Abstract
MgB2 superconducting thin wires sheathed with stainless steel (SS) and pure iron (Fe) have been prepared by in-situ powder-in-tube process. Using Magnesium hydride MgH2 and amorphous B powders with and without SiC nano-sized powder addition, SS/Fe/MgB2 composites have been fabricated through grooved rolling and drawing to form the round wires of 0.53~0.10 mm in diameter. Both SS and Fe sheaths were hardened to be a Vickers hardness of around Hv 650 and Hv 510 through cold-working at room temperature. The transport critical current (Ic) at 4.2 K for the MgB2 wire increases with decreasing the amount of SiC addition in lower magnetic field than 1 T. The Ic at 4.2 K and self-field for the MgB2 wire of 0.10 mm in diameter without SiC addition is 14 A, which corresponds to the critical current density (Jc) of around 1×104 A/mm2. The present MgB2 thin wires are promising as current leads and level sensor for liquid hydrogen.
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