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高场磁体用套管法Nb3Al超导线材制备及性能

Fabrication and properties of rod-in tube Nb3Al superconducting wires for high-field magnets application

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【作者】 潘熙锋闫果陈传齐铭崔利军陈永亮赵勇白质明李成山刘向宏冯勇张平祥

【Author】 PAN XiFeng;YAN Guo;CHEN Chuan;QI Ming;CUI LiJun;CHEN YongLiang;ZHAO Yong;BAI ZhiMing;LI ChengShan;LIU XiangHong;FENG Yong;ZHANG PingXiang;National Engineering Laboratory for Superconducting Materials, Western Superconducting Technologies Co. Ltd.;Department of Physics,Northeast Univeristy;Superconducting Materials Center, Northwest Institutes for Nonferrous Metal Research;Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of China), Superconductivity and New Energy R&D Center, Southwest Jiaotong University;

【机构】 西部超导材料科技股份有限公司,超导材料制备国家工程实验室东北大学物理系西北有色金属研究院超导材料研究所西南交通大学超导与新能源研究开发中心,磁浮技术与磁浮列车教育部重点实验室

【摘要】 采用套管法,结合挤压、拉拔和轧制等塑性加工过程制备了Nb3Al超导线材前驱体长线,并利用自主设计制作的急热急冷(~2000℃,RHQ)装置对线材样品进行RHQ热处理和低温成相退火,获得了高性能的Nb3Al超导线材.结果表明,该线材由管状Nb3Al超导体、Nb基体骨架和孔洞组成;即通过RHQ热处理使Al芯与周围的Nb实现固溶体化,并留下孔洞,随后的低温成相退火使Nb-Al固溶体生成了管状Nb3Al超导体,而在距离Al源较远的位置则留下未反应的Nb基体骨架.通过扫描电子显微镜和磁化率测量显示,该线材中Nb3Al超导体具有精细的晶粒尺寸(50~100 nm)和良好的晶粒连接性;不同样品的起始超导转变温度(Tc)均达到了约17 K,表明该线材中Nb3Al超导体的Nb/Al原子比接近理想的3:1.因此,利用套管法有望制备出满足下一代高场磁体应用的高性能Nb3Al超导线材.

【Abstract】 In this work, rod-in-tube(RIT) method was utilized to make the Nb3 Al precursor long wires, combing with hot-extrution, drawing and rolling process, and consequently high-performance Nb3 Al superconducting wires had been made, which stood up a rapid heating, quenching(RHQ) and low-temperature annealing process by using the home-made RHQ equipment up to 2000°C. The results suggest the Nb3 Al superconducting wires compose with tubular Nb3 Al superconductors, Nb-matrix and holes. By RHQ heat-treatment, Al cores dissolved into the Nb-matrix, reacted with the near Nb layer, and left the holes. After low-temperature annealing, the Nb-Al solid-solution was changed into tubular Nb3 Al superconductor, and un-reacted Nb, far from the Al source, was the Nb-matrix. The SEM and magnetization susceptibility measurements present these Nb3 Al superconductors are with fine grains of 50–100 nm, and well grains-connectivity. All of the onset superconducting transition temperature Tc reach about 17 K, which imply they have Nb/Al atom ratio of 3:1. Therefore, using the RIT Nb/Al precursor wires and RHQ heat-treatment is promising to develop the next-generation high-performance Nb3 Al superconducting wires for high-field magnet application.

【基金】 国家自然科学基金(51302224,51377138和11104224);国家磁约束核聚变能研究专项(2011GB112001)资助
  • 【文献出处】 科学通报 ,Chinese Science Bulletin , 编辑部邮箱 ,2014年22期
  • 【分类号】TM26
  • 【被引频次】2
  • 【下载频次】223
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