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高場磁體用RRP Nb3Sn股線的研制
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國際合作項(xiàng)目(2010DFB50280)；“863”計(jì)劃(2007AA03Z205, 2009AA035401)；國家“973”專項(xiàng)(2008CB717903)；中國科技部 ITER專項(xiàng)(2008GB101001)


Fabrication and Investigation of Nb3Sn Strands by RRP for High Field Magnet
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    摘要:

    采用Rod Restack Process (RRP) 研制了單根線長大于1500 m的高場磁體用Nb3Sn股線，股線選用Nb作為擴(kuò)散阻隔層，分布于各亞組元周圍。在熱處理時(shí)Nb阻隔層不但可以阻止Sn向穩(wěn)定體Cu區(qū)的擴(kuò)散，防止穩(wěn)定體的Sn擴(kuò)散污染，確保股線具有較高的剩余電阻率 (RRR)，同時(shí)，靠近Sn源內(nèi)側(cè)的Nb參與固態(tài)擴(kuò)散反應(yīng)生成A15相Nb3Sn，貢獻(xiàn)臨界電流。在股線的制備過程中，采用Nb-47%Ti (質(zhì)量分?jǐn)?shù)) 芯代替部分Nb芯的方式添加元素Ti，達(dá)到了Ti元素添加目的，該方法因?yàn)槭褂昧艘呀?jīng)商業(yè)化的Nb-47%Ti而有效控制了制作成本。對該股線進(jìn)行熱處理以及超導(dǎo)性能測試研究表明：640 ℃, 60 h 熱處理?xiàng)l件下，股線在12 T，4.2 K, 0.1 μV/cm下的Ic為514 A，股線的RRR為148，具有良好的絕熱穩(wěn)定性；在650 ℃, 100 h下股線的Ic為599 A，RRR=3.77。股線擴(kuò)散阻隔層以及添Ti方式的成功選擇，為獲得長線打下了基礎(chǔ)，為股線性能的初步研究及后續(xù)的實(shí)驗(yàn)提供了直接參考

    Abstract:

    The Nb3Sn strands over 1500 m piece length by Rod Restack Process (RRP) for high field magnet were fabricated by Western Superconducting Technologies Co., Ltd. (WST). The distributing Nb barriers were employed around each sub-element in the process, which not only protect the Cu stabilization from the pollution of Sn, but also contribute to the critical current for forming A15 phase Nb3Sn during the reaction. Meanwhile, Nb-47wt%Ti filaments were adopted to replace some of Nb as the resource of Ti adding in the process, lowering the production price the commercial Nb-47wt%Ti. The testing results show that the Ic of the strands with better stability is 514 A at 12 T, 4.2 K, 0.1 μV/cm with the heat treatment of 640 ℃, 60 h and the RRR value is 148. While the Ic is 599 A with the heat treatment of 665 ℃, 60 h and RRR value is 3.77. The success choosing of barrier and Ti doping make it possible to develop higher quality strands, including long piece length and high critical current

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李春廣,孫霞光,鄧勝濤,管軍強(qiáng),肖成舉,萬曉波,朱思華,李建峰,杜社軍,王天成,張豐收,劉向宏,馮 勇.高場磁體用RRP Nb3Sn股線的研制[J].稀有金屬材料與工程,2012,41(8):1413~1416.[Li Chunguang, Sun Xiaguang, Deng Shengtao, Guan Junqiang, Xiao Chengjun, Wan Xiaobo, Zhu Sihua, Li Jianfeng, Du Shejun, Wang Tiancheng, Zhang Fengshou, Liu Xianghong, Feng Yong. Fabrication and Investigation of Nb3Sn Strands by RRP for High Field Magnet[J]. Rare Metal Materials and Engineering,2012,41(8):1413~1416.]
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  • 收稿日期:2011-08-09
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