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Chemical Interaction Between Ag-Sheathed Bi-2212 Round Wire Conductor and Alumino-Silicate Braid
| Content Provider | Semantic Scholar |
|---|---|
| Author | Larbalestier, David C. Hellstrom, Eric E. |
| Copyright Year | 2010 |
| Abstract | Introduction Wind-and-react Bi-2212 coils for high-field magnet applications require wire insulation that will withstand aggressive heat treatment. The current insulation is an alumino-silicate braid made of alumino-silicate fibers whose overall composition is ~ 73 wt% Al2O3 and ~27 wt% SiO2, which is that of the mineral mullite. However, the fiber does not have the mullite structure, but rather is a mixture of crystalline Al2O3 and amorphous SiO2. Previous studies show that heat treating 2212 wire with this insulation decreases Ic by ~20%. We report on a study to determine what causes this Ic decrease [1]. We found that Cu diffuses out from the 2212 filaments into the alumino-silicate fibers after the heat treatment. This Cu loss changes the overall composition of the outermost filaments in the 2212 wire, resulting in decreased Ic. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://legacywww.magnet.fsu.edu/mediacenter/publications/reports/2009annualreport/2009-NHMFL-Report156.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
