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Processing of Nanostructured Zirconia Ceramics

Published online by Cambridge University Press:  15 February 2011

G. Skandan ,
H. Hahn ,
B. H. Kear ,
M. Roddy  and
W. R. Cannon
G. Skandan
Affiliation:
Dept. of Materials Science and Engineering, Rutgers, The State University of New Jersey, P.O. Box 909, Piscataway, NJ 08855, U. S. A.
H. Hahn
Affiliation:
Technische Hochschule Darmstadt 31 Hilperstr., Darmstadt, Germany
B. H. Kear
Affiliation:
Dept. of Materials Science and Engineering, Rutgers, The State University of New Jersey, P.O. Box 909, Piscataway, NJ 08855, U. S. A.
M. Roddy
Affiliation:
Dept. of Ceramic Engineering, Rutgers, The State University of New Jersey, P.O. Box 909, Piscataway, NJ 08855, U. S. A.
W. R. Cannon
Affiliation:
Dept. of Ceramic Engineering, Rutgers, The State University of New Jersey, P.O. Box 909, Piscataway, NJ 08855, U. S. A.
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Abstract

The inert gas condensation (IGC) technique was employed to synthesize non-agglomerated nanoparticles of ZrO2 and Y2O3 with different average particle sizes ranging from 4 to 14 run. The sintering behaviors (in air and vacuum) of single phase n-ZrO2 (monoclinic crystal structure) and Y2O3-ZrO2 mixture (Y-TZP) were studied in terms of densification rate and final sintering temperature. There was a strong correlation between densification characteristics and properties of the starting powder compacts such as average particle size, particle and pore size distributions. n-ZrO2 was sintered to full density in air at temperatures as low as 1125°C (0.47 Tm) and in vacuum at 975 °C (0.42 Tm). Although the grain sizes in the fully sintered samples were well below 100 nm, the grains had grown by a factor of 10 as compared to the initial particle size. Therefore, a pressureassisted sintering technique was employed to further reduce the densification temperature and final grain size. Threshold effects in this process are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 207
Copyright
Copyright © Materials Research Society 1994

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References

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