Study of HTS bulk current lead with metal alloy impregnation under vacuum

K. Tsuzuki, D. Sugyo, Y. Kimura, M. Izumi, N. Sakai, M. Miki, H. Hayakawa

研究成果: Article査読

2 被引用数 (Scopus)


The high-temperature superconductor (HTS) bulk current lead (BCL) is a crucial device for a large number of currert applications such as the propulsion motor with HTS winding. The coexistence of low thermal conductivity and superconductivity enables us to shrink the dimension of the power system. To use the BCL effectively, we have to optimize the temperature gradient across the BCL along its length. For this purpose, it is essential to obtain a better physical contact between the bulk HTS surface and Cu terminal leads. There are, however, many pores at the surface of the bulk which cause difficulties for joining. In order to solve this problem, we focused on an impregnation technique which has been known to improve strength and thermal characteristics of the bulk HTS itself by using epoxy. We succeeded to fill in the pores of the bulk HTS surface with a metal alloy impregnation Following this method, we made the BCL of Gd-Ba-Cu-O by ourselves. By adopting a suitable cooling with a GM cryocooler the resistance of the BCL was 0.8 across the BCL under a current flow of 300 A, considering one end was at 40 K and the other one was at 70 K. The properties of the present BCL are satisfactory for connecting a coil in large current power systems such as superconducting motors.

ジャーナルIEEE Transactions on Applied Superconductivity
出版ステータスPublished - 2009 6月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学


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