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Effects of silver additions on resistance to thermal shock and delayed failure of YBa2Cu3O7−δ superconductors

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Abstract

The effect of silver (Ag) addition on the resistance to thermal shock and delayed failure of YBa2Cu3O7−δ superconducting wires has been evaluated. Resistance to thermal shock was evaluated by measuring the critical-current density (Jc) as a function of the number of thermal cycles for YBCO and its composites with 15 vol. % Ag additions. Composite YBCO-Ag wires show a slower decrease in Jc than does monolithic YBCO as the number of thermal cycles increases. The nature of delayed failure was studied by measuring strength (σf) as a function of loading rate (\(\dot \sigma \)) and evaluating the value of the subcritical crack growth parameter N[σf = A\(\dot \sigma \)1/(N+1)]. The value of the N parameter was observed to increase slightly from 35 for YBCO to 41 for YBCO-Ag composites. The improved resistance to thermal shock and subcritical crack growth is believed to be due to improvements in mechanical properties (strength and fracture toughness) and thermal conductivity of YBCO as a result of Ag addition.

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Authors and Affiliations

  1. Materials and Components Technology Division, Argonne National Laboratory, 60439, Argonne, Illinois, USA

    J. P. Singh, J. Joo, D. Singh, T. Warzynski & R. B. Poeppel

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  1. J. P. Singh
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  2. J. Joo
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  3. D. Singh
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  4. T. Warzynski
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  5. R. B. Poeppel
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Singh, J.P., Joo, J., Singh, D. et al. Effects of silver additions on resistance to thermal shock and delayed failure of YBa2Cu3O7−δ superconductors. Journal of Materials Research 8, 1226–1231 (1993). https://doi.org/10.1557/JMR.1993.1226

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  • DOI: https://doi.org/10.1557/JMR.1993.1226

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