High Strength Silver Sheath for Bi2212/Ag Conductor

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-10ER85811
Agency Tracking Number: 94785
Amount: $1,000,000.00
Phase: Phase II
Program: SBIR
Awards Year: 2011
Solicitation Year: 2011
Solicitation Topic Code: 62 a
Solicitation Number: DE-FOA-0000508
Small Business Information
830 Boston Turnpike, Shrewsbury, MA, 01545-3386
DUNS: 065173049
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Wiliam Nachtrab
 (508) 842-0174
Business Contact
 Terence Wong
Title: Mr.
Phone: (508) 842-0174
Email: twong@supercon-wire.com
Research Institution
This proposal describes an innovative high strength silver alloy for making Bi2212/Ag round wire conductor. To generate magnetic fields greater than 20 T, a new high field superconductor such as Bi2212 is needed. However, Bi2212 is brittle ceramic that can be easily damaged, and its critical current is very strain sensitive. The Bi2212 compound is contained in a silver matrix that is chemically compatible with the Bi2212 ceramic. Silver provides very little mechanical support for the superconductor during either magnet fabrication or operation. High field magnets are subject to large stresses, which can exceed the yield strength of the silver matrix, causing degradation of the superconductor, and necessitating more expensive approaches for making high field amgnets. This proposal seeks to develop a high strength, high modulus silver alloy for manufacturing Bi2212 round wire multifilament conductor. The silver is strengthened by a fine dispersion of alumina particles that are chemically inert to Bi2212 and produce an alloy having high strength and stiffness even after high temperature processing. The increased strength and stiffness provided by the silver alloy results in greater resistance to mechanical stresses and electromagnetic forces. These attributes simplify magnet design, resulting in reduced costs with the added benefit of higher performance. Potential applications include particle accelerators and high field NMR magnets. Phase I demonstrated the feasibility of all the critical aspects of the technology: production of an silver/alumina composite, fabrication of tubes from the composite and a Bi2212 conductor using a silver/alumina composite tube. The Phase II plan includes research to further refine the basic alloy formulation, develop improved processing technology, advance the production technology for making tubes, and a full scale demonstration for making a Bi2212 production conductor. Commercial Applications and Other Benefits: A high field superconductor such as Bi2212 will find its primary application in accelerator magnets for high energy physics. The other major application for the technology is high field nuclear magnetic resonance systems for imaging complex organic compounds and biological materials.

* 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
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government