Effect of Sheath Material on Structure and Properties of BPSCCO-2223 Conductors
In order to improve the mechanical properties of BPSCCO conductors two alternative methods of hardened sheaths processing were proposed: the fabrication of starting tube from silver alloy with Y and Ni additions in amount less than 0.2 wt. % (Ag-Ni-Y) or from the powder mixture of the same components. Investigation of the mechanical properties of tapes 0.15x4.2 mm2 in section reveals increase of tensile strength after annealing at 840 °C for 200 h by a factor of 3 in comparison with relevant values for Bi-2223/alloy sheathed tapes in the interval between 77 K and 293 K.
KeywordsCritical Current Density Pure Silver Silver Alloy Ceramic Core Composite Tape
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- 1.Tenbrink, J. and Wilhelm, M., Development of technical high-T, superconductor wires and tapes, ASC Chicago, USA (1992)Google Scholar
- 2.Kessler, J. and Goldacker, W., J, vs axial tensile strain investigations in Bi(2223)/AgMg tapes, EUCAS Gottingen, Germany (1993)Google Scholar
- 3.Kessler, J. and Blum, S., High critical currents in Bi(2223) tapes with Ag and hardened Ag sheaths, JALCOM (1993) 195 511–514Google Scholar
- 4.Parrell, J.A. and Dorris, S.E., The effect of sheath material and deformation method on the oxide core density, filament uniformity, and critical current density of (Bi,Pb)2Sr2Ca2Cu,O, tapes, ASC (1994) 40 193–200Google Scholar
- 5.Tanaka, Y. and Ishizuka, M., Introduction of amorphous disc–layers into Bi-2223 lattice of AgCu alloy sheathed tapes and the critical current properties, Fourth Euro Ceramics (1995) 7 255–263Google Scholar
- 6.Grivel, J-C. and Grasso, G., Formation and superconducting properties of the (Bi,Pb)2Sr2Ca2Cu3O10_,, phase in bulk samples with oxide additions and alloyed Ag-sheathed tapes, EUCAS Edinburgh, Scotland (1995)Google Scholar
- 7.A.D.Nikulin, A.K.Shikov, E.V.Antipova, N.E.Khlebova, I.A.Erokhina and I.I.Akimov, Ultrathin ceramic insulation for Ag-sheathed high Tc-superconductors, IEEE ‘Transactions on Applied Superconductivity, 5 (1995) 1842–1844.Google Scholar