Abstract
The effects of Ag addition on the mechanical and superconducting properties of Bi2Sr2CaCu2Ox (BSCCO) superconductors were studied, and their microstructures were observed mainly by transmission electron microscopy (TEM). The addition of 10 wt% Ag resulted in an increase in average bending strength from 126 to 170MPa, in Weibul modulus from 3.8 to 9.8 and in the hardness normal to the c plane from 38.7 to 51.8kgf/mm2. The critical current density (Jc) of BSCCO bulk was also increased by addition of Ag. Ag existed as fine particles with the size of about 1μm inside BSCCO grains, and as the second phase at grain boundaries. The Ag phase was strengthened by coherent fine particles of Cu. At the interface between Ag and BSCCO, a Bi-O single layer existed. The mechanical properties of Ag/BSCOO composites were discussed from the view point of the microstructures.
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