Abstract
Alloying an Ag substrate was performed in order to improve thermal and mechanical properties of Bi2Sr2CaCu2Ox(Bi-2212)/Ag composite tapes. Ag-Au alloy, Ag-Cu alloy, Ag-(Mg,Ni) alloy and Ag-Mn alloy were investigated. Alloying with Au drastically decreased electrical conductivity (thermal conductivity) of Ag substrate, but did not degrade the superconducting properties. Addition of (Mg,Ni) or Mn was effective to increase mechanical strength, which was 3–11 times higher than that of pure Ag. Critical current density (J c ) of the composite tapes was degraded with increasing the additive content of Ag-(Mg,Ni) and Ag-Mn alloys, but the J c value was still well over 104 A/cm2 of practical level for addition under lat%.
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