Engineered Dual NbTa Barriers for Higher Jc Nb3Sn Superconductors

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$99,701.00
Award Year:
2009
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-09ER85436
Award Id:
94656
Agency Tracking Number:
91072
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
207 Dellwood, Bryan, TX, 77801
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
141254701
Principal Investigator:
Robert Barber
Mr.
(979) 822-5038
rbarber@shearform.com
Business Contact:
Karl Hartwig
Dr.
(979) 693-4102
kthartwig@shearform.com
Research Institute:
n/a
Abstract
The tantalum (Ta) diffusion barrier in advanced Nb3Sn superconductors often develops a failure mode during wire drawing. In this mode, the Nb and Ta layer deforms non-uniformly, leading to a rough interface with adjacent copper. The non-uniform deformation of these layers can lead to premature wire breakage, breaches in the barrier, and contamination of the copper stabilizer by tin (Sn). This project will demonstrate that a dual NbTa layer, made from the severe plastic deformation of Nb and Ta, exhibits improved co-deformation behavior with pure Cu in advanced Nb3Sn superconductors. Phase I will demonstrate the improved microstructural uniformity and superior mechanical property characteristics of Nb and Ta sheets, which are processed and rolled using equal channel angular extrusion (ECAE), compared to commercially available materials. Also, an improved barrier performance, using a dual NbTa barrier concept, will be demonstrated in composite wires. During Phase II, a second-generation dual NbTa barrier design with fine-grained Nb and Ta components will be fabricated and tested in an experimental Nb3Sn superconductor. Commercial Applications and other Benefits as described by the awardee: This technology should find application in the production of Nb and Ta sheets for use in Nb3Sn superconductors.

* information listed above is at the time of submission.

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