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Electrical and Superconducting Properties in Lap Joints for YBCO Tapes

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Abstract

The joint process between tapes of coated conductors is a critical issue for most applications of high temperature superconductors (HTSs). In this work several lap joints using different techniques were prepared for three different types of commercially available YBCO-coated conductor tapes, with and without copper stabilizer or stainless steel reinforcement layers. Lap joints with effective lengths in the range of 3 to 20 cm were prepared using low melting point In–Sn and Sn–Pb alloys as soldering materials. The electrical resistance, the critical current, and the n-index of the joints were calculated from the electric field vs. current (E×I) characteristic curves under DC current tests and by further subjecting the same samples to tensile stresses. The results showed that the reinforced tape is the more robust tape for the joint-making process, whereas the copper-stabilized tape presented the lowest joint resistivity but with a relatively smaller mechanical strength against tensile stress.

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Acknowledgements

This work was financed by the Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES, Fundação para o Desenvolvimento da UNESP—FUNDUNESP, and Companhia Paulista de Força e Luz—CPFL.

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Authors and Affiliations

  1. School of Engineering of Lorena, University of Sao Paulo EEL-USP, Lorena, SP, Brazil

    C. A. Baldan, U. R. Oliveira, A. A. Bernardes, V. P. Oliveira & C. Y. Shigue

  2. Department of Electrical Engineering, State University of Sao Paulo UNESP, Guaratinguetá, SP, Brazil

    C. A. Baldan

  3. Faculty of Electrical and Computing Engineering, State University of Campinas UNICAMP, Campinas, SP, Brazil

    E. Ruppert

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  1. C. A. Baldan
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  2. U. R. Oliveira
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  3. A. A. Bernardes
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  4. V. P. Oliveira
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  5. C. Y. Shigue
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  6. E. Ruppert
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Correspondence to C. A. Baldan.

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Baldan, C.A., Oliveira, U.R., Bernardes, A.A. et al. Electrical and Superconducting Properties in Lap Joints for YBCO Tapes. J Supercond Nov Magn 26, 2089–2092 (2013). https://doi.org/10.1007/s10948-012-1905-6

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  • DOI: https://doi.org/10.1007/s10948-012-1905-6

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