Ex-Situ Manufacturing of SiC-Doped MgB_2 Used for Superconducting Wire in Medical Device Applications

摘要

Magnesium diboride (MgB_2) is a superconductor material with a relatively high critical temperature. Due to its relatively high critical temperature, this material is promising and has the potential to replace Nb_3Sn for wire superconducting used in many medical devices. In this work, nanoparticle SiC-doped MgB_2 superconducting material has been fabricated through an ex-situ method. The doping of nanoparticle SiC by 10 and 15 wt% was conducted to analyze its effect on specific resistivity of MgB_2. The experiment was started by weighing a stoichiometric amount of MgB_2 and nanoparticles SiC. Both materials were mixed and grounded for 30 minutes by using an agate mortar. The specimens were then pressed into a 6 mm diameter stainless steel tube, which was then reduced until 3 mm through a wire drawing method. X-ray diffraction analysis was conducted to confirm the phase, whereas the superconductivity of the specimens was analyzed by using resistivity measurement under cryogenic magnetic system. The results indicated that the commercial MgB_2 showed a critical temperature of 37.5 K whereas the SiC doped MgB_2 has critical temperature of 38.3 K.