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

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.