| US 7,459,030 B2 | ||
| Manufacturing method of Nb3Sn superconductive wire using powder technique | ||
| Takayoshi Miyazaki, Kobe (Japan); Hiroyuki Kato, Kobe (Japan); Kyoji Zaitsu, Kobe (Japan); and Kyoji Tachikawa, Hiratsuka (Japan) | ||
| Assigned to Kabushiki Kaisha Kobe Seiko Sho, Hyogo (Japan) | ||
| Appl. No. 11/596,470 PCT Filed May 17, 2005, PCT No. PCT/JP2005/008970 § 371(c)(1), (2), (4) Date Nov. 13, 2006, PCT Pub. No. WO2005/117032, PCT Pub. Date Dec. 08, 2005. |
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| Claims priority of application No. 2004-155254 (JP), filed on May 25, 2004. | ||
| Prior Publication US 2007/0175543 A1, Aug. 02, 2007 | ||
| Int. Cl. H01L 39/24 (2006.01) | ||
| U.S. Cl. 148—98 [419/23; 29/599] | 9 Claims |
| 1. A manufacturing method of an Nb3Sn superconductive wire using a powder technique, the method comprising the steps of:
reducing oxygen in primary particles of at least one of metallic powders selected from Ta powder and Nb powder using Na, Mg,
or Ca;
aggregating the primary particles thereby obtaining secondary particles in a shape of coral;
filling, as a raw powder, an intermetallic compound powder obtained from said secondary particles and Sn powder, or a mixture
of the secondary particles 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 filled powder.
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