PREPARATION OF COMPOSITE-PARTICLES OF BULK BA2YCU3O7-X BY ELECTROSTATIC ADHESION PROCESS

Electrostatic adhesion processes are used in preparing composite aeros ol particles with the electrostatic adhesion force acting between elec tropositively-charged and electronegatively-charged particles. This pr ocess enables one to disperse the core and subcomponent particles more uniformly and to control the amounts of subcomponent particles adhere d to the surface of individual core particles by adjusting the chargin g voltage. Using the composite particles prepared by the electrostatic adhesion process as a starting powder for sintering, a composite bulk body of the Ba2YCu3O7-X oxide superconductor with BaZrO3 inclusions i s produced. BaZrO3 particles with diameters less than 100 nm are unifo rmly dispersed in the Ba2YCu3O7-X matrix. The composite bulk body show s improvement in critical current density, which is based on the unifo rm dispersion of fine BaZrO3 particles as magnetic flux pinning center s. These advantages are attributed to the uniform dispersion of BaZrO3 , over the whole starting powder.