An Internal Tin Tube Nb3Sn Conductor with Sn-B Core for Improved Non-Copper Critical Current Density
- Supercon, Inc., Shrewsbury, MA (United States)
This STI product describes work performed under a Department of Energy Small Business Innovation Research Phase I award. The project was intended to further the development of the Internal Tin Tube (ITT) process for the fabrication of Nb3Sn conductor by utilizing a Sn-B powder core in the ITT filament instead of the conventional high-tin Cu-Sn core. The Sn-B core was to minimize the dissolution of the tubular niobium filament during heat treatment of the conductor and to simultaneously inhibit the growth of large-grained Nb3Sn at the interface of the core with the inner wall of the filament, effects that commonly occur in ITT conductors having high-tin cores. Both niobium wall dissolution and the formation of large-grained Nb3Sn are detrimental to the critical current density performance of ITT conductors. Wire fabrication problems were encountered due to the presence of large, hard Cu-Ti particles in the powder cores. However, it was found that thick (20-30 microns) layers of relatively fine grain Nb3Sn could be produced. A significant finding was the observation of fine precipitates on the Nb3Sn grain boundaries in reacted samples. Such precipitates could contribute to improved Nb3Sn conductor performance due to enhanced grain boundary flux pinning and restriction of grain growth.
- Research Organization:
- Supercon, Inc., Shrewsbury, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- SC0006164;
- OSTI ID:
- 1064071
- Type / Phase:
- SBIRL
- Report Number(s):
- DOE/SC0006164--1
- Country of Publication:
- United States
- Language:
- English
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