Processing of zirconia nanoceramics from a coarse powder
2015 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, Vol. 35, no 4, 1285-1295 p.Article in journal (Refereed) Published
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 or agglomerates. Their homogeneous, defect-free packing proved to be a viable pathway for the processing of zirconia nanoceramics. The powder consolidation yielded homogeneous green bodies with hierarchical heterogeneities in terms of intra- and inter-particle pore packing. The hierarchical heterogeneities had a pronounced effect on the densification and grain growth. The intra-particle pore coalescence along with a frozen interparticle porosity, prolonged the pore-pinning effect, separating the densification and grain-growth mechanisms. Increased heating rates promoted the grain-growth and densification via a competitive mechanism of primary crystallite ordered coalescence, while by applying pressure, the crystallite growth was completely prevented, making such a coarse powder suitable for the fabrication of zirconia nanoceramics.
Place, publisher, year, edition, pages
2015. Vol. 35, no 4, 1285-1295 p.
Zirconia, Nanoceramic, Porosity, Sintering, Microstructure
IdentifiersURN: urn:nbn:se:su:diva-114342DOI: 10.1016/j.jeurceramsoc.2014.10.022ISI: 000348084300016OAI: oai:DiVA.org:su-114342DiVA: diva2:793769