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

Published online by Cambridge University Press:  31 January 2011

J.P. Singh ,
J. Joo ,
D. Singh ,
T. Warzynski  and
R.B. Poeppel
J.P. Singh
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
J. Joo
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
D. Singh
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
T. Warzynski
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
R.B. Poeppel
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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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 (σ) and evaluating the value of the subcritical crack growth parameter N[σf = Aσ1/(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.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1226 - 1231
Copyright
Copyright © Materials Research Society 1993

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References

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