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  • 江朝飞,周鑫鑫,王天格.高温超导Bi2212 圆线材的热失超行为研究[J].低温物理学报,2020,(1):32-37.    [点击复制]
  • JIANG Zhaofei,ZHOU Xinxin,WANG Tiange.The Quench Behavior of High-temperature Superconductor Bi2212 Round Wire[J].LOW TEMPERATURE PHYSICAL LETTERS,2020,(1):32-37.   [点击复制]
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高温超导Bi2212 圆线材的热失超行为研究
江朝飞, 周鑫鑫, 王天格
0
(力学与材料学院, 河海大学, 南京 210098)
摘要:
为了及时的发现和保护超导体在失超过程中由于局部温度的突然升高而导致的材料的不可逆破坏行为,对于超导材料的失超行为深入地研究和定量地分析是必要的. 本文结合电场方程和热平衡方程, 建立了能够描述失超行为的热-电耦合方程, 并构建了能够表征多芯 Bi2212 圆线材结构的三维模型, 同时基于有限单元法进行数值计算, 研究其失超 行 为. 通过对比实验与研究结果验证模型的准确性和有效性, 继而研究了正常区传播速度(NZPV) 和最小失超能( MQE) 与运输电流之间的关系, 并给出了热失超过程中电流重分布过程.
关键词:  Bi2212, 热失超, 正常区传播速度, 最小失超能
DOI:10.13380/j .ltpl.2020.01 .004
基金项目:
The Quench Behavior of High-temperature Superconductor Bi2212 Round Wire
JIANG Zhaofei, ZHOU Xinxin, WANG Tiange
(College of Mechanics and Materials , Hohai University , Nanjing , Jiangsu 210098)
Abstract:
In order to protect high-field superconducting magnets during a quench with rapidly rising hot spot temperatures, it is important to have a quantitative understanding of quench behaviors of superconducting wires at high magnetic fields. In this article, we developed a three-dimensional numerical model of quench initiation and propagationin Bi2Sr2CaCu2 Ox/Ag/Ag alloy (Bi2212 ) multifilamentary composite round wires with the current conservation and the heat conduction equation. The model was verified by comparing the numerical and experimental results. The results show that the normal zone propagation velocity linearly increases, and the minimal quench energy decrease with applied current. And then we presented the current redistribution process on quench
Key words:  Bi2212, Quench, NZPV, MQE, current redistribution

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