Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Bending Strain Dependence of the Critical Current in Externally-reinforced Bi-2223 Tapes with Different Hermeticity under pressurized Liquid Nitrogen

외부보강된 밀봉 상태가 다른 Bi-2223테이프의 가압 LN2하에서 임계전류의 굽힘변형률 의존성

  • 신형섭 (안동대학교 기계공학부) ;
  • ;
  • 박정수 (안동대학교 기계공학부) ;
  • Published : 2007.06.01
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Abstract

The critical current degradation behaviors of multifilamentary Bi-2223 superconducting tapes under pressurized liquid nitrogen were investigated using a r-shaped sample holder which gives a series of bending strains to tape. Three kinds of externally-reinforced Bi-2223 tapes with different hermeticity were used as samples. The tape with the thicker reinforcement layer had a better bending strain tolerance of $I_c$, but when the bending strain was calculated at the outermost filament, the $I_c$ degradation behavior became identical. For all samples, $I_{c0}$ decreased with the increase of applied pressure, but the $I_c$ degradation behavior with bending strain at each pressure level was similar. Furthermore, after depressurization from 1 MPa to atmospheric pressure, $I_c$ was completely recovered to its initial values. When the samples were warmed up to room temperature after pressurization tests, the ballooning damage occurred at lower bending strain regions. The region where ballooning was observed was identical to the one where the significant $I_c$ degradation occurred.

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References

  1. K. Osamura, M. Sugano, T. Wada, and S. Ochiai, 'Mechanical properties of Ag/Bi2223 composite superconductors', Adv. Cryo. Eng. Materials., Vol. 46, p. 639, 2000
  2. H. S. Shin and K. Katagiri, 'Critical current degradation behaviour in Bi-2223 superconducting tapes under bending and torsion strains', Supercond. Sci. Tech., Vol. 16, p. 1012, 2003 https://doi.org/10.1088/0953-2048/16/9/309
  3. B. ten Haken, H. H. ten Kate, and J. Tenbrink, 'Compressive and tensile axial strain reduced critical currents in Bi -2212 conductors', IEEE. Trans. Appl, Supercond., Vol. 5, p. 1298, 1995 https://doi.org/10.1109/77.402800
  4. P. Skov- Hansen, Z. Han, and J. I. Bech, 'Stresses and strains in multifilament HTS tapes', IEEE Trans. Appl, Supercond., Vol. 9, p. 2617, 1999 https://doi.org/10.1109/77.785023
  5. J. W. Ekin, D. K. Finnermore, Q. Li, J. Tenbrink, and W. Carter, 'Effect of axial strain on the critical current of Agsheathed Bi-based superconductors in magnetic fields up to 25T', Appl. Phys. Lett., Vol. 61, p. 858, 1992 https://doi.org/10.1063/1.107768
  6. T. Kuroda, K. .Itoh, K. Katagiri, W. Goldacker, W. Haessler, B. ten Haken, et aI, 'Bending strain effect on critical current of Bi - 2223 superconductor tapes - - -report of international round-robin-test', Physica C, Vol. 425, p. 111, 2005 https://doi.org/10.1016/j.physc.2005.06.018
  7. K. Yarnazaki, S. I. Kobayashi, T. Kato, K. Ohkura, M. Ueyama, J. Fujikami, N. Ayai, E. Ueno, M. Kikuchi, K. Hayashi, K. I. Sato, and R. Hata, 'Development of Bi-based Superconducting Wires', SEI Technical Review-English edition, ISSU, p. 16, 2004
  8. C. G. King, D. A. Grey, A. Mantone, K. G. Herd, and E. T. Laskaris, 'Mechanical stabilization of BSCCO- 2223 superconducting tapes', IEEE Trans. Appl. Supercond., Vol. 7, p. 2046, 1997 https://doi.org/10.1109/77.620993
  9. H. S. Shin and K. Katagiri, 'Influence of external reinforcement on stress/strain characteristics of critical current in Ag/ BSCCO superconducting tapes', Proc. Int. Workshop Mechano- Electromagnetic Property of Composite Superconductor, Kobe, p. 31, 2001
  10. K. Itoh, T. Kuroda, and H. Wada, 'VAMAS round robin test on bending strain effect measurement of Bi-2223 tapes', Physica C, Vol. 382, p. 7, 2002 https://doi.org/10.1016/S0921-4534(02)01187-5
  11. W. Goldacker, S. I. Schlachter, R. Nast, H. Reiner, S. Zimmer, H. Kiesel, and A. Nyilas, 'A new bending technique for investigation of $I_c$, vs. bending strain behavior of BSCCO(2223) tapes', Proc. Int. Workshop on Superconductivity, Kobe, Japan, p. 21, 2001
  12. H. S. Shin, J. R. C. Dizon, H. Y. Choi, D. W. Ha, and S. S. Oh, 'Deformation and Ie degradation behavior in bent Bi-2223 tapes under pressurized liquid nitrogen', IEEE Trans. Appl. Supercond., Vol. 16. p. 1051, 2006 https://doi.org/10.1109/TASC.2005.864324