摘要
使用自主研发的快热快冷处理设备,对粉末装管Nb/Al前驱线进行快热快冷处理,然后再经过800℃10 h转变退火处理,得到具有Nb3Al超导相的超导短样.通过扫描电镜观察分析超导样品微观结构,发现所有样品均有Nb3Al相存在,但在靠近Ta管内层有少量的Nb2Al相,超导芯内有少量的Nb剩余.在制冷机冷却的环境下使用四引线法测试了样品的超导性能.结果表明,自场下在10.9 K温度时,没有铜稳定体的Nb3Al超导线最高临界电流密度是66.5 A/mm2,超导起始转变温度是15~18 K.
A newapparatus was designed and fabricated for rapid heating and quenching of powder-in-tube（ PIT） Nb / Al precursor. Short superconducting Nb3 Al samples were obtained after transformation annealing at 800 ℃ for 10 h. The SEMimages indicated that the Nb3 Al phase was well formed. However,small amount of Nb2 Al exists near the Ta tube,while a fewof Nb exists in the wire. Superconducting properties of the samples were studied by four probe method in cryocooler. The transport critical current density of the Nb3 Al without Cu is 66. 5 A / mm2at10. 9 K in the self field,and the critical temperature is in the range of 15- 18 K.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第2期300-304,共5页
Journal of Northeastern University(Natural Science)
基金
科技部国家磁约束核聚变能研究专项(2011GB112001)
自然科学基础研究计划--青年人才项目(2015JQ5154)
关键词
快热快冷转变法(RHQT)
超导线
Nb3Al
粉末装管
临界电流
临界温度
rapid heating / quenching and transformation（RHQT）
superconductor wire
Nb3Al
powder-in-tube（PIT）
critical current
critical temperature
