(Bi, Pb).sub.2, Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x superconductor and method of making same utilizing sinter-forging

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871897

Chen, Nan ^[1]; Goretta, Kenneth C ^[1]; Lanagan, Michael T ^[2]

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1. Downers Grove, IL
2. Woodridge, IL

A (BiPb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x (Bi223) superconductor with high J.sub.c, phase purity, density and mechanical strength is formed from Bi2223 powder which is synthesized from a mixture of Bi.sub.2 O.sub.3, PbO, SrCO.sub.3, CaCo.sub.3 and CuO. The mixture is milled, then dried and calcined to synthesize the Bi2223 powder with the desired phase purity. The calcination is performed by heating the dried mixture for 50 hours at 840.degree. C. The partially synthesized powder is then milled for 1-4 hours before calcining further for another 50 hours at 855.degree. C. to complete the synthesis. After calcination, the Bi2223 powder is cold pressed to a predetermined density and sinter forged under controlled temperature and time to form a Bi2223 superconductor with the desired superconducting properties.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5821201
• OSTI ID: 871897
• Country of Publication: United States
• Language: English

Related Subjects

pb
sr
cu
superconductor
method
utilizing
sinter-forging
bipb
bi223
phase
purity
density
mechanical
strength
formed
bi2223
powder
synthesized
mixture
pbo
srco
caco
cuo
milled
dried
calcined
synthesize
desired
calcination
performed
heating
50
hours
840
degree
partially
1-4
calcining
855
complete
synthesis
cold
pressed
predetermined
sinter
forged
controlled
temperature
time
form
superconducting
properties
cold pressed
desired phase
superconducting properties
controlled temperature
mechanical strength
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