Abstract

Current leads of high $T_{c}$ superconductor were fabricated with Bi excess B $i_{2.2}$/S $r_{1.8}$/C $a_{1}$/C $u_{2}$/ $O_{x}$ composition by rapid cooling method. The dimensions of final samples were fixed 3 mm and 8 mm diameter with 50 mm length each To control uniform density the samples were preformed by CIP(Cold Isostatic Press) process and followed by partial or full melting process after raising up to 90$0^{\circ}C$ for 30min. Plate shaped microstructure was clearly observed adjacent to the Ag tube wall and the size of plate was about 100$\mu$m. However the severe destruction of growth orientation was shown in the inner growth part. critical temperature ( $T_{c}$) was about 53~71K after directional growth while Tc was decreased about 77~80 K before directional growth. After directional growth critical current( $I_{c}$) and critical current density( $J_{c}$) in the specimen of 8 mm diameter at 50 K were about 110 A and 280 A/c $m^2$ respectively.pectively.ely.

Keywords

• $Bi_2$$Sr_2$$Ca_1$$Cu_2$;
• High-temperature superconductor;
• Current leads;
• critical current density;
• Rapid cooling method

• 고온 초전도체;
• 전류도입선;
• 임계전류밀도;
• 급속응고법;

File

Download PDF

References

1. IEEE Trans. Appl. Supercon. v.3 no.1 Superconducting current leads of Bi-based oxide Y. Yamada;T. Yangiya;T. Hasebe;K. Jikihara;M. Ishizuka;S. Yasuhara;M. Ishhara
2. IEEE Trans. Magn. v.M-27 J. L .Wu;J. T. Dederer;P. W. Eckels;S. K Sinho;J. R. Hull;R. B. Poeppel;C. A. Youngdahl;J. P. Singh;M. T. Langan;U. Balachadran
3. IEEE Trans. Magn. v.M-27 F. Grivon;A. Leriche;C. Cottevieille;J. C. Kermarrec;A. Petitbon;A. Fervier
4. IEEE Trans. Magn. v.M-27 B. Dorri;K. Herd;E. T. Laskaris;J. E. Tkaczyk;K. W. Lay
5. Advances in Superconductivity Ⅲ H. Mukai;N. Shibuta;T. Masuda;T. Hikata;M. Ueyama;T. Kato;K. Sato
6. IEEE Trans. Appl. Supercon. v.9 no.2 HTc Current Leads in Commercial Magnet Systems Applying Bi 2212 MCP BSCCO Material J. Bock;S. Gauss;A. Hobl;D. Krischel;M. Schillo;P. Schafer