Abstract
Single core MgB2 tapes with stainless steel sheath were prepared by the powder-in-tube (PIT) method with two-stage heat treatment. Mg flakes (40 meshes) were used instead of microscopic Mg powder to avoid oxidization of Mg and to reduce the fabrication cost. SUS316 tubes of 4.57mm inner diameter and 6.35mm outer diameter were filled with mixtures of Mg flakes and amorphous B powder with average size of 0.82μm, sealed and groove-rolled to an outer diameter of 3.8mm. The rods were pre-heated at 700–900°C in argon atmosphere. These rods were cold-rolled again and flat-rolled to the tapes with the thickness of 0.5mm. Finally, the tapes were heat-treated at temperature from 600°C to 900°C in argon atmosphere. Magnetic susceptibility of each tape was measured by zero-field-cooled and field-cooled condition in a magnetic field of 1.0mT. After final heat treatment, the tapes have no two-stage transition showing a strong intergranular connectivity. Critical current densities were estimated from the magnetization curves. The tape with the heat treatment at 800°C obtains Jc value of 5.3×105A/cm2 at 20K.
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