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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

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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