Method of producing improved microstructure and properties for c

Details Method of producing improved microstructure and properties for c Method of producing improved microstructure and properties for c

1994-09-15

1996-06-11

Fiorilla, Christopher A.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Shaping or consolidating

264 65, 505500, H01L 3912

Patent

active

055255868

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.degree. 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.degree. C. resulted in a fine-grain microstructure, with an average grain size of approximately 4 .mu.m. Such a microstructure results in reduced microcracking, strengths as high as 191 MPa and high critical current density capacity.

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Patent Abstracts of Japan 02-135617, Aug. 10, 1990, vol. 14, No. 371.

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