Method of producing improved microstructure and properties for ceramic superconductors
Abstract
A ceramic superconductor is produced by close control of oxygen partial pressure during sintering of the material. The resulting microstructure of YBa{sub 2}Cu{sub 3}O{sub x} indicates that sintering kinetics are enhanced at reduced p(O{sub 2}). The density of specimens sintered at 910 C increased from 79 to 94% theoretical when p(O{sub 2}) was decreased from 0.1 to 0.0001 MPa. The increase in density with decrease in p(O{sub 2}) derives from enhanced sintering kinetics, due to increased defect concentration and decreased activation energy of the rate-controlling species undergoing diffusion. Sintering at 910 C resulted in a fine-grain microstructure, with an average grain size of approximately 4 {micro}m. Such a microstructure results in reduced microcracking, strengths as high as 191 MPa and high critical current density capacity. 20 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- OSTI Identifier:
- 242588
- Patent Number(s):
- 5525586
- Application Number:
- PAN: 8-306,927; TRN: 96:013088
- Assignee:
- Univ. of Chicago, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 11 Jun 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; YTTRIUM OXIDES; FABRICATION; MICROSTRUCTURE; BARIUM OXIDES; COPPER OXIDES; CONTROLLED ATMOSPHERES; HIGH-TC SUPERCONDUCTORS; PRESSURE DEPENDENCE; TEMPERATURE RANGE 1000-4000 K
Citation Formats
Singh, J P, Guttschow, R A, Dusek, J T, and Poeppel, R B. Method of producing improved microstructure and properties for ceramic superconductors. United States: N. p., 1996.
Web.
Singh, J P, Guttschow, R A, Dusek, J T, & Poeppel, R B. Method of producing improved microstructure and properties for ceramic superconductors. United States.
Singh, J P, Guttschow, R A, Dusek, J T, and Poeppel, R B. Tue .
"Method of producing improved microstructure and properties for ceramic superconductors". United States.
@article{osti_242588,
title = {Method of producing improved microstructure and properties for ceramic superconductors},
author = {Singh, J P and Guttschow, R A and Dusek, J T and Poeppel, R B},
abstractNote = {A ceramic superconductor is produced by close control of oxygen partial pressure during sintering of the material. The resulting microstructure of YBa{sub 2}Cu{sub 3}O{sub x} indicates that sintering kinetics are enhanced at reduced p(O{sub 2}). The density of specimens sintered at 910 C increased from 79 to 94% theoretical when p(O{sub 2}) was decreased from 0.1 to 0.0001 MPa. The increase in density with decrease in p(O{sub 2}) derives from enhanced sintering kinetics, due to increased defect concentration and decreased activation energy of the rate-controlling species undergoing diffusion. Sintering at 910 C resulted in a fine-grain microstructure, with an average grain size of approximately 4 {micro}m. Such a microstructure results in reduced microcracking, strengths as high as 191 MPa and high critical current density capacity. 20 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {6}
}