3Sn 和NbTi的異種材料超導(dǎo)接頭。首先通過(guò)燒結(jié)法制備了Nb3Sn的超導(dǎo)接頭，然后通過(guò)電阻焊接將Nb3Sn超導(dǎo)接頭與NbTi超導(dǎo)體焊接成型。分析了Nb3Sn超導(dǎo)接頭制備過(guò)程中Nb3Sn的微觀組織結(jié)構(gòu)和相變。利用無(wú)損檢測(cè)CT對(duì)接頭結(jié)構(gòu)進(jìn)行三維重構(gòu)，分析了Nb3Sn 和NbTi超導(dǎo)接頭內(nèi)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(chǎng)下對(duì)超導(dǎo)接頭的電阻性能進(jìn)行了測(cè)試和研究。結(jié)果表明，與傳統(tǒng)超導(dǎo)焊料制備的超導(dǎo)接頭相比，電阻焊接制備的超導(dǎo)接頭顯示出良好的耐磁場(chǎng)性能，在1.5 T背景磁場(chǎng)下具有較低的電阻值。;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."/>
3Sn超導(dǎo)體;NbTi超導(dǎo)體;超導(dǎo)接頭;Nb3Sn conductor;NbTi conductor;superconducting joints"/>