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http://dx.doi.org/10.4313/JKEM.2007.20.6.541

Bending Strain Dependence of the Critical Current in Externally-reinforced Bi-2223 Tapes with Different Hermeticity under pressurized Liquid Nitrogen  

Shin, Hyung-Seop (안동대학교 기계공학부)
Dizon, John Ryan C (안동대학교 기계공학부)
Park, Jeong-Soo (안동대학교 기계공학부)
Rolley, Bonifacio (안동대학교 기계공학부)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.20, no.6, 2007 , pp. 541-545 More about this Journal
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.
Keywords
Bi-2223 tapes; Bending strain effect; Critical current; Pressurized $LN_2$; External reinforcement; Hermeticity;
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