E-MRS Fall Meeting, Symposium C

ZIRCONIA NAOPOWDERS - PREPARATION, CHARACTERISTICS AND SINTERING

K. Haberko, L/. Zych, University of Mining and Metallurgy, Faculty of
Materials Science and Ceramics, Al.Mickiewicza 30, 30-059 Kraków,
Poland, phone (4812)6172507, fax (4812)6334630, e-mail:
[1][email protected]

The dispersed systems called nanopowders composed of elementary
particles (crystallites) whose sizes are smaller than 20 nm can be
used as a starting point for obtaining polycrystals of very small
grain sizes. They are usually manufactured by sintering. Such
materials show several interesting properties, one of which is
superplasticity. Thanks to this phenomenon such polycrystals can be
deformed at moderate temperatures. It improves their mechanical
properties. Although numerous methods of the nanopowders preparation
were elaborated, serious troubles in their processing are still
encountered, mainly due to friction between powder particles. That is
why classical ways of compacting such powders by pressing does not
lead to satisfactory results. This will be exemplified in the present
work using nanopowders in the yttria-zirconia system. A method of
their synthesis under hydrothermal conditions will be described. The
effect of the two forming methods on the powder behavior during
sintering will be shown. The system densification will be followed by
studying the changes of the pore size distribution and microstructure
of the material vs. its shrinkage. The best results were achieved when
pressure filtration technique was applied for compacting the green
material.
References
1. mailto:[email protected]

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1. Advanced nanoporous yttria-stabilized zirconia ceramics for luminescent oxygen sensors
2. Preparation and sintering of nanometric oxides and YAG powders derived from nitrates by precipitation and co-precipitatin method