Title:
METHOD OF PRODUCING SUPERCONDUCTIVE WIRE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2004/013871
Kind Code:
A1
Abstract:
A method of producing a superconductive wire material comprises a step of filling in a metal pipe raw material powder formed from an oxide superconductive body or raw material powder formed from a precursor that turns to an oxide superconductive body by heat treatment, a step of heating the metal pipe filled with the raw material powder to a temperature between 400°C or more and 800°C or less, a step of reducing pressure in the heated metal pipe to 100 Pa or less, a step of sealing the opening at an end portion of the metal pipe with the pressure reduced, and a step of drawing the metal pipe in which the raw material powder is sealed. When filling density of the raw material powder is between 10% or more and 40% or less, a critical current density can be improved by sufficiently removing gas inside the metal pipe.
Inventors:
AYAI NAOKI (JP)
Application Number:
PCT/JP2003/009704
Publication Date:
February 12, 2004
Filing Date:
July 30, 2003
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
AYAI NAOKI (JP)
AYAI NAOKI (JP)
International Classes:
H01L39/24; (IPC1-7): H01B12/04
Foreign References:
| JP2001184956A | 2001-07-06 | |||
| JPH05234437A | 1993-09-10 | |||
| JPH07105762A | 1995-04-21 | |||
| JPH05282936A | 1993-10-29 | |||
| JPH11185551A | 1999-07-09 |
Other References:
See also references of EP 1528575A4
Attorney, Agent or Firm:
Nakano, Minoru c/o Sumitomo Electric Industries Ltd. (1-3, Shimaya 1-chome, Konohana-k, Osaka-shi Osaka, JP)
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