Strain studies on superconducting Nb{sub 3}Sn tape using differential thermal contraction and other methods
- GE Medical Systems, Florence, SC (United States); and others
Nb{sub 3}Sn tape, manufactured by the General Electric Company for cryocooled, magnetic resonance imaging (MRI) magnets, was examined to determine the influence of strain on critical current, I{sub c}, over a wide range of magnetic fields and temperatures. Copper stabilized Nb{sub 3}Sn tapes were strained by differential thermal contraction by waxing or epoxying the samples to 4.7 cm diameter short sample test bobbins made of brass, stainless steel, Inconel, nickel, niobium and molybdenum. These samples were measured for I{sub c} in transverse fields ranging from 0 to 7 Tesla (T) and over a temperature range of 4.2 to 16 Kelvin (K). Additionally, Nb{sub 3}Sn tape, subjected to bend, twist and pressure stresses, was measured for I{sub c} degradation to determine handling limits during manufacture and insulation of the tape, as well as magnet winding. Finally, unstabilized, reacted Nb{sub 3}Sn foil subjected to various tensile loads was tested for I{sub c} degradation. Surface metallography was used to relate cracking of the Nb{sub 3}Sn layer to I{sub c} degradation.
- OSTI ID:
- 482165
- Report Number(s):
- CONF-950722-; ISSN 0065-2482; TRN: 97:010640
- Journal Information:
- Advances in Cryogenic Engineering, Vol. 42B; Conference: CEC/ICMC `95: cryogenic engineering conference and international cryogenic materials conference, Columbus, OH (United States), 17-21 Jul 1995; Other Information: PBD: 1997
- Country of Publication:
- United States
- Language:
- English
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