Method of manufacturing Fe-sheathed MgB2 wires and solenoids

Details Method of manufacturing Fe-sheathed MgB2 wires and solenoids Method of manufacturing Fe-sheathed MgB2 wires and solenoids

2007-05-08

2007-05-08

Arbes, Carl J. (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C174S125100, C505S230000, C505S704000

Reexamination Certificate

active

11050186

ABSTRACT:
A method of manufacturing a Fe-sheathed MgB2wire includes the steps of:I. Selecting a carbon steel tube with 0.1% to 0.3% carbon;a. Crimping a first end of the tube;b. Selecting a Mg powder at least 99.8% pure, and sized for 325 mesh;c. Selecting a B powder, at least 99.99% pure, and sized for 325 mesh;d. Stoichiometrically mixing the Mg and B powders to form a mixture powder;e. Milling the mixture powder by using high-energy ball mill for 0.5 to 6 hours and using stainless steel mixing balls and vial, wherein the mass ratio of ball to powder is 20:1, to form a milled powder;f. Filling and packing the tube in an argon atmosphere with the milled powder to create a packing density of about 1.5 g/cm3;g. Crimping the second end of the tube to create a powder-filled tube;h. Rolling the powder-filled tube to create the Fe-sheathed MgB2wire; andi. Annealing the as-rolled wire at 600 to 900° C. for 0.5 to 3 hours at high purity argon environment to create superconducting wire.

REFERENCES:
patent: 6687975 (2004-02-01), Tomsic
patent: 6957480 (2005-10-01), Giunchi et al.
patent: 2003/0173103 (2003-09-01), Morita et al.
Fabrication and Properties of Monofilamentary MgB/sub2/ Superconducting Tapes,by Graaso, G.; Malagoli, A; Modica, M.; Tumino, A.; Fereghini, C. et al ; Superconductor Science & Technology Conference Title; supercon. Sci. Tech. (UK) vol. 16, No. 2, p. 271-5; Published Feb. 2003.
“Rapid Communication—Densification of MgB cores in iron-clad tapes”, H. Fang, et al., Superconductor Science and Technology, vol. 17, pp. 127-129, 2004.
“Transport critical current on Fe-sheathed MgB2 coils”, H. Fang, et al., Superconductor Science and Technology, vol. 17, pp. 717-720, 2004.
High critical current density in iron-clad MgB2 tapes, H. Fang, et al.,Applied Physics Letters vol. 82, No. 23, pp. 4113-4115, 2004.

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