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Conductors with controlled grain boundaries: An approach to the next generation, high temperature superconducting wire

Published online by Cambridge University Press:  31 January 2011

A. Goyal ,
D. P. Norton ,
D. M. Kroeger ,
D. K. Christen ,
M. Paranthaman ,
E. D. Specht ,
J. D. Budai ,
Q. He ,
B. Saffian  and
F. A. List
...Show all authors
A. Goyal
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
D. P. Norton
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
D. M. Kroeger
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
D. K. Christen
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
M. Paranthaman
Affiliation:
Chemistry and Analytical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
E. D. Specht
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
J. D. Budai
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
Q. He
Affiliation:
University of Tennessee, Knoxville, Tennessee 37996–1200
B. Saffian
Affiliation:
University of Tennessee, Knoxville, Tennessee 37996–1200
F. A. List
Affiliation:
Metals & Ceramics Division, Oak Ridge Laboratory, Oak Ridge, Tennessee 37831–6116
D. F. Lee
Affiliation:
Metals & Ceramics Division, Oak Ridge Laboratory, Oak Ridge, Tennessee 37831–6116
E. Hatfield
Affiliation:
Metals & Ceramics Division, Oak Ridge Laboratory, Oak Ridge, Tennessee 37831–6116
P. M. Martin
Affiliation:
Metals & Ceramics Division, Oak Ridge Laboratory, Oak Ridge, Tennessee 37831–6116
C. E. Klabunde
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6116
J. Mathis
Affiliation:
Oak Ridge Institute of Science and Education, Oak Ridge, Tennessee 37831
C. Park
Affiliation:
Oak Ridge Institute of Science and Education, Oak Ridge, Tennessee 37831
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Abstract

Much of the conductor development effort in the last decade has focused on optimizing the processing of (Bi, Pb)2Sr2Ca2Cu3Ox oxide-powder-in-tube conductors and (Bi, Pb)2Sr2CaCu2O8 (Bi-2212) and TlBa2Ca2Cu3Ox thick film conductors. It is demonstrated that in each of these conductors, critical current densities are dictated by the grain boundary misorientation distributions (GBMD's). Percolative networks of low-angle boundaries with fractions consistent with the active cross-sectional area of the conductor exist in each of these conductors. Further enhancements in the properties require increased numbers of small-angle grain boundaries. Given the processing methods used to fabricate these materials, no clear route employing a simple modification of the established processing method is apparent. To address this need, conductors with controlled or predetermined GBMD's are necessary. Development of biaxial texture appears to be the only possible way to increase the number of small-angle boundaries in a practical and controllable manner. We summarize in this paper recent results obtained on epitaxial superconducting films on rolling-assisted-biaxially-textured-substrates (RABiTS). This technique uses well established, industrially scalable, thermomechanical processes to impart a strong biaxial texture to a base metal. This is followed by vapor deposition of epitaxial buffer layers (metal and/or ceramic) to yield structurally and chemically compatible surfaces. Epitaxial YBa2Cu3O7–δ films grown using laser ablation on such substrates have critical current densities exceeding 106 A/cm2 at 77 K in zero field and have a field dependence similar to epitaxial films on single crystal ceramic substrates. Deposited conductors made using this technique offer a potential route for the fabrication of the next generation high temperature superconducting (HTS) wire capable of carrying high currents in high magnetic fields and at elevated temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 11 , November 1997 , pp. 2924 - 2940
Copyright
Copyright © Materials Research Society 1997

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