  • SHI YIGONG

Assignees

  • 西安聚能超导线材科技有限公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (10)

  1. 1. The preparation method of the internal tin method Nb 3 Sn superconducting wire integrating the piezoelectric sensing function is characterized by comprising the following steps of: s1, preparing comb-shaped electrode patterns on the surface of SnAl alloy rods and sintering to form conductive electrodes; S2, dispersing PZT nanofibers in epoxy-polyurethane to prepare a precursor solution; S3, coating the precursor solution obtained in the step S2 on the surface of the SnAl alloy rod obtained in the step S1, enabling PZT nanofibers to realize directional arrangement under the action of an electric field to form a spiral orientation structure, and curing to obtain the SnAl alloy rod with the piezoelectric function layer; S4, depositing an Al 2 O 3 film on the surface of the SnAl alloy rod obtained in the S3 to obtain a SnAl alloy rod with a dielectric layer; s5, wrapping and solidifying the surface of the SnAl alloy rod obtained in the S4 by using a biaxially oriented polyimide film to obtain a SnAl alloy rod with a piezoelectric sensing function; s6, drilling the center of the SnAl alloy rod obtained in the S5 to obtain a SnAl alloy pipe, and filling a CuAg alloy rod into the SnAl alloy pipe to obtain a SnAl/CuAg alloy rod; S7, cleaning the SnAl/CuAg alloy rod obtained in the S6, inserting the cleaned SnAl/CuAg alloy rod into an internal tin method Nb 3 Sn/CuNb composite tube, and carrying out multi-pass drawing forming to obtain a sub-component; And S8, cleaning the subcomponents obtained in the S7, sequentially loading the cleaned subcomponents into a Ta tube and an oxygen-free copper tube, obtaining a final blank, and carrying out multi-pass drawing to obtain the Nb 3 Sn superconducting composite wire rod by the internal tin method.
  2. 2. The method according to claim 1, wherein in S1, the process for preparing the comb-shaped electrode pattern comprises micro-inkjet printing or laser direct writing.
  3. 3. The preparation method according to claim 1, wherein in S2, the PZT nanofibers are prepared by electrospinning, and the PZT nanofibers have a diameter of 80 to 150nm and a length of 5 to 20 μm.
  4. 4. The preparation method according to claim 1, wherein in S2, the volume fraction of PZT nanofibers in the precursor solution is 35 to 50%.
  5. 5. The method of claim 1, wherein the precursor solution is applied to the surface of SnAl alloy rods in step S3 by a process including micro-extrusion or spin coating.
  6. 6. The method according to claim 1, wherein in S3, a direct current electric field is used, the electric field strength is 5-15 kv/cm, the pitch of the spiral alignment structure is 5-20 mm, and the thickness of the piezoelectric functional layer is 20-80 μm.
  7. 7. The method according to claim 1, wherein the method for depositing Al 2 O 3 film on the surface of SnAl alloy rod in S4 comprises atomic layer deposition, and dielectric strength of dielectric layer is not less than 500V/μm.
  8. 8. The preparation method of the biaxially oriented polyimide film according to claim 1, wherein in the step S5, the lamination rate of the biaxially oriented polyimide film is 50-70%, the number of wrapping layers is 2-5, the curing process after wrapping is 180-200 ℃ and 30-120 min, and the curing process is performed in vacuum.
  9. 9. The method of claim 1, further comprising cleaning the surface of SnAl alloy rods prior to S1.
  10. 10. The internal tin method Nb 3 Sn superconducting wire integrating the piezoelectric sensing function is characterized by being prepared by the method according to any one of claims 1-9, and comprising a subgroup component, a Ta pipe and an oxygen-free copper pipe, wherein the subgroup component comprises a CuAg alloy rod, a SnAl alloy pipe, a piezoelectric functional layer, a dielectric layer and an internal tin method Nb 3 Sn/CuNb composite pipe in sequence along the radial direction.

