Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 1: Superconductivity - Fabrication, Technical Optimization and Characterization

TT 1.10: Vortrag

Freitag, 4. März 2005, 12:30–12:45, TU H104

Cube textured Cu-based substrates for HTS coated conductors — •Rainer Nast, Bernhard Obst, Gunter Kotzyba, and Wilfried Goldacker — Forschungszentrum Karlsruhe, Institut für Technische Physik, Postfach 3640, 76021 Karlsruhe

As alternative substrate tapes for coated conductor, cube textured copper based tapes instead of nickel are possible candidates to achieve high critical current densities in YBCO. The advantages of Cu are the non-ferromagnetism, the larger thermal and electrical conductivity and the lower cost of Cu in comparison to Ni. In this work, we report about the texturing of pure copper and different copper alloys, such as Cu-Sn, Cu-Mn and a dispersion hardened Cu-B4C tape. The annealing temperature have been optimized to get a high volume fraction of the cube texture as sharp as possible. The maximum of the cube texture deviation histograms is at 3.8^∘ for Cu and 4.4^∘ for Cu-B4C. In addition a continuous Ni overlayer was plated on Cu to avoid the diffusion of Cu and to improve the oxidation resistance for the following growth of buffer layers and YBCO.