▎ 摘　　要

NOVELTY - Composite (10) comprises a sheath; a magnesium-containing powder tube (200) positioned inside the sheath; and boron-containing powder (300) filled in the magnesium-containing powder tube. The sheath contains niobium, iron, nickel, stainless steel, titanium, tantalum, copper and/or silver. The boron-containing powder is boron powder or a mixed powder of magnesium and boron. The boron-containing powder contains silicon carbide, graphene, carbon nanotubes, hydrocarbons, organic acids and/or carbohydrates. USE - The composite is useful for manufacturing magnesium diboride superconducting wires. ADVANTAGE - The composite has high powder packing density and excellent formability, and maintains improved superconducting properties while maintaining magnesium diboride with homogeneous and wholesome texture. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: manufacturing composite; and manufacturing magnesium diboride superconducting wires. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the composite. 10Composite 200Magnesium-containing powder tube 210Magnesium-containing powder tube inner diameter 220Magnesium-containing powder tube outer diameter 300Boron-containing powder