Friday, 2B-04, 9:10-9:20

Efforts for Long Length Coated Conductors with High Performance by TFA-MOD Process 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 scaling up 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 coating, calcinations and crystallization steps. The reel-to-reel (RTR) system has been developed for the 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 uniformities in properties for both end-to-end and edge-to-edge directions and optimization of heat-treatment conditions are main challenges for long tapes with high performance.

On the other hands, there are several issues to be solved for each system of RTR and Batch types in the crystallization step. For example, the steady state growth condition for the RTR system should be achieved. When the appropriate steady state conditions were fixed, it should have no limitation for production with regard to the length. In the Batch system, the scaling-up of the furnace size is required to obtain the long tapes. Then, the temperature and gas flow uniformity in the large furnace are typical issues to be fixed. Through the extensive efforts to overcome the problems, a 500m long tape with a high critical current of 310 A/cm-width was achieved by the Batch type crystallization step.

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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