Bi-Sr-Ca-Cu-O/Ag 複合体の微細構造と機械的性質(<特集>セラミックスの合成と評価)

概要

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The effects of Ag addition on the mechanical and superconducting properties of Bi_2Sr_2CaCu_2O_x(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 170 MPa, in Weibul modulus from 3.8 to 9.8 and in the hardness normal to the c plane from 38.7 to 51.8 kgf/mm^2. The critical current density(J_c)of BSCCO bulk was also increased by addition of Ag. Ag existed as fine particles with the size of about 1 μm 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.
社団法人日本材料学会の論文
1995-06-15