Development of Magnesium Diboride Superconducting Wires through Hot Working with Different Initial Filling Density

Abstract

This study aimed to investigate the use of the hot working in a sealed tube method for the production of Magnesium Diboride (MgB2) wires from a powder state. The wires were synthesized using different initial filling densities of 60%, 80%, and 100%. The Magnesium and Boron powder was ground using agate mortar into a stoichiometric mixture by weight of Mg:B=1:2 and then packed into a stainless steel (SUS316L) tube. Subsequently, the pack was sintered for two hours at 800°C in an air atmosphere and continuously rolled to form a wire. XRD and SEM analyses were then conducted to observe the phase development of the sample produced. The diffraction pattern and microstructure observation results showed that MgB2 phase was successfully created using economically advantageous raw materials of crystalline Mg and amorphous B with 60% filling density. The size of the crystallites and superconducting phase was shown to experience a significant increase. The R-T cryogenic magnet assessed the sample of critical temperature, and MgB2 produced using full amorphous boron had a transition temperature of 39 K.