著者

宇佐美 貴史 吉田 隆 一野 祐亮 菅野 未知央 町屋 修太郎 衣斐 顕 和泉 輝郎

出版者

公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.51, no.6, pp.259-264, 2016

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<p>The strain effect of REBa₂Cu₃O<i>_y</i> (REBCO: RE = Y, Gd, Sm)-coated conductors (CCs) on critical current (<i>I</i>_c) is one of the most fundamental factors for superconducting coil applications. In this study, we aim to clarify the effect of artificial pinning center shapes on the strain effect in BHO-doped GdBCO CCs_. To achieve this, we fabricated a Pure-GdBCO CC, a BHO nanorod-doped GdBCO CC and a multilayered-GdBCO (ML-GdBCO) CC, and carried out bending tests. As the result, the strain dependence of <i>I</i>_c for each CC showed an upward convex and the<i> </i>peak strain of the BHO-doped GdBCO CC shifts towards the compressive strain independent of the BHO shapes. In addition, the strain sensitivity of <i>I</i>_c in the GdBCO CCs including BHO becomes smaller. To clarify the difference between the strain sensitivity of <i>I</i>_c and the peak strain among the CCs, we evaluated the residual strain and the slopes of the internal lattice strains against the applied tensile strain (<i>&beta;</i>). From this measurement, the residual strains for the Pure-GdBCO CC and the ML-GdBCO CC were almost the same. In addition, there was no change in the <i>&beta;</i> value between the Pure-GdBCO and ML-GdBCO CCs. These results suggest that the changes in peak strain and strain sensitivity were not related to the internal lattice strain.</p>

著者

中村 武恒 竹内 活徳 高村 豊 岡田 奈々 雨宮 尚之 中尾 公一 和泉 輝郎

出版者

低温工学・超伝導学会

雑誌

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity (ISSN:09195998)

巻号頁・発行日

vol.81, 2009-11-18

参考文献数

1

著者

塩原 融 中岡 晃一 和泉 輝郎 加藤 丈晴

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.80, no.7, pp.406-419, 2016 (Released:2016-06-25)

参考文献数

145

被引用文献数

7

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Since the discovery of the YBCO superconductor, many efforts have been made to develop useful superconductive wire and tape for many electrical power applications. Especially, the second generation coated conductors using REBaCuO (RE: rare earth element, Y, Gd, Sm, Nd, Eu etc) compounds have high expectations because of its high critical current density at the liquid nitrogen temperature and under self fields as well as high magnetic fields. Recently, several processes have been successfully developed to introduce effective magnetic flux pinning centers into the REBCO layer in order to enhance the in-field critical current densities. This paper reviews the present status of the research and development about the improvement of critical currents in considerations of nano-scale microstructure.