Inert-Gas Buffering for Particle Size Separation of Superconductor Precursor Powders

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$100,000.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-05ER84344
Award Id:
72407
Agency Tracking Number:
78953S05-I
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
9701 Valley View Dr., College Station, TX, 77845
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DonSmith
Mr.
(979) 255-5531
atc@cox-internet.com
Business Contact:
PeterMcIntyre
Dr.
(979) 255-5531
atc@cox-internet.com
Research Institute:
n/a
Abstract
78953 In the fabrication of powder-in-tube (PIT) Nb3Sn superconductors, needed for high energy physics applications, the particle size distribution limits the final filament size to which the strand can be drawn. In previous work, a virtual impactor (VI) aerosol particle sizing process was developed to process powders with near-zero-defect removal of all particles larger than a desired threshold size. The process currently operates with ambient air as the suspension fluid for the aerosol process. However, an inert gas would be preferred because, in recent developments by PIT manufacturers, explosions have occurred during the jet-milling to micron particle size. This project will upgrade previously developed particle sizing technology so that powders can be processed in an inert gas atmosphere. In addition, a novel technique will be introduced to suppress limitations to mass loading that arise from particles flowing in the boundary layers. In Phase I, the boundary flow bypass and an inert-gas buffer flow system will be built and integrated with the VI processor. Separation performance will be evaluated and the maximum mass throughput will be determined. The system will be used to process PIT precursor powders, which will be processed into superconducting wire, and performance will be evaluated. Commercial Applications and Other Benefits as described by the awardee: VI processing addresses an important issue for powder metallurgy and ceramics: how to remove particles with larger than nominal size from a grinding process. Applications include powders for ceramics and sunscreen. For ceramics, large particles cause stress concentrations, which cause brittle fracture. Sunscreen powders utilize Ti2O3, the most effective UV absorber, but it is also the pigment for white paint, and makes skin appear pasty. By reducing the particle size, the powder become invisible, while retaining its UV protection capability. Finally, with respect to the revolution in nanoscale materials, the VI technology should face no fundamental barriers in extending down to sizes as small as ~200 Angstroms.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government