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US 7,018,954 B2Granted
Processing of magnesium-boride superconductors
AssigneeAmerican Superconductor Corporation
InventorsCornelis L. Thieme, Martin W. Rupich, Alexander Otto, Gilbert N. Riley, Jr.
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Abstract
Processes for the fabrication of MgB2 powder and wires are provided. Powders are produced by mechanically alloying magnesium- and boron-containing precursors under controlled conditions to avoid secondary phase and impurity formation. Powders are also prepared by vapor phase reaction of volatile magnesium- and boron-containing precursors. Wires, tapes, films and coatings are provided.
Claims25
A method of making a magnesium boride superconductor, comprising:
- combining magnesium-containing and boron-containing precursors to form a homogeneous mixture of magnesium- and boron-containing powders, said combining step carried out under an inert or reducing environment introducing the homogeneous mixture of the magnesium- and boron-containing precursor into a metal sheath;
- and
- heating the homogenous mixture to convert the magnesium- and boron-containing powders into a superconducting magnesium boride.
A method of making a precursor to a magnesium boride superconductor, comprising:
- combining magnesium-containing and boron-containing precursors to form a homogeneous magnesium- and boron-containing powder, said combining step carried out under an inert or reducing environment,
- wherein at least one of the magnesium-containing and boron-containing precursors is a vapor in the combining step.
Dependencies are inferred from the claim text.