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Processing of superconducting ceramics using microwave energy

Patent ·
OSTI ID:5653521
; ;

This patent describes a process for producing a superconducting ceramic material. It comprises mixing powders of Y{sub 2}O{sub 3}, CuO and at least one member selected from the group consisting of BaCO{sub 3} and BaO to produce a powder mixture having a molar ratio of Y:Ba:Cu of about 1:2:3; forming the powder mixture into at least one shaped specimen; calcining the specimen at a temperature of about 900{degrees} C for up to two hours; sintering the calcined specimen to a temperature of about 750{degrees} C for about 30 minutes; cooling the sintered specimen to a temperature of about 500{degrees} C over a period of time of about 30 minutes, in the presence of flowing oxygen; annealing the sintered specimen at a temperature of about 500{degrees} C in the presence of flowing oxygen for about 1 hour; and then cooling the annealed specimen to room temperature, the cooling including cooling at a controlled rate to a temperature of about 200{degrees} C in the presence of flowing oxygen, to produce a superconducting ceramic material; wherein at least one of the calcining and annealing steps comprises heating in microwave energy.

Assignee:
Univ. of Florida, Gainesville, FL (United States)
Patent Number(s):
US 5077268; A
Application Number:
PPN: US 7-177744
OSTI ID:
5653521
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COOLING
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
FABRICATION
FLUID FLOW
HEAT TREATMENTS
HEATING
HIGH-TC SUPERCONDUCTORS
MICROWAVE RADIATION
MIXING
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POWDERS
PYROLYSIS
RADIATIONS
SINTERING
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES