Advances in Manufacturing ›› 2017, Vol. 5 ›› Issue (2): 165-176.doi: 10.1007/s40436-017-0173-x

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A review of thickness-induced evolutions of microstructure and superconducting performance of REBa2Cu3O7-δ coated conductor

Jian-Xin Lin, Xu-Ming Liu, Chuan-Wei Cui, Chuan-Yi Bai, Yu-Ming Lu, Feng Fan, Yan-Qun Guo, Zhi-Yong Liu, Chuan-Bing Cai   

  1. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
  • 收稿日期:2016-05-01 修回日期:2017-04-17 出版日期:2017-06-25 发布日期:2017-06-25
  • 通讯作者: Chuan-Bing Cai E-mail:cbcai@t.shu.edu.cn
  • 基金资助:

    This work was supported in part by Shanghai Key Laboratory of High Temperature Superconductors (Grant No. 14DZ2260700), the Science and Technology Commission of Shanghai Municipality (Grant Nos. 13111102300 and 14521102800), and the National Natural Science Foundation of China (Grant Nos. 51572165, 11174193 and 51202141)

A review of thickness-induced evolutions of microstructure and superconducting performance of REBa2Cu3O7-δ coated conductor

Jian-Xin Lin, Xu-Ming Liu, Chuan-Wei Cui, Chuan-Yi Bai, Yu-Ming Lu, Feng Fan, Yan-Qun Guo, Zhi-Yong Liu, Chuan-Bing Cai   

  1. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
  • Received:2016-05-01 Revised:2017-04-17 Online:2017-06-25 Published:2017-06-25
  • Contact: Chuan-Bing Cai E-mail:cbcai@t.shu.edu.cn
  • Supported by:

    This work was supported in part by Shanghai Key Laboratory of High Temperature Superconductors (Grant No. 14DZ2260700), the Science and Technology Commission of Shanghai Municipality (Grant Nos. 13111102300 and 14521102800), and the National Natural Science Foundation of China (Grant Nos. 51572165, 11174193 and 51202141)

摘要:

The research and development of high temperature superconducting (HTS) films, especially ReBa2Cu3-O7-δ (REBCO or RE123; RE=Y, Gd, or other rare earths) yttrium-based coated conductors, has generated widespread interest for the potential applications of the second generation superconducting films. In view of commercialization, however, the maximum superconducting currents for coated conductors should be increased further. Unfortunately, it has been frequently observed that the average critical current density Jc decreases with an increase in film thickness. The thickness effect is still a hurdle for largescale production, especially in pulsed laser deposition and metal organic deposition processes. An engineering current of more than 1 000 A/cm is desired owing to the high cost of 2G superconducting materials. The present work attempts to review the evolution of various issues subject to the thickness effect, including the microstructure, epitaxial texture, surface roughness, pinning force, oxygen deficiency, residual stress, copper-rich layers, and segregation of elements. Furthermore, recent progress in enhancing the performance of superconductors especially in terms of critical current density is illustrated, such as the use of heavy doping. Further understanding of the thickness effect is extremely important for large-scale commercial development of the second generation high temperature superconductors.

关键词: Thickness effect, Superconducting film, Critical current density, Microstructure, Epitaxial texture, Pinning force

Abstract:

The research and development of high temperature superconducting (HTS) films, especially ReBa2Cu3-O7-δ (REBCO or RE123; RE=Y, Gd, or other rare earths) yttrium-based coated conductors, has generated widespread interest for the potential applications of the second generation superconducting films. In view of commercialization, however, the maximum superconducting currents for coated conductors should be increased further. Unfortunately, it has been frequently observed that the average critical current density Jc decreases with an increase in film thickness. The thickness effect is still a hurdle for largescale production, especially in pulsed laser deposition and metal organic deposition processes. An engineering current of more than 1 000 A/cm is desired owing to the high cost of 2G superconducting materials. The present work attempts to review the evolution of various issues subject to the thickness effect, including the microstructure, epitaxial texture, surface roughness, pinning force, oxygen deficiency, residual stress, copper-rich layers, and segregation of elements. Furthermore, recent progress in enhancing the performance of superconductors especially in terms of critical current density is illustrated, such as the use of heavy doping. Further understanding of the thickness effect is extremely important for large-scale commercial development of the second generation high temperature superconductors.

Key words: Thickness effect, Superconducting film, Critical current density, Microstructure, Epitaxial texture, Pinning force