Nb3Al superconductor and method of manufacture

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6699821
APP PUB NO 20020179184A1
SERIAL NO

10119353

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A Nb.sub.3 Al superconducting wire and method for fabricating the same wherein Nb and Al powders in combination, or Nb--Al alloy powders are encapsulated in a metal tube, preferably copper or copper-alloy (e.g., CuNi), and the resultant composite is processed by conventional means to fine wire. Multifilamentary composites are produced by rebundling of the powder-filled wires into metal tubes followed by conventional processing to wire of a desired size. It is required for the use of Nb and Al powders in combination that the Nb and Al powder particle size be less than 100 nm. In the use of Nb--Al alloy powders, it is preferred, but not required, that the powder particle size be similarly of a nanometer scale. The use of nanometer-scale powders is beneficial to wire fabrication, allowing the production of long wire piece-lengths. At final wire size, the wires produced by practice of the present invention are heat treated at temperatures below the melting point of copper (1083.degree. C.), with the heat treatment causing conversion of the powder cores or filaments to the A15 superconductor Nb.sub.3 Al. The resulting superconducting wires display critical superconducting properties previously achievable only by methods employing temperatures well in excess of the melting point of copper.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Composite Materials Technology, Inc.SHREWSBURY, MA19

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Motowidlo, Leszek R Bristol, CT 2 17
Rudziak, Mark K Westminster, MA 9 48
Wong, Terence Cambridge, MA 15 75

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Westinghouse Electric Corp. (4)
4411959 Submicron-particle ductile superconductor 45 1981
* 4575927 Submicron-particle ductile superconductor 15 1983
* 4863804 Superconductor wire and methods of constructing same 27 1985
4865644 Superconducting niobium alloys 4 1987
 
National Research Institute for Metals (1)
5362331 Process and apparatus for producing Nb.sub.3 Al super-conducting wire 8 1993
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
* 4363675 Process for producing compound based superconductor wire 4 1981
 
SUMITOMO ELECTRIC INDUSTRIES, LTD. (3)
* 5006289 Method for producing an elongated sintered article 8 1987
5891585 Nb.sub.3 Al multi-filamentary superconducting wire 3 1996
* 5981444 Process for manufacturing a superconducting wire of compound oxide-type ceramics 13 1997
 
NISSHIN STEEL CO., LTD. (1)
5338333 Production of powdery intermetallic compound having very fine particle size 3 1992
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
NATIONAL INSTITUTE FOR MATERIALS SCIENCE (1)
* 7134181 Method for producing Nb.sub.3Al superconductive wire 0 2003
* Cited By Examiner