Description

Internal tin method Nb 3 Sn superconducting wire integrating piezoelectric sensing function and preparation method thereof Technical Field The invention belongs to the technical field of superconducting materials, and relates to an internal tin method Nb 3 Sn superconducting wire integrating a piezoelectric sensing function and a preparation method thereof. Background Since the Nb 3 Sn superconducting wire has a high critical current density, it is a core material for manufacturing high-field magnets, and is widely used in fields requiring severe magnet performance, such as fusion apparatuses and particle accelerators. At present, internationally optimal performance and most widely applied Nb 3 Sn superconducting wires are prepared by an internal tin method, and the typical process of the technology is that SnTi alloy rods are inserted into an internal tin method Nb 3 Sn/CuNb composite rod to be assembled to form internal tin method Nb 3 Sn sub-components, then the sub-components are bundled and put into a Ta tube and an oxygen-free copper tube, and the Nb 3 Sn superconducting composite wire is obtained after multi-pass drawing processing. However, the Nb 3 Sn superconducting wire prepared by the existing internal tin method has two key technical defects that firstly, the wire does not have a piezoelectric sensing function, mechanical stress, vibration and impact generated inside the wire in the using process cannot be monitored in situ and in real time, microcrack generation and quench phenomena caused by Lorentz force, thermal stress or electromagnetic force are difficult to judge, and the running stability of a high-field magnet under extreme working conditions is seriously threatened. In view of the core application status of the Nb 3 Sn superconducting wire in the high-end science and technology field, the problems of lack of monitoring function and weak mechanical property are solved, and the method has important significance for improving the operation reliability, safety and service life of the high-field magnet, so that the research and development of the internal tin method Nb 3 Sn superconducting wire with the piezoelectric sensing function and stable mechanical property and the corresponding preparation method become technical requirements to be broken through in the field. Disclosure of Invention The invention aims to solve two technical problems of the traditional internal tin method Nb 3 Sn superconducting wire, namely that firstly, the traditional wire adopts SnTi alloy rods to assemble sub-components, the traditional wire does not have piezoelectric sensing characteristics, mechanical stress, vibration and impact generated inside in the using process cannot be monitored in situ and in real time, microcracks and quench caused by Lorentz force, thermal stress or electromagnetic force are difficult to prevent, and the running safety of a high-field magnet is threatened. The technical scheme adopted by the invention is to provide an internal tin method Nb 3 Sn superconducting wire integrating a piezoelectric sensing function and a preparation method thereof by optimizing the wire core structure design and the preparation process, and the preparation method is as follows: In a first aspect, the invention provides a method for preparing an internal tin method Nb 3 Sn superconducting wire integrating a piezoelectric sensing function, which comprises the following steps: s1, preparing comb-shaped electrode patterns on the surface of SnAl alloy rods and sintering to form conductive electrodes; S2, dispersing PZT (Pb (Zr 0.52Ti0.48)O3) nanofibers in epoxy-polyurethane to prepare a precursor solution; S3, coating the precursor solution obtained in the step S2 on the surface of the SnAl alloy rod obtained in the step S1, enabling PZT nanofibers to realize directional arrangement under the action of an electric field to form a spiral orientation structure, and curing to obtain the SnAl alloy rod with the piezoelectric function layer; S4, depositing an Al 2O3 film on the surface of the SnAl alloy rod obtained in the S3 to obtain a SnAl alloy rod with a dielectric layer; s5, wrapping and solidifying the surface of the SnAl alloy rod obtained in the S4 by using a biaxially oriented polyimide film to obtain a SnAl alloy rod with a piezoelectric sensing function; s6, drilling the center of the SnAl alloy rod obtained in the S5 to obtain a SnAl alloy pipe, and filling a CuAg alloy rod into the SnAl alloy pipe to obtain a SnAl/CuAg alloy rod; S7, cleaning the SnAl/CuAg alloy rod obtained in the S6, inserting the cleaned SnAl/CuAg alloy rod into an internal tin method Nb 3 Sn/CuNb composite tube, and carrying out multi-pass drawing forming to obtain a sub-component; And S8, cleaning the subcomponents obtained in the S7, sequentially loading the cleaned subcomponents into a Ta tube and an oxygen-free copper tube, obtaining a final blank, and carrying out multi-pass drawing to obtain the Nb 3 Sn superconducting w