Ag. Mamalis et al., FABRICATION OF THICK LAYERED SUPERCONDUCTIVE CERAMIC (BI-PB-SR-CA-CU-O) METAL COMPOSITE STRIPS BY EXPLOSIVE CLADDING AND ROLLING/, Journal of materials processing technology, 51(1-4), 1995, pp. 255-273
Explosive cladding, subsequent rolling and heat treatment are employed
to fabricate a composite (sandwich) strip consisting of an intermedia
te high temperature superconducting ceramic layer of the Bi-Pb-Sr-Ca-C
u-O compound and two metal silver plates. Macro- and microstructural e
xperimental observations regarding the quality of the product at the v
arious stages of the fabrication were evaluated using optical and scan
ning electron microscopy and X-ray diffraction techniques, whilst the
superconducting properties of the composite strips were obtained using
ac-magnetic susceptibility techniques; preliminary dc-resistivity mea
surements were made also to evaluate further the superconductive prope
rties of the material. Post-fabrication heat-treatment in air resulted
in improved superconductivity of the heat-treated strips as compared
to the residual superconductivity obtained after rolling, leading ther
efore to useful conculsions regarding the applicability of the fabrica
ted composite plates in the electrical and electronic industries.