Colloidal Processing of Nanocrystalline Cerium Oxide

  1. Prof. Dr. G. Müller
  1. Andreas Tschöpe,
  2. Jürgen Markmann and
  3. Rainer Birringer

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch46

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Tschöpe, A., Markmann, J. and Birringer, R. (2006) Colloidal Processing of Nanocrystalline Cerium Oxide, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch46

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. Universität des Saarlandes, Saarbrücken, Germany

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

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Keywords:

  • ceramics;
  • nanocrystalline cerium oxide;
  • colloidal processing

Summary

Nanocrystalline cerium oxide was synthesized by homogeneous precipitation. A colloidal aqueous sol of the precipitate was prepared by ultrasonification and was stabilized electrostatically. Transparent green bodies with >45% of theoretical density were generated by centrifugal casting. These green bodies could be sintered to >95% of theoretical density at temperatures as low as 900 °C. This temperature is remarkably lower than the corresponding sintering temperatures of 1600 °C for microcrystalline ceria. Studies on the effect of yttrium doping on cerium oxide grain growth showed that a doping concentration of 7 at-% was effectively retarding grain growth such that an average grain size of <50 nm could be preserved during sintering for 10 hours at a temperature of 1000 °C. The stabilizing effect of Y-doping on the grain size and the high sinter activity of green bodies which were generated by centrifugal casting of a colloidal suspension could be combined to produce high density nanocrystalline cerium oxide ceramic through pressure-less sintering.