Preparation of composite particles of bulk Ba2YCu3O7-X by electrostatic adhesion process

Abstract

Electrostatic adhesion processes are used in preparing composite aerosol particles with the electrostatic adhesion force acting between electropositively-charged and elec-tronegatively-charged particles. This process enables one to disperse the core and subcomponent particles more uniformly and to control the amounts of subcomponent particles adhered to the surface of individual core particles by adjusting the charging voltage. Using the composite particles prepared by the electrostatic adhesion process as a starting powder for sintering a composite bulk body of the Ba 2 YCu 3 O 7-x oxide superconductor with BaZrO 3 inclusions is produced. BaZrO 3 particles with diameters less than 100 nm are uniformly dispersed in the Ba 2 YCu 3 O 7-x matrix. The composite bulk body shows improvement in critical current density, which is based on the uniform dispersion of fine BaZrO 3 particles as magnetic flux pinning centers. These advantages are attributed to the uniform dispersion of BaZrO 3 over the whole starting powder.