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Vol.4 , No. 1, Publication Date: Jan. 23, 2017, Page: 1-4
| [1] | M. Nawa, Graduate School of Engineering, Chiba University, Chiba, Japan. |
| [2] | H. Nakagome, Graduate School of Engineering, Chiba University, Chiba, Japan. |
The tensile stress tolerance of a Bi-2223 conductor has been improved using a mechanically strong Ni-Cr reinforcement and pre-tension technique. The resulting high-strength Bi-2223 has the potential to realize a super-high field compact NMR magnet and is anticipated as a next-generation high-temperature superconductor. However, it was found that fracture issues such as buckling and peeling of the Ni-Cr reinforcement occurred upon exposure of the conductor to excessively high temperature. Moreover, the critical current value and tensile stress tolerance were greatly degraded at high temperature. That is, if an excessive temperature rise such as thermal runaway occurs in the practical scale coil, there is a possibility of a dangerous phenomenon such as arc discharge occurring from the buckled part and accompanying equipment damage. The aims of this study are to investigate the mechanism of fracture of High-strength Bi-2223 and develop preventative technology.
Keywords
Neculear Magnetic Resonance (NMR), High-Temperature Superconductor, Thermal Runaway, Buckling, High-Strength Bi-2223
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