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Nonaqueous Cold Extrusion as a Route for Yttrium Barium Copper Oxide Wires
Author(s) -
Varma Harikrishna,
Mukundan Poothayil,
Warrier Krishna Gopakumara,
Darmodoran Alathoor D.,
Balachandran Utham
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06726.x
Subject(s) - materials science , yttrium , extrusion , barium , orthorhombic crystal system , copper , microstructure , oxide , composite material , annealing (glass) , metallurgy , yttrium barium copper oxide , copper oxide , sintering , superconductivity , high temperature superconductivity , crystallography , condensed matter physics , crystal structure , chemistry , physics
Yttrium barium copper oxide (YBCO) superconducting wires of diameter 0.2 to 1 mm in the form of spirals up to 50 cm long were made by a novel nonaqueous cold extrusion technique. Finely ground YBCO powder having a set particle size distribution was intimately mixed with a polypropylene compound and extruded manually into wires which were heat‐treated at controlled rates followed by oxygen annealing at 940°C for 10 h. These wires are superconducting with a T c of 89.5 K, the XRD pattern exhibiting an orthorhombic single phase. Current density at zero field was measured to be 223 A/cm 2 . The surface morphology of the extruded wires and microstructure of the polished cross section of the sintered wires are also presented.