Abstract
Abstract Bi2.1Sr1.96CaCu2.0O8+δ (Bi-2212) precursor powders were synthesized with co-precipitation process, and Bi-2212 single filament tapes were fabricated with powder-in-tube (PIT) technique. Based on SEM observation, the primary grain size of Bi-2212 precursor powders was 3∼5 μm. However, after sintering, Bi-2212 grains clustered together and the particle size distribution became quite wide, from 10μm to over 180 μm. By dividing the particles into four groups with different average particle sizes, the influences of average particle size on the filament density, microstructures and current capacity of final Bi-2212 tapes were investigated. Results show that with the decrease of particle size, the filament density increases over the entire cold-working process and heat treatment process. Therefore, the intergrain connection is enhanced, which leads to the obvious increase of current capacity.
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