Virtual-Impact Particle Sizing for Precursor Powders of Nb3Sn and Bi-2212 Superconductors

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$100,000.00
Award Year:
2001
Program:
STTR
Phase:
Phase I
Contract:
DE-FG03-01ER86123
Agency Tracking Number:
DE-FG03-01ER86123
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Accelerator Technology Corporation
207 Dellwood, Bryan, TX, 77801
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
Research Institution:
Texas Engineering Experiment Station

332 WERC Mail Stop 3000-TAMU
College Station, TX, 77843

Nonprofit college or university
Abstract
Particle size distribution is one of the critical parameters in fabricating high-performance, fine-filament superconductors of Nb3Sn and Bi-2212 using the powder-in-tube (PIT) technique. Even a few large particles in the tubes of a multi-filament PIT billet will limit the size of the drawing or rolling to finish dimension. Since performance scales with the number of filaments in a strand, improving the drawing limits should improve the ultimate performance of the superconducting strand. Virtual-impact processing (VIP), a technique originally developed to separate micron-size particles from air for environmental health studies, can be used to sort powders by particle size. By comparison to other techniques, VIP enables the removal of all particles with size greater than a desired threshold. This project will use a small-scale VIP to produce precursor powders of NbSn2, bronze, and sintered Bi-2212. The target particle size will be 2 mm; all particles of size > 4 mm will be removed. The various process parameters (geometry, air velocity, entrained powder density) as they will optimized and a design for scaling up the process to deliver ~kg/min quantities will be prepared.

* information listed above is at the time of submission.

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