PROCESS FOR PRODUCING Nb3Al SUPERCONDUCTIVE WIRE ROD AND Nb3Al SUPERCONDUCTIVE WIRE ROD PRODUCED BY THE PROCESS

Title:

PROCESS FOR PRODUCING Nb3Al SUPERCONDUCTIVE WIRE ROD AND Nb3Al SUPERCONDUCTIVE WIRE ROD PRODUCED BY THE PROCESS

Document Type and Number:

WIPO Patent Application WO/2004/059666

Kind Code:

A1

Abstract:

A process for producing an Nb₃Al superconductive wire rod, comprising providing an Nb₃Al superconductive wire rod obtained by subjecting a precursor wire rod of extrafine multi-core structure having multiple Nb/Al composite core wires embedded in Nb, Ta, an Nb based dilute alloy or a Ta based dilute alloy as a matrix to rapid heating rapid cooling treatment comprising rapidly heating to a temperature zone of about 2000°C within 2 sec and rapidly cooling at a rate of 2000°C/sec or higher to a temperature zone of 400°C or below, and subjecting the Nb₃Al superconductive wire rod to: (A) coating with Cu or Ag as a stabilization material; (B) hot isostatic pressing (HIP) treatment conducted for 10 min or more in an inert gas atmosphere under a pressure of 40 atm or higher; and (C) heat treatment conducted at 680 to 850°C for 1 to 200 hr to thereby obtain an Nb₃Al extrafine multi-core superconductive wire rod. This process for producing an Nb₃Al superconductive wire rod realizes relatively low cost, enables producing both round wire and rectangular wire and attains enhanced stabilization of superconducting performance. There is further described the Nb₃Al superconductive wire rod produced by the process.

Inventors:

INOUE KIYOSHI (JP)
KIKUCHI AKIHIRO (JP)
IIJIMA YASUO (JP)
TAKEUCHI TAKAO (JP)

Application Number:

PCT/JP2003/016792

Publication Date:

July 15, 2004

Filing Date:

December 25, 2003

Export Citation:

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Assignee:

NAT INST FOR MATERIALS SCIENCE (JP)
INOUE K (JP)
KIKUCHI AKIHIRO (JP)
IIJIMA YASUO (JP)
TAKEUCHI TAKAO (JP)

International Classes:

C22C27/02; C22F1/18; H01B1/00; C22F1/00; H01B12/10; H01B13/00; H01L39/24; (IPC1-7): H01B13/00; H01B12/10; C22F1/00

Foreign References:

JPS62278253A	1987-12-03
JP2002033025A	2002-01-31
JPH06283059A	1994-10-07
JP2001052547A	2001-02-23
JPH11102617A	1999-04-13
JP2000195349A	2000-07-14
JPH06223647A	1994-08-12
JPH04334822A	1992-11-20
JP2000113748A	2000-04-21

Other References:

INOUE K: "Development of Nb3Al conductors having great potentialities in high energy physics", SUPERCONDUCTING MATERIALS FOR HIGH ENERGY COLLIDERS, 25 October 1999 (1999-10-25), pages 143 - 159
See also references of EP 1577903A4

Attorney, Agent or Firm:

Nishizawa, Toshio (11-1 Minami-Aoyama 6-chom, Minato-ku Tokyo, JP)

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