Ziel
The finally achieved critical current densities in BSCCO (2223) tapes were Jc = 45000 Acm{-2} for Ag sheathed monofilamentary tapes and Jc = 25000 A cm{-2} in 0.5 m samples of 37 filament tapes. We developed a successful method to reinforce the soft Ag sheath with dispersion hardened AgMg 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 BSCCO tapes, which presently appear to be applied in first devices and prototypes of energy technique like the power cable, transformer, magnetic energy storage, NMR imaging and motor. Further specialized follow up actions like low AC loss tape development and tape modifications for current leads benefit from the experience and success of this project.
The development of high current density and of a reliable processing technique for high Tc superconducting tapes is a necessary step for the industrial use of these new advanced materials.
The proposing group of Laboratories has obtained excellent results in complementary fields and in particular current densities comparable to the most advanced results in USA and Japan.
By joining their efforts in this project the proposing Laboratories intend to use their fabrication and characterization facilities and know how in a synergic effort which will lead to a process characterization, transferable to industrial development.
The planned results is to reach homogeneous tapes exceeding 10 metres length with critical current density in the superconductor above 15000 A/cm2) at 77 Kelvin (4,2 Kelvn) and in zero magnetic field.
In addition the reduction of the sensitivity of the criticalcurrent density (77 K) in a magnetic field is one further main goal of the project. The objective is a transport current significantly above 5000 A/cm2 at 77 Kelvin and 1 Tesla.
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76021 Karlsruhe
Deutschland