Mechanical and superconducting properties of 6-filament MgB2 wires reinforced by Cu, Cu―Nb and NbTi

The comparisons of strengthening abilities of Cu, Cu-Nb, and NbTi for 6-filamentary MgB1.92(TiC)0.08/Nb/Cu wires and the electrical properties of the best reinforced wire are investigated. The Cu-Nb reinforcing core is more appropriate for manufacturing MgB2 wires. It is observed that the Cu-Nb rein...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2012-07, Vol.477, p.56-62
Main Authors: YUYAN SUN, QINGYANG WANG, FANG YANG, XIAOMEI XIONG, MING QI, MING LIANG, GUO YAN, SULPICE, Andre, PINGXIANG ZHANG
Format: Article
Language:English
Subjects:
Applied sciences
Borides
Condensed Matter
Copper
Electric wire
ELECTRICAL CONDUCTIVITY
Electrical engineering. Electrical power engineering
Engineering Sciences
Exact sciences and technology
MAGNESIUM COMPOUNDS
Materials
MECHANICAL PROPERTIES
Niobium
Niobium base alloys
Physics
REINFORCEMENT
SUPERCONDUCTIVITY
WIRE
YIELD STRENGTH
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Summary:The comparisons of strengthening abilities of Cu, Cu-Nb, and NbTi for 6-filamentary MgB1.92(TiC)0.08/Nb/Cu wires and the electrical properties of the best reinforced wire are investigated. The Cu-Nb reinforcing core is more appropriate for manufacturing MgB2 wires. It is observed that the Cu-Nb reinforced wire sintered at 750 degree C for 2 h has the highest yield strength of 101.8 MPa. With the sintering temperature increasing, the yield strength of the Cu-Nb and NbTi reinforced wires increased while the value slightly decreased in the case of Cu reinforced one in this study. According to our calculations, those mechanical properties are suitable for the application requirements of superconducting magnets in low field with the critical engineering current Ic of 197 and 205 A (Jce exceeding 1.7 104 and 1.8 104 A/cm2) before and after 70 MPa axial load on the wire at 20 K, 1.5 T respectively. And within the working temperature range from 10 K to 35 K, the Cu-Nb reinforced wires show the lowest resistivity as well. The Cu-Nb reinforced long MgB1.92(TiC)0.08/Nb/Cu wires with unit length over 1 km have already been manufactured using the similar process. The Cu, Cu-Nb, and NbTi reinforced 6-filament MgB1.92(TiC)0.08/Nb/Cu wires are fabricated by in situ PIT (Powder-in-Tube) method respectively.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2012.02.037