Progress in Superconductivity
- Volume 4 Issue 2
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- Pages.180-183
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- 2003
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- 1229-4764(pISSN)
Effects of Ag-alloy sheath on thermal/electrical conductivity of Bi-2223 superconductor tapes
피복합금을 사용한 Bi-2223 선재의 열전도도 및 전기전도도 특성평가
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- John Slavko Volf (Institute for Superconducting and Electronic Materials, University of Wollongong) ;
- Hua Kun Liu (Institute for Superconducting and Electronic Materials, University of Wollongong) ;
- Miles Apperley (Australian Superconductors, Engineering and Innovation Education Centre)
- Published : 2003.04.01
Abstract
We evaluated the effect of alloying-element additions to Ag sheath on thermal conductivity of Bi-2223 superconductor tapes. In order to evaluate the effect of sheath alloys and their configuration on the properties of tape, various combinations of Ag and Ag alloys were selected as inner and outer sheath. Thermal conductivity of the tapes was measured by using thermal integral method at 10∼120 K. It is observed that the presence of alloying-elements such as Mg, Sb, and Au in Ag sheath results in decreased thermal conductivity at low temperature. Specifically, the thermal conductivity of AgMg, AgSb, and AgAu at 40 K were 411.4, 142.3, and 109.7 W/(m·K), respectively, which is about 2∼9 times lower than that of Ag (1004.6 W/(m·K)). In addition, the thermal conductivity of alloy-sheathed tape was significantly dependent on their values of constituent sheath materials.