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Solid-state processing and phase development of bulk (MgO)w/BPSCCO high-temperature superconducting composite

Published online by Cambridge University Press:  31 January 2011

Y. S. Yuan
Affiliation:
Department of Mechanical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
M. S. Wong
Affiliation:
Department of Mechanical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
S. S. Wang
Affiliation:
Department of Mechanical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
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Abstract

The inherently weak mechanical properties associated with monolithic high-temperature superconductors (HTS) can be improved by introducing properly selected strong ceramic whiskers into the HTS materials. In this research, processing and superconducting properties of monolithic Pb-doped Bi-2223 (BPSCCO) and MgO whisker-reinforced BPSCCO HTS composite materials have been systematically studied. A solid-state processing method is successfully developed to fabricate the (MgO)w/BPSCCO composite. The HTS composite contains a dense and highly pure BPSCCO matrix phase with a preferred grain orientation, which is reinforced by MgO whiskers randomly oriented in the plane perpendicular to the hot-pressing direction. The HTS composite material is shown to exhibit excellent superconducting properties. For example, a transport Jc measured at 77 K in a zero field has been obtained to exceed 5000 A/cm2 in a (MgO)w/BPSCCO composite with 10% MgO whiskers by volume. Relationships among solid-state processing variables, HTS phase development, and superconducting properties of the monolithic BPSCCO and the HTS composite are established in the paper.

Type
Articles
Copyright
Copyright © Materials Research Society 1996

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