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KOCJAN, A. POUCHLÝ, V. SHEN, Z.
Original Title
Processing of zirconia nanoceramics from a coarse powder
Type
journal article in Web of Science
Language
English
Original Abstract
We have merged the benefits of coarse-grained and nanocrystalline powders by the consolidation and sintering of coarse, yet nanostructured,mesoporous Y-TZP powder. The powder was composed of loosely aggregated, nanoscale crystallites, which can be seen as secondary particles oragglomerates. Their homogeneous, defect-free packing proved to be a viable pathway for the processing of zirconia nanoceramics. The powderconsolidation yielded homogeneous green bodies with hierarchical heterogeneities in terms of intra- and inter-particle pore packing. The hierarchicalheterogeneities had a pronounced effect on the densification and grain growth. The intra-particle pore coalescence along with a frozen inter-particle porosity, prolonged the pore-pinning effect, separating the densification and grain-growth mechanisms. Increased heating rates promoted thegrain growth and densification via a competitive mechanism of primary crystallite ordered coalescence, while by applying pressure, the crystallitegrowth was completely prevented, making such a coarse powder suitable for the fabrication of zirconia nanoceramics.
Keywords
Zirconia; Nanoceramic; Porosity; Sintering; Microstructure
Authors
KOCJAN, A.; POUCHLÝ, V.; SHEN, Z.
RIV year
2015
Released
1. 4. 2015
ISBN
0955-2219
Periodical
Journal of the European Ceramic Society
Year of study
35
Number
4
State
United Kingdom of Great Britain and Northern Ireland
Pages from
1285
Pages to
1295
Pages count
11
BibTex
@article{BUT111947, author="Andraž {Kocjan} and Václav {Pouchlý} and Zhijian {Shen}", title="Processing of zirconia nanoceramics from a coarse powder", journal="Journal of the European Ceramic Society", year="2015", volume="35", number="4", pages="1285--1295", doi="10.1016/j.jeurceramsoc.2014.10.022", issn="0955-2219" }