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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.

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References

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