Patent attributes
A method of manufacturing a Fe-sheathed MgB2 wire 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 MgB2 wire; 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.
