Thermomechanical Processing of Nb for Improved Superconductor Applications

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$99,280.00
Award Year:
2003
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-02ER83520
Award Id:
61810
Agency Tracking Number:
72559B03-I
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
2805 Brothers Blvd., College Station, TX, 77845
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
RobertBarber
(979) 775-7313
rbarber@cox-internet.com
Business Contact:
K.T.Harwig
(979) 693-4102
kthartwig@cox-internet.com
Research Institute:
n/a
Abstract
72559B03-I For Nb-based superconductor applications, prior work has indicated that if the starting Nb configuration (rod, plate, sheet, or tube) has large grain size, a nonuniform grain size, or significant texture gradients, then the resulting multi-filamentary conductors will have a lower critical current due to fabrication limitations (such as filament size) or such difficulties as filament sausaging. Recent experiments on one-square-inch-cross-section bars have shown that equal channel angular extrusion (ECAE) can be effective not only in reducing the grain sizes but also in homogenizing the micro structure of re-melted Nb. This project will demonstrate that the same technology is effective in processing large diameter (up to 8-inch diameter) commercially fabricated billets. Phase I will demonstrate the scale-up of ECAE processing technology on four-square-inch-cross-section re-melted Nb billets with existing equipment. The scale-up will be assessed by comparing micro-hardness, recrystallized grain size, and microstructural uniformity results on 0.56 , 1, and 4 square-inch-cross-section billets. Commercial Applications and Other Benefits as described by awardee: The ECAE technology should lead to the preparation of better starting pure Nb for Nb3Sn superconductors.

* information listed above is at the time of submission.

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