Metal treatment – Process of modifying or maintaining internal physical... – Superconductive metal or alloy
Reexamination Certificate
2005-05-17
2008-12-02
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Superconductive metal or alloy
C419S023000, C029S599000
Reexamination Certificate
active
07459030
ABSTRACT:
Disclosed is a manufacturing method of an Nb3Sn superconductive wire using a powder technique, the method including the steps of: filling, as a raw powder, an intermetallic compound powder obtained from a metallic powder containing at least one metallic powder selected from Ta powder and Nb powder, and Sn powder, or a mixture of the metallic powder and the Sn powder into a sheath made of Nb or an Nb based alloy; performing a diameter-reduction process on the sheath to form a wire; heat treating the wire; and, forming a superconductive layer on the interface between the sheath and the powder, wherein at least one of the metallic powders selected from the Ta powder and the Nb powder is obtained by aggregating fine particles (primary) in shape of coral to form secondary particles.
REFERENCES:
patent: 2006/0216191 (2006-09-01), Miyazaki et al.
Tachikawa, K. “Developments of A15 Filamentary Composite Superconductors”, Plenum Press, 1980, pp. 1-15.
Neijmeijefr, W.L., et al. “Characteristics of a Production Route for Filamentary Nb3Sn Superconductors Based on a Reaction Between Niobium and Nb6Sn5”, Journal of the Less-Common Metals vol. 160, Elsevier Sequoia/ Printed in the Netherlands, 1990, pp. 161-170.
International Search Report of PCT/JP2005/008970 mailed Sep. 6, 2005.
Kato Hiroyuki
Miyazaki Takayoshi
Tachikawa Kyoji
Zaitsu Kyoji
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Kabushiki Kaisha Kobe Seiko Sho
Reed Smith LLP
Sheehan John P.
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