Effects of silver additions on resistance to thermal shock and delayed failure of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> superconductors

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<jats:p>The effect of silver (Ag) addition on the resistance to thermal shock and delayed failure of YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>7−δ</jats:sub> superconducting wires has been evaluated. Resistance to thermal shock was evaluated by measuring the critical-current density (<jats:italic>J<jats:sub>c</jats:sub></jats:italic>) 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 <jats:italic>J<jats:sub>c</jats:sub></jats:italic> than does monolithic YBCO as the number of thermal cycles increases. The nature of delayed failure was studied by measuring strength (σ<jats:sub><jats:italic>f</jats:italic></jats:sub>) as a function of loading rate (σ) and evaluating the value of the subcritical crack growth parameter <jats:italic>N</jats:italic>[σ<jats:sub><jats:italic>f</jats:italic></jats:sub> = <jats:italic>A</jats:italic>σ<jats:sup>1/(<jats:italic>N</jats:italic>+1)</jats:sup>]. The value of the <jats:italic>N</jats:italic> 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.</jats:p>

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