Friday, 2B-05, 9:20-9:30

Development of REBCO Coated Conductors on Low Magnetic Textured Metal Substrate

Hajime Ota

Masaya Konishi, Yuki Shingai, Tatsuoki Nagaishi, Takahiro Taneda, Kazuya Ohmatsu

Sumitomo Electric Industries, LTD., 1-1-3, Shimaya, Konohanaku, Osaka, 554-0024 Japan
Tel: +81-6-6466-5639, Fax: +81-6-6466-5705, e-mail: ota-hajime@sei.co.jp, konishi-masaya@sei.co.jp,
shingai-yuuki@sei.co.jp, nagaishi@sei.co.jp, taneda-takahiro@sei.co.jp, ohmatsu-kazuya@sei.co.jp

We have been trying to develop REBa₂Cu₃O_x (RE: rare earth elements) coated conductor tapes. The architecture of the coated conductor was REBa₂Cu₃O_x/CeO₂/YSZ/CeO₂/Ni-alloy substrate. The CeO₂/YSZ/CeO₂ layers and the superconducting layers were grown by RF sputtering and by PLD (pulsed laser deposition), respectively. For AC applications, we had to reduce the magnetization of the substrate. So, we developed a low magnetic clad type substrate. The AC loss of the clad type substrate was confirmed to be comparable to that of a non magnetic substrate. The surface roughness (Ra) and the in-plane alignment of 3rd buffer layer made on the clad type substrate were about 20 nm and about 7 degree, respectively. Buffer layers were made at an average speed of 7 m/h. The I_c and J_c at 77.3K, self field of the HTS layer were 379A/cm-width and 1.9MA/cm², respectively. In addition, we have studied to speed up the process speed of buffer layers. As a result, an average speed of 20m/h was achieved. The thickness, the surface roughness (Ra) and the in-plane alignment of buffer layers at 20m/h were similar to those at 7m/h. The more detail results including HTS properties will be reported. A part of this work was supported by the New Energy and Industrial Technology Development Organization (NEDO).

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