Exploitable results
The development of high current density and of a reliable processing technique for high critical temperature (Tc) superconducting tapes is a necessary for the industrial use of these new advanced materials.
The finally achieved critical densities in bismuth silver critical current optimized bismuth calcium copper oxide(BiSCCO) (2223) tapes were Jc = 45000 Acm{-2} for silver sheathed monofilamentary tapes and Jc =25000 A cm{-2} in 0.5 m samples of 37 filament tapes. A successful method was developed to reinforce the soft silver sheath with dispersion hardened silver magnesium sheaths, thus enhancing the tolerable stress values by a factor of five to yield strengths of 250 Mpa, with a comparable content of superconductor material and nearly the same level of transport current. The analytical work gave new results about the subsequent processes during phase formation, information about the current distribution in the tape and the consequences for the preparation and last not least a quantitative evaluation of the achieved grain alignment in the superconductor which correlates with the transport current. The sum of the results has a strong impact on the reliable industrial processing of mechanical stable, high current long length BiSCCO tapes, which presently appear to be applied in first devices and prototypes of energy technique like the power cable, transformer, magnetic energy storage, nuclear magnetic resonance (NMR) imaging and motors. Further specialized follow up actions like low alternating current (AC) loss tape development and tape modifications for current leads benefit from the experience and success of this project.
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