Friday, 2C-06, 11:50-12:00

Efforts for Lowering Cost of TFA-MOD Coated Conductors in Japan

Teruo Izumi

M. Yoshizumi, M. Miura, K. Nakaoka, Y. Ichikawa, Y. Sutoh, Y. Yamada and Y. Shiohara

Superconductivity Research Laboratory, ISTEC, 1-10-13, Shinonome, Koto-ku, Tokyo 135-0062, Japan
Tel. +81-3-3536-5711, Fax. +81-3-3536-5717, izumi@istec.or.jp

Y. Aoki, T. Koizumi, T. Nakanishi, T. Kaneko, T. Hasegawa

Showa Cable Systems Co., Ltd., 4-1-1, Minami-hashimoto, Sagamihara, Kanagawa 229-1133, Japan
Tel. +81-42-773-7163, Fax. +81-42-773-7291, y.aoki346@cs.swcc.co.jp

Efforts for lowering the cost of coated conductor processing by the Tri- fuluoroacetates Metal Organic Deposition (TFA-MOD) method in Japan are addressed. In this process, there are roughly three major steps, which are the coating, calcinations and crystallization steps. The reel-to-reel (RTR) system has been developed for coating and calcinations processes, and the RTR and Batch systems have been attempted for the crystallization one in Japan. In the coating/calcinations process, the high production rate should be realized which strongly depends on the tape traveling speed and the single coating thickness. For overcoming the problems, development of starting materials and enlargement of the multi-turning system have been carried out. A uniform 500 m precursor tape was realized by the large scale furnace with 5 m/h of the traveling rate.

Concerning the crystallization step by the RTR system, a high production rate has to be realized for further lower cost, although it could be expected in the Batch type. The multi-turning RTR method with a vertical gas flow system is one approach to solve the problem. It has been confirmed that several ten’s m/h of the production rate was expected in this way.

Additionally, realization of higher critical current under the conditions used for the applications is another approach to reduce the cost due to the unit of $/Am. The composition control of the starting solution and the artificial pinning center control are effective to achieve higher superconducting performances. A high critical current value of 760 A/cm-width under the self-fields and the isotropic critical current of 115 A/cm-width under the applied magnetic field of 1T were realized by a Y(Gd)BCO film with dispersion of BZO nono-particles.

This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as "Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications" and "Development of Materials and Power Applications of Coated Conductors (M-PACC)".

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