Method of producing superconducting fibers of bismuth strontium calcium copper oxide (Bi(2212) and Bi(2223))
This patent describes a method of pendant drop melt extraction forming of superconductive fibers of Bismuth (2212) or (2223) compounds. It comprises heating to a temperature above the melting point of Bi(2212) or (2223) compounds, a superconductive ceramic; contacting the drops with an edge of a cool wheel rotating at a speed of from about 230 rpms to about 430 rpms, which results in formation of fibers from the liquid drops on the wheel; heat treating the fibers at a temperature at from about 820{degrees} C to about 870{degrees} C in air from about 16 hours to about 24 hours to allow crystals of Bismuth ceramic to form within the fibers; and slowly cooling the fibers in to a temperature of at least 200{degrees} C.
- Assignee:
- Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
- Patent Number(s):
- A; US 5053384
- Application Number:
- PPN: US 7-492932
- OSTI ID:
- 5730866
- Country of Publication:
- United States
- Language:
- English
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665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
COOLING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
FIBERS
HEAT TREATMENTS
MELTING POINTS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE