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Superconducting fibers from organometallic precursors: Part III. Pyrolytic processing of precursor fibers

Published online by Cambridge University Press:  31 January 2011

Zhi-Fan Zhang ,
Richard A. Kennish ,
Blohowiak Kay A. Youngdahl ,
Martin L. Hoppe  and
Richard M. Laine
Zhi-Fan Zhang
Affiliation:
Polymeric Materials Laboratory of the Washington Technology Center and the Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195
Richard A. Kennish
Affiliation:
Polymeric Materials Laboratory of the Washington Technology Center and the Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195
Blohowiak Kay A. Youngdahl
Affiliation:
Polymeric Materials Laboratory of the Washington Technology Center and the Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, and Boeing Corporation, Seattle, Washington
Martin L. Hoppe
Affiliation:
Polymeric Materials Laboratory of the Washington Technology Center and the Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195
Richard M. Laine
Affiliation:
Polymeric Materials Laboratory of the Washington Technology Center and the Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195
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Abstract

Sixty−70 μm diameter preceramic fibers, extruded from THF solutions containing 1:2:3 stoichiometric mixtures of yttrium, barium, and copper carboxylates, were pyrolytically transformed into ceramic fibers using controlled heating schedules and reactive atmospheres. The objectives of the work reported here were to identify appropriate processing conditions such that during pyrolysis the preceramic fibers would (1) eliminate the organic ligands without pore or void formation, (2) reach full density with a controlled grain size, and (3) form orthorhombic phase, 123 fibers with reasonable mechanical properties. The mechanisms of organic ligand decomposition and loss were examined using mass spectral fragmentation and TGA. Microstructural and phase evolution were correlated with heating schedules and atmospheres, using XRD, DTA, SEM, and limited flux exclusion studies. The mechanisms of decomposition of the spinnable mixtures suggest intermolecular rather than intramolecular decomposition pathways. Different pyrolysis atmospheres were also examined to explore methods of controlling the degradation process. Slow pyrolysis in air followed by oxygen anneals appears to give superior fibers in terms of controlled grain size and phase. The pyrolyzed fibers exhibit the appropriate orthorhombic phase according to x-ray powder diffractometry. Preliminary flux exclusion measurements demonstrate that the fibers are superconducting although the measured δTc is not exceptional.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 8 , August 1993 , pp. 1777 - 1790
Copyright
Copyright © Materials Research Society 1993

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References

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