Method of preparing oxide superconducting wire
AssigneeSumitomo Electric Industries, Ltd.
InventorsHidehito Mukai, Kenichi Sato, Nobuhiro Shibuta
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Abstract
In order to prevent inflation of a metallic coating during heat treatment so that no ununiformity is caused in the critical current density in a method of preparing an oxide superconducting wire which is obtained by heat treating and sintering metal-coated raw material powder for an oxide superconductor, raw material powder (5) for an oxide superconductor is filled up in a metal billet (1), which in turn is degassed and sealed in the degassed state, elongated with application of hydrostatic extrusion, and then heat treated.
Claims5
A method of preparing an oxide superconducting wire having a critical current density of 10.sup.4 A/cm.sup.2 at the liquid nitrogen temperature and a length of at least about 5 km, comprising the steps of:
- filling up a metal billet with raw material powder for an oxide superconductor;
- degassing said metal billet;
- sealing said degassed metal billet;
- applying hydrostatic extrusion on said sealed metal billet;
- deformation processing said extruded metal billet to elongate said extruded metal billet;
- and
- heat treating the elongated, extruded metal billet for sintering said raw material powder to form the oxide superconductor.
Dependencies are inferred from the claim text.