Accession Number:

ADA218330

Title:

Processing, Fabrication, Characterization and Device Demonstration of High Temperature Superconducting Ceramics

Descriptive Note:

Final rept. 30 Sep 1988-29 Sep 1989, annual technical rept. 1 Oct 1988-30 Nov 1989

Corporate Author:

BOEING AEROSPACE CO SEATTLE WA

Personal Author(s):

Report Date:

1990-01-01

Pagination or Media Count:

183.0

Abstract:

Success with organometallics, citrates, and sintered powder compacts has resulted in two approaches for further development of strain tolerant conductors. They are, thin fibers and tapes, and bulk monoliths. A thorough understanding of the phase relationships in high temperature superconductors, including those phase relationships exhibited by the oxygen sublattice has been developed. This has allowed approaches for addressing the weak-link problem. Processes are being developed to reduce the grain size of fibers, tapes and monoliths. This approach offers the potential to deliver strong, fine-grained material and, with the correct alteration of grain boundaries, the elimination of poor electrical conduction across the weak-links. Other facets of this approach include attempts to texture the fine grains, produce adequate porosity to ensure good oxygenation, and the possible incorporation of silver for matrix strengthening. Work was pursued for producing candidate material for devices based on controlling high temperature peritectic reactions, for example seeding of fibers and tapes with yttrium oxide. The goal of this program is to develop material processes for new high temperature superconducting ceramics and to demonstrate these processes in a high current device. Keywords Current density.

Subject Categories:

  • Electrical and Electronic Equipment
  • Ceramics, Refractories and Glass
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE