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Title: Method of producing Pb-stabilized superconductor precursors and method of producing superconductor articles therefrom

Patent ·
OSTI ID:869778
 [1];  [1];  [2]
  1. Knoxville, TN
  2. Oak Ridge, TN
+ Show Author Affiliations

Metal oxide superconductor powder precursors are prepared in an aerosol pyrolysis process. A solution of the metal cations is introduced into a furnace at 600.degree.-1000.degree. C. for 0.1 to 60 seconds. The process produces micron to submicron size powders without the usual loss of the lead stabilizer. The resulting powders have a narrow particle size distribution, a small grain size, and are readily converted to a superconducting composition upon subsequent heat treatment. The precursors are placed in a metal body deformed to form a wire or tape and heated to form a superconducting article. The fine powders permit a substantial reduction in heat treatment time, thus enabling a continuous processing of the powders into superconducting wire, tape or multifilamentary articles by the powder-in-tube process.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
DOE Contract Number:
AC05-84OR21400
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
Patent Number(s):
US 5395821
OSTI ID:
869778
Country of Publication:
United States
Language:
English

References (6)

Preparation of single-phase 2-2-2-3 Bi(Pb)-Sr-Ca-Cu-O high-temperature superconductor using spray drying journal October 1990
Stabilisation of 110 K superconducting phase in BiSrCaCuO Pb substitution journal January 1989
Single High- T c Phase Region of the Bi-Pb-Sr-Ca-Cu-O System journal July 1989
Direct Preparation of Fine Powders of the 80 K Superconducting Phase in the Bi-Ca-Sr-Cu-O System by Spray Pyrolysis journal July 1989
Preparation of the High- T c Phase of Bi-Sr-Ca-Cu-O Superconductor journal August 1988
Composition Dependence on the Superconducting Properties of Bi-Pb-Sr-Ca-Cu-O journal February 1989

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method
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pb-stabilized
superconductor
precursors
articles
therefrom
metal
oxide
powder
prepared
aerosol
pyrolysis
process
solution
cations
introduced
furnace
600
degree
-1000
60
produces
micron
submicron
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loss
lead
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resulting
narrow
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grain
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subsequent
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deformed
form
wire
tape
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fine
permit
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continuous
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multifilamentary
powder-in-tube
subsequent heat
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submicron size
pyrolysis process
superconductor precursor
metal cations
size distribution
metal oxide
particle size
grain size
heat treatment
superconducting wire
continuous process
process produces
oxide superconductor
substantial reduction
fine powder
readily converted
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superconducting article
micron size
fine powders
metal cation
powder precursors
powder precursor
conducting wire
/505/252/423/