Abstract
The production of bulk Bi2+xSr3-yCayCu 2O8+D (Bi-2212) superconductors for fault current limiter application was developed via a partial-melting route. Aiming high Ic (critical current), which is the essential superconducting characteristic for application of this material in the construction of Fault Current Limiters (FCL), the produced blocks have predominance of Bi-2212 phase (83 wt%), which characterizes with high values of zero and onset transport critical temperature of 92K and 97.5K, respectively. A relatively low transition width, DT, from the superconducting to the normal state of 5.5K, revealed a good intergrain connectivity. Consequently, current measurements on the blocks of Bi-2212 show promising Ic values of 230A and 850A for direct and alternate current, respectively. It is expected that further increases in the Ic values will depend on the elimination of an observed amorphous phase and further reduction of amount and grain sizes of secondary phases, still present in the blocks obtained by the proposed partial-melting route. This may be achieved by a further optimization of the partial-melting processing parameters.
Highlights
After 15 years from the discovery of High-Temperature Ceramic Superconductors (HTCS)# there is still no application of these outstanding materials in real commercial scale, in spite of the extraordinary interest of the scientific and industrial communities in the improvement and use of these materials
The analysis provided two relevant informations about the phase composition of the bulk partial-melting route (PMR) obtained material, Fig. 4
A technology for production of bulk Bi2+xSr3-yCayCu2O8+∆ superconductors for fault current limiter (FCL) application is under development, based on the partial-melting route (PMR)
Summary
After 15 years from the discovery of High-Temperature Ceramic Superconductors (HTCS)# there is still no application of these outstanding materials in real commercial scale, in spite of the extraordinary interest of the scientific and industrial communities in the improvement and use of these materials. The commercial utilization of the HTCS in power transmission tapes, wires and cables, electrical motors, generators, current leads, bulk magnets in the Maglev train design and fault current limiters, which are the most desired applications of the HTCS at the present, have not yet become a reality. This occurs due to two main reasons: the complexity of the HTCS materials and, the high cost of the present technologies for production of these materials.
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