Journal Article10.1016/J.PHYSC.2008.05.270
Research and development of reel-to-reel TFA–MOD process for coated conductors
Toru Izumi,Masaaki Yoshizumi,Masashi Miura,Y. Sutoh,T. Nakanishi,A. Nakai,Y. Ichikawa,Yoshiteru Yamada,Tomotaka Goto,Akimasa Yajima,Y. Aoki,Takayo Hasegawa,Y. Shiohara +12 more
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TL;DR: In this paper, the control of the starting solution composition, especially for the Ba-poor composition from the Y:Ba:Cu = 1:2:3 stoichiometric one, is found to be effective to improve the J c value of the films.
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Abstract: Recent progress on the efforts for the high performances of I c and I c -B and the development of long tapes and extremely low cost tapes using the reel-to-reel system are reviewed. The control of the starting solution composition, especially for the Ba-poor composition from the Y:Ba:Cu = 1:2:3 stoichiometric one, is found to be effective to improve the J c value of the films. Consequently, the extremely high I c value of 735 A was obtained. On the fabrication of long tapes by the reel-to-reel system, it was found that the rigorous humidity control in the coating chamber is important to obtain the uniform characteristics in long tapes. The idea was applied to fabricate long tapes and a 56 m tape with the end-to-end I c value of 250 A was realized. Additionally, a 1 m long tape using a textured NiW substrate was fabricated as an extremely low cost tape. The high end-to-end I c value of 221 A was recognized in this tape. Concerning to the high production rate over 10 m/h which is one of the required conditions for the extremely low cost, new metal organic solution especially with F-free salt for Y was developed, and coating thicker than 0.5 μm at 10 m/h for one coating and calcinations was achieved. Additionally, the possibility for the multi-turning system in the crystallization equipment was confirmed using the small furnace.
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Citations
Second Generation Wire Development at AMSC
Martin W. Rupich,Xiaoping Li,Srivatsan Sathyamurthy,Cornelis Leo Hans Thieme,K. DeMoranville,J. Gannon,Steven Fleshler +6 more
TL;DR: AMSC has established a Second Generation (2G) High-Temperature Superconductor (HTS) wire manufacturing technology based on the Rolling Assisted Biaxially Textured Substrate and Metal Organic Deposition processes as mentioned in this paper.
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Evolution of Metal-Trifluoroacetate Precursors in the Thermal Decomposition toward High-Performance YBa2Cu3O7 Superconducting Films
Anna Llordes,K. Zalamova,Susagna Ricart,Anna Palau,Alberto Pomar,Teresa Puig,An Hardy,M. K. Van Bael,Xavier Obradors +8 more
TL;DR: In this article, a thorough analytical study on the thermal decomposition evolution of the metal-trifluoroacetate precursor toward high-performance YBa2Cu3O7 superconducting films is presented.
86
Development of (RE)BCO cables for HTS power transmission lines
Shinichi Mukoyama,Masashi Yagi,T. Masuda,Naoyuki Amemiya,Atsushi Ishiyama,Naoji Kashima,Shigeo Nagaya,Y. Aoki,Masaaki Yoshizumi,Yoshiteru Yamada,Toru Izumi,Y. Shiohara +11 more
TL;DR: In this paper, a 20-m long HTS power cable model and a cable intermediate joint were developed, and short circuit current tests were conducted on the cable system that consisted of two 10-m cables, a cable joint, and two terminations.
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Development of TFA-MOD Process for Coated Conductors in Japan
Toru Izumi,Masaaki Yoshizumi,Masashi Miura,K. Nakaoka,Y. Sutoh,Y. Ichikawa,Seiki Miyata,Akira Ibi,Hiroyuki Fukushima,T. Itoh,Tadayuki Takahashi,Y. Aoki,Tsutomu Koizumi,A. Kaneko,Takayo Hasegawa,Yutaka Yamada,Y. Shiohara +16 more
TL;DR: In this paper, the TFA-MOD process for the coated conductors in Japan is reviewed and some important advantages of Ba-poor starting solution are found such as for obtaining higher Jc, shorter reaction time and wider process temperature window.
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Pyrolysis study of solution-derived superconducting YBa2Cu3O7 films: disentangling the physico-chemical transformations
Bohores Villarejo,Cornelia Pop,Sussagna Ricart,Bernat Mundet,Anna Palau,Pere Roura-Grabulosa,Jordi Farjas,Teresa Puig,Xavier Obradors +8 more
TL;DR: In this article, the complex relationship existing during the pyrolysis process between the physico-chemical transformations and the microstructure of the YBa2Cu3O7 (YBCO) films was disclosed.
References
Effect of growth conditions on the properties and morphology of chemically derived epitaxial thin films of Ba2YCu3O7−x on (001) LaAlO3
Paul C. McIntyre,Michael J. Cima,John A. Smith,Robert B. Hallock,Michael P. Siegal,Julia M. Phillips +5 more
TL;DR: In this paper, a superconducting film of 70 nm thickness with zero-field critical current densities greater than 5×106 A/cm2 at 77 K and zero resistance at 92 K was prepared by annealing at 780 and 830 °C in 2.5 × 10−4−1 × 10 −3 atm oxygen furnace atmospheres.
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Advanced TFA-MOD process of high critical current YBCO films for coated conductors
Yoshitaka Tokunaga,Tetsuji Honjo,Teruo Izumi,Yuh Shiohara,Yasuhiro Iijima,Takashi Saitoh,Tomotaka Goto,Atsuya Yoshinaka,Akimasa Yajima +8 more
TL;DR: In this paper, a new combination of starting materials was developed to shorten the calcination time of the metalorganic deposition (MOD) process using metal trifuluoroacetete (TFA) salts for all elements.
78
Fabrication and growth mechanism of YBCO coated conductors by TFA-MOD process
T. Honjo,Yusuke Nakamura,Ryo Teranishi,Yoshitaka Tokunaga,Hiroshi Fuji,Junko Shibata,S. Asada,Toru Izumi,Y. Shiohara,Yasuhiro Iijima,Takashi Saitoh,A. Kaneko,Kiyoshi Murata +12 more
TL;DR: In this article, the authors reported the theoretical analysis of YBCO growth during post-annealing in the TFA-MOD process considering both the diffusion in the gas boundary layer and the growth kinetics at the precursor/YBCO interface.
64
Growth mechanism of YBCO films in metal organic deposition method using trifluoroacetates
TL;DR: In this paper, the theoretical analysis of YBCO growth during post annealing in the TFA-MOD process considering both the diffusion in the boundary layer and the growth kinetics at the precursor/YBCO interface is presented.
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Progress in development of advanced TFA-MOD process for coated conductors
Toru Izumi,Masaaki Yoshizumi,Junko Matsuda,K. Nakaoka,Y. Kitoh,Y. Sutoh,T. Nakanishi,A. Nakai,Kenji Suzuki,Yoshiteru Yamada,Akimasa Yajima,T. Saitoh,Y. Shiohara +12 more
TL;DR: In this article, the TFA-MOD process for coated conductors is reviewed and a new process to prevent the crack formation in the thick film, which is the intermediate annealing between the calcination and the crystallization steps, is developed.
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