Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2004.07a
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- Pages.551-554
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- 2004
Mechanical properties at Bi-2223 HTS tapes with various sheath materials
기지금속을 달리한 Bi-2223 초전도 선에서의 기계적 특성 변화
- Ha, Dong-Woo (KERI) ;
- Lee, Dong-Hoon (KERI) ;
- Yang, Joo-Sang (KERI) ;
- Kim, Sang-Chul (Nexans Korea) ;
- Hwang, Sun-Yuk (KERI) ;
- Ha, Hong-Soo (KERI) ;
- Oh, Sang-Soo (KERI)
- 하동우 (한국전기연구원) ;
- 이동훈 (한국전기연구원) ;
- 양주생 (한국전기연구원) ;
- 김상철 (넥상스코리아) ;
- 황선역 (한국전기연구원) ;
- 하홍수 (한국전기연구원) ;
- 오상수 (한국전기연구원)
- Published : 2004.07.05
Abstract
Bi-2223 HTS tapes are used widely for application of superconducting power systems. However there are need the properties of high strength and low AC loss. Two kinds of Bi-2223 HTS tapes with different Ag sheath were used to know the effect of sheath alloying for the strength and the resistivity. The workability and reaction degree of superconducting phase at Bi-2223 HTS tapes were investigated. We designed conventional type-Ag/alloy and double sheathed mono filament type-Ag/alloy/alloy in order to increase the strength and resistivity of matrix in Bi-2223 HTS tapes. The effect of axial strain and thermal cycling on the critical current was investigated for the Bi-2223 HTS tapes. Because the workability of double sheath Bi-2223 HTS tape was lower than one sheath Bi-2223 HTS tape, it was need additional softening treatment. Bi-2223 formation reaction was decreased by Ag alloy matrix during sintering process. Two kinds of Bi-2223/Ag tapes with different Ag sheath were used to know the effect of sheath alloying for the tensile strain. Critical current is drastically decreased for Ag/alloy and Ag/alloy/alloy sheathed tapes at tensile strain above 0.24 % and 0.34 %, respectively. This result showed that mechanical strength was increased over than 40 % by introduce double sheath at mono filament stage.