Method for forming aligned superconducting Bi-Sr-Ca-Cu-O
US5272131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1990 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Mar 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/733
Abstract
A process is provided for forming an oriented thick film superconducting coating on a polycrystalline substrate. The coating includes at least two highly oriented compounds of EQU Bi.sub.a Sr.sub.b Ca.sub.c Cu.sub.d O.sub.x (BSCCO) wherein, in one component, a is 2, b is 2, c is 1, d is 2, and x is 8 and, in another component, a is 2, b is 2, c is 0, d is 1, and x is .apprxeq.6. The process comprising applying a powdered mixture prepared from BiO.sub.3, SrCO.sub.3, CaCO.sub.3, and CuO onto a polycrystalline substrate; rapidly heating the resultant coated substrate to a temperature of from about 1000.degree.-1100.degree. C. for a period of from about 30 minutes, thereby melting the powder and forming a thick film coating; rapidly quenching the coated substrate below which phase transition occurs; and annealing the resultant coated substrate by heating in an atmosphere of an oxygen-containing gas to a temperature of from about 850.degree.-870.degree. C. Suitable polycrystalline substrates are MgO and alumina and mullite. The electrical resistance of these films is 0 or above 80K.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.