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Multiphase Electrodispersion Precipitation of ZirconiaPowders

Published online by Cambridge University Press:  21 February 2011

Michael T. Harris ,
Warren G. Sisson ,
Timothy C. Scott ,
Osman A. Basaran ,
Charles H. Byers ,
W. Ren  and
Thomas T. Meek
Michael T. Harris
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Warren G. Sisson
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Timothy C. Scott
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Osman A. Basaran
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Charles H. Byers
Affiliation:
Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
W. Ren
Affiliation:
Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37996
Thomas T. Meek
Affiliation:
Materials Science and Engineering Department, University of Tennessee, Knoxville, Tennessee 37996
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Abstract

The multiphase electrodispersion precipitation of zirconia powders has beendone in the electric dispersion reactor (EDR). This paper presents the firstresults obtained where the bench-scale EDR unit was operated in thecontinuous mode to synthesize 130 ± 2 g of ZrO2 powder inapproximately 12 h. An aqueous solution of zirconyl nitrate was dispersedand precipitated in a 2-ethyl-l-hexanol continuous phase containing 0.012 M to 0.12 M ammonia. Agravity settler was used to remove soft agglomerates of the ZrO2particles from the organic solvent. Electric bed filtration was employed toremove the fines from the solvent, which was then recycled.

The particle-size distribution was varied by changing the electric fieldstrength. At high field strengths (approximately 20 kV/cm), the particlesizes ranged from approximately 0.1 to 5 μm. The dried powder had aconsistency of talcum powder. Microwave and conventional heating experimentsshowed that the powders were sinterable. The BET surface area of the powdersranged from approximately 20 to 90 m2/g.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 171
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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