3Sn超導體;NbTi超導體;超導接頭"/> 3Sn 和NbTi的異種材料超導接頭。首先通過燒結法制備了Nb3Sn的超導接頭，然后通過電阻焊接將Nb3Sn超導接頭與NbTi超導體焊接成型。分析了Nb3Sn超導接頭制備過程中Nb3Sn的微觀組織結構和相變。利用無損檢測CT對接頭結構進行三維重構，分析了Nb3Sn 和NbTi超導接頭內部的缺陷和2種不同材料間的微觀連接狀態(tài)。最后，在背景磁場下對超導接頭的電阻性能進行了測試和研究。結果表明，與傳統(tǒng)超導焊料制備的超導接頭相比，電阻焊接制備的超導接頭顯示出良好的耐磁場性能，在1.5 T背景磁場下具有較低的電阻值。"/>

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電阻焊接技術制備Nb3Sn-NbTi 混合超導接頭
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1.中國科學院電工研究所，北京 100190;2.中國科學院大學，北京 100049;3.齊魯中科電工先進電磁驅動技術研究院，山東 濟南 250102;4.西部超導材料科技股份有限公司，陜西 西安 710018

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Preparation of Nb3Sn-NbTi Hybrid Superconducting Joint by Resistive Welding Technique
Author:
Affiliation:

1.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology, Jinan 250102, China;4.Western Superconducting Technologies Co., Ltd, Xi 'an 710018, China

Fund Project:

National Key R&D Program of China (2022YFB3804004, 2022YFF0706904); National Natural Science Foundation of China (52307032)

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    摘要:

    在強磁場超導磁體應用中，特別是具有高穩(wěn)定度高場超導磁體，具有極低電阻的超導接頭發(fā)揮著重要作用。通過電阻焊接方法制備了Nb3Sn 和NbTi的異種材料超導接頭。首先通過燒結法制備了Nb3Sn的超導接頭，然后通過電阻焊接將Nb3Sn超導接頭與NbTi超導體焊接成型。分析了Nb3Sn超導接頭制備過程中Nb3Sn的微觀組織結構和相變。利用無損檢測CT對接頭結構進行三維重構，分析了Nb3Sn 和NbTi超導接頭內部的缺陷和2種不同材料間的微觀連接狀態(tài)。最后，在背景磁場下對超導接頭的電阻性能進行了測試和研究。結果表明，與傳統(tǒng)超導焊料制備的超導接頭相比，電阻焊接制備的超導接頭顯示出良好的耐磁場性能，在1.5 T背景磁場下具有較低的電阻值。

    Abstract:

    In high magnetic field magnets, especially those with high stability requirements, superconducting joints with ultra-low resistances play an important role in magnet fabrication. The Nb3Sn and NbTi joints were fabricated by the resistive welding technique. The Nb3Sn joint was fabricated by sintering the Nb-Sn precursors after mechanical alloying. Then the Nb3Sn bulk in the Nb3Sn joint was welded to the NbTi conductor. The microstructure and grain sizes of Nb3Sn bulk after long periods of time at high temperature were investigated. After welding, the joint was analyzed using X-ray nano-CT technology to display the connecting status and the defects between the Nb3Sn and NbTi conductor without destroying the joint. The electrical characteristics of the joints were measured under background fields through the field decay method. Results show that compared with the ones prepared by the commonly used solid matrix replacement technique, the prepared joint exhibits better magnetic field resistance and lower resistance at 1.5 T background field.

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孫萬碩,程軍勝,王磊,陳順中,郭強.電阻焊接技術制備Nb3Sn-NbTi 混合超導接頭[J].稀有金屬材料與工程,2023,52(12):4040~4046.[Sun Wanshuo, Cheng Junsheng, Wang Lei, Chen Shunzhong, Guo Qiang. Preparation of Nb3Sn-NbTi Hybrid Superconducting Joint by Resistive Welding Technique[J]. Rare Metal Materials and Engineering,2023,52(12):4040~4046.]
DOI：10.12442/j. issn.1002-185X.20230493

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  • 收稿日期:2023-08-08
  • 最后修改日期:2023-09-25
  • 錄用日期:2023-10-07
  • 在線發(fā)布日期: 2023-12-25
  • 出版日期: 2023-12-22