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

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.
Inventors:
 [1];  [1];  [2]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
869778
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5395821
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
method; producing; pb-stabilized; superconductor; precursors; articles; therefrom; metal; oxide; powder; prepared; aerosol; pyrolysis; process; solution; cations; introduced; furnace; 600; degree; -1000; 60; produces; micron; submicron; size; powders; loss; lead; stabilizer; resulting; narrow; particle; distribution; grain; readily; converted; superconducting; composition; subsequent; heat; treatment; placed; deformed; form; wire; tape; heated; article; fine; permit; substantial; reduction; time; enabling; continuous; processing; multifilamentary; powder-in-tube; subsequent heat; articles therefrom; continuous processing; 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; superconductor powder; superconducting article; micron size; fine powders; metal cation; powder precursors; powder precursor; conducting wire; /505/252/423/