Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Producing powder or short fiber
Patent
1994-09-30
1996-06-04
Lieberman, Paul
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Producing powder or short fiber
505737, 505733, 505782, 505492, 252518, 252521, H01B 1200, H01L 3912
Patent
active
055232850
ABSTRACT:
A process for the preparation of amorphous precursor powders for Pb-doped Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x (2223) includes a freeze-drying process incorporating a splat-freezing step. The process generally includes splat freezing a nitrate solution of Bi, Pb, Sr, Ca, and Cu to form flakes of the solution without any phase separation; grinding the frozen flakes to form a powder; freeze-drying the frozen powder; heating the dried powder to form a dry green precursor powders; denitrating the green-powders; heating the denitrated powders to form phase-clean Bi-2223 powders. The grain boundaries of the 2223 grains appear to be clean, leading to good intergrain contact between 2223 grains.
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Dvorscak Mark P.
Fisher Robert
Lieberman Paul
Moser William R.
Pratt Wyatt B.
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