Developments in technology of fabricating rare-earth-based high-temperature superconducting multi-narrow wires

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630133
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: YAMASAKI Hirofumi 独立行政法人産業技術総合研究所, エネルギー技術研究部門, 研究グループ長 (90358242)
• Co-Investigator(Kenkyū-buntansha): YAMAGUCHI Iwao (独)産業技術総合研究所, 先進製造プロセス研究部門, 主任研究員 (30358238)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 高温超電導 / 細線化 / 立方体集合組織 / ニッケル平角細線 / ディップコーティング塗布熱分解法

Outline of Final Research Achievements

Conventional high-temperature superconducting (HTS) tapes suffer from large alternating current losses due to perpendicular magnetic fields, and the fabrication of HTS narrow wires are strongly desired. We have obtained nickel narrow flat wires (0.5 mm wide and 0.2 mm thick) by cold rolling and drawing processes, and tried to form cube-texture alignment by heat treatments. Although the wires showed the (100) alignment along the rolling direction, (110)-aligned crystal grains and (100)-aligned grains coexisted in the flat surface. On such surfaces, it was not possible to obtain (100)-aligned buffer layers that are suitable for the deposition of HTS films. We succeeded to obtain epitaxial HTS thin films on the four surfaces of a square SrTiO3 single crystal wire by a dip-coating metalorganic deposition method.

Free Research Field

超伝導材料、超伝導工学・パワー応用