ENHANCEMENT OF TRANSPORT CURRENT DENSITY IN YBA2CU3O7-X SUPERCONDUCTORS USING DUAL-TEMPERATURE EXTRUSION PROCESSING

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$50,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
7734
Agency Tracking Number:
7734
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
830 Boston Turnpike, Shrewsbury, MA, 01545
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DR DONALD W CAPONE
() -
Business Contact:
Elaine Drew
() -
Research Institute:
n/a
Abstract
TREMENDOUS EXCITEMENT AND INTEREST HAS BEEN GENERATED IN RECENT MONTHS OVER THE DISCOVERY OF THE YBA(2)CU(3)O(7-X) (123) LIQUID NITROGEN SUPERCONDUCTORS. HOWEVER, THIS EXCITEMENT HAS BEEN TEMPERED BY THE INABILITY TO ACHIEVE LARGE TRANSPORT CURRENT DENSITIES (J(C)S) IN BULK-PROCESSED POLYCRYSTALLINE MATERIALS BECAUSE OF WEAK-LINK BEHAVIOR. THESE WEAK-LINKS HAVE TWO POSSIBLE ORIGINS; FIRSTLY, THE PRESENCE OF NON-SUPERCONDUCTING PHASES AT THE GRAIN BOUNDARIES AND, SECONDLY, THE INTRINSIC ANISOTROPY OF THE SUPERCONDUCTIVITY IN THE HIGH CRITICAL TEMPERATURE SUPERCONDUCTORS. IN THIS PROJECT THE 123 POWDERS WILL BE PROCESSED AVOIDING THE PRESENCE OF A NON-SUPERCONDUCTING BACUO(2)-CUO EUTECTIC, WITH A MELTING TEMPERATURE OF ABOUT 900 DEGREES CENTIGRADE, AND DUAL-TEMPERATURE EXTRUSION TECHNIQUES WILL BE USED TO COLD WORK AND DENSIFY THE POWDERS. INITIAL EXPERIMENTS SHOW ENCOURAGING RESULTS, GIVING CERAMIC FIBERS WITH 90% GREEN DENSITY.

* information listed above is at the time of submission.

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