Seminarium Międzynarodowego Laboratorium Silnych Pól Magnetycznych i Niskich Temperatur PAN
ul. Gajowicka 95, sala seminaryjna (nowy budynek, II piętro)
Superconductive Properties of MgB2 Conditioned by Microstructure
dr hab. inż. T Czujko
Military University of Technology, Department of Advanced Materials and Technologies, Warsaw, Poland
Many papers devoted to MgB2 superconducting properties affected by synthesis method and parameters connected with fabrication process, have been published. Unfortunately, there are no reports and strong evidence which structural parameter is directly responsible for increase of superconducting properties of MgB2. The investigation of relations between morphology and nanostructure superconducting powder will allow to optimize superconducting parameters of MgB2 powder by increase of critical current density to the level of Jc = 105 A/cm2 at magnetic field 7 T and superconducting transition temperature 39 K. Moreover, the role of extremely high argon pressure during sinter preparation can be also a key factor affecting superconducting properties of wires with MgB2 core. The various tendency to the diffusion between sheath material and conducting core related to the technology of magnesium diboride synthesis will allow to eliminate economically unacceptable niobium barrier coatings.
The application of advanced nanostructurization methods of MgB2 powder synthetized by ball milling and mechanical alloying as well as an innovative laser engineered net shape technology (LENS) will allow to commercialize the production of industrial elements characterized by optimal superconductive properties.
Material with such parameters can be an alternative for inexpensive commercialization superconducting wires which can be used in many devices, starting from MRI's, FCL's and inductive heaters up to current lines of hundreds of meters and new generation of electric plants using nuclear fusion.
