Fabrication and properties of YBa2Cu3O7-δAg composite superconducting wires by plastic extrusion technique |
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Authors: | CHAN-JOONG KIM KI-BAIK KIM IL-HYUN KUK GYE-WON HONG SOON-DONG PARK SUK-WOO YANG HYUNG-SIK SHIN |
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Affiliation: | (1) Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung Taejon, 305-600, Korea;(2) Department of Chemical Engineering, Chonbuk National University, Chunju Chonbuk, 560-756, Korea |
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Abstract: | YBa2Cu3O7-δ (Y123)-Ag composite superconducting wires were fabricated by the plastic extrusion method which involves plastic paste making,
die extrusion, binder burn-out and the firing process. The as-extruded Y123-Ag wires were so flexible that they can be easily
fabricated into a desirable shape. The current-carrying properties of the wire are dependent on sample size, sintering temperature
and silver content. The critical current density, J
c, of the Y123 wire with a large cross-section was lower than that of the wires with a small cross-section, probably due to
the large self-induced magnetic field. J
c of the Y123-Ag wires increased with increasing sintering temperature but abruptly decreased above 910 °C, which is close
to the eutectic temperature of the Y–Ba–Cu–O system. A silver addition of 10–20 wt% slightly increased J
c of the Y123 (at 77 K and 0 T, it was 140 and 250 A cm -2 for the undoped Y123 wire and the Y123 wire with 20 wt% Ag addition, respectively), but further silver addition had a deleterious
effect on J
c (180 A cm -2 for 30 wt% Ag addition). The small increment in J
c in the Y123 wire with 10–20 wt% Ag addition appears to be due to the enhanced densification and the associated microstructural
variation. The decreased J
c of the Y123 wire with 30 wt% Ag addition is considered to be due to the formation of non-superconducting phase, Y2BaCuO5 (Y211), BaCuO2 and CuO phases via the decomposition of the Y123 phase.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